U.S. patent application number 14/104706 was filed with the patent office on 2014-04-10 for methods of treating a tauopathy.
This patent application is currently assigned to iPierian, Inc.. The applicant listed for this patent is iPierian, Inc.. Invention is credited to Vu Dang, Irene Griswold-Prenner, Nancy E. Stagliano.
Application Number | 20140099303 14/104706 |
Document ID | / |
Family ID | 50101612 |
Filed Date | 2014-04-10 |
United States Patent
Application |
20140099303 |
Kind Code |
A1 |
Griswold-Prenner; Irene ; et
al. |
April 10, 2014 |
Methods of Treating a Tauopathy
Abstract
The present disclosure provides methods of treating a tauopathy,
involving administering an anti-Tau antibody. The present
disclosure also provides anti-Tau antibodies, and formulations
comprising same, for use in the methods.
Inventors: |
Griswold-Prenner; Irene;
(South San Francisco, CA) ; Stagliano; Nancy E.;
(South San Francisco, CA) ; Dang; Vu; (South San
Francisco, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
iPierian, Inc. |
South San Francisco |
CA |
US |
|
|
Assignee: |
iPierian, Inc.
South San Francisco
CA
|
Family ID: |
50101612 |
Appl. No.: |
14/104706 |
Filed: |
December 12, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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PCT/US2013/055203 |
Aug 15, 2013 |
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14104706 |
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61833355 |
Jun 10, 2013 |
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61813797 |
Apr 19, 2013 |
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61781823 |
Mar 14, 2013 |
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61754085 |
Jan 18, 2013 |
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61683902 |
Aug 16, 2012 |
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Current U.S.
Class: |
424/133.1 |
Current CPC
Class: |
C07K 2317/565 20130101;
C07K 2317/34 20130101; G01N 2333/4709 20130101; A61P 25/28
20180101; A61K 2039/505 20130101; C07K 2317/567 20130101; C07K
2317/24 20130101; G01N 33/6896 20130101; G01N 2800/52 20130101;
C07K 2317/76 20130101; C07K 16/461 20130101; A61K 47/60 20170801;
C07K 16/18 20130101; C07K 2317/92 20130101; C07K 2319/10 20130101;
A61K 39/3955 20130101 |
Class at
Publication: |
424/133.1 |
International
Class: |
C07K 16/18 20060101
C07K016/18 |
Claims
1.-93. (canceled)
94. A method of treating a tauopathy in an individual, the method
comprising administering to the individual a pharmaceutical
composition comprising: a) a pharmaceutically acceptable excipient
suitable for administration to a human; and b) a humanized antibody
that specifically binds an epitope within an N-terminal portion of
a human Tau polypeptide, wherein the humanized antibody competes
for binding with an antibody that comprises: (i) a V.sub.L CDR1
comprising an amino acid sequence of SEQ ID NO:1; (ii) a V.sub.L
CDR2 comprising an amino acid sequence of SEQ ID NO:2; (iii) a
V.sub.L CDR3 comprising an amino acid sequence of SEQ ID NO:3; (iv)
a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID NO:4;
(v) a V.sub.H CDR2 comprising an amino acid sequence of SEQ ID
NO:5; and (vi) a V.sub.H CDR3 comprising an amino acid sequence of
SEQ ID NO:6 or (i) a V.sub.L CDR1 comprising an amino acid sequence
of SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino acid
sequence of SEQ ID NO:8; (iii) a V.sub.L CDR3 comprising an amino
acid sequence of SEQ ID NO:9; (iv) a V.sub.H CDR1 comprising an
amino acid sequence of SEQ ID NO:10; (v) a V.sub.H CDR2 comprising
an amino acid sequence of SEQ ID NO:11; and (vi) a V.sub.H CDR3
comprising an amino acid sequence of SEQ ID NO:12.
95. The method of claim 94, wherein the humanized antibody
comprises a humanized light chain framework region.
96. The method of claim 94, wherein the humanized antibody
comprises a humanized heavy chain framework region.
97. The method of claim 94, wherein the humanized antibody
comprises a humanized light chain framework region and a humanized
heavy chain framework region.
98. The method of claim 94, wherein the humanized antibody is a Fv,
scFv, Fab, F(ab')2, or Fab'.
99. The method of claim 94, wherein the humanized antibody
comprises a heavy chain region of the isotype IgG1, IgG2, IgG3, or
IgG4
100. The method of claim 94, wherein said administering is
intravenous.
101. The method of claim 94, wherein said administering is
intrathecal.
102. The method of claim 94, wherein said administering is
subcutaneous.
103. The method of claim 94, wherein the humanized antibody
comprises: (i) a V.sub.L CDR1 comprising an amino acid sequence of
SEQ ID NO:1; (ii) a V.sub.L CDR2 comprising an amino acid sequence
of SEQ ID NO:2; (iii) a V.sub.L CDR3 comprising an amino acid
sequence of SEQ ID NO:3; (iv) a V.sub.H CDR1 comprising an amino
acid sequence of SEQ ID NO:4; (v) a V.sub.H CDR2 comprising an
amino acid sequence of SEQ ID NO:5; and (vi) a V.sub.H CDR3
comprising an amino acid sequence of SEQ ID NO:6.
104. The method of claim 103, wherein the humanized antibody
comprises a humanized light chain framework region.
105. The method of claim 104, wherein the humanized light chain
framework region comprises an amino acid substitution depicted in
Table 3.
106. The method of claim 103, wherein the humanized antibody
comprises a humanized heavy chain framework region.
107. The method of claim 106, wherein the humanized heavy chain
framework region comprises an amino acid substitution depicted in
Table 2.
108. The method of claim 103, wherein the humanized antibody
comprises a humanized light chain framework region and a humanized
heavy chain framework region.
109. The method of claim 94, wherein the humanized antibody
comprises: (i) a V.sub.L CDR1 comprising an amino acid sequence of
SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino acid sequence
of SEQ ID NO:8; (iii) a V.sub.L CDR3 comprising an amino acid
sequence of SEQ ID NO:9; (iv) a V.sub.H CDR1 comprising an amino
acid sequence of SEQ ID NO:10; (v) a V.sub.H CDR2 comprising an
amino acid sequence of SEQ ID NO:11; and (vi) a V.sub.H CDR3
comprising an amino acid sequence of SEQ ID NO:12.
110. The method of claim 109, wherein the humanized antibody
comprises a humanized light chain framework region.
111. The method of claim 110, wherein the humanized light chain
framework region comprises an amino acid substitution depicted in
Table 3.
112. The method of claim 109, wherein the humanized antibody
comprises a humanized heavy chain framework region.
113. The method of claim 112, wherein the humanized heavy chain
framework region comprises an amino acid substitution depicted in
Table 2.
114. The method of claim 109, wherein the humanized antibody
comprises a humanized light chain framework region and a humanized
heavy chain framework region.
115. The method of claim 94, wherein the humanized antibody
comprises: a) a VH variant 1 comprising the amino acid sequence
depicted in FIG. 9 (SEQ ID NO:36) and a Vk variant 1 comprising the
amino acid sequence depicted in FIG. 13 (SEQ ID NO:40); b) a VH
variant 1 comprising the amino acid sequence depicted in FIG. 9
(SEQ ID NO:36); and a Vk variant 2 comprising the amino acid
sequence depicted in FIG. 14 (SEQ ID NO:41); c) a VH variant 1
comprising the amino acid sequence depicted in FIG. 9 (SEQ ID
NO:36); and a Vk variant 3 comprising the amino acid sequence
depicted in FIG. 15 (SEQ ID NO:42); d) a VH variant 1 comprising
the amino acid sequence depicted in FIG. 9 (SEQ ID NO:36); and a Vk
variant 4 comprising the amino acid sequence depicted in FIG. 16
(SEQ ID NO:43); e) a VH variant 2 comprising the amino acid
sequence depicted in FIG. 10 (SEQ ID NO:37); and a Vk variant 1
comprising the amino acid sequence depicted in FIG. 13 (SEQ ID
NO:40); f) a VH variant 2 comprising the amino acid sequence
depicted in FIG. 10 (SEQ ID NO:37); and a Vk variant 2 comprising
the amino acid sequence depicted in FIG. 14 (SEQ ID NO:41); g) a VH
variant 2 comprising the amino acid sequence depicted in FIG. 10
(SEQ ID NO:37); and a Vk variant 3 comprising the amino acid
sequence depicted in FIG. 15 (SEQ ID NO:42); h) a VH variant 2
comprising the amino acid sequence depicted in FIG. 10 (SEQ ID
NO:37); and a Vk variant 4 comprising the amino acid sequence
depicted in FIG. 16 (SEQ ID NO:43); i) a VH variant 3 comprising
the amino acid sequence depicted in FIG. 11 (SEQ ID NO:38); and a
Vk variant 1 comprising the amino acid sequence depicted in FIG. 13
(SEQ ID NO:40); j) a VH variant 3 comprising the amino acid
sequence depicted in FIG. 11 (SEQ ID NO:38); and a Vk variant 2
comprising the amino acid sequence depicted in FIG. 14 (SEQ ID
NO:41); k) a VH variant 3 comprising the amino acid sequence
depicted in FIG. 11 (SEQ ID NO:38); and a Vk variant 3 comprising
the amino acid sequence depicted in FIG. 15 (SEQ ID NO:42); l) a VH
variant 3 comprising the amino acid sequence depicted in FIG. 11
(SEQ ID NO:38); and a Vk variant 4 comprising the amino acid
sequence depicted in FIG. 16 (SEQ ID NO:43); m) a VH variant 4
comprising the amino acid sequence depicted in FIG. 12 (SEQ ID
NO:39); and a Vk variant 1 comprising the amino acid sequence
depicted in FIG. 13 (SEQ ID NO:40); n) a VH variant 4 comprising
the amino acid sequence depicted in FIG. 12 (SEQ ID NO:39); and a
Vk variant 2 comprising the amino acid sequence depicted in FIG. 14
(SEQ ID NO:41); o) a VH variant 4 comprising the amino acid
sequence depicted in FIG. 12 (SEQ ID NO:39); and a Vk variant 3
comprising the amino acid sequence depicted in FIG. 15 (SEQ ID
NO:42); or p) a VH variant 4 comprising the amino acid sequence
depicted in FIG. 12 (SEQ ID NO:39); and a Vk variant 4 comprising
the amino acid sequence depicted in FIG. 16 (SEQ ID NO:43).
116. The method of claim 94, wherein the humanized antibody
comprises: a) a light chain region comprising: (i) a VL CDR1
comprising an amino acid sequence of SEQ ID NO:1; (ii) a VL CDR2
comprising an amino acid sequence of SEQ ID NO:2; (iii) a VL CDR3
comprising an amino acid sequence of SEQ ID NO:3; and (iv) a
humanized light chain framework region; and b) a heavy chain region
comprising: (i) a VH CDR1 comprising an amino acid sequence of SEQ
ID NO:4; (ii) a VH CDR2 comprising an amino acid sequence of SEQ ID
NO:5; (iii) a VH CDR3 comprising an amino acid sequence of SEQ ID
NO:6; and (iv) a humanized heavy chain framework region.
117. The method of claim 116, wherein said administering is
intravenous.
118. The method of claim 116, wherein said administering is
intrathecal.
119. The method of claim 116, wherein said administering is
subcutaneous.
120. The method of claim 94, wherein the humanized antibody
comprises: a) a light chain region comprising: (i) a VL CDR1
comprising an amino acid sequence of SEQ ID NO:7; (ii) a VL CDR2
comprising an amino acid sequence of SEQ ID NO:8; (iii) a VL CDR3
comprising an amino acid sequence of SEQ ID NO:9; and (iv) a
humanized light chain framework region; and b) a heavy chain region
comprising: (i) a VH CDR1 comprising an amino acid sequence of SEQ
ID NO:10; (ii) a VH CDR2 comprising an amino acid sequence of SEQ
ID NO:11; (iii) a VH CDR3 comprising an amino acid sequence of SEQ
ID NO:12; and (iv) a humanized heavy chain framework region.
121. The method of claim 120, wherein said administering is
intravenous.
122. The method of claim 120, wherein said administering is
intrathecal.
123. The method of claim 120, wherein said administering is
subcutaneous.
Description
CROSS-REFERENCE
[0001] This application claims the benefit of U.S. Provisional
Patent Application Nos. 61/683,902, filed Aug. 16, 2012,
61/754,085, filed Jan. 18, 2013, 61/781,823, filed Mar. 14, 2013,
61/813,797, filed Apr. 19, 2013, and 61/833,355, filed Jun. 10,
2013, each of which applications is incorporated herein by
reference in its entirety.
INCORPORATION BY REFERENCE OF SEQUENCE LISTING PROVIDED AS A TEXT
FILE
[0002] A Sequence Listing is provided herewith as a text file,
"IPRN-745WO SeqList_ST25.txt" created on Aug. 15, 2013 and having a
size of 69 KB. The contents of the text file are incorporated by
reference herein in their entirety.
INTRODUCTION
[0003] The microtubule associated protein tau is abundant in the
central nervous system and is produced primarily by neurons. The
primary function of tau is to stabilize microtubules. Six tau
isoforms exist in the adult human brain; tau isoforms are the
products of alternative splicing of a single gene.
[0004] Tauopathies are a class of neurodegenerative diseases
resulting from the pathological aggregation of tau protein in
so-called neurofibrillary tangles (NFT) in the brain. Some examples
of tauopathies include frontotemporal dementia (FTD), Alzheimer's
disease, progressive supranuclear palsy, corticobasal degeneration,
and frontotemporal lobar degeneration.
[0005] There is a need in the art for methods of treating
tauopathies, and for reagents suitable for use in such methods.
SUMMARY
[0006] The present disclosure provides methods of treating a
tauopathy, involving administering an anti-Tau antibody. The
present disclosure also provides anti-Tau antibodies, and
formulations comprising same, for use in the methods.
Features
[0007] The present disclosure provides an isolated humanized
monoclonal antibody that specifically binds an epitope within amino
acids 15-24 of a Tau polypeptide. In some cases, the epitope does
not comprise a phosphorylated amino acid. In some cases, the
epitope does not comprise a nitrated amino acid. In some instances,
the epitope comprises a phosphorylated amino acid, a nitrated amino
acid, or both a phosphorylated amino acid and a nitrated amino
acid.
[0008] The present disclosure provides an isolated antibody
comprising a humanized light chain framework region; and a
humanized heavy chain framework region, wherein the isolated
antibody competes for binding to an epitope in an N-terminal region
of a Tau polypeptide with an antibody that comprises: a) a light
chain region comprising: i) a V.sub.L CDR1 comprising an amino acid
sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2
comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID NO:8;
and (iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ
ID NO:3 or SEQ ID NO:9; and b) a heavy chain region comprising: (i)
a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID NO:4 or
SEQ ID NO:10; (ii) a V.sub.H CDR2 comprising an amino acid sequence
of SEQ ID NO:5 or SEQ ID NO:11; and (iii) a V.sub.H CDR3 comprising
an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12. In some
cases, the light chain region and the heavy chain region are
present in separate polypeptides. In some cases, the light chain
region and the heavy chain region are present in a single
polypeptide. In some cases, the heavy chain region is of the
isotype IgG1, IgG2, IgG3, or IgG4. In some cases, the heavy chain
region is of the isotype IgG4. In some of these embodiments, the
hinge region comprises an S241P substitution. See, e.g., Angal et
al. (1993) Mol. Immunol. 30:105. In some cases, the antibody is a
Fv, scFv, Fab, F(ab')2, or Fab'. In some cases, the antibody
comprises a covalently linked non-peptide synthetic polymer, e.g.,
a poly(ethylene glycol) polymer. In some cases, the antibody is
fused, directly or via a linker, to a carrier molecule, a peptide
or a protein that promotes the crossing of the blood-brain barrier.
In some cases, the epitope is within amino acids 15-24 of a Tau
polypeptide. In some cases, the humanized light chain framework
region comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 of the amino acid
substitutions depicted in Table 3. In some instances, the humanized
heavy chain framework region comprises 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, or 12 of the amino acid substitutions depicted in Table
2.
[0009] The present disclosure provides an isolated antibody,
wherein the antibody is a Fv, scFv, Fab, F(ab')2, or Fab', and
wherein the antibody competes for binding to an epitope in an
N-terminal region of a Tau polypeptide with an antibody that
comprises: a) a light chain region comprising: i) a V.sub.L CDR1
comprising an amino acid sequence of SEQ ID NO:1 or SEQ ID NO:7;
(ii) a V.sub.L CDR2 comprising an amino acid sequence of SEQ ID
NO:2 or SEQ ID NO:8; and (iii) a V.sub.L CDR3 comprising an amino
acid sequence of SEQ ID NO:3 or SEQ ID NO:9; and b) a heavy chain
region comprising: (i) a V.sub.H CDR1 comprising an amino acid
sequence of SEQ ID NO:4 or SEQ ID NO:10; (ii) a V.sub.H CDR2
comprising an amino acid sequence of SEQ ID NO:5 or SEQ ID NO:11;
and (iii) a V.sub.H CDR3 comprising an amino acid sequence of SEQ
ID NO:6 or SEQ ID NO:12. In some cases, the isolated antibody
comprises a humanized light chain framework region. In some cases,
the humanized light chain framework region comprises 1, 2, 3, 4, 5,
6, 7, 8, 9, or 10 of the amino acid substitutions depicted in Table
3. In some cases, the isolated antibody comprises a humanized heavy
chain framework region. In some cases, the humanized heavy chain
framework region comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12
of the amino acid substitutions depicted in Table 2.
[0010] The present disclosure provides an isolated antibody,
wherein the isolated antibody comprises a human light chain
constant region and a human heavy chain constant region, and
wherein the isolated antibody competes for binding to an epitope in
an N-terminal region of a Tau polypeptide with an antibody that
comprises: a) a light chain region comprising: i) a V.sub.L CDR1
comprising an amino acid sequence of SEQ ID NO:1 or SEQ ID NO:7;
(ii) a V.sub.L CDR2 comprising an amino acid sequence of SEQ ID
NO:2 or SEQ ID NO:8; and (iii) a V.sub.L CDR3 comprising an amino
acid sequence of SEQ ID NO:3 or SEQ ID NO:9; and b) a heavy chain
region comprising: (i) a V.sub.H CDR1 comprising an amino acid
sequence of SEQ ID NO:4 or SEQ ID NO:10; (ii) a V.sub.H CDR2
comprising an amino acid sequence of SEQ ID NO:5 or SEQ ID NO:11;
and (iii) a V.sub.H CDR3 comprising an amino acid sequence of SEQ
ID NO:6 or SEQ ID NO:12.
[0011] The present disclosure provides a pharmaceutical formulation
comprising: a) an anti-Tau antibody of the present disclosure; and
b) a pharmaceutically acceptable excipient.
[0012] The present disclosure provides a pharmaceutical formulation
comprising: a) an antibody that specifically binds an epitope
within an N-terminal portion of Tau, wherein the antibody
comprises: (i) a V.sub.L CDR1 comprising an amino acid sequence of
SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino
acid sequence of SEQ ID NO:2 or SEQ ID NO:8; (iii) a V.sub.L CDR3
comprising an amino acid sequence of SEQ ID NO:3 or SEQ ID NO:9;
(iv) a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID
NO:4 or SEQ ID NO:10; (v) a V.sub.H CDR2 comprising an amino acid
sequence of SEQ ID NO:5 or SEQ ID NO:11; and (vi) a V.sub.H CDR3
comprising an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12;
and b) a pharmaceutically acceptable excipient suitable for
administration to a human, wherein the formulation is free of
endotoxins. In some cases, the antibody comprises a humanized light
chain framework region. In some cases, the humanized light chain
framework region comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 of the
amino acid substitutions depicted in Table 3. In some cases, the
antibody comprises a humanized heavy chain framework region. In
some cases, the humanized heavy chain framework region comprises 1,
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 of the amino acid
substitutions depicted in Table 2. In some cases, the antibody is
encapsulated in a liposome. In some cases, the antibody is
formulated with an agent that facilitates crossing the blood-brain
barrier. In some cases, the antibody is fused, directly or via a
linker, to a carrier molecule, a peptide or a protein that promotes
the crossing of the blood-brain barrier. In some cases, the
antibody is a Fv, scFv, Fab, F(ab')2, or Fab'.
[0013] The present disclosure provides a recombinant expression
vector comprising a nucleotide sequence encoding an anti-Tau
antibody of the present disclosure, wherein the nucleotide sequence
is operably linked to a transcriptional control element that is
active in a eukaryotic cell. The present disclosure provides an in
vitro host cell genetically modified with a recombinant expression
vector of the present disclosure.
[0014] The present disclosure provides a sterile container
comprising a pharmaceutical formulation of the present disclosure.
In some cases, the container is a syringe.
[0015] The present disclosure provides a method of treating a
tauopathy in an individual, the method comprising administering to
the individual an anti-Tau antibody of the present disclosure, or a
pharmaceutical composition of the present disclosure.
[0016] The present disclosure provides a method of treating a
tauopathy in an individual, the method comprising administering to
the individual a pharmaceutical composition comprising: a) an
antibody that competes for binding to an epitope in an N-terminal
region of a Tau polypeptide with an antibody that comprises: i)
light chain complementarity-determining regions (CDRs) of an
antibody depicted in FIG. 1B; and heavy chain CDRs of an antibody
depicted in FIG. 1A; or ii) light chain CDRs of an antibody
depicted in FIG. 2B; and heavy chain CDRs of an antibody depicted
in FIG. 2A; and b) a pharmaceutically acceptable excipient suitable
for administration to a human. In some cases, the antibody
comprises: (i) a V.sub.L CDR1 comprising an amino acid sequence of
SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino
acid sequence of SEQ ID NO:2 or SEQ ID NO:8; (iii) a V.sub.L CDR3
comprising an amino acid sequence of SEQ ID NO:3 or SEQ ID NO:9;
(iv) a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID
NO:4 or SEQ ID NO:10; (v) a V.sub.H CDR2 comprising an amino acid
sequence of SEQ ID NO:5 or SEQ ID NO:11; and (vi) a V.sub.H CDR3
comprising an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12.
In some cases, the antibody comprises a humanized light chain
framework region. In some cases, the antibody comprises a humanized
heavy chain framework region. In some cases, the antibody is
encapsulated in a liposome. In some cases, the antibody is
formulated with an agent that facilitates crossing the blood-brain
barrier. In some cases, the antibody is fused, directly or via a
linker, to a carrier molecule, a peptide or a protein that promotes
the crossing of the blood-brain barrier. In some cases, the
antibody is a Fv, scFv, Fab, F(ab')2, or Fab'. In some cases, the
administering is intravenous. In some cases, the administering is
intrathecal.
[0017] In some cases, administration of a subject anti-Tau antibody
results in a change in one or more of: a) the amount of free
extracellular tau in brain tissue; b) the amount of free
extracellular tau in interstitial fluid (ISF); c) the amount of
free extracellular tau in cerebrospinal fluid (CSF); d) the
neuron-to-neuron spread of tau; e) the amount of intraneuron tau
aggregates; f) the degree of microglial and/or astrocyte
activation; g) the amount of phosphorylated or hyperphosphorylated
tau; h) the amount of total Tau or free tau in ISF or CSF; i) the
amount of intracellular N-terminal tau fragments; j) neuronal
hyperactivity; k) the amount of A.beta.40 and/or A.beta.42 in CSF;
1) the A.beta. plaque burden; m) secretion of A.beta.40 and/or
A.beta.42 from a neuron; n) amyloid precursor protein (APP)
promoter activity; o) APP mRNA and/or protein level; p) the
activity of beta-secretase and/or gamma secretase; q) the
activation state of an A.beta. induced signaling pathway; r) the
amount of intracellular total tau or free tau; s) the amount of
anti-tau antibody-bound tau in ISF or CSF; and t) the amount of
intracellular anti-Tau antibody-bound tau.
[0018] In some cases, a method of the present disclosure for
treating a tauopathy in an individual further comprises
administering at least one additional agent that treats the
tauopathy.
[0019] The present disclosure provides a method of monitoring
progression of a tauopathy in an individual, the method comprising:
a) determining a first level of a Tau polypeptide in a biological
sample obtained from the individual at a first time point; b)
determining a second level of a Tau polypeptide in a biological
sample obtained from the individual at a second time point; and c)
comparing the second level of Tau with the first level of Tau,
wherein said determining comprises: i) contacting the biological
sample with an antibody of any one of claims 1, 5, 16, and 21; and
ii) quantitating binding of the antibody to Tau polypeptide present
in the sample. In some cases, the biological sample is
cerebrospinal fluid, blood, plasma, serum, urine, or saliva. In
some cases, the quantitated Tau polypeptide is total Tau
polypeptide. In some cases, the quantitated Tau polypeptide is an
N-terminal fragment of a full-length Tau polypeptide. In some
cases, the first time point is a time point before initiation of a
treatment regimen, and the second time point is a time point after
initiation of a treatment regimen.
[0020] The present disclosure provides a method of detecting a Tau
polypeptide in a living individual in vivo, the method comprising:
a) administering to the individual an antibody of any one of claims
1, 5, 16, and 21; and b) detecting binding of the antibody to tau
polypeptide in a brain tissue in the individual using an imaging
method. In some cases, the antibody comprises a contrast agent
suitable for use in the imaging method. In some cases, the imaging
method is magnetic resonance imaging or positron emission
tomography.
[0021] The present disclosure provides an in vitro method of
detecting a Tau polypeptide in a biological sample obtained from an
individual, the method comprising: a) contacting the biological
sample with an antibody competes for binding to an epitope within
the N-terminal region of Tau with an antibody that comprises: i)
light chain complementarity-determining regions (CDRs) of an
antibody depicted in FIG. 1B; and heavy chain CDRs of an antibody
depicted in FIG. 1A; or ii) light chain CDRs of an antibody
depicted in FIG. 2B; and heavy chain CDRs of an antibody depicted
in FIG. 2A; and b) detecting binding of the antibody to Tau
polypeptide present in the sample. In some cases, the biological
sample is blood, serum, plasma, urine, saliva, or cerebrospinal
fluid. In some cases, the individual is suspected of having a
tauopathy, has been diagnosed as having a tauopathy, or has a
genetic predisposition to developing a tauopathy. In some cases,
the method is quantitative. In some cases, the Tau polypeptide
detected is total Tau polypeptide. In some cases, the Tau
polypeptide detected is an N-terminal fragment of a full-length Tau
polypeptide.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIGS. 1A and 1B provide amino acid sequences of IPN001 VH
(FIG. 1A) and VL (FIG. 1B). Complementarity-determining regions
(CDRs) are in bold text and underlined.
[0023] FIGS. 2A and 2B provide amino acid sequences of IPN002 VH
(FIG. 2A) and VL (FIG. 2B). Complementarity-determining regions
(CDRs) are in bold text and underlined.
[0024] FIGS. 3A-D depicts the effect of anti-Tau antibody IPN002 on
Tau-mediated membrane depolarization in cortical neurons.
[0025] FIGS. 4A-C depict affinity isolation of Tau from
cerebrospinal fluid (CSF).
[0026] FIG. 5 depicts quantification of CSF and conditioned medium
(CM) samples pre- and post-Tau affinity isolation.
[0027] FIGS. 6A-D provide amino acid sequences of full-length human
Tau.
[0028] FIG. 7 depicts detection of Tau fragments in conditioned
medium, in interstitial fluid (ISF) from P301L tau mice, and in CSF
from PSP and AD patients
[0029] FIGS. 8A-D depict induction of cortical neuron hyperactivity
by an extracellular tau (eTau) fragment (FIGS. 8A-C); and reduction
of eTau-induced neuronal hyperactivity by anti-Tau antibody
IPN001.
[0030] FIG. 9 depicts an amino acid sequence of humanized IPN002 VH
variant 1; and a nucleotide sequence encoding the amino acid
sequence.
[0031] FIG. 10 depicts an amino acid sequence of humanized IPN002
VH variant 2; and a nucleotide sequence encoding the amino acid
sequence.
[0032] FIG. 11 depicts an amino acid sequence of humanized IPN002
VH variant 3; and a nucleotide sequence encoding the amino acid
sequence.
[0033] FIG. 12 depicts an amino acid sequence of humanized IPN002
VH variant 4; and a nucleotide sequence encoding the amino acid
sequence.
[0034] FIG. 13 depicts an amino acid sequence of humanized IPN002
V.kappa. variant 1; and a nucleotide sequence encoding the amino
acid sequence.
[0035] FIG. 14 depicts an amino acid sequence of humanized IPN002
V.kappa. variant 2; and a nucleotide sequence encoding the amino
acid sequence.
[0036] FIG. 15 depicts an amino acid sequence of humanized IPN002
V.kappa. variant 3; and a nucleotide sequence encoding the amino
acid sequence.
[0037] FIG. 16 depicts an amino acid sequence of humanized IPN002
V.kappa. variant 4; and a nucleotide sequence encoding the amino
acid sequence.
[0038] FIG. 17 provides Table 4, which shows binding properties of
humanized IPN-002 variants to eTau proteins.
[0039] FIG. 18 provides Table 5, which shows binding properties of
humanized IPN-002 variants to Tau-383.
[0040] FIGS. 19A and 19B depict properties of humanized IPN002
variants. FIG. 19A depicts binding of humanized IPN-002 variants to
tau present in iPSC-CN conditioned media; iPSC-CN lysates; AD brain
lysates; and P301L tau mouse brain cortex lysates; and cynomologus
monkey brain lysates. FIG. 19B depicts inhibition of eTau-induced
neuronal hyperactivity by humanized IPN002 variants.
[0041] FIG. 20 depicts amino acid sequences of eTau fragments, in
alignment with a fetal tau amino acid sequence.
[0042] FIGS. 21A-C depict proliferation responses to a humanized
anti-Tau antibody (FIG. 21A), a chimeric antibody (FIG. 21B), and
humanized A33 (FIG. 21C).
[0043] FIG. 22 depicts the effect of IPN002 on phosphorylated Tau
levels in vivo.
[0044] FIG. 23 depicts reduction in free tau levels and in total
tau levels in interstitial fluid (ISF) following treatment with
IPN002.
[0045] FIG. 24 depicts reduction in free tau levels in
cerebrospinal fluid (CSF) following treatment with IPN002.
[0046] FIG. 25 depicts reduction of eTau-induced neuronal
hyperactivity by IPN002.
[0047] FIG. 26 depicts the presence of Tau fragments in CSF from
individuals with likely chronic traumatic encephalopathy.
[0048] FIG. 27 depicts binding of a humanized variant of IPN002 to
synthetic tau peptides using a solid phase assay.
[0049] FIG. 28 depicts binding of a humanized variant of IPN002 to
synthetic tau peptides using a solution phase assay.
[0050] FIG. 29 depicts binding of a humanized variant of IPN002 to
recombinant Tau and to a PAD peptide.
[0051] FIG. 30 depicts competition of non-biotinylated forms of
synthetic tau peptides with biotinylated forms of synthetic tau
peptides for binding to a humanized variant of IPN002.
[0052] FIG. 31 depicts the effect of administration of control IgG,
PHF1, or IPN002 on clasping scores in the P310L mouse model.
[0053] FIG. 32 depicts the effect of administration of control IgG,
PHF1, or IPN002 on average latency in the beam walk test in the
P310L mouse model.
[0054] FIG. 33 depicts the effect of administration of control IgG,
PHF1, or IPN002 on the level of free tau (tau not bound to anti-tau
antibody) in CSF samples in the P310L mouse model.
[0055] FIG. 34 depicts antibody inhibition of eTau 1a-induced
neuronal hyperexcitability.
[0056] FIG. 35 depicts the effect of full-length, PHF1-reactive
tau, or eTau 1a, on neuronal hyperexcitability in cortical neurons
in vitro.
[0057] FIG. 36 depicts graphically the effect of full-length,
PHF1-reactive tau, or eTau 1a, on neuronal hyperexcitability in
cortical neurons in vitro.
[0058] FIG. 37 depicts the effect of control IgG, BACE inhibitor,
or IPN002 on levels of A.beta.40 (left panel) or A.beta.42 (right
panel) secreted from cortical neurons.
[0059] FIG. 38 depicts the effect of control IgG, BACE inhibitor,
or anti-Tau antibodies on levels of A.beta.40 secreted from primary
cortical neurons.
[0060] FIG. 39 depicts the effect of control IgG, BACE inhibitor,
or anti-Tau antibodies on levels of A.beta.42 secreted from primary
cortical neurons.
[0061] FIG. 40 depicts results of epitope mapping of a humanized
variant of IPN002 (hu-IPN002).
[0062] FIG. 41 depicts an assay for detecting various tau
polypeptides in CSF.
[0063] FIG. 42 depicts binding of Tau in CSF by IPN002, PHF1, or a
polyclonal antibody that binds a linear epitope in the C-terminal
portion of Tau (pAb-tau linear epitope).
[0064] FIG. 43 depicts the effect of treatment of P301L mice with
control IgG, PHF1, or IPN002 on the total tau levels in CSF.
[0065] FIGS. 44A-H depict the effect of treatment of P301L mice
with control IgG, PHF1, or IPN002 on AT8 phospho Tau in various
brain regions and tissues.
[0066] FIGS. 45A-E depict the effect of treatment of P301L mice
with control IgG, PHF1, or IPN002 on the levels of phosphorylated
Tau in various brain regions and tissues.
[0067] FIG. 46 depicts the effect of treatment of P301L mice with
control IgG, PHF1, or IPN002 on the level of AT8 phospho Tau
histology in the hindbrain.
[0068] FIG. 47 depicts the effect of treatment of P301L mice with
control IgG, PHF1, or IPN002 on the level of AT100 phospho Tau
histology in the hindbrain.
[0069] FIGS. 48A and 48B depict the effect of treatment of P301L
mice with control IgG, PHF1, or IPN002 on the level of GFAP protein
in hippocampal homogenate and in cortex homogenate.
[0070] FIGS. 49A and 49B depict the effect of treatment of P301L
mice with control IgG, PHF1, or IPN002 on the level of Iba1 protein
in hippocampal homogenate and in cortex homogenate.
[0071] FIGS. 50A and 50B depict the effect of treatment of P301L
mice with control IgG, PHF1, or IPN002 on the level of A.beta.40 in
cortex homogenate and cortex S1 fraction.
[0072] FIG. 51 depicts the effect of treatment of P301L mice with
control IgG, PHF1, or IPN002 on the percent of mice able to perform
in the beam walk test.
[0073] FIG. 52 depicts binding of hu-IPN002 to various Tau
peptides.
[0074] FIG. 53 depicts binding of various biotinylated Tau peptides
to hu-IPN002.
[0075] FIGS. 54A and 54B are schematic depictions of assays for Tau
not bound to IPN002 (Free Tau) (FIG. 54A); and Tau bound to IPN002
(Bound Tau) (FIG. 54B).
DEFINITIONS
[0076] The terms "antibodies" and "immunoglobulin" include
antibodies or immunoglobulins of any isotype, fragments of
antibodies which retain specific binding to antigen, including, but
not limited to, Fab, Fv, scFv, and Fd fragments, chimeric
antibodies, humanized antibodies, single-chain antibodies,
bi-specific antibodies, and fusion proteins comprising an
antigen-binding portion of an antibody and a non-antibody protein.
The antibodies may be detectably labeled, e.g., with a
radioisotope, an enzyme which generates a detectable product, a
fluorescent protein, and the like. The antibodies may be further
conjugated to other moieties, such as members of specific binding
pairs, e.g., biotin (member of biotin-avidin specific binding
pair), and the like. The antibodies may also be bound to a solid
support, including, but not limited to, polystyrene plates or
beads, and the like. Also encompassed by the term are Fab', Fv,
F(ab').sub.2, and or other antibody fragments that retain specific
binding to antigen, and monoclonal antibodies. An antibody may be
monovalent or bivalent.
[0077] The term "humanized immunoglobulin" as used herein refers to
an immunoglobulin comprising portions of immunoglobulins of
different origin, wherein at least one portion comprises amino acid
sequences of human origin. For example, the humanized antibody can
comprise portions derived from an immunoglobulin of nonhuman origin
with the requisite specificity, such as a mouse, and from
immunoglobulin sequences of human origin (e.g., chimeric
immunoglobulin), joined together chemically by conventional
techniques (e.g., synthetic) or prepared as a contiguous
polypeptide using genetic engineering techniques (e.g., DNA
encoding the protein portions of the chimeric antibody can be
expressed to produce a contiguous polypeptide chain). Another
example of a humanized immunoglobulin is an immunoglobulin
containing one or more immunoglobulin chains comprising a CDR
derived from an antibody of nonhuman origin and a framework region
derived from a light and/or heavy chain of human origin (e.g.,
CDR-grafted antibodies with or without framework changes). Chimeric
or CDR-grafted single chain antibodies are also encompassed by the
term humanized immunoglobulin. See, e.g., Cabilly et al., U.S. Pat.
No. 4,816,567; Cabilly et al., European Patent No. 0,125,023 B1;
Boss et al., U.S. Pat. No. 4,816,397; Boss et al., European Patent
No. 0,120,694 B1; Neuberger, M. S. et al., WO 86/01533; Neuberger,
M. S. et al., European Patent No. 0,194,276 B1; Winter, U.S. Pat.
No. 5,225,539; Winter, European Patent No. 0,239,400 B1; Padlan, E.
A. et al., European Patent Application No. 0,519,596 A1. See also,
Ladner et al., U.S. Pat. No. 4,946,778; Huston, U.S. Pat. No.
5,476,786; and Bird, R. E. et al., Science, 242: 423-426 (1988)),
regarding single chain antibodies.
[0078] For example, humanized immunoglobulins can be produced using
synthetic and/or recombinant nucleic acids to prepare genes (e.g.,
cDNA) encoding the desired humanized chain. For example, nucleic
acid (e.g., DNA) sequences coding for humanized variable regions
can be constructed using PCR mutagenesis methods to alter DNA
sequences encoding a human or humanized chain, such as a DNA
template from a previously humanized variable region (see e.g.,
Kamman, M., et al., Nucl. Acids Res., 17: 5404 (1989)); Sato, K.,
et al., Cancer Research, 53: 851-856 (1993); Daugherty, B. L. et
al., Nucleic Acids Res., 19(9): 2471-2476 (1991); and Lewis, A. P.
and J. S. Crowe, Gene, 101: 297-302 (1991)). Using these or other
suitable methods, variants can also be readily produced. For
example, cloned variable regions can be mutagenized, and sequences
encoding variants with the desired specificity can be selected
(e.g., from a phage library; see e.g., Krebber et al., U.S. Pat.
No. 5,514,548; Hoogenboom et al., WO 93/06213, published Apr. 1,
1993)).
[0079] "Antibody fragments" comprise a portion of an intact
antibody, for example, the antigen binding or variable region of
the intact antibody. Examples of antibody fragments include Fab,
Fab', F(ab').sub.2, and Fv fragments; diabodies; linear antibodies
(Zapata et al. Protein Eng. 8(10): 1057-1062 (1995)); single-chain
antibody molecules; and multispecific antibodies formed from
antibody fragments. Papain digestion of antibodies produces two
identical antigen-binding fragments, called "Fab" fragments, each
with a single antigen-binding site, and a residual "Fc" fragment, a
designation reflecting the ability to crystallize readily. Pepsin
treatment yields an F(ab').sub.2 fragment that has two antigen
combining sites and is still capable of cross-linking antigen. "Fv"
is the minimum antibody fragment which contains a complete
antigen-recognition and -binding site. This region consists of a
dimer of one heavy- and one light-chain variable domain in tight,
non-covalent association. It is in this configuration that the
three CDRS of each variable domain interact to define an
antigen-binding site on the surface of the V.sub.H-V.sub.L dimer.
Collectively, the six CDRs confer antigen-binding specificity to
the antibody. However, even a single variable domain (or half of an
Fv comprising only three CDRs specific for an antigen) has the
ability to recognize and bind antigen, although at a lower affinity
than the entire binding site.
[0080] The "Fab" fragment also contains the constant domain of the
light chain and the first constant domain (CH.sub.1) of the heavy
chain. Fab fragments differ from Fab' fragments by the addition of
a few residues at the carboxyl terminus of the heavy chain CH.sub.1
domain including one or more cysteines from the antibody hinge
region. Fab'-SH is the designation herein for Fab' in which the
cysteine residue(s) of the constant domains bear a free thiol
group. F(ab').sub.2 antibody fragments originally were produced as
pairs of Fab' fragments which have hinge cysteines between them.
Other chemical couplings of antibody fragments are also known.
[0081] The "light chains" of antibodies (immunoglobulins) from any
vertebrate species can be assigned to one of two clearly distinct
types, called kappa and lambda, based on the amino acid sequences
of their constant domains. Depending on the amino acid sequence of
the constant domain of their heavy chains, immunoglobulins can be
assigned to different classes. There are five major classes of
immunoglobulins: IgA, IgD, IgE, IgG, and IgM, and several of these
may be further divided into subclasses (isotypes), e.g., IgG1,
IgG2, IgG3, IgG4, IgA, and IgA2.
[0082] "Single-chain Fv" or "sFv" antibody fragments comprise the
V.sub.H and V.sub.L domains of antibody, wherein these domains are
present in a single polypeptide chain. In some embodiments, the Fv
polypeptide further comprises a polypeptide linker between the
V.sub.H and V.sub.L domains, which enables the sFv to form the
desired structure for antigen binding. For a review of sFv, see
Pluckthun in The Pharmacology of Monoclonal Antibodies, vol. 113,
Rosenburg and Moore eds., Springer-Verlag, New York, pp. 269-315
(1994).
[0083] The term "diabodies" refers to small antibody fragments with
two antigen-binding sites, which fragments comprise a heavy-chain
variable domain (V.sub.H) connected to a light-chain variable
domain (V.sub.L) in the same polypeptide chain (V.sub.H-V.sub.L).
By using a linker that is too short to allow pairing between the
two domains on the same chain, the domains are forced to pair with
the complementary domains of another chain and create two
antigen-binding sites. Diabodies are described more fully in, for
example, EP 404,097; WO 93/11161; and Hollinger et al. (1993) Proc.
Natl. Acad. Sci. USA 90:6444-6448.
[0084] As used herein, the term "affinity" refers to the
equilibrium constant for the reversible binding of two agents
(e.g., an antibody and an antigen) and is expressed as a
dissociation constant (Kd). Affinity can be at least 1-fold
greater, at least 2-fold greater, at least 3-fold greater, at least
4-fold greater, at least 5-fold greater, at least 6-fold greater,
at least 7-fold greater, at least 8-fold greater, at least 9-fold
greater, at least 10-fold greater, at least 20-fold greater, at
least 30-fold greater, at least 40-fold greater, at least 50-fold
greater, at least 60-fold greater, at least 70-fold greater, at
least 80-fold greater, at least 90-fold greater, at least 100-fold
greater, or at least 1000-fold greater, or more, than the affinity
of an antibody for unrelated amino acid sequences. Affinity of an
antibody to a target protein can be, for example, from about 100
nanomolar (nM) to about 0.1 nM, from about 100 nM to about 1
picomolar (pM), or from about 100 nM to about 1 femtomolar (fM) or
more. As used herein, the term "avidity" refers to the resistance
of a complex of two or more agents to dissociation after dilution.
The terms "immunoreactive" and "preferentially binds" are used
interchangeably herein with respect to antibodies and/or
antigen-binding fragments.
[0085] The term "binding" refers to a direct association between
two molecules, due to, for example, covalent, electrostatic,
hydrophobic, and ionic and/or hydrogen-bond interactions, including
interactions such as salt bridges and water bridges. A subject
anti-Tau antibody binds specifically to an epitope within a Tau
polypeptide. Non-specific binding would refer to binding with an
affinity of less than about 10.sup.-7 M, e.g., binding with an
affinity of 10.sup.-6 M, 10.sup.-5 M, 10.sup.-4 M, etc.
[0086] As used herein, the term "CDR" or "complementarity
determining region" is intended to mean the non-contiguous antigen
combining sites found within the variable region of both heavy and
light chain polypeptides. CDRs have been described by Kabat et al.,
J. Biol. Chem. 252:6609-6616 (1977); Kabat et al., U.S. Dept. of
Health and Human Services, "Sequences of proteins of immunological
interest" (1991); by Chothia et al., J. Mol. Biol. 196:901-917
(1987); and MacCallum et al., J. Mol. Biol. 262:732-745 (1996),
where the definitions include overlapping or subsets of amino acid
residues when compared against each other. Nevertheless,
application of either definition to refer to a CDR of an antibody
or grafted antibodies or variants thereof is intended to be within
the scope of the term as defined and used herein. The amino acid
residues which encompass the CDRs as defined by each of the above
cited references are set forth below in Table 1 as a
comparison.
TABLE-US-00001 TABLE 1 CDR Definitions Kabat.sup.1 Chothia.sup.2
MacCallum.sup.3 V.sub.H CDR1 31-35 26-32 30-35 V.sub.HCDR2 50-65
53-55 47-58 V.sub.H CDR3 95-102 96-101 93-101 V.sub.L CDR1 24-34
26-32 30-36 V.sub.L CDR2 50-56 50-52 46-55 V.sub.L CDR3 89-97 91-96
89-96 .sup.1Residue numbering follows the nomenclature of Kabat et
al., supra .sup.2Residue numbering follows the nomenclature of
Chothia et al., supra .sup.3Residue numbering follows the
nomenclature of MacCallum et al., supra
[0087] As used herein, the term "framework" when used in reference
to an antibody variable region is intended to mean all amino acid
residues outside the CDR regions within the variable region of an
antibody. A variable region framework is generally a discontinuous
amino acid sequence between about 100-120 amino acids in length but
is intended to reference only those amino acids outside of the
CDRs. As used herein, the term "framework region" is intended to
mean each domain of the framework that is separated by the
CDRs.
[0088] An "isolated" antibody is one that has been identified and
separated and/or recovered from a component of its natural
environment. Contaminant components of its natural environment are
materials that would interfere with diagnostic or therapeutic uses
for the antibody, and may include enzymes, hormones, and other
proteinaceous or nonproteinaceous solutes. In some embodiments, the
antibody will be purified (1) to greater than 90%, greater than
95%, or greater than 98%, by weight of antibody as determined by
the Lowry method, for example, more than 99% by weight, (2) to a
degree sufficient to obtain at least 15 residues of N-terminal or
internal amino acid sequence by use of a spinning cup sequenator,
or (3) to homogeneity by sodium dodecyl sulfate-polyacrylamide gel
electrophoresis (SDS-PAGE) under reducing or nonreducing conditions
using Coomassie blue or silver stain. Isolated antibody includes
the antibody in situ within recombinant cells since at least one
component of the antibody's natural environment will not be
present. In some instances, isolated antibody will be prepared by
at least one purification step.
[0089] The terms "polypeptide," "peptide," and "protein", used
interchangeably herein, refer to a polymeric form of amino acids of
any length, which can include genetically coded and non-genetically
coded amino acids, chemically or biochemically modified or
derivatized amino acids, and polypeptides having modified peptide
backbones. The term includes fusion proteins, including, but not
limited to, fusion proteins with a heterologous amino acid
sequence, fusions with heterologous and homologous leader
sequences, with or without N-terminal methionine residues;
immunologically tagged proteins; and the like.
[0090] As used herein, the terms "treatment," "treating," and the
like, refer to obtaining a desired pharmacologic and/or physiologic
effect. The effect may be prophylactic in terms of completely or
partially preventing a disease or symptom thereof and/or may be
therapeutic in terms of a partial or complete cure for a disease
and/or adverse effect attributable to the disease. "Treatment," as
used herein, covers any treatment of a disease in a mammal,
particularly in a human, and includes: (a) preventing the disease
from occurring in a subject which may be predisposed to the disease
but has not yet been diagnosed as having it; (b) inhibiting the
disease, i.e., arresting its development; and (c) relieving the
disease, i.e., causing regression of the disease.
[0091] The terms "individual," "subject," "host," and "patient,"
used interchangeably herein, refer to a mammal, including, but not
limited to, murines (rats, mice), non-human primates, humans,
canines, felines, ungulates (e.g., equines, bovines, ovines,
porcines, caprines), etc.
[0092] A "therapeutically effective amount" or "efficacious amount"
refers to the amount of an anti-Tau antibody that, when
administered to a mammal or other subject for treating a disease,
is sufficient to effect such treatment for the disease. The
"therapeutically effective amount" will vary depending on the
anti-Tau antibody, the disease and its severity and the age,
weight, etc., of the subject to be treated.
[0093] A "biological sample" encompasses a variety of sample types
obtained from an individual and can be used in a diagnostic or
monitoring assay. The definition encompasses blood and other liquid
samples of biological origin, solid tissue samples such as a biopsy
specimen or tissue cultures or cells derived therefrom and the
progeny thereof. The definition also includes samples that have
been manipulated in any way after their procurement, such as by
treatment with reagents, solubilization, or enrichment for certain
components, such as polynucleotides. The term "biological sample"
encompasses a clinical sample, and also includes cells in culture,
cell supernatants, cell lysates, serum, plasma, biological fluid,
and tissue samples. The term "biological sample" includes urine,
saliva, cerebrospinal fluid, blood fractions such as plasma and
serum, and the like.
[0094] Before the present invention is further described, it is to
be understood that this invention is not limited to particular
embodiments described, as such may, of course, vary. It is also to
be understood that the terminology used herein is for the purpose
of describing particular embodiments only, and is not intended to
be limiting, since the scope of the present invention will be
limited only by the appended claims.
[0095] Where a range of values is provided, it is understood that
each intervening value, to the tenth of the unit of the lower limit
unless the context clearly dictates otherwise, between the upper
and lower limit of that range and any other stated or intervening
value in that stated range, is encompassed within the invention.
The upper and lower limits of these smaller ranges may
independently be included in the smaller ranges, and are also
encompassed within the invention, subject to any specifically
excluded limit in the stated range. Where the stated range includes
one or both of the limits, ranges excluding either or both of those
included limits are also included in the invention.
[0096] Unless defined otherwise, all technical and scientific terms
used herein have the same meaning as commonly understood by one of
ordinary skill in the art to which this invention belongs. Although
any methods and materials similar or equivalent to those described
herein can also be used in the practice or testing of the present
invention, the preferred methods and materials are now described.
All publications mentioned herein are incorporated herein by
reference to disclose and describe the methods and/or materials in
connection with which the publications are cited.
[0097] It must be noted that as used herein and in the appended
claims, the singular forms "a," "an," and "the" include plural
referents unless the context clearly dictates otherwise. Thus, for
example, reference to "a humanized anti-Tau antibody" includes a
plurality of such antibodies and reference to "the tauopathy"
includes reference to one or more tauopathies and equivalents
thereof known to those skilled in the art, and so forth. It is
further noted that the claims may be drafted to exclude any
optional element. As such, this statement is intended to serve as
antecedent basis for use of such exclusive terminology as "solely,"
"only" and the like in connection with the recitation of claim
elements, or use of a "negative" limitation.
[0098] It is appreciated that certain features of the invention,
which are, for clarity, described in the context of separate
embodiments, may also be provided in combination in a single
embodiment. Conversely, various features of the invention, which
are, for brevity, described in the context of a single embodiment,
may also be provided separately or in any suitable sub-combination.
All combinations of the embodiments pertaining to the invention are
specifically embraced by the present invention and are disclosed
herein just as if each and every combination was individually and
explicitly disclosed. In addition, all sub-combinations of the
various embodiments and elements thereof are also specifically
embraced by the present invention and are disclosed herein just as
if each and every such sub-combination was individually and
explicitly disclosed herein.
[0099] The publications discussed herein are provided solely for
their disclosure prior to the filing date of the present
application. Nothing herein is to be construed as an admission that
the present invention is not entitled to antedate such publication
by virtue of prior invention. Further, the dates of publication
provided may be different from the actual publication dates which
may need to be independently confirmed.
DETAILED DESCRIPTION
[0100] The present disclosure provides methods of treating a
tauopathy, involving administering an anti-Tau antibody. The
present disclosure also provides anti-Tau antibodies, and
formulations comprising same, for use in the methods. The present
disclosure further provides in vitro and in vivo detection methods
using an anti-Tau antibody described herein.
Methods of Treating a Tauopathy
[0101] The present disclosure provides methods of treating a
tauopathy. The methods generally involve administering an effective
amount of an anti-Tau antibody of the present disclosure to an
individual in need thereof. In some cases, administration of a
subject anti-tau antibody reduces the level of a pathological tau
polypeptide in a cell, a tissue, or a fluid of an individual, and
treats the tauopathy.
[0102] For example, in some embodiments, a subject method can
comprise administering to an individual in need thereof an
effective amount of an isolated humanized monoclonal antibody that
specifically binds an epitope within amino acids 15-24 of a Tau
polypeptide. In some embodiments, the antibody is present in a
pharmaceutical formulation with a pharmaceutically acceptable
excipient, e.g., a pharmaceutically acceptable excipient that is
suitable for administration to a human.
[0103] For example, in some embodiments, a subject method can
comprise administering to an individual in need thereof an
effective amount of an isolated antibody comprising a humanized
light chain framework region; and a humanized heavy chain framework
region, wherein the isolated antibody competes for binding to an
epitope in an N-terminal region of a Tau polypeptide with an
antibody that comprises: a) a light chain region comprising: i) a
V.sub.L CDR1 comprising an amino acid sequence of SEQ ID NO:1 or
SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino acid sequence
of SEQ ID NO:2 or SEQ ID NO:8; and (iii) a V.sub.L CDR3 comprising
an amino acid sequence of SEQ ID NO:3 or SEQ ID NO:9; and b) a
heavy chain region comprising: (i) a V.sub.H CDR1 comprising an
amino acid sequence of SEQ ID NO:4 or SEQ ID NO:10; (ii) a V.sub.H
CDR2 comprising an amino acid sequence of SEQ ID NO:5 or SEQ ID
NO:11; and (iii) a V.sub.H CDR3 comprising an amino acid sequence
of SEQ ID NO:6 or SEQ ID NO:12. In some embodiments, the antibody
is present in a pharmaceutical formulation with a pharmaceutically
acceptable excipient, e.g., a pharmaceutically acceptable excipient
that is suitable for administration to a human.
[0104] For example, in some embodiments, a subject method can
comprise administering to an individual in need thereof an
effective amount of an isolated antibody, wherein the antibody is a
Fv, scFv, Fab, F(ab')2, or Fab', and wherein the antibody competes
for binding to an epitope in an N-terminal region of a Tau
polypeptide with an antibody that comprises: a) a light chain
region comprising: i) a V.sub.L CDR1 comprising an amino acid
sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2
comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID NO:8;
and (iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ
ID NO:3 or SEQ ID NO:9; and b) a heavy chain region comprising: (i)
a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID NO:4 or
SEQ ID NO:10; (ii) a V.sub.H CDR2 comprising an amino acid sequence
of SEQ ID NO:5 or SEQ ID NO:11; and (iii) a V.sub.H CDR3 comprising
an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12. In some
embodiments, the antibody is present in a pharmaceutical
formulation with a pharmaceutically acceptable excipient, e.g., a
pharmaceutically acceptable excipient that is suitable for
administration to a human.
[0105] For example, in some embodiments, a subject method can
comprise administering to an individual in need thereof an
effective amount of an isolated antibody, wherein the isolated
antibody comprises a human light chain constant region and a human
heavy chain constant region, and wherein the isolated antibody
competes for binding to an epitope in an N-terminal region of a Tau
polypeptide with an antibody that comprises: a) a light chain
region comprising: i) a V.sub.L CDR1 comprising an amino acid
sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2
comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID NO:8;
and (iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ
ID NO:3 or SEQ ID NO:9; and b) a heavy chain region comprising: (i)
a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID NO:4 or
SEQ ID NO:10; (ii) a V.sub.H CDR2 comprising an amino acid sequence
of SEQ ID NO:5 or SEQ ID NO:11; and (iii) a V.sub.H CDR3 comprising
an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12. In some
embodiments, the antibody is present in a pharmaceutical
formulation with a pharmaceutically acceptable excipient, e.g., a
pharmaceutically acceptable excipient that is suitable for
administration to a human.
[0106] An anti-Tau antibody of the present disclosure binds
extracellular tau. "Extracellular tau" ("eTau"), as used herein,
encompasses any Tau polypeptide that can be detected in
cerebrospinal fluid (CSF) or interstitial fluid (ISF). In some
embodiments, eTau is a polypeptide having a length of 175 amino
acids and comprising amino acids 2-176 of full-length tau; for
example, in some embodiments eTau is a polypeptide comprising the
amino acid sequence set forth in SEQ ID NO:45. In some embodiments,
eTau is a polypeptide having a length of 171 amino acids and
comprising amino acids 2-172 (SEQ ID NO:44) of full-length tau; for
example, in some embodiments eTau is a polypeptide comprising the
amino acid sequence set forth in SEQ ID NO:44. In some embodiments,
eTau is an eTau-2 polypeptide comprising the amino acid sequence
set forth in SEQ ID NO:46. In some embodiments, eTau is an eTau-3
polypeptide comprising the amino acid sequence set forth in SEQ ID
NO:47. In some embodiments, eTau is an eTau-4 polypeptide
comprising the amino acid sequence set forth in SEQ ID NO:48.
[0107] In some cases, an eTau polypeptide has a length of from
about 50 amino acids to about 175 amino acids, e.g., from about 50
amino acids (aa) to about 75 aa, from about 75 aa to about 100 aa,
from about 100 aa to about 125 aa, from about 125 aa to about 150
aa, or from about 150 aa to about 175 aa; and can comprise from 50
to about 75, from about 75 to about 100, from about 100 to about
125, from about 125 to about 150, or from about 150 to about 175,
contiguous amino acids of amino acids 2-176 of full-length tau.
Exemplary eTau polypeptides are depicted in FIG. 20.
[0108] As described in more detail below, an anti-Tau antibody of
the present disclosure specifically binds Tau, where the epitope
bound by the antibody is a linear epitope, and comprises amino acid
residues within an amino-terminal (N-terminal) portion of Tau,
e.g., within amino acids 1-25 of Tau, within amino acids 1-18 of
Tau, within amino acids 9 to 18 of Tau, within amino acids 13-24 of
Tau, within amino acids 15-44 of Tau, or within amino acids 15-24
of Tau. Amino acid sequences of human Tau isoforms are depicted in
FIGS. 6A-D. Amino acids 1-18 of Tau are: MAEPRQEFEVMEDHAGTY; SEQ ID
NO:53). See, e.g., Garcia-Sierra et al. (2003) J. Alzheimer's
Disease 5:65; and Horowitz et al. (2004) J. Neurosci. 24:7895.
Amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51).
[0109] In some embodiments, an anti-Tau antibody of the present
disclosure specifically binds Tau, where the epitope bound by the
antibody is a linear epitope, and comprises amino acid residues
within amino acids 1-25 of Tau, within amino acids 13-24 of Tau, or
within amino acids 15-24 of Tau. In some cases, a humanized
anti-Tau antibody of the present disclosure specifically binds a
linear epitope comprising amino acid residues within amino acids
1-25 of Tau, within amino acids 13-24 of Tau, or within amino acids
15-24 of Tau, where the epitope does not include a phosphorylated
amino acid. In some cases, a humanized anti-Tau antibody of the
present disclosure specifically binds a linear epitope comprising
amino acid residues within amino acids 1-25 of Tau, within amino
acids 13-24 of Tau, or within amino acids 15-24 of Tau, where the
epitope includes a phosphorylated amino acid. In some cases, a
humanized anti-Tau antibody of the present disclosure specifically
binds a linear epitope comprising amino acid residues within amino
acids 1-25 of Tau, within amino acids 13-24 of Tau, or within amino
acids 15-24 of Tau, where the epitope does not include a nitrated
amino acid. In some cases, a humanized anti-Tau antibody of the
present disclosure specifically binds a linear epitope comprising
amino acid residues within amino acids 1-25 of Tau, within amino
acids 13-24 of Tau, or within amino acids 15-24 of Tau, where the
epitope includes a nitrated amino acid. In some cases, a humanized
anti-Tau antibody of the present disclosure specifically binds a
linear epitope comprising amino acid residues within amino acids
1-25 of Tau, within amino acids 13-24 of Tau, or within amino acids
15-24 of Tau, where the epitope includes a nitrated amino acid, and
does not include a phosphorylated amino acid. In some cases, a
humanized anti-Tau antibody of the present disclosure specifically
binds a linear epitope comprising amino acid residues within amino
acids 1-25 of Tau, within amino acids 13-24 of Tau, or within amino
acids 15-24 of Tau, where the epitope includes a phosphorylated
amino acid and does not include a nitrated amino acid. In some
cases, a humanized anti-Tau antibody of the present disclosure
specifically binds a linear epitope comprising amino acid residues
within amino acids 1-25 of Tau, within amino acids 13-24 of Tau, or
within amino acids 15-24 of Tau, where the epitope includes a
nitrated amino acid and a phosphorylated amino acid.
[0110] For example, in some embodiments, an anti-Tau antibody of
the present disclosure specifically binds a linear epitope
comprising amino acid residues within amino acids AGTYGLGDRK (SEQ
ID NO:51) of Tau. In some embodiments, a humanized anti-Tau
antibody of the present disclosure specifically binds a linear
epitope comprising amino acid residues within amino acids
AGTYGLGDRK (SEQ ID NO:51) of Tau.
[0111] In some cases, a humanized anti-Tau antibody of the present
disclosure specifically binds a linear epitope comprising amino
acid residues within amino acids AGTYGLGDRK (SEQ ID NO:51) of Tau,
where the epitope does not include a phosphorylated amino acid. In
some cases, a humanized anti-Tau antibody of the present disclosure
specifically binds a linear epitope comprising amino acid residues
within amino acids AGTYGLGDRK (SEQ ID NO:51) of Tau, where the
epitope includes a phosphorylated amino acid. In some cases, a
humanized anti-Tau antibody of the present disclosure specifically
binds a linear epitope comprising amino acid residues within amino
acids AGTYGLGDRK (SEQ ID NO:51) of Tau, where the epitope does not
include a nitrated amino acid. In some cases, a humanized anti-Tau
antibody of the present disclosure specifically binds a linear
epitope comprising amino acid residues within amino acids
AGTYGLGDRK (SEQ ID NO:51) of Tau, where the epitope includes a
nitrated amino acid. In some cases, a humanized anti-Tau antibody
of the present disclosure specifically binds a linear epitope
comprising amino acid residues within amino acids AGTYGLGDRK (SEQ
ID NO:51) of Tau, where the epitope includes a nitrated amino acid,
and does not include a phosphorylated amino acid. In some cases, a
humanized anti-Tau antibody of the present disclosure specifically
binds a linear epitope comprising amino acid residues within amino
acids AGTYGLGDRK (SEQ ID NO:51) of Tau, where the epitope includes
a phosphorylated amino acid and does not include a nitrated amino
acid. In some cases, a humanized anti-Tau antibody of the present
disclosure specifically binds a linear epitope comprising amino
acid residues within amino acids AGTYGLGDRK (SEQ ID NO:51) of Tau,
where the epitope includes a nitrated amino acid and a
phosphorylated amino acid.
[0112] In some cases, a method of the present disclosure for
treating a tauopathy comprises administering to an individual in
need thereof a pharmaceutical composition comprising: a) an
anti-Tau antibody comprising: i) one, two, or three light chain
complementarity-determining regions (CDRs) of an antibody depicted
in FIG. 1; and one, two, or three heavy chain CDRs of an antibody
depicted in FIG. 1; or ii) one, two, or three light chain CDRs of
an antibody depicted in FIG. 2; and one, two, or three heavy chain
CDRs of an antibody depicted in FIG. 2; and b) a pharmaceutically
acceptable excipient suitable for administration to a human.
[0113] In some cases, a method of the present disclosure for
treating a tauopathy comprises administering to an individual in
need thereof a pharmaceutical composition comprising: a) an
antibody that specifically binds an epitope within a human Tau
polypeptide, where the antibody competes for binding to the epitope
with an antibody that comprises: i) light chain
complementarity-determining regions (CDRs) of an antibody depicted
in FIG. 1B; and heavy chain CDRs of an antibody depicted in FIG.
1A; or ii) light chain CDRs of an antibody depicted in FIG. 2B; and
heavy chain CDRs of an antibody depicted in FIG. 2A; and b) a
pharmaceutically acceptable excipient suitable for administration
to a human.
[0114] In some cases, a method of the present disclosure for
treating a tauopathy comprises administering to an individual in
need thereof a pharmaceutical composition comprising: a) an
antibody that competes for binding with humanized IPN002
(hu-IPN002) to an epitope in Tau that is recognized by hu-IPN002
(e.g., a linear epitope within an N-terminal portion of Tau, e.g.,
within amino acids 1-25 of Tau, within amino acids 1-18 of Tau,
within amino acids 9 to 18 of Tau, within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of
Tau); and b) a pharmaceutically acceptable excipient suitable for
administration to a human.
[0115] IPN001 (also referred to herein as "IPN1" or "IPN-1") and
IPN002 (also referred to herein as "IPN2" or "IPN-2") specifically
bind Tau. The epitope bound by IPN001 is a linear epitope, and
comprises amino acid residues within an amino-terminal (N-terminal)
portion of Tau, e.g., within amino acids 1-25 of Tau.
[0116] In some instances, an anti-Tau antibody of the present
disclosure that is suitable for use in a method of treating a
tauopathy comprises: a) a light chain variable region comprising:
i) one, two, or three V.sub.L CDRs of an IPN001 antibody; and ii) a
humanized light chain framework region; and b) a heavy chain
variable region comprising: i) one, two, or three V.sub.H CDRs of
an IPN001 antibody; and ii) a humanized heavy chain framework
region; where the V.sub.H and V.sub.L CDRs are as defined by Kabat
(see, e.g., Table 1, above; and Kabat et al., U.S. Dept. of Health
and Human Services, "Sequences of proteins of immunological
interest" (1991)).
[0117] In some instances, an anti-Tau antibody of the present
disclosure that is suitable for use in a method of treating a
tauopathy comprises: a) a light chain region comprising: i) one,
two, or three V.sub.L CDRs of an IPN001 antibody; and ii) a
humanized light chain framework region; and b) a heavy chain region
comprising: i) one, two, or three V.sub.H CDRs of an IPN001
antibody; and ii) a humanized heavy chain framework region; where
the V.sub.H and V.sub.L CDRs are as defined by Chothia (see, e.g.,
Table 1, above; and Chothia et al., J. Mol. Biol. 196:901-917
(1987)).
[0118] In other instances, an anti-Tau antibody of the present
disclosure that is suitable for use in a method of treating a
tauopathy comprises: a) a light chain region comprising: i) one,
two, or three V.sub.L CDRs of an IPN002 antibody; and ii) a
humanized light chain framework region; and b) a heavy chain region
comprising: i) one, two, or three V.sub.H CDRs of an IPN002
antibody; and ii) a humanized heavy chain framework region; where
the V.sub.H and V.sub.L CDRs are as defined by Kabat (see, e.g.,
Table 1, above; and Kabat et al., U.S. Dept. of Health and Human
Services, "Sequences of proteins of immunological interest"
(1991)).
[0119] In other instances, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, where the epitope is within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau, within amino acids 15-44 of Tau, within amino
acids 13-24 of Tau, or within amino acids 15-24 of Tau) comprises:
a) a light chain region comprising: i) one, two, or three V.sub.L
CDRs of an IPN002 antibody; and ii) a humanized light chain
framework region; and b) a heavy chain region comprising: i) one,
two, or three V.sub.H CDRs of an IPN002 antibody; and ii) a
humanized heavy chain framework region; where the V.sub.H and
V.sub.L CDRs are as defined by Chothia (see, e.g., Table 1, above;
and Chothia et al., J. Mol. Biol. 196:901-917 (1987)).
[0120] In some cases, a method of the present disclosure for
treating a tauopathy comprises administering to an individual in
need thereof an effective amount of a pharmaceutical composition
comprising: a) an antibody that specifically binds a linear epitope
within an amino-terminal (N-terminal) portion of Tau, e.g., within
amino acids 1-25 of Tau, within amino acids 1-18 of Tau, within
amino acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51)),
where the antibody comprises: (i) a V.sub.L CDR1 comprising an
amino acid sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L
CDR2 comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID
NO:8; (iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ
ID NO:3 or SEQ ID NO:9; (iv) a V.sub.H CDR1 comprising an amino
acid sequence of SEQ ID NO:4 or SEQ ID NO:10; (v) a V.sub.H CDR2
comprising an amino acid sequence of SEQ ID NO:5 or SEQ ID NO:11;
and (vi) a V.sub.H CDR3 comprising an amino acid sequence of SEQ ID
NO:6 or SEQ ID NO:12; and b) a pharmaceutically acceptable
excipient suitable for administration to a human.
[0121] V.sub.H and V.sub.L amino acid sequences of IPN001 are
depicted in FIGS. 1A and 1B. CDRs (as defined by Kabat) are in bold
text and underlined. V.sub.H and V.sub.L amino acid sequences of
IPN002 are depicted in FIGS. 2A and 2B. CDRs (as defined by Kabat)
are in bold text and underlined.
[0122] SEQ ID NOs:1-12 are as follows:
TABLE-US-00002 RSSQTILHSNGNTYLE; (SEQ ID NO: 1) KVSKRFS; (SEQ ID
NO: 2) FQGSLVPWA; (SEQ ID NO: 3) SYGMS; (SEQ ID NO: 4)
TISSSGSRTYFPDSVKG; (SEQ ID NO: 5) TWDGAMDY; (SEQ ID NO: 6)
KSSQSIVHSNGNTYLE; (SEQ ID NO: 7) KVSNRFS; (SEQ ID NO: 8) FQGSLVPWA;
(SEQ ID NO: 9) KYGMS; (SEQ ID NO: 10) TISSSGSRTYYPDSVKG; (SEQ ID
NO: 11) SWDGAMDY. (SEQ ID NO: 12)
[0123] In some cases, the antibody comprises a humanized light
chain framework region and/or a humanized heavy chain framework
region. Humanized anti-Tau antibodies are described in detail
below.
[0124] A tauopathy is a disorder characterized by an abnormal level
of tau in a cell, a tissue, or a fluid in an individual. In some
cases, a tauopathy is characterized by the presence in a cell, a
tissue, or a fluid of elevated (higher than normal) levels of tau
or tau polypeptides and/or pathological forms of tau. For example,
in some cases, a tauopathy is characterized by the presence in
brain tissue and/or cerebrospinal fluid of elevated levels of tau
or tau polypeptides and/or pathological forms of tau. A "higher
than normal" level of tau in a cell, a tissue, or a fluid indicates
that the level of tau in the tissue or fluid is higher than a
normal, control level, e.g., higher than a normal, control level
for an individual or population of individuals of the same age
group. See, e.g., Blomberg et al. (2001) "Cerebrospinal fluid tau
levels increase with age in healthy individuals" Dement. Geriatr.
Cogn. Disord. 12:127. In some cases, an individual having a
tauopathy exhibits one or more additional symptoms of a tauopathy
(e.g., cognitive decline).
[0125] In other cases, a tauopathy is characterized by the presence
in a cell, a tissue, or a fluid of lower than normal levels of tau.
A "lower than normal" level of tau in a tissue or a fluid indicates
that the level of tau in the cell, tissue, or fluid is lower than a
normal, control level, e.g., lower than a normal, control level for
an individual or population of individuals of the same age
group.
[0126] Alzheimer's disease and certain forms of Frontotemporal
dementia (Pick's disease, sporadic Frontotemporal dementia and
Frontotemporal dementia with Parkinsonism linked to chromosome 17)
are the most common forms of tauopathy. The present disclosure
provides a treatment method as described above, wherein the
tauopathy is Alzheimer's, Pick's disease, sporadic Frontotemporal
dementia and Frontotemporal dementia with Parkinsonism linked to
chromosome 17. Other tauopathies include, but are not limited to,
Progressive supranuclear palsy (PSP), Corticobasal degeneration
(CBD) and Subacute sclerosing panencephalitis.
[0127] A neurodegenerative tauopathy includes Alzheimer's disease,
amyotrophic lateral sclerosis/parkinsonism-dementia complex,
argyrophilic grain dementia, British type amyloid angiopathy,
cerebral amyloid angiopathy, corticobasal degeneration,
Creutzfeldt-Jakob disease, dementia pugilistica, diffuse
neurofibrillary tangles with calcification, Down's syndrome,
frontotemporal dementia (FTD), frontotemporal dementia with
parkinsonism linked to chromosome 17, frontotemporal lobar
degeneration, Gerstmann-Straussler-Scheinker disease,
Hallervorden-Spatz disease, inclusion body myositis, multiple
system atrophy, myotonic dystrophy, Niemann-Pick disease type C,
non-Guamanian motor neuron disease with neurofibrillary tangles,
Pick's disease, postencephalitic parkinsonism, prion protein
cerebral amyloid angiopathy, progressive subcortical gliosis,
progressive supranuclear palsy, subacute sclerosing
panencephalitis, Tangle only dementia, multi-infarct dementia,
ischemic stroke, chronic traumatic encephalopathy (CTE), traumatic
brain injury (TBI), and stroke.
[0128] The present disclosure also provides methods of treating a
synucleinopathy, e.g., Parkinson's disease (PD); dementia with Lewy
Bodies (DLB); multiple system atrophy (MSA); etc. For example, PD
with dementia (PDD) can be treated with a subject method.
[0129] In one embodiment, an anti-tau antibody of the present
disclosure prevents or delays the onset of at least one symptom of
a neurodegenerative tauopathy in a subject. In one embodiment, a
subject anti-tau antibody reduces or eliminates at least one
symptom of a neurodegenerative tauopathy in a subject. The symptom
may be the formation of one or more of pathological tau deposits;
extracellular soluble Tau and/or Tau fragments; hyperphosphorylated
tau deposits; insoluble tau deposits; neurofibrillary tangles;
neurofibrillary fibers; pre-tangle phospho-tau aggregates;
intraneuronal neurofibrillary tangles; neuronal hyperactivity; and
extraneuronal neurofibrillary tangles in the brain or spinal cord
of a subject. The symptom may be a neurological symptom, for
example, impaired cognitive function, memory impairment, loss of
motor function, etc. In some cases, an anti-tau antibody of the
present disclosure can improve cognitive function. In some cases,
an anti-tau antibody of the present disclosure can reduce the rate
of decline in cognitive function. In some cases, an anti-tau
antibody of the present disclosure can improve motor function. In
some cases, an anti-tau antibody of the present disclosure can
reduce the rate of decline in motor function.
[0130] The symptom can also be the level of a Tau polypeptide in
the CSF of the individual. For example, in some embodiments, a
subject anti-tau antibody, when administered in one or more doses
as monotherapy or in combination therapy to an individual having a
tauopathy, reduces the level of a Tau polypeptide in the CSF of the
individual by at least about 10%, at least about 15%, at least
about 20%, at least about 25%, at least about 30%, at least about
40%, at least about 50%, or more than 50%, compared to the level of
the Tau polypeptide in the CSF of the individual before treatment
with the anti-tau antibody.
[0131] Administration of a subject anti-tau antibody to an
individual can result in one or more of: reduction in the amount of
free extracellular Tau in brain tissue; reduction in the
cell-to-cell spread (e.g., neuron-to-neuron spread) of Tau (e.g.,
Tau fragments); reduction in the amount of tau aggregates (e.g.,
intracellular (e.g., intraneuronal) tau aggregates); reduction in
the amount of neurofibrillary tangles in brain tissue; reduction in
the level of microglial activation and/or astrocyte activation;
reduction in the amount of phosphorylated tau; reduction in the
amount of hyperphosphorylated tau; reduction in total Tau (e.g.,
total intracellular Tau; and/or total extracellular Tau); reduction
in free Tau (e.g., Tau that is not bound to a subject anti-Tau
antibody); reduction in neuronal hyperactivity; and reduction in
the amount of N-terminal Tau fragments. "Total Tau" can include the
sum total of full-length Tau of any isoform; and any N-terminal Tau
fragments that are present and that display the epitope recognized
by a subject anti-Tau antibody. Amino acid sequences of human
full-length Tau are presented in FIGS. 6A-D. Reduction in
phosphorylated Tau can be determined using any known method, e.g.,
an immunological method using an anti-phospho-Tau antibody.
[0132] Administration of a subject anti-tau antibody to an
individual can result in a change in one or more of: a) the amount
of free extracellular tau in brain tissue; b) the amount of free
extracellular tau in interstitial fluid (ISF); c) the amount of
free extracellular tau in cerebrospinal fluid (CSF); d) the
neuron-to-neuron spread of tau; e) the amount of intraneuron tau
aggregates; f) the degree of microglial and/or astrocyte
activation; g) the amount of phosphorylated or hyperphosphorylated
tau; h) the amount of total Tau or free tau in ISF or CSF; i) the
amount of intracellular N-terminal tau fragments; j) neuronal
hyperactivity; k) the amount of A.beta.40 and/or A.beta.42 in CSF;
1) the A.beta. plaque burden; m) secretion of A.beta.40 and/or
A.beta.42 from a neuron; n) amyloid precursor protein (APP)
promoter activity; o) APP mRNA and/or protein level; p) the
activity of beta-secretase and/or gamma secretase; q) the
activation state of an A.beta. induced signaling pathway; r) the
amount of intracellular total tau or free tau; s) the amount of
anti-tau antibody-bound tau in ISF or CSF; and t) the amount of
intracellular anti-Tau antibody-bound tau.
[0133] Administration of a subject anti-tau antibody to an
individual can in some cases improve cognitive function in the
individual, or at least reduce the rate of decline of cognitive
function in the individual.
[0134] In some cases, administration of a subject anti-tau antibody
to an individual reduces the amount of free extracellular tau
polypeptide (e.g., the amount of free extracellular tau polypeptide
in a brain tissue) by at least about 10%, at least about 20%, at
least about 25%, at least about 50%, or more than 50%, compared to
the amount of free extracellular tau polypeptide in the individual
before administration with the anti-tau antibody.
[0135] In some cases, administration of a subject anti-tau antibody
to an individual reduces the cell-to-cell (e.g., neuron-to-neuron)
spread of a tau polypeptide (e.g., a pathological tau polypeptide)
by at least about 10%, at least about 20%, at least about 25%, at
least about 50%, or more than 50%, compared to the cell-to-cell
spread before administration with a subject anti-tau antibody.
[0136] In some cases, administration of a subject anti-tau antibody
to an individual reduces the amount of tau aggregates (e.g.,
intracellular (e.g., intraneuronal) tau aggregates) by at least
about 10%, at least about 20%, at least about 25%, at least about
50%, or more than 50%, compared to the amount of tau aggregates
before administration with the anti-tau antibody.
[0137] In some cases, administration of a subject anti-tau antibody
to an individual reduces neurotoxicity in an individual; and/or
reduces neuroinflammation in an individual; and/or reduces
activation of astrocytes and microglia; and/or reduces induction of
pathological electrophysiological effects; and/or reduces the
amount of tau in exosomes.
[0138] In some cases, administration of a subject anti-tau antibody
to an individual reduces neuronal hyperactivity by at least about
10%, at least about 20%, at least about 25%, at least about 50%, or
more than 50%, compared to the level of degree of neuronal
hyperactivity before administration with the anti-tau antibody. In
some cases, administration of a subject anti-tau antibody to an
individual reduces neuronal hyperactivity by at least about 10%, at
least about 20%, at least about 25%, at least about 50%, or more
than 50%, as determined by whole cell patch clamp recording of a
neuron; e.g., whole cell patch clamp recording of an induced
pluripotent stem cell-derived cortical neuron (iPSC-CN) or of a
human cortical neuron cultures (HCC).
[0139] Administration of the suitable compositions may be effected
by different ways, e.g., by intravenous, intraperitoneal,
subcutaneous, intracranial, intrathecal, intraarterial (e.g., via
the carotid artery), intramuscular, intranasal, topical or
intradermal administration or spinal or brain delivery. Aerosol
formulations such as nasal spray formulations include purified
aqueous or other solutions of the active agent with preservative
agents and isotonic agents. Such formulations are adjusted to a pH
and isotonic state compatible with the nasal mucous membranes.
[0140] In some cases, a subject anti-tau antibody is modified, or
formulated, in such a manner as to provide the ability of the
antibody to cross the blood-brain barrier. Such an antibody or
antibody composition can be administered to an individual having a
tauopathy by various enteral and parenteral routes of
administration including oral, intravenous, etc.
[0141] Preparations for parenteral administration include sterile
aqueous or non-aqueous solutions, suspensions, and emulsions.
Examples of non-aqueous solvents are propylene glycol, polyethylene
glycol, vegetable oils such as olive oil, and injectable organic
esters such as ethyl oleate. Aqueous carriers include water,
alcoholic/aqueous solutions, emulsions or suspensions, including
saline and buffered media. Parenteral vehicles include sodium
chloride solution, Ringer's dextrose, dextrose and sodium chloride,
lactated Ringer's, or fixed oils. Intravenous vehicles include
fluid and nutrient replenishers, electrolyte replenishers (such as
those based on Ringer's dextrose), and the like. Preservatives and
other additives may also be present such as, for example,
antimicrobials, anti-oxidants, chelating agents, and inert gases
and the like. Furthermore, the pharmaceutical composition of the
present disclosure may comprise further agents such as dopamine or
psychopharmacologic drugs, depending on the intended use of the
pharmaceutical composition.
[0142] The dosage regimen will be determined by the attending
physician or other medical personnel, based on various clinical
factors. As is well known in the medical arts, dosages for any one
patient depends upon various factors, including the patient's size,
body surface area, age, the particular compound to be administered,
sex, time and route of administration, general health, and other
drugs being administered concurrently. A dose of a subject anti-tau
antibody can be, for example, in the range of 0.001 .mu.g to 1000
.mu.g; however, doses below or above this exemplary range are
envisioned, especially considering the aforementioned factors.
Generally, the dosage can range, e.g., from about 0.0001 to 100
mg/kg, or from about 0.01 to 5 mg/kg (e.g., 0.02 mg/kg, 0.25 mg/kg,
0.5 mg/kg, 0.75 mg/kg, 1 mg/kg, 2 mg/kg, etc.), of the host body
weight. For example dosages can be 1 mg/kg body weight or 10 mg/kg
body weight or within the range of 1-10 mg/kg, or at least 1 mg/kg.
Doses intermediate in the above ranges are also intended to be
within the scope of the invention. Subjects can be administered
such doses daily, on alternative days, weekly or according to any
other schedule determined by empirical analysis. An exemplary
treatment entails administration in multiple dosages over a
prolonged period, for example, of at least six months. Additional
exemplary treatment regimens entail administration once per every
two weeks or once a month or once every 3 to 6 months. Exemplary
dosage schedules include 1-10 mg/kg or 15 mg/kg on consecutive
days, 30 mg/kg on alternate days or 60 mg/kg weekly. In some
methods, two or more monoclonal antibodies with different binding
specificities are administered simultaneously, in which case the
dosage of each antibody administered falls within the ranges
indicated. Progress can be monitored by periodic assessment.
Combination Therapy
[0143] An anti-tau antibody of the present disclosure can be
administered to an individual in need thereof alone (e.g., as
monotherapy); or in combination therapy with one or more additional
therapeutic agents.
[0144] For the treatment of AD, suitable additional therapeutic
agents include, but are not limited to, acetylcholinesterase
inhibitors, including, but not limited to, Aricept (donepezil),
Exelon (rivastigmine), metrifonate, and tacrine (Cognex); an
anti-A.beta. antibody; non-steroidal anti-inflammatory agents,
including, but not limited to, ibuprofen and indomethacin;
cyclooxygenase-2 (Cox2) inhibitors such as Celebrex; and monoamine
oxidase inhibitors, such as Selegilene (Eldepryl or Deprenyl).
Dosages for each of the above agents are known in the art.
[0145] Another suitable additional therapeutic agent in the
treatment of AD is an agent that inhibits tau aggregation, e.g., a
napthoquinone derivative that inhibits tau aggregation, as
described in U.S. Pat. No. 7,605,179. Another suitable additional
therapeutic agent is an agent that inhibits phosphorylation of tau,
e.g., a 3-substituted-4-pyrimidone derivative that inhibits tau
protein kinase 1, as described in U.S. Pat. No. 7,572,793.
[0146] "In combination with" as used herein refers to uses where,
for example, the first compound is administered during the entire
course of administration of the second compound; where the first
compound is administered for a period of time that is overlapping
with the administration of the second compound, e.g. where
administration of the first compound begins before the
administration of the second compound and the administration of the
first compound ends before the administration of the second
compound ends; where the administration of the second compound
begins before the administration of the first compound and the
administration of the second compound ends before the
administration of the first compound ends; where the administration
of the first compound begins before administration of the second
compound begins and the administration of the second compound ends
before the administration of the first compound ends; where the
administration of the second compound begins before administration
of the first compound begins and the administration of the first
compound ends before the administration of the second compound
ends. As such, "in combination" can also refer to regimen involving
administration of two or more compounds. "In combination with" as
used herein also refers to administration of two or more compounds
which may be administered in the same or different formulations, by
the same of different routes, and in the same or different dosage
form type.
Individuals to be Treated
[0147] Individuals suitable for treatment with a subject anti-tau
antibody include individuals who have been diagnosed as having a
tauopathy; individuals at greater risk than the general population
for developing a tauopathy (e.g., individuals having a genetic
predisposition to developing a tauopathy); individuals with PDD;
and the like. In some cases, the individual is an adult human. In
some cases, the adult human is 30 years of age or older; 40 years
of age or older, 50 years of age or older, 60 years of age or
older, 70 years of age or older, or 80 years of age or older. For
example, the adult human can be from 40 years old to 50 years old,
from 50 years old to 60 years old, from 60 years old to 70 years
old, or older than 70 years.
Methods of Reducing A.beta.40 and A.beta.42 Levels
[0148] The present disclosure provides a method of reducing the
level of A.beta..sub.40 and/or A.beta..sub.42 in a neuronal cell
and/or extracellular fluid in an individual. The method generally
involves administering to the individual: a) an effective amount of
a humanized antibody that binds an N-terminal region of a tau
polypeptide; or b) a pharmaceutical composition comprising the
humanized antibody.
[0149] A humanized antibody that binds an N-terminal region of a
tau polypeptide, and that is suitable for use in a subject method
of reducing A.beta.40 and A.beta.42 in a neuronal cell and/or
extracellular fluid, is a humanized antibody that binds an epitope
of Tau that is within amino acids 2-176 of Tau, e.g., within amino
acids 2-15, amino acids 15-24, amino acids 24-50, amino acids 2-25,
amino acids 15 to 50, amino acids 50 to 75, amino acids 40 to 60,
amino acids 75 to 100, amino acids 60 to 80, amino acids 100 to
125, amino acids 80-115, amino acids 125 to 150, amino acids 115 to
140, amino acids 150 to 176, or amino acids 140 to 160, of Tau.
Exemplary Tau polypeptides are depicted in FIG. 20; an antibody
that reduces the level of A.beta..sub.40 and/or A.beta..sub.42 in a
neuronal cell and/or extracellular fluid in an individual can be a
humanized antibody that specifically binds an epitope in a Tau
polypeptide depicted in FIG. 20.
[0150] In some cases, an antibody that reduces the level of
A.beta..sub.40 and/or A.beta..sub.42 in a neuronal cell and/or
extracellular fluid in an individual, and that is suitable for use
in a subject method, is a humanized anti-Tau antibody of the
present disclosure. In some cases, the antibody is a humanized
antibody that binds an epitope within amino acids 15-24 of Tau.
Anti-Tau Antibodies
[0151] The present disclosure provides isolated anti-Tau
antibodies, and pharmaceutical formulations comprising same.
[0152] The present disclosure provides an isolated antibody that
specifically binds an epitope within an N-terminal region of a Tau
polypeptide (e.g., a linear epitope within an amino-terminal
(N-terminal) portion of Tau, e.g., within amino acids 1-25 of Tau,
within amino acids 1-18 of Tau, within amino acids 9 to 18 of Tau
(where amino acids 1-18 of Tau are: MAEPRQEFEVMEDHAGTY; SEQ ID
NO:53), within amino acids 15-44 of Tau, within amino acids 13-24
of Tau, or within amino acids 15-24 of Tau (where amino acids 15-24
of Tau are: AGTYGLGDRK (SEQ ID NO:51). In some instances, the
antibody is humanized, e.g., one or more framework regions of the
heavy chain variable region and/or the light chain variable region
includes sequences derived from a human immunoglobulin
framework.
[0153] The present disclosure provides an isolated humanized
monoclonal antibody that specifically binds an epitope within amino
acids 15-24 of a Tau polypeptide. In some cases, the epitope does
not comprise a phosphorylated amino acid. In some case, the epitope
does not comprise a nitrated amino acid. In some cases, the epitope
comprises a phosphorylated amino acid, a nitrated amino acid, or
both a phosphorylated amino acid and a nitrated amino acid.
[0154] Humanization of a framework region(s) reduces the risk of
the antibody eliciting a human-anti-mouse-antibody (HAMA) response
in humans. Art-recognized methods of determining immune response
can be performed to monitor a HAMA response in a particular patient
or during clinical trials. Patients administered humanized
antibodies can be given an immunogenicity assessment at the
beginning and throughout the administration of the therapy. The
HAMA response is measured, for example, by detecting antibodies to
the humanized therapeutic reagent, in serum samples from the
patient using a method known to one in the art, including surface
plasmon resonance technology (BIACORE) and/or solid-phase
enzyme-linked immunosorbent assay (ELISA) analysis. In many cases,
a subject humanized anti-Tau antibody does not substantially elicit
a HAMA response in a human subject. In some cases, a subject
humanized anti-Tau antibody has reduced immunogenic potential, as
determined by an EpiScreen.TM. assay performed using
CD8.sup.+-depleted peripheral blood mononuclear cells. In some
cases, a subject humanized anti-Tau antibody exhibits a Stimulation
Index of less than 2.0.
[0155] Certain amino acids from the human variable region framework
residues are selected for substitution based on their possible
influence on CDR conformation and/or binding to antigen. The
unnatural juxtaposition of murine CDR regions with human variable
framework region can result in unnatural conformational restraints,
which, unless corrected by substitution of certain amino acid
residues, lead to loss of binding affinity.
[0156] The selection of amino acid residues for substitution can be
determined, in part, by computer modeling. Computer hardware and
software for producing three-dimensional images of immunoglobulin
molecules are known in the art. In general, molecular models are
produced starting from solved structures for immunoglobulin chains
or domains thereof. The chains to be modeled are compared for amino
acid sequence similarity with chains or domains of solved
three-dimensional structures, and the chains or domains showing the
greatest sequence similarity is/are selected as starting points for
construction of the molecular model. Chains or domains sharing at
least 50% sequence identity are selected for modeling, e.g., those
sharing at least 60%, 70%, 80%, 90%, or more than 90%, sequence
identity or more are selected for modeling. The solved starting
structures are modified to allow for differences between the actual
amino acids in the immunoglobulin chains or domains being modeled,
and those in the starting structure. The modified structures are
then assembled into a composite immunoglobulin. Finally, the model
is refined by energy minimization and by verifying that all atoms
are within appropriate distances from one another and that bond
lengths and angles are within chemically acceptable limits.
[0157] CDR and framework regions are as defined by Kabat, Sequences
of Proteins of Immunological Interest (National Institutes of
Health, Bethesda, Md., 1987 and 1991). An alternative structural
definition has been proposed by Chothia et al., J. Mol. Biol.
196:901 (1987); Nature 342:878 (1989); and J. Mol. Biol. 186:651
(1989) (collectively referred to as "Chothia"). When framework
residues, as defined by Kabat, supra, constitute structural loop
residues as defined by Chothia, supra, the amino acids present in
the mouse antibody may be selected for substitution into the
humanized antibody. Residues which are "adjacent to a CDR region"
include amino acid residues in positions immediately adjacent to
one or more of the CDRs in the primary sequence of the humanized
immunoglobulin chain, for example, in positions immediately
adjacent to a CDR as defined by Kabat, or a CDR as defined by
Chothia (See e.g., Chothia and Lesk J M B 196:901 (1987)). These
amino acids are particularly likely to interact with the amino
acids in the CDRs and, if chosen from the acceptor, to distort the
donor CDRs and reduce affinity. Moreover, the adjacent amino acids
may interact directly with the antigen (Amit et al., Science,
233:747 (1986)) and selecting these amino acids from the donor may
be desirable to keep all the antigen contacts that provide affinity
in the original antibody.
[0158] The present disclosure provides an isolated antibody
comprising a humanized light chain framework region; and a
humanized heavy chain framework region, wherein the isolated
antibody competes for binding to an epitope in an N-terminal region
of a Tau polypeptide with an antibody that comprises: a) a light
chain region comprising: i) a V.sub.L CDR1 comprising an amino acid
sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2
comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID NO:8;
and (iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ
ID NO:3 or SEQ ID NO:9; and b) a heavy chain region comprising: (i)
a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID NO:4 or
SEQ ID NO:10; (ii) a V.sub.H CDR2 comprising an amino acid sequence
of SEQ ID NO:5 or SEQ ID NO:11; and (iii) a V.sub.H CDR3 comprising
an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12. In some
cases, the light chain region and the heavy chain region are
present in separate polypeptides. In other cases, the light chain
region and the heavy chain region are present in a single
polypeptide. The isolated antibody can include a heavy chain that
comprises a constant region of the isotype IgG1, IgG2, IgG3, or
IgG4. In other cases, the antibody is a Fv, scFv, Fab, F(ab')2, or
Fab'. The antibody can comprise a covalently linked non-peptide
synthetic polymer, e.g., where the synthetic polymer is a
poly(ethylene glycol) polymer. In some cases, the isolated antibody
is fused, directly or via a linker, to a carrier molecule, a
peptide or a protein that promotes the crossing of the blood-brain
barrier. In some cases, the epitope bound by the isolated antibody
is within amino acids 15-24 of a Tau polypeptide. The isolated
antibody humanized light chain framework region can comprise 1, 2,
3, 4, 5, 6, 7, 8, 9, or 10 of the amino acid substitutions depicted
in Table 3. The isolated antibody humanized heavy chain framework
region comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 of the
amino acid substitutions depicted in Table 2.
[0159] In some embodiments, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, e.g., a linear epitope within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51))
comprises: a) a light chain region comprising: i) one, two, or
three complementarity determining regions (CDRs) of an IPN001
antibody, where the CDRs are as defined by Kabat (see, e.g., Table
1, above; and Kabat et al., U.S. Dept. of Health and Human
Services, "Sequences of proteins of immunological interest"
(1991)).
[0160] In some embodiments, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, e.g., a linear epitope within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51))
comprises: a) a light chain region comprising: i) one, two, or
three V.sub.L CDRs of an IPN001 antibody; and ii) a humanized light
chain framework region; and b) a heavy chain region comprising: i)
one, two, or three V.sub.H CDRs of an IPN001 antibody; and ii) a
humanized heavy chain framework region; where the V.sub.H and
V.sub.L CDRs are as defined by Kabat (see, e.g., Table 1, above;
and Kabat et al., U.S. Dept. of Health and Human Services,
"Sequences of proteins of immunological interest" (1991)). In some
of these embodiments, the anti-Tau antibody includes a humanized
V.sub.H and/or V.sub.L framework region.
[0161] In some embodiments, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, e.g., a linear epitope within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51))
comprises: a) a light chain region comprising: i) one, two, or
three V.sub.L CDRs of an IPN001 antibody; and ii) a humanized light
chain framework region; and b) a heavy chain region comprising: i)
one, two, or three V.sub.H CDRs of an IPN001 antibody; and ii) a
humanized heavy chain framework region; where the V.sub.H and
V.sub.L CDRs are as defined by Chothia (see, e.g., Table 1, above;
and Chothia et al., J. Mol. Biol. 196:901-917 (1987)).
[0162] In some embodiments, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, e.g., a linear epitope within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51))
comprises: a) a light chain region comprising: i) one, two, or
three V.sub.L CDRs of an IPN002 antibody; and ii) a humanized light
chain framework region; and b) a heavy chain region comprising: i)
one, two, or three V.sub.H CDRs of an IPN002 antibody; and ii) a
humanized heavy chain framework region; where the V.sub.H and
V.sub.L CDRs are as defined by Kabat (see, e.g., Table 1, above;
and Kabat et al., U.S. Dept. of Health and Human Services,
"Sequences of proteins of immunological interest" (1991)).
[0163] In some embodiments, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, e.g., a linear epitope within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51))
comprises: a) a light chain region comprising: i) one, two, or
three V.sub.L CDRs of an IPN002 antibody; and ii) a humanized light
chain framework region; and b) a heavy chain region comprising: i)
one, two, or three V.sub.H CDRs of an IPN002 antibody; and ii) a
humanized heavy chain framework region; where the V.sub.H and
V.sub.L CDRs are as defined by Chothia (see, e.g., Table 1, above;
and Chothia et al., J. Mol. Biol. 196:901-917 (1987)).
[0164] In some embodiments, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, e.g., a linear epitope within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51))
comprises: a) a light chain region comprising: i) one, two, or
three CDRs selected from SEQ ID NO:1, SEQ ID NO:2, and SEQ ID NO:3;
and ii) a humanized light chain framework region; and b) a heavy
chain region comprising: i) one, two, or three CDRs selected from
SEQ ID NO:4, SEQ ID NO:5, and SEQ ID NO:6; and ii) a humanized
heavy chain framework region.
[0165] In some embodiments, an anti-Tau antibody of the present
disclosure (e.g., a subject antibody that specifically binds an
epitope in a Tau polypeptide, e.g., a linear epitope within an
amino-terminal (N-terminal) portion of Tau, e.g., within amino
acids 1-25 of Tau, within amino acids 1-18 of Tau, within amino
acids 9 to 18 of Tau (where amino acids 1-18 of Tau are:
MAEPRQEFEVMEDHAGTY; SEQ ID NO:53), within amino acids 15-44 of Tau,
within amino acids 13-24 of Tau, or within amino acids 15-24 of Tau
(where amino acids 15-24 of Tau are: AGTYGLGDRK (SEQ ID NO:51))
comprises: a) a light chain region comprising: i) one, two, or
three CDRs selected from SEQ ID NO:7, SEQ ID NO:8, and SEQ ID NO:9;
and ii) a humanized light chain framework region; and b) a heavy
chain region comprising: i) one, two, or three CDRs selected from
SEQ ID NO:10, SEQ ID NO:11, and SEQ ID NO:12; and ii) a humanized
heavy chain framework region.
[0166] In some instances, the antibody comprises: a) a light chain
region comprising: i) a V.sub.L CDR1 comprising an amino acid
sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2
comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID NO:8;
(iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ ID
NO:3 or SEQ ID NO:9; and (iv) a humanized light chain framework
region; and b) a heavy chain region comprising: (i) a V.sub.H CDR1
comprising an amino acid sequence of SEQ ID NO:4 or SEQ ID NO:10;
(ii) a V.sub.H CDR2 comprising an amino acid sequence of SEQ ID
NO:5 or SEQ ID NO:11; (iii) a V.sub.H CDR3 comprising an amino acid
sequence of SEQ ID NO:6 or SEQ ID NO:12; and iv) a humanized heavy
chain framework region.
[0167] In some embodiments, a subject anti-Tau antibody comprises a
heavy chain variable region comprising one, two, or three of the
heavy chain CDRs having an amino acid sequence selected from one or
more of SEQ ID NOs:4, 5, and 6; and one, two, three, or four FR
regions that are humanized. For example, in some embodiments, a
subject antibody comprises a heavy chain variable region that
comprises, in order from N-terminus to C-terminus: a humanized
heavy chain FR1; a CDR1 comprising the amino acid sequence set
forth in SEQ ID NO:4; a humanized heavy chain FR2; a CDR2
comprising the amino acid sequence set forth in SEQ ID NO:5; a
humanized heavy chain FR3; a CDR3 comprising the amino acid
sequence set forth in SEQ ID NO:6; and a humanized heavy chain
FR4.
[0168] In some embodiments, a subject anti-Tau antibody comprises a
light chain variable region comprising one, two, or three of the
light chain CDRs having a polypeptide sequence selected from one or
more of SEQ ID NOs:1, 2, and 3; and one, two, three, or four FR
regions that are humanized. For example, in some embodiments, a
subject antibody comprises a light chain variable region that
comprises, in order from N-terminus to C-terminus: a humanized
light chain FR1; a CDR1 comprising the amino acid sequence set
forth in SEQ ID NO:1; a humanized light chain FR2; a CDR2
comprising the amino acid sequence set forth in SEQ ID NO:2; a
humanized light chain FR3; a CDR3 comprising the amino acid
sequence set forth in SEQ ID NO:3; and a humanized light chain
FR4.
[0169] In some embodiments, a subject anti-Tau antibody comprises a
heavy chain variable region comprising one, two, or three of the
heavy chain CDRs having an amino acid sequence selected from one or
more of SEQ ID NOs:10, 11, and 12; and one, two, three, or four FR
regions that are humanized. For example, in some embodiments, a
subject antibody comprises a heavy chain variable region that
comprises, in order from N-terminus to C-terminus: a humanized
heavy chain FR1; a CDR1 comprising the amino acid sequence set
forth in SEQ ID NO:10; a humanized heavy chain FR2; a CDR2
comprising the amino acid sequence set forth in SEQ ID NO:11; a
humanized heavy chain FR3; a CDR3 comprising the amino acid
sequence set forth in SEQ ID NO:12; and a humanized heavy chain
FR4.
[0170] In some embodiments, a subject anti-Tau antibody comprises a
light chain variable region comprising one, two, or three of the
light chain CDRs having a polypeptide sequence selected from one or
more of SEQ ID NOs:7, 8, and 9; and one, two, three, or four FR
regions that are humanized. For example, in some embodiments, a
subject antibody comprises a light chain variable region that
comprises, in order from N-terminus to C-terminus: a humanized
light chain FR1; a CDR1 comprising the amino acid sequence set
forth in SEQ ID NO:7; a humanized light chain FR2; a CDR2
comprising the amino acid sequence set forth in SEQ ID NO:8; a
humanized light chain FR3; a CDR3 comprising the amino acid
sequence set forth in SEQ ID NO:9; and a humanized light chain
FR4.
[0171] V.sub.H and V.sub.L amino acid sequences of IPN001 are
depicted in FIGS. 1A and 1B. CDRs (as defined by Kabat) are in bold
text and underlined. V.sub.H and V.sub.L amino acid sequences of
IPN002 are depicted in FIGS. 2A and 2B. CDRs (as defined by Kabat)
are in bold text and underlined.
[0172] SEQ ID NOs:1-12 are as follows:
TABLE-US-00003 RSSQTILHSNGNTYLE; (SEQ ID NO: 1) KVSKRFS; (SEQ ID
NO: 2) FQGSLVPWA; (SEQ ID NO: 3) SYGMS; (SEQ ID NO: 4)
TISSSGSRTYFPDSVKG; (SEQ ID NO: 5) TWDGAMDY; (SEQ ID NO: 6)
KSSQSIVHSNGNTYLE; (SEQ ID NO: 7) KVSNRFS; (SEQ ID NO: 8) FQGSLVPWA;
(SEQ ID NO: 9) KYGMS; (SEQ ID NO: 10) TISSSGSRTYYPDSVKG; (SEQ ID
NO: 11) SWDGAMDY. (SEQ ID NO: 12)
[0173] A subject anti-Tau antibody can comprise a light chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 1B and set forth in SEQ
ID NO:13.
[0174] A subject anti-Tau antibody can comprise a heavy chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 1A and set forth in SEQ
ID NO:14.
[0175] A subject anti-Tau antibody can comprise a light chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 2B and set forth in SEQ
ID NO:15.
[0176] A subject anti-Tau antibody can comprise a heavy chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 2A and set forth in SEQ
ID NO:16.
[0177] A subject anti-Tau antibody can comprise a heavy chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 9 (VH variant 1).
[0178] A subject anti-Tau antibody can comprise a heavy chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 10 (VH variant 2).
[0179] A subject anti-Tau antibody can comprise a heavy chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 11 (VH variant 3).
[0180] A subject anti-Tau antibody can comprise a heavy chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 12 (VH variant 4).
[0181] A subject anti-Tau antibody can comprise a light chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 13 (Vk variant 1).
[0182] A subject anti-Tau antibody can comprise a light chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 14 (Vk variant 2).
[0183] A subject anti-Tau antibody can comprise a light chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 15 (Vk variant 3).
[0184] A subject anti-Tau antibody can comprise a light chain
variable region comprising an amino acid sequence that is 85%, 86%,
87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%
identical to the sequence depicted in FIG. 16 (Vk variant 4).
[0185] A subject anti-Tau antibody can comprise a heavy chain
variable region comprising 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12
of the framework (FR) amino acid substitutions, relative to the
IPN002 parental antibody FR amino acid sequences, depicted in Table
2.
TABLE-US-00004 TABLE 2 VH Variants IPN002 Amino Acid (Parental VH
VH VH VH Position antibody) Variant 1 Variant 2 Variant 3 Variant 4
FR1 3 H H H Q Q 19 K R R R R FR2 40 T A A A A 42 D G G G G 44 R G G
G G FR3 66 Q R R R R 83 S S N N N 85 L S L L L 86 K K R R R 87 S S
A A A 93 S S S S A FR4 108 S S T T T
[0186] For example, a subject anti-Tau antibody can comprise a
heavy chain variable region comprising an H.fwdarw.Q substitution
at amino acid position 3 in VH FR1 and/or a K.fwdarw.R substitution
at amino acid position 19 in VH FR1.
[0187] As another example, a subject anti-Tau antibody can comprise
a heavy chain variable region comprising a T.fwdarw.A substitution
at amino acid position 40 in VH FR2 and/or a D.fwdarw.G
substitution at amino acid position 42 in VH FR2 and/or an
R.fwdarw.G substitution at position 44 in VH FR2.
[0188] As another example, a subject anti-Tau antibody can comprise
a heavy chain variable region comprising a Q.fwdarw.R substitution
at amino acid position 66 in VH FR3 and/or an S.fwdarw.N
substitution at amino acid position 83 in VH FR3 and/or an
L.fwdarw.S substitution at amino acid position 85 in VH FR3 and/or
a K.fwdarw.R substitution at amino acid position 86 in FR3 and/or
an S.fwdarw.A substitution at amino acid position 87 in VH FR3
and/or an S.fwdarw.A substitution at amino acid position 93 in VH
FR3.
[0189] As another example, a subject anti-Tau antibody can comprise
a heavy chain variable region comprising an S.fwdarw.T substitution
at amino acid position 108 in VH FR4.
[0190] In some cases, a subject isolated anti-Tau antibody can
comprise, in order from N-terminus to C-terminus a VH region
comprising: EVX.sub.1LVESGGALVKPGGSLRLSCAASGFSFS (SEQ ID NO:83); VH
CDR1 as shown in FIG. 2A; WVRQAPGKGLEWVA (SEQ ID NO:84); VH CDR2 as
shown in FIG. 2A;
RFTISRDNAKNTLYLQMX.sub.2SX.sub.3X.sub.4X.sub.5EDTAMYYCX.sub.6I (SEQ
ID NO:85); VH CDR3 as shown in FIG. 2A; WGQGTX.sub.7VTVSS (SEQ ID
NO:86), where X.sub.1 is H or Q; X.sub.2 is S or N; X.sub.3 is S or
L; X.sub.4 is K or R; X.sub.5 is S or A; X.sub.6 is S or A; and
X.sub.7 is S or T.
[0191] A subject anti-Tau antibody can comprise a light chain
variable region comprising 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 of the
framework (FR) amino acid substitutions, relative to the IPN002
parental antibody FR amino acid sequences, depicted in Table 3.
TABLE-US-00005 TABLE 3 Vk Variants IPN002 Amino Acid (Parental Vk
Vk Vk Vk Position antibody) Variant 1 Variant 2 Variant 3 Variant 4
FR1 3 L L V V V 7 T S S S S 14 S T T T T 17 D Q Q Q Q 18 Q P P P P
FR2 45 K Q Q Q Q 48 V V V V I FR3 83 L V V V V 85 T T T V V FR4 104
L V V V V
[0192] For example, a subject anti-Tau antibody can comprise a
light chain variable region comprising an L.fwdarw.V substitution
at amino acid position 3 in VL FR1 and/or a T.fwdarw.S substitution
at amino acid position 7 in VL FR1 and/or an S.fwdarw.T
substitution at amino acid position 14 in VL FR1 and/or a
D.fwdarw.Q substitution at amino acid position 17 in VL FR1 and/or
a Q.fwdarw.P substitution at amino acid position 18 in VL FR1.
[0193] As another example, a subject anti-Tau antibody can comprise
a light chain variable region comprising a K.fwdarw.Q substitution
at amino acid position 45 of VL FR2 and/or a V.fwdarw.I
substitution at amino acid position 48 of VL FR2.
[0194] As another example, a subject anti-Tau antibody can comprise
a light chain variable region comprising an L.fwdarw.V substitution
at amino acid position 83 of VL FR3 and/or a T.fwdarw.V
substitution at amino acid position 85 of VL FR3.
[0195] As another example, a subject anti-Tau antibody can comprise
a light chain variable region comprising an L.fwdarw.V substitution
at amino acid position 104 of VL FR4.
[0196] In some cases, a subject isolated anti-Tau antibody can
comprise, in order from N-terminus to C-terminus a VL region
comprising: DVX.sub.1MTQSPLSLPVTLGQPASISC (SEQ ID NO:54); VL CDR1
as shown in FIG. 2B; WYLQKPGQSPQLLX.sub.2Y (SEQ ID NO:55); VL CDR2
as shown in FIG. 2B; GVPDRFSGSGSGTDFTLKISRVEAEDVGX.sub.3YYC (SEQ ID
NO:56); VL CDR3 as shown in FIG. 2B; FGGGTKVEIK (SEQ ID NO:57);
where X.sub.1 is L or V; X.sub.2 is V or I; and X.sub.3 is T or
V.
[0197] In some cases, an anti-Tau antibody of the present
disclosure comprises:
[0198] a) a VH variant 1 comprising the amino acid sequence
depicted in FIG. 9; and a Vk variant 1 comprising the amino acid
sequence depicted in FIG. 13;
[0199] b) a VH variant 1 comprising the amino acid sequence
depicted in FIG. 9; and a Vk variant 2 comprising the amino acid
sequence depicted in FIG. 14;
[0200] c) a VH variant 1 comprising the amino acid sequence
depicted in FIG. 9; and a Vk variant 3 comprising the amino acid
sequence depicted in FIG. 15;
[0201] d) a VH variant 1 comprising the amino acid sequence
depicted in FIG. 9; and a Vk variant 4 comprising the amino acid
sequence depicted in FIG. 16;
[0202] e) a VH variant 2 comprising the amino acid sequence
depicted in FIG. 10; and a Vk variant 1 comprising the amino acid
sequence depicted in FIG. 13;
[0203] f) a VH variant 2 comprising the amino acid sequence
depicted in FIG. 10; and a Vk variant 2 comprising the amino acid
sequence depicted in FIG. 14;
[0204] g) a VH variant 2 comprising the amino acid sequence
depicted in FIG. 10; and a Vk variant 3 comprising the amino acid
sequence depicted in FIG. 15;
[0205] h) a VH variant 2 comprising the amino acid sequence
depicted in FIG. 10; and a Vk variant 4 comprising the amino acid
sequence depicted in FIG. 16;
[0206] i) a VH variant 3 comprising the amino acid sequence
depicted in FIG. 11; and a Vk variant 1 comprising the amino acid
sequence depicted in FIG. 13;
[0207] j) a VH variant 3 comprising the amino acid sequence
depicted in FIG. 11; and a Vk variant 2 comprising the amino acid
sequence depicted in FIG. 14;
[0208] k) a VH variant 3 comprising the amino acid sequence
depicted in FIG. 11; and a Vk variant 3 comprising the amino acid
sequence depicted in FIG. 15;
[0209] l) a VH variant 3 comprising the amino acid sequence
depicted in FIG. 11; and a Vk variant 4 comprising the amino acid
sequence depicted in FIG. 16;
[0210] m) a VH variant 4 comprising the amino acid sequence
depicted in FIG. 12; and a Vk variant 1 comprising the amino acid
sequence depicted in FIG. 13;
[0211] n) a VH variant 4 comprising the amino acid sequence
depicted in FIG. 12; and a Vk variant 2 comprising the amino acid
sequence depicted in FIG. 14;
[0212] o) a VH variant 4 comprising the amino acid sequence
depicted in FIG. 12; and a Vk variant 3 comprising the amino acid
sequence depicted in FIG. 15; or p) a VH variant 4 comprising the
amino acid sequence depicted in FIG. 12; and a Vk variant 4
comprising the amino acid sequence depicted in FIG. 16.
[0213] In some embodiments, a subject antibody comprises anti-Tau
heavy chain CDRs and anti-Tau light chain CDRs in a single
polypeptide chain, e.g., in some embodiments, a subject antibody is
a scFv. In some embodiments, a subject antibody comprises, in order
from N-terminus to C-terminus: a first amino acid sequence of from
about 5 amino acids to about 25 amino acids in length; a CDR1
comprising the amino acid sequence set forth in SEQ ID NO:1; a
second amino acid sequence of from about 5 amino acids to about 25
amino acids in length; a CDR2 comprising the amino acid sequence
set forth in SEQ ID NO:2; a third amino acid sequence of from about
5 amino acids to about 25 amino acids in length; a CDR3 comprising
the amino acid sequence set forth in SEQ ID NO:3; a fourth amino
acid sequence of from about 5 amino acids to about 25 amino acids
in length; a CDR1 comprising the amino acid sequence set forth in
SEQ ID NO:4; a fifth amino acid sequence of from about 5 amino
acids to about 25 amino acids in length; a CDR2 comprising the
amino acid sequence set forth in SEQ ID NO:5; a sixth amino acid
sequence of from about 5 amino acids to about 25 amino acids in
length; a CDR3 comprising the amino acid sequence set forth in SEQ
ID NO:6; and a seventh amino acid sequence of from about 5 amino
acids to about 25 amino acids in length.
[0214] In some embodiments, a subject antibody comprises, in order
from N-terminus to C-terminus: a light chain FR1 region; a CDR1
comprising the amino acid sequence set forth in SEQ ID NO:1; a
light chain FR2 region; a CDR2 comprising the amino acid sequence
set forth in SEQ ID NO:2; a light chain FR3 region; a CDR3
comprising the amino acid sequence set forth in SEQ ID NO:3;
optionally a light chain FR4 region; a linker region; optionally a
heavy chain FR1 region; a CDR1 comprising the amino acid sequence
set forth in SEQ ID:4; a heavy chain FR2 region; a CDR2 comprising
the amino acid sequence set forth in SEQ ID NO:5; a heavy chain FR3
region; a CDR3 comprising the amino acid sequence set forth in SEQ
ID NO:6; and a heavy chain FR4 region. In some of these
embodiments, one or more of the FR regions is a humanized FR
region. In some of these embodiments, each of the FR regions is a
humanized FR region. The linker region can be from about 5 amino
acids to about 50 amino acids in length, e.g., from about 5 aa to
about 10 aa, from about 10 aa to about 15 aa, from about 15 aa to
about 20 aa, from about 20 aa to about 25 aa, from about 25 aa to
about 30 aa, from about 30 aa to about 35 aa, from about 35 aa to
about 40 aa, from about 40 aa to about 45 aa, or from about 45 aa
to about 50 aa in length.
[0215] In some embodiments, a subject antibody comprises, in order
from N-terminus to C-terminus: a heavy chain FR1 region; a CDR1
comprising the amino acid sequence set forth in SEQ ID:4; a heavy
chain FR2 region; a CDR2 comprising the amino acid sequence set
forth in SEQ ID NO:5; a heavy chain FR3 region; a CDR3 comprising
the amino acid sequence set forth in SEQ ID NO:6; optionally a
heavy chain FR4 region; a linker; optionally a light chain FR1
region; a CDR1 comprising the amino acid sequence set forth in SEQ
ID NO:1; a light chain FR2 region; a CDR2 comprising the amino acid
sequence set forth in SEQ ID NO:2; a light chain FR3 region; a CDR3
comprising the amino acid sequence set forth in SEQ ID NO:3; and a
light chain FR4 region. In some of these embodiments, one or more
of the FR regions is a humanized FR region. In some of these
embodiments, each of the FR regions is a humanized FR region. The
linker region can be from about 5 amino acids to about 50 amino
acids in length, e.g., from about 5 aa to about 10 aa, from about
10 aa to about 15 aa, from about 15 aa to about 20 aa, from about
20 aa to about 25 aa, from about 25 aa to about 30 aa, from about
30 aa to about 35 aa, from about 35 aa to about 40 aa, from about
40 aa to about 45 aa, or from about 45 aa to about 50 aa in
length.
[0216] In some embodiments, a subject antibody comprises, in order
from N-terminus to C-terminus: a light chain FR1 region; a CDR1
comprising the amino acid sequence set forth in SEQ ID NO:7; a
light chain FR2 region; a CDR2 comprising the amino acid sequence
set forth in SEQ ID NO:8; a light chain FR3 region; a CDR3
comprising the amino acid sequence set forth in SEQ ID NO:9;
optionally a light chain FR4 region; a linker region; optionally a
heavy chain FR1 region; a CDR1 comprising the amino acid sequence
set forth in SEQ ID:10; a heavy chain FR2 region; a CDR2 comprising
the amino acid sequence set forth in SEQ ID NO:11; a heavy chain
FR3 region; a CDR3 comprising the amino acid sequence set forth in
SEQ ID NO:12; and a heavy chain FR4 region. In some of these
embodiments, one or more of the FR regions is a humanized FR
region. In some of these embodiments, each of the FR regions is a
humanized FR region. The linker region can be from about 5 amino
acids to about 50 amino acids in length, e.g., from about 5 aa to
about 10 aa, from about 10 aa to about 15 aa, from about 15 aa to
about 20 aa, from about 20 aa to about 25 aa, from about 25 aa to
about 30 aa, from about 30 aa to about 35 aa, from about 35 aa to
about 40 aa, from about 40 aa to about 45 aa, or from about 45 aa
to about 50 aa in length.
[0217] In some embodiments, a subject antibody comprises, in order
from N-terminus to C-terminus: a heavy chain FR1 region; a CDR1
comprising the amino acid sequence set forth in SEQ ID:10; a heavy
chain FR2 region; a CDR2 comprising the amino acid sequence set
forth in SEQ ID NO:11; a heavy chain FR3 region; a CDR3 comprising
the amino acid sequence set forth in SEQ ID NO:12; optionally a
heavy chain FR4 region; a linker; optionally a light chain FR1
region; a CDR1 comprising the amino acid sequence set forth in SEQ
ID NO:7; a light chain FR2 region; a CDR2 comprising the amino acid
sequence set forth in SEQ ID NO:8; a light chain FR3 region; a CDR3
comprising the amino acid sequence set forth in SEQ ID NO:9; and a
light chain FR4 region. In some of these embodiments, one or more
of the FR regions is a humanized FR region. In some of these
embodiments, each of the FR regions is a humanized FR region. The
linker region can be from about 5 amino acids to about 50 amino
acids in length, e.g., from about 5 aa to about 10 aa, from about
10 aa to about 15 aa, from about 15 aa to about 20 aa, from about
20 aa to about 25 aa, from about 25 aa to about 30 aa, from about
30 aa to about 35 aa, from about 35 aa to about 40 aa, from about
40 aa to about 45 aa, or from about 45 aa to about 50 aa in
length.
[0218] Linkers suitable for use a subject antibody include
"flexible linkers". If present, the linker molecules are generally
of sufficient length to permit some flexible movement between
linked regions. The linker molecules are generally about 6-50 atoms
long. The linker molecules may also be, for example, aryl
acetylene, ethylene glycol oligomers containing 2-10 monomer units,
diamines, diacids, amino acids, or combinations thereof. Other
linker molecules which can bind to polypeptides may be used in
light of this disclosure.
[0219] Suitable linkers can be readily selected and can be of any
of a suitable of different lengths, such as from 1 amino acid
(e.g., Gly) to 20 amino acids, from 2 amino acids to 15 amino
acids, from 3 amino acids to 12 amino acids, including 4 amino
acids to 10 amino acids, 5 amino acids to 9 amino acids, 6 amino
acids to 8 amino acids, or 7 amino acids to 8 amino acids, and may
be 1, 2, 3, 4, 5, 6, or 7 amino acids.
[0220] Exemplary flexible linkers include glycine polymers
(G).sub.n, glycine-serine polymers (including, for example,
(GS).sub.n, GSGGS.sub.n (SEQ ID NO:58) and GGGS.sub.n (SEQ ID
NO:59), where n is an integer of at least one), glycine-alanine
polymers, alanine-serine polymers, and other flexible linkers known
in the art. Glycine and glycine-serine polymers are of interest
since both of these amino acids are relatively unstructured, and
therefore may serve as a neutral tether between components. Glycine
polymers are of particular interest since glycine accesses
significantly more phi-psi space than even alanine, and is much
less restricted than residues with longer side chains (see
Scheraga, Rev. Computational Chem. 11173-142 (1992)). Exemplary
flexible linkers include, but are not limited GGSG (SEQ ID NO:60),
GGSGG (SEQ ID NO:61), GSGSG (SEQ ID NO:62), GSGGG (SEQ ID NO:63),
GGGSG (SEQ ID NO:64), GSSSG (SEQ ID NO:65), and the like. The
ordinarily skilled artisan will recognize that design of a peptide
conjugated to any elements described above can include linkers that
are all or partially flexible, such that the linker can include a
flexible linker as well as one or more portions that confer less
flexible structure.
[0221] In some cases, a subject isolated antibody is an antibody
fragment, an Fv, scFv, Fab, F(ab')2, or Fab'. Thus, the present
disclosure provides an isolated antibody, wherein the antibody is a
Fv, scFv, Fab, F(ab')2, or Fab', and wherein the antibody competes
for binding to an epitope in an N-terminal region of a Tau
polypeptide with an antibody that comprises: a) a light chain
region comprising: i) a V.sub.L CDR1 comprising an amino acid
sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2
comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID NO:8;
and (iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ
ID NO:3 or SEQ ID NO:9; and b) a heavy chain region comprising: (i)
a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID NO:4 or
SEQ ID NO:10; (ii) a V.sub.H CDR2 comprising an amino acid sequence
of SEQ ID NO:5 or SEQ ID NO:11; and (iii) a V.sub.H CDR3 comprising
an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12. In some of
these embodiments, the isolated antibody comprises one, two, three,
or four humanized VL framework regions, as described above. In some
of these embodiments, the isolated antibody comprises one, two,
three, or four humanized VH framework regions, as described
above.
[0222] In some embodiments, an anti-Tau antibody of the present
disclosure is a scFv antibody. In some embodiments, an anti-Tau
antibody of the present disclosure comprises scFv multimers. For
example, in some embodiments, a subject antibody is an scFv dimer
(e.g., comprises two tandem scFv (scFv.sub.2)), an scFv trimer
(e.g., comprises three tandem scFv (scFv.sub.3)), an scFv tetramer
(e.g., comprises four tandem scFv (scFv.sub.4)), or is a multimer
of more than four scFv (e.g., in tandem). The scFv monomers can be
linked in tandem via linkers of from about 2 amino acids to about
10 amino acids (aa) in length, e.g., 2 aa, 3 aa, 4 aa, 5 aa, 6 aa,
7 aa, 8 aa, 9 aa, or aa in length. Suitable linkers include, e.g.,
(Gly).sub.x, where x is an integer from 2 to 10. Other suitable
linkers are those discussed above. In some embodiments, each of the
scFv monomers in a subject scFV multimer is humanized, as described
above.
[0223] In some cases, a subject antibody comprises a constant
region of an immunoglobulin (e.g., an Fc region). The Fc region, if
present, can be a human Fc region. If constant regions are present,
the antibody can contain both light chain and heavy chain constant
regions. Suitable heavy chain constant region include CH1, hinge,
CH2, CH3, and CH4 regions. The antibodies described herein include
antibodies having all types of constant regions, including IgM,
IgG, IgD, IgA and IgE, and any isotype, including IgG1, IgG2, IgG3
and IgG4. An example of a suitable heavy chain Fc region is a human
isotype IgG1 Fc. In some cases, the heavy chain region is of the
isotype IgG4. In some of these embodiments, the hinge region
comprises an S241P substitution. See, e.g., Angal et al. (1993)
Mol. Immunol. 30:105. Light chain constant regions can be lambda or
kappa. A subject antibody (e.g., a subject humanized antibody) can
comprise sequences from more than one class or isotype. Antibodies
can be expressed as tetramers containing two light and two heavy
chains, as separate heavy chains, light chains, as Fab, Fab'
F(ab')2, and Fv, or as single chain antibodies in which heavy and
light chain variable domains are linked through a spacer.
[0224] In some embodiments, the present disclosure provides an
isolated antibody, wherein the isolated antibody comprises a human
light chain constant region and a human heavy chain constant
region, and wherein the isolated antibody competes for binding to
an epitope in an N-terminal region of a Tau polypeptide with an
antibody that comprises: a) a light chain region comprising: i) a
V.sub.L CDR1 comprising an amino acid sequence of SEQ ID NO:1 or
SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino acid sequence
of SEQ ID NO:2 or SEQ ID NO:8; and (iii) a V.sub.L CDR3 comprising
an amino acid sequence of SEQ ID NO:3 or SEQ ID NO:9; and b) a
heavy chain region comprising: (i) a V.sub.H CDR1 comprising an
amino acid sequence of SEQ ID NO:4 or SEQ ID NO:10; (ii) a V.sub.H
CDR2 comprising an amino acid sequence of SEQ ID NO:5 or SEQ ID
NO:11; and (iii) a V.sub.H CDR3 comprising an amino acid sequence
of SEQ ID NO:6 or SEQ ID NO:12. In some of these embodiments, the
isolated antibody comprises one, two, three, or four humanized VL
framework regions, as described above. In some of these
embodiments, the isolated antibody comprises one, two, three, or
four humanized VH framework regions, as described above.
[0225] A subject antibody can comprise a free thiol (--SH) group at
the carboxyl terminus, where the free thiol group can be used to
attach the antibody to a second polypeptide (e.g., another
antibody, including a subject antibody), a scaffold, a carrier,
etc.
[0226] In some embodiments, a subject antibody comprises one or
more non-naturally occurring amino acids. In some embodiments, the
non-naturally encoded amino acid comprises a carbonyl group, an
acetyl group, an aminooxy group, a hydrazine group, a hydrazide
group, a semicarbazide group, an azide group, or an alkyne group.
See, e.g., U.S. Pat. No. 7,632,924 for suitable non-naturally
occurring amino acids. Inclusion of a non-naturally occurring amino
acid can provide for linkage to a polymer, a second polypeptide, a
scaffold, etc. For example, a subject antibody linked to a
water-soluble polymer can be made by reacting a water-soluble
polymer (e.g., PEG) that comprises a carbonyl group to the
antibody, where the antibody comprises a non-naturally encoded
amino acid that comprises an aminooxy, hydrazine, hydrazide or
semicarbazide group. As another example, a subject antibody linked
to a water-soluble polymer can be made by reacting a subject
antibody that comprises an alkyne-containing amino acid with a
water-soluble polymer (e.g., PEG) that comprises an azide moiety;
in some embodiments, the azide or alkyne group is linked to the PEG
molecule through an amide linkage. A "non-naturally encoded amino
acid" refers to an amino acid that is not one of the 20 common
amino acids or pyrrolysine or selenocysteine. Other terms that may
be used synonymously with the term "non-naturally encoded amino
acid" are "non-natural amino acid," "unnatural amino acid,"
"non-naturally-occurring amino acid," and variously hyphenated and
non-hyphenated versions thereof. The term "non-naturally encoded
amino acid" also includes, but is not limited to, amino acids that
occur by modification (e.g. post-translational modifications) of a
naturally encoded amino acid (including but not limited to, the 20
common amino acids or pyrrolysine and selenocysteine) but are not
themselves naturally incorporated into a growing polypeptide chain
by the translation complex. Examples of such
non-naturally-occurring amino acids include, but are not limited
to, N-acetylglucosaminyl-L-serine,
N-acetylglucosaminyl-L-threonine, and O-phosphotyrosine.
[0227] In some embodiments, a subject antibody is linked (e.g.,
covalently linked) to a polymer (e.g., a polymer other than a
polypeptide). Suitable polymers include, e.g., biocompatible
polymers, and water-soluble biocompatible polymers. Suitable
polymers include synthetic polymers and naturally-occurring
polymers. Suitable polymers include, e.g., substituted or
unsubstituted straight or branched chain polyalkylene,
polyalkenylene or polyoxyalkylene polymers or branched or
unbranched polysaccharides, e.g. a homo- or hetero-polysaccharide.
Suitable polymers include, e.g., ethylene vinyl alcohol copolymer
(commonly known by the generic name EVOH or by the trade name
EVAL); polybutylmethacrylate; poly(hydroxyvalerate); poly(L-lactic
acid); polycaprolactone; poly(lactide-co-glycolide);
poly(hydroxybutyrate); poly(hydroxybutyrate-co-valerate);
polydioxanone; polyorthoester; polyanhydride; poly(glycolic acid);
poly(D,L-lactic acid); poly(glycolic acid-co-trimethylene
carbonate); polyphosphoester; polyphosphoester urethane; poly(amino
acids); cyanoacrylates; poly(trimethylene carbonate);
poly(iminocarbonate); copoly(ether-esters) (e.g., poly(ethylene
oxide)-poly(lactic acid) (PEO/PLA) co-polymers); polyalkylene
oxalates; polyphosphazenes; biomolecules, such as fibrin,
fibrinogen, cellulose, starch, collagen and hyaluronic acid;
polyurethanes; silicones; polyesters; polyolefins; polyisobutylene
and ethylene-alphaolefin copolymers; acrylic polymers and
copolymers; vinyl halide polymers and copolymers, such as polyvinyl
chloride; polyvinyl ethers, such as polyvinyl methyl ether;
polyvinylidene halides, such as polyvinylidene fluoride and
polyvinylidene chloride; polyacrylonitrile; polyvinyl ketones;
polyvinyl aromatics, such as polystyrene; polyvinyl esters, such as
polyvinyl acetate; copolymers of vinyl monomers with each other and
olefins, such as ethylene-methyl methacrylate copolymers,
acrylonitrile-styrene copolymers, ABS resins, and ethylene-vinyl
acetate copolymers; polyamides, such as Nylon 66 and
polycaprolactam; alkyd resins; polycarbonates; polyoxymethylenes;
polyimides; polyethers; epoxy resins; polyurethanes; rayon;
rayon-triacetate; cellulose; cellulose acetate; cellulose butyrate;
cellulose acetate butyrate; cellophane; cellulose nitrate;
cellulose propionate; cellulose ethers; amorphous Teflon;
poly(ethylene glycol); and carboxymethyl cellulose.
[0228] Suitable synthetic polymers include unsubstituted and
substituted straight or branched chain poly(ethyleneglycol),
poly(propyleneglycol) poly(vinylalcohol), and derivatives thereof,
e.g., substituted poly(ethyleneglycol) such as
methoxypoly(ethyleneglycol), and derivatives thereof. Suitable
naturally-occurring polymers include, e.g., albumin, amylose,
dextran, glycogen, and derivatives thereof.
[0229] Suitable polymers can have an average molecular weight in a
range of from 500 Da to 50000 Da, e.g., from 5000 Da to 40000 Da,
or from 25000 to 40000 Da. For example, in some embodiments, where
a subject antibody comprises a poly(ethylene glycol) (PEG) or
methoxypoly(ethyleneglycol) polymer, the PEG or
methoxypoly(ethyleneglycol) polymer can have a molecular weight in
a range of from about 0.5 kiloDaltons (kDa) to 1 kDa, from about 1
kDa to 5 kDa, from 5 kDa to 10 kDa, from 10 kDa to 25 kDa, from 25
kDa to 40 kDa, or from 40 kDa to 60 kDa.
[0230] As noted above, in some embodiments, a subject antibody is
covalently linked to a PEG polymer. In some embodiments, a subject
scFv multimer is covalently linked to a PEG polymer. See, e.g.,
Albrecht et al. (2006) J. Immunol. Methods 310:100. Methods and
reagents suitable for PEGylation of a protein are well known in the
art and may be found in, e.g., U.S. Pat. No. 5,849,860. PEG
suitable for conjugation to a protein is generally soluble in water
at room temperature, and has the general formula
R(O--CH.sub.2--CH.sub.2).sub.nO--R, where R is hydrogen or a
protective group such as an alkyl or an alkanol group, and where n
is an integer from 1 to 1000. Where R is a protective group, it
generally has from 1 to 8 carbons.
[0231] The PEG conjugated to the subject antibody can be linear.
The PEG conjugated to the subject protein may also be branched.
Branched PEG derivatives such as those described in U.S. Pat. No.
5,643,575, "star-PEG's" and multi-armed PEG's such as those
described in Shearwater Polymers, Inc. catalog "Polyethylene Glycol
Derivatives 1997-1998." Star PEGs are described in the art
including, e.g., in U.S. Pat. No. 6,046,305.
[0232] A subject antibody can be glycosylated, e.g., a subject
antibody can comprise a covalently linked carbohydrate or
polysaccharide moiety. Glycosylation of antibodies is typically
either N-linked or O-linked N-linked refers to the attachment of
the carbohydrate moiety to the side chain of an asparagine residue.
The tripeptide sequences asparagine-X-serine and
asparagine-X-threonine, where X is any amino acid except proline,
are the recognition sequences for enzymatic attachment of the
carbohydrate moiety to the asparagine side chain. Thus, the
presence of either of these tripeptide sequences in a polypeptide
creates a potential glycosylation site. O-linked glycosylation
refers to the attachment of one of the sugars
N-acetylgalactosamine, galactose, or xylose to a hydroxyamino acid,
most commonly serine or threonine, although 5-hydroxyproline or
5-hydroxylysine may also be used.
[0233] Addition of glycosylation sites to an antibody is
conveniently accomplished by altering the amino acid sequence such
that it contains one or more of the above-described tripeptide
sequences (for N-linked glycosylation sites). The alteration may
also be made by the addition of, or substitution by, one or more
serine or threonine residues to the sequence of the original
antibody (for O-linked glycosylation sites). Similarly, removal of
glycosylation sites can be accomplished by amino acid alteration
within the native glycosylation sites of an antibody.
[0234] A subject antibody will in some embodiments comprise a
"radiopaque" label, e.g. a label that can be easily visualized
using for example x-rays. Radiopaque materials are well known to
those of skill in the art. The most common radiopaque materials
include iodide, bromide or barium salts. Other radiopaque materials
are also known and include, but are not limited to organic bismuth
derivatives (see, e.g., U.S. Pat. No. 5,939,045), radiopaque
multiurethanes (see U.S. Pat. No. 5,346,981), organobismuth
composites (see, e.g., U.S. Pat. No. 5,256,334), radiopaque barium
multimer complexes (see, e.g., U.S. Pat. No. 4,866,132), and the
like.
[0235] A subject antibody can be covalently linked to a second
moiety (e.g., a lipid, a polypeptide other than a subject antibody,
a synthetic polymer, a carbohydrate, and the like) using for
example, glutaraldehyde, a homobifunctional cross-linker, or a
heterobifunctional cross-linker Glutaraldehyde cross-links
polypeptides via their amino moieties. Homobifunctional
cross-linkers (e.g., a homobifunctional imidoester, a
homobifunctional N-hydroxysuccinimidyl (NHS) ester, or a
homobifunctional sulfhydryl reactive cross-linker) contain two or
more identical reactive moieties and can be used in a one-step
reaction procedure in which the cross-linker is added to a solution
containing a mixture of the polypeptides to be linked
Homobifunctional NHS ester and imido esters cross-link amine
containing polypeptides. In a mild alkaline pH, imido esters react
only with primary amines to form imidoamides, and overall charge of
the cross-linked polypeptides is not affected. Homobifunctional
sulfhydryl reactive cross-linkers includes bismaleimidhexane (BMH),
1,5-difluoro-2,4-dinitrobenzene (DFDNB), and
1,4-di-(3',2'-pyridyldithio)propinoamido butane (DPDPB).
[0236] Heterobifunctional cross-linkers have two or more different
reactive moieties (e.g., amine reactive moiety and a
sulfhydryl-reactive moiety) and are cross-linked with one of the
polypeptides via the amine or sulfhydryl reactive moiety, then
reacted with the other polypeptide via the non-reacted moiety.
Multiple heterobifunctional haloacetyl cross-linkers are available,
as are pyridyl disulfide cross-linkers. Carbodiimides are a classic
example of heterobifunctional cross-linking reagents for coupling
carboxyls to amines, which results in an amide bond.
[0237] A subject antibody can be immobilized on a solid support.
Suitable supports are well known in the art and comprise, inter
alia, commercially available column materials, polystyrene beads,
latex beads, magnetic beads, colloid metal particles, glass and/or
silicon chips and surfaces, nitrocellulose strips, nylon membranes,
sheets, duracytes, wells of reaction trays (e.g., multi-well
plates), plastic tubes, etc. A solid support can comprise any of a
variety of substances, including, e.g., glass, polystyrene,
polyvinyl chloride, polypropylene, polyethylene, polycarbonate,
dextran, nylon, amylose, natural and modified celluloses,
polyacrylamides, agaroses, and magnetite. Suitable methods for
immobilizing a subject antibody onto a solid support are well known
and include, but are not limited to ionic, hydrophobic, covalent
interactions and the like. Solid supports can be soluble or
insoluble, e.g., in aqueous solution. In some embodiments, a
suitable solid support is generally insoluble in an aqueous
solution.
[0238] A subject antibody will in some embodiments comprise a
detectable label. Suitable detectable labels include any
composition detectable by spectroscopic, photochemical,
biochemical, immunochemical, electrical, optical or chemical means.
Suitable include, but are not limited to, magnetic beads (e.g.
Dynabeads.TM.), fluorescent dyes (e.g., fluorescein isothiocyanate,
texas red, rhodamine, a green fluorescent protein, a red
fluorescent protein, a yellow fluorescent protein, and the like),
radiolabels (e.g., .sup.3H, .sup.125I, .sup.35S, .sup.14C, or
.sup.32P), enzymes (e.g., horse radish peroxidase, alkaline
phosphatase, luciferase, and others commonly used in an
enzyme-linked immunosorbent assay (ELISA)), and colorimetric labels
such as colloidal gold or colored glass or plastic (e.g.
polystyrene, polypropylene, latex, etc.) beads.
[0239] In some embodiments, a subject antibody comprises a contrast
agent or a radioisotope, where the contrast agent or radioisotope
is one that is suitable for use in imaging, e.g., imaging
procedures carried out on humans. Non-limiting examples of labels
include radioisotope such as .sup.1231I (iodine), .sup.18F
(fluorine), .sup.99Tc (technetium), .sup.111In (indium), and
.sup.67Ga (gallium), and contrast agent such as gadolinium (Gd),
dysprosium, and iron. Radioactive Gd isotopes (.sup.153Gd) also are
available and suitable for imaging procedures in non-human mammals.
A subject antibody can be labeled using standard techniques. For
example, a subject antibody can be iodinated using chloramine T or
1,3,4,6-tetrachloro-3.alpha.,6.alpha.-diphenylglycouril. For
fluorination, fluorine is added to a subject antibody during the
synthesis by a fluoride ion displacement reaction. See,
Muller-Gartner, H., TIB Tech., 16:122-130 (1998) and Saji, H.,
Crit. Rev. Ther. Drug Carrier Syst., 16(2):209-244 (1999) for a
review of synthesis of proteins with such radioisotopes. A subject
antibody can also be labeled with a contrast agent through standard
techniques. For example, a subject antibody can be labeled with Gd
by conjugating low molecular Gd chelates such as Gd diethylene
triamine pentaacetic acid (GdDTPA) or Gd
tetraazacyclododecanetetraacetic (GdDOTA) to the antibody. See,
Caravan et al., Chem. Rev. 99:2293-2352 (1999) and Lauffer et al.,
J. Magn. Reson. Imaging, 3:11-16 (1985). A subject antibody can be
labeled with Gd by, for example, conjugating polylysine-Gd chelates
to the antibody. See, for example, Curtet et al., Invest. Radiol.,
33(10):752-761 (1998). Alternatively, a subject antibody can be
labeled with Gd by incubating paramagnetic polymerized liposomes
that include Gd chelator lipid with avidin and biotinylated
antibody. See, for example, Sipkins et al., Nature Med., 4:623-626
(1998).
[0240] Suitable fluorescent proteins that can be linked to a
subject antibody include, but are not limited to, a green
fluorescent protein from Aequoria victoria or a mutant or
derivative thereof e.g., as described in U.S. Pat. Nos. 6,066,476;
6,020,192; 5,985,577; 5,976,796; 5,968,750; 5,968,738; 5,958,713;
5,919,445; 5,874,304; e.g., Enhanced GFP, many such GFP which are
available commercially, e.g., from Clontech, Inc.; a red
fluorescent protein; a yellow fluorescent protein; any of a variety
of fluorescent and colored proteins from Anthozoan species, as
described in, e.g., Matz et al. (1999) Nature Biotechnol.
17:969-973; and the like.
[0241] A subject antibody will in some embodiments be linked to
(e.g., covalently or non-covalently linked) a fusion partner, e.g.,
a ligand; an epitope tag; a peptide; a protein other than an
antibody; and the like. Suitable fusion partners include peptides
and polypeptides that confer enhanced stability in vivo (e.g.,
enhanced serum half-life); provide ease of purification, e.g.,
(His).sub.n, e.g., 6His, and the like; provide for secretion of the
fusion protein from a cell; provide an epitope tag, e.g., GST,
hemagglutinin (HA; e.g., YPYDVPDYA; SEQ ID NO:71), FLAG (e.g.,
DYKDDDDK; SEQ ID NO:69), c-myc (e.g., EQKLISEEDL; SEQ ID NO:68),
and the like; provide a detectable signal, e.g., an enzyme that
generates a detectable product (e.g., (3-galactosidase,
luciferase), or a protein that is itself detectable, e.g., a green
fluorescent protein, a red fluorescent protein, a yellow
fluorescent protein, etc.; provides for multimerization, e.g., a
multimerization domain such as an Fc portion of an immunoglobulin;
and the like.
[0242] The fusion may also include an affinity domain, including
peptide sequences that can interact with a binding partner, e.g.,
such as one immobilized on a solid support, useful for
identification or purification. Consecutive single amino acids,
such as histidine, when fused to a protein, can be used for
one-step purification of the fusion protein by high affinity
binding to a resin column, such as nickel sepharose. Exemplary
affinity domains include His5 (HHHHH) (SEQ ID NO:66), His X6
(HHHHHH) (SEQ ID NO:67), C-myc (EQKLISEEDL) (SEQ ID NO:68), Flag
(DYKDDDDK) (SEQ ID NO:69), StrepTag (WSHPQFEK) (SEQ ID NO:70),
hemagglutinin, e.g., HA Tag (YPYDVPDYA; SEQ ID NO:71),
glutathinone-S-transferase (GST), thioredoxin, cellulose binding
domain, RYIRS (SEQ ID NO:72), Phe-His-His-Thr (SEQ ID NO:73),
chitin binding domain, S-peptide, T7 peptide, SH2 domain, C-end RNA
tag, WEAAAREACCRECCARA (SEQ ID NO:74), metal binding domains, e.g.,
zinc binding domains or calcium binding domains such as those from
calcium-binding proteins, e.g., calmodulin, troponin C, calcineurin
B, myosin light chain, recoverin, S-modulin, visinin, VILIP,
neurocalcin, hippocalcin, frequenin, caltractin, calpain
large-subunit, 5100 proteins, parvalbumin, calbindin D9K, calbindin
D28K, and calretinin, inteins, biotin, streptavidin, MyoD, leucine
zipper sequences, and maltose binding protein.
[0243] A subject antibody will in some embodiments be fused to a
polypeptide that binds to an endogenous blood brain barrier (BBB)
receptor. Linking a subject antibody to a polypeptide that binds to
an endogenous BBB receptor facilitates crossing the BBB, e.g., in a
subject treatment method (see below) involving administration of a
subject antibody to an individual in need thereof. Suitable
polypeptides that bind to an endogenous BBB receptor include
antibodies, e.g., monoclonal antibodies, or antigen-binding
fragments thereof, that specifically bind to an endogenous BBB
receptor. Suitable endogenous BBB receptors include, but are not
limited to, an insulin receptor, a transferrin receptor, a leptin
receptor, a lipoprotein receptor, and an insulin-like growth factor
receptor. See, e.g., U.S. Patent Publication No. 2009/0156498.
[0244] As an example, a subject anti-Tau antibody can be a
bi-specific antibody comprising a first antigen-binding portion
that specifically binds an epitope in a Tau polypeptide (e.g., a
linear epitope within an amino-terminal (N-terminal) portion of
Tau, e.g., within amino acids 1-25 of Tau, within amino acids 1-18
of Tau, or within amino acids 9 to 18 of Tau); and a second
antigen-binding portion that binds an endogenous BBB receptor. For
example, in some instances, a subject anti-Tau antibody is a
bi-specific antibody comprising a first antigen-binding portion
that specifically binds an epitope in a Tau polypeptide (e.g., a
linear epitope within an amino-terminal (N-terminal) portion of
Tau, e.g., within amino acids 1-25 of Tau, within amino acids 1-18
of Tau, or within amino acids 9 to 18 of Tau); and a second
antigen-binding portion that binds a transferrin receptor.
[0245] For example, an anti-Tau antibody of the present disclosure
can be fused to a peptide that facilitates crossing the BBB, the
peptide having a length of from about 15 amino acids to about 25
amino acids, and comprising an amino acid sequence having at least
about 85% amino acid sequence identity to one of the following
peptides: Angiopep-1 (TFFYGGCRGKRNNFKTEEY; SEQ ID NO:75);
Angiopep-2 (TFFYGGSRGKRNNFKTEEY; SEQ ID NO:76); cys-Angiopep-2
(CTFFYGGSRGKRNNFKTEEY; SEQ ID NO:77); Angiopep-2-cys
(TFFYGGSRGKRNNFKTEEYC; SEQ ID NO:78); and an aprotinin fragment
(TFVYGGCRAKRNNFKS; SEQ ID NO:79). See, e.g., U.S. Patent
Publication Nos. 2011/0288011; and 2009/0016959. A peptide that
facilitates crossing the BBB can be fused to the N-terminus of an
anti-Tau light chain region, to the C-terminus of an anti-Tau light
chain region, to the N-terminus of an anti-Tau heavy chain region,
to the C-terminus of an anti-Tau heavy chain region, to the
N-terminus of a subject anti-Tau single-chain antibody, to the
C-terminus of a subject anti-Tau single-chain antibody, etc.
[0246] In some embodiments, a subject antibody comprises a
polyamine modification. Polyamine modification of a subject
antibody enhances permeability of the modified antibody at the BBB.
A subject antibody can be modified with polyamines that are either
naturally occurring or synthetic. See, for example, U.S. Pat. No.
5,670,477. Useful naturally occurring polyamines include
putrescine, spermidine, spermine, 1,3-diaminopropane,
norspermidine, syn-homospermidine, thermine, thermospermine,
caldopentamine, homocaldopentamine, and canavalmine. Putrescine,
spermidine and spermine are particularly useful. Synthetic
polyamines are composed of the empirical formula
C.sub.XH.sub.YN.sub.Z, can be cyclic or acyclic, branched or
unbranched, hydrocarbon chains of 3-12 carbon atoms that further
include 1-6 NR or N(R).sub.2 moieties, wherein R is H,
(C.sub.1-C.sub.4) alkyl, phenyl, or benzyl. Polyamines can be
linked to an antibody using any standard crosslinking method.
[0247] In some embodiments, a subject antibody is modified to
include a carbohydrate moiety, where the carbohydrate moiety can be
covalently linked to the antibody. In some embodiments, a subject
antibody is modified to include a lipid moiety, where the lipid
moiety can be covalently linked to the antibody. Suitable lipid
moieties include, e.g., an N-fatty acyl group such as N-lauroyl,
N-oleoyl, etc.; a fatty amine such as dodecyl amine, oleoyl amine,
etc.; a C3-C16 long-chain aliphatic lipid; and the like. See, e.g.,
U.S. Pat. No. 6,638,513). In some embodiments, a subject antibody
is incorporated into a liposome.
Methods of Producing a Subject Antibody
[0248] A subject antibody can be produced by any known method,
e.g., conventional synthetic methods for protein synthesis;
recombinant DNA methods; etc.
[0249] Where a subject antibody is a single chain polypeptide, it
can be synthesized using standard chemical peptide synthesis
techniques. Where a polypeptide is chemically synthesized, the
synthesis may proceed via liquid-phase or solid-phase. Solid phase
polypeptide synthesis (SPPS), in which the C-terminal amino acid of
the sequence is attached to an insoluble support followed by
sequential addition of the remaining amino acids in the sequence,
is an example of a suitable method for the chemical synthesis of a
subject antibody. Various forms of SPPS, such as Fmoc and Boc, are
available for synthesizing a subject antibody. Techniques for solid
phase synthesis are described by Barany and Merrifield, Solid-Phase
Peptide Synthesis; pp. 3-284 in The Peptides Analysis, Synthesis,
Biology. Vol. 2: Special Methods in Peptide Synthesis, Part A.,
Merrifield, et al. J. Am. Chem. Soc., 85: 2149-2156 (1963); Stewart
et al., Solid Phase Peptide Synthesis, 2nd ed. Pierce Chem. Co.,
Rockford, Ill. (1984); and Ganesan A. 2006 Mini Rev. Med. Chem.
6:3-10 and Camarero J A et al. 2005 Protein Pept Lett. 12:723-8.
Briefly, small insoluble, porous beads are treated with functional
units on which peptide chains are built. After repeated cycling of
coupling/deprotection, the free N-terminal amine of a solid-phase
attached is coupled to a single N-protected amino acid unit. This
unit is then deprotected, revealing a new N-terminal amine to which
a further amino acid may be attached. The peptide remains
immobilized on the solid-phase and undergoes a filtration process
before being cleaved off.
[0250] Standard recombinant methods can be used for production of a
subject antibody. For example, nucleic acids encoding light and
heavy chain variable regions, optionally linked to constant
regions, are inserted into expression vectors. The light and heavy
chains can be cloned in the same or different expression vectors.
The DNA segments encoding immunoglobulin chains are operably linked
to control sequences in the expression vector(s) that ensure the
expression of immunoglobulin polypeptides. Expression control
sequences include, but are not limited to, promoters (e.g.,
naturally-associated or heterologous promoters), signal sequences,
enhancer elements, and transcription termination sequences. The
expression control sequences can be eukaryotic promoter systems in
vectors capable of transforming or transfecting eukaryotic host
cells (e.g., COS or CHO cells). Once the vector has been
incorporated into the appropriate host, the host is maintained
under conditions suitable for high level expression of the
nucleotide sequences, and the collection and purification of the
antibodies.
[0251] Because of the degeneracy of the code, a variety of nucleic
acid sequences can encode each immunoglobulin amino acid sequence.
The desired nucleic acid sequences can be produced by de novo
solid-phase DNA synthesis or by polymerase chain reaction (PCR)
mutagenesis of an earlier prepared variant of the desired
polynucleotide. Oligonucleotide-mediated mutagenesis is an example
of a suitable method for preparing substitution, deletion and
insertion variants of target polypeptide DNA. See Adelman et al.,
DNA 2:183 (1983). Briefly, the target polypeptide DNA is altered by
hybridizing an oligonucleotide encoding the desired mutation to a
single-stranded DNA template. After hybridization, a DNA polymerase
is used to synthesize an entire second complementary strand of the
template that incorporates the oligonucleotide primer, and encodes
the selected alteration in the target polypeptide DNA.
[0252] Suitable expression vectors are typically replicable in the
host organisms either as episomes or as an integral part of the
host chromosomal DNA. Commonly, expression vectors contain
selection markers (e.g., ampicillin-resistance,
hygromycin-resistance, tetracycline resistance, kanamycin
resistance or neomycin resistance) to permit detection of those
cells transformed with the desired DNA sequences.
[0253] Escherichia coli is an example of a prokaryotic host cell
that can be used for cloning a subject antibody-encoding
polynucleotide. Other microbial hosts suitable for use include
bacilli, such as Bacillus subtilis, and other enterobacteriaceae,
such as Salmonella, Serratia, and various Pseudomonas species. In
these prokaryotic hosts, one can also make expression vectors,
which will typically contain expression control sequences
compatible with the host cell (e.g., an origin of replication). In
addition, any number of a variety of well-known promoters will be
present, such as the lactose promoter system, a tryptophan (trp)
promoter system, a beta-lactamase promoter system, or a promoter
system from phage lambda. The promoters will typically control
expression, optionally with an operator sequence, and have ribosome
binding site sequences and the like, for initiating and completing
transcription and translation.
[0254] Other microbes, such as yeast, are also useful for
expression. Saccharomyces (e.g., S. cerevisiae) and Pichia are
examples of suitable yeast host cells, with suitable vectors having
expression control sequences (e.g., promoters), an origin of
replication, termination sequences and the like as desired. Typical
promoters include 3-phosphoglycerate kinase and other glycolytic
enzymes. Inducible yeast promoters include, among others, promoters
from alcohol dehydrogenase, isocytochrome C, and enzymes
responsible for maltose and galactose utilization.
[0255] In addition to microorganisms, mammalian cells (e.g.,
mammalian cells grown in in vitro cell culture) can also be used to
express and produce an anti-tau antibody of the present disclosure
(e.g., polynucleotides encoding a subject anti-Tau antibody). See
Winnacker, From Genes to Clones, VCH Publishers, N.Y., N.Y. (1987).
Suitable mammalian host cells include CHO cell lines, various Cos
cell lines, HeLa cells, myeloma cell lines, and transformed B-cells
or hybridomas. Expression vectors for these cells can include
expression control sequences, such as an origin of replication, a
promoter, and an enhancer (Queen et al., Immunol. Rev. 89:49
(1986)), and necessary processing information sites, such as
ribosome binding sites, RNA splice sites, polyadenylation sites,
and transcriptional terminator sequences. Examples of suitable
expression control sequences are promoters derived from
immunoglobulin genes, SV40, adenovirus, bovine papilloma virus,
cytomegalovirus and the like. See Co et al., J. Immunol. 148:1149
(1992).
[0256] Once synthesized (either chemically or recombinantly), the
whole antibodies, their dimers, individual light and heavy chains,
or other forms of a subject antibody (e.g., scFv, etc.) can be
purified according to standard procedures of the art, including
ammonium sulfate precipitation, affinity columns, column
chromatography, high performance liquid chromatography (HPLC)
purification, gel electrophoresis, and the like (see generally
Scopes, Protein Purification (Springer-Verlag, N.Y., (1982)). A
subject antibody can be substantially pure, e.g., at least about
80% to 85% pure, at least about 85% to 90% pure, at least about 90%
to 95% pure, or 98% to 99%, or more, pure, e.g., free from
contaminants such as cell debris, macromolecules other than a
subject antibody, etc.
Compositions
[0257] The present disclosure provides a composition comprising a
subject antibody. A subject antibody composition can comprise, in
addition to a subject antibody, one or more of: a salt, e.g., NaCl,
MgCl.sub.2, KCl, MgSO.sub.4, etc.; a buffering agent, e.g., a Tris
buffer, N-(2-Hydroxyethyl)piperazine-N'-(2-ethanesulfonic acid)
(HEPES), 2-(N-Morpholino)ethanesulfonic acid (MES),
2-(N-Morpholino)ethanesulfonic acid sodium salt (MES),
3-(N-Morpholino)propanesulfonic acid (MOPS),
N-tris[Hydroxymethyl]methyl-3-aminopropanesulfonic acid (TAPS),
etc.; a solubilizing agent; a detergent, e.g., a non-ionic
detergent such as Tween-20, etc.; a protease inhibitor; glycerol;
and the like.
Nucleic Acids, Expression Vectors, and Host Cells
[0258] The present disclosure provides nucleic acids comprising
nucleotide sequences encoding a subject anti-Tau antibody.
[0259] A nucleotide sequence encoding subject anti-Tau antibody can
comprise a nucleotide sequence encoding a light chain variable
region and having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%,
93%, 94%, 95%, 96%, 97%, 98% or 99% nucleotide sequence identity to
the nucleotide sequence depicted in FIG. 1B and set forth in SEQ ID
NO:17.
[0260] A nucleotide sequence encoding subject anti-Tau antibody can
comprise a nucleotide sequence encoding a heavy chain variable
region and having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%,
93%, 94%, 95%, 96%, 97%, 98% or 99% nucleotide sequence identity to
the nucleotide sequence depicted in FIG. 1A and set forth in SEQ ID
NO:18.
[0261] A nucleotide sequence encoding subject anti-Tau antibody can
comprise a nucleotide sequence encoding a light chain variable
region and having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%,
93%, 94%, 95%, 96%, 97%, 98% or 99% nucleotide sequence identity to
the nucleotide sequence depicted in FIG. 2B and set forth in SEQ ID
NO:19.
[0262] A nucleotide sequence encoding subject anti-Tau antibody can
comprise a nucleotide sequence encoding a heavy chain variable
region and having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%,
93%, 94%, 95%, 96%, 97%, 98% or 99% nucleotide sequence identity to
the nucleotide sequence depicted in FIG. 2A and set forth in SEQ ID
NO:20.
[0263] A nucleotide sequence encoding a subject antibody can be
operably linked to one or more regulatory elements, such as a
promoter and enhancer, that allow expression of the nucleotide
sequence in the intended target cells (e.g., a cell that is
genetically modified to synthesize the encoded antibody).
[0264] Suitable promoter and enhancer elements are known in the
art. For expression in a bacterial cell, suitable promoters
include, but are not limited to, lacI, lacZ, T3, T7, gpt, lambda P
and trc. For expression in a eukaryotic cell, suitable promoters
include, but are not limited to, light and/or heavy chain
immunoglobulin gene promoter and enhancer elements; cytomegalovirus
immediate early promoter; herpes simplex virus thymidine kinase
promoter; early and late SV40 promoters; promoter present in long
terminal repeats from a retrovirus; mouse metallothionein-I
promoter; and various art-known tissue specific promoters.
[0265] In some embodiments, e.g., for expression in a yeast cell, a
suitable promoter is a constitutive promoter such as an ADH1
promoter, a PGK1 promoter, an ENO promoter, a PYK1 promoter and the
like; or a regulatable promoter such as a GAL1 promoter, a GAL10
promoter, an ADH2 promoter, a PHO5 promoter, a CUP1 promoter, a
GAL7 promoter, a MET25 promoter, a MET3 promoter, a CYC1 promoter,
a HIS3 promoter, an ADH1 promoter, a PGK promoter, a GAPDH
promoter, an ADC1 promoter, a TRP1 promoter, a URA3 promoter, a
LEU2 promoter, an ENO promoter, a TP1 promoter, and AOX1 (e.g., for
use in Pichia). Selection of the appropriate vector and promoter is
well within the level of ordinary skill in the art.
[0266] Suitable promoters for use in prokaryotic host cells
include, but are not limited to, a bacteriophage T7 RNA polymerase
promoter; a trp promoter; a lac operon promoter; a hybrid promoter,
e.g., a lac/tac hybrid promoter, a tac/trc hybrid promoter, a
trp/lac promoter, a T7/lac promoter; a trc promoter; a tac
promoter, and the like; an araBAD promoter; in vivo regulated
promoters, such as an ssaG promoter or a related promoter (see,
e.g., U.S. Patent Publication No. 20040131637), a pagC promoter
(Pulkkinen and Miller, J. Bacteriol., 1991: 173(1): 86-93;
Alpuche-Aranda et al., PNAS, 1992; 89(21): 10079-83), a nirB
promoter (Harborne et al. (1992) Mol. Micro. 6:2805-2813), and the
like (see, e.g., Dunstan et al. (1999) Infect. Immun. 67:5133-5141;
McKelvie et al. (2004) Vaccine 22:3243-3255; and Chatfield et al.
(1992) Biotechnol. 10:888-892); a sigma70 promoter, e.g., a
consensus sigma70 promoter (see, e.g., GenBank Accession Nos.
AX798980, AX798961, and AX798183); a stationary phase promoter,
e.g., a dps promoter, an spy promoter, and the like; a promoter
derived from the pathogenicity island SPI-2 (see, e.g.,
WO96/17951); an actA promoter (see, e.g., Shetron-Rama et al.
(2002) Infect. Immun. 70:1087-1096); an rpsM promoter (see, e.g.,
Valdivia and Falkow (1996). Mol. Microbiol. 22:367); a tet promoter
(see, e.g., Hillen, W. and Wissmann, A. (1989) In Saenger, W. and
Heinemann, U. (eds), Topics in Molecular and Structural Biology,
Protein-Nucleic Acid Interaction. Macmillan, London, UK, Vol. 10,
pp. 143-162); an SP6 promoter (see, e.g., Melton et al. (1984)
Nucl. Acids Res. 12:7035); and the like. Suitable strong promoters
for use in prokaryotes such as Escherichia coli include, but are
not limited to Trc, Tac, T5, T7, and P.sub.Lambda. Non-limiting
examples of operators for use in bacterial host cells include a
lactose promoter operator (Lad repressor protein changes
conformation when contacted with lactose, thereby preventing the
LacI repressor protein from binding to the operator), a tryptophan
promoter operator (when complexed with tryptophan, TrpR repressor
protein has a conformation that binds the operator; in the absence
of tryptophan, the TrpR repressor protein has a conformation that
does not bind to the operator), and a tac promoter operator (see,
for example, deBoer et al. (1983) Proc. Natl. Acad. Sci. U.S.A.
80:21-25).
[0267] A nucleotide sequence encoding a subject antibody can be
present in an expression vector and/or a cloning vector. Where a
subject antibody comprises two separate polypeptides, nucleotide
sequences encoding the two polypeptides can be cloned in the same
or separate vectors. An expression vector can include a selectable
marker, an origin of replication, and other features that provide
for replication and/or maintenance of the vector.
[0268] Large numbers of suitable vectors and promoters are known to
those of skill in the art; many are commercially available for
generating a subject recombinant constructs. The following vectors
are provided by way of example. Bacterial: pBs, phagescript,
PsiX174, pBluescript SK, pBs KS, pNH8a, pNH16a, pNH18a, pNH46a
(Stratagene, La Jolla, Calif., USA); pTrc99A, pKK223-3, pKK233-3,
pDR540, and pRIT5 (Pharmacia, Uppsala, Sweden). Eukaryotic: pWLneo,
pSV2cat, pOG44, PXR1, pSG (Stratagene) pSVK3, pBPV, pMSG and pSVL
(Pharmacia).
[0269] Expression vectors generally have convenient restriction
sites located near the promoter sequence to provide for the
insertion of nucleic acid sequences encoding heterologous proteins.
A selectable marker operative in the expression host may be
present. Suitable expression vectors include, but are not limited
to, viral vectors (e.g. viral vectors based on vaccinia virus;
poliovirus; adenovirus (see, e.g., Li et al., Invest Opthalmol V is
Sci 35:2543 2549, 1994; Borras et al., Gene Ther 6:515 524, 1999;
Li and Davidson, PNAS 92:7700 7704, 1995; Sakamoto et al., H Gene
Ther 5:1088 1097, 1999; WO 94/12649, WO 93/03769; WO 93/19191; WO
94/28938; WO 95/11984 and WO 95/00655); adeno-associated virus
(see, e.g., Ali et al., Hum Gene Ther 9:8186, 1998, Flannery et
al., PNAS 94:6916 6921, 1997; Bennett et al., Invest Opthalmol V is
Sci 38:2857 2863, 1997; Jomary et al., Gene Ther 4:683 690, 1997,
Rolling et al., Hum Gene Ther 10:641648, 1999; Ali et al., Hum Mol
Genet. 5:591594, 1996; Srivastava in WO 93/09239, Samulski et al.,
J. Vir. (1989) 63:3822-3828; Mendelson et al., Virol. (1988)
166:154-165; and Flotte et al., PNAS (1993) 90:10613-10617); SV40;
herpes simplex virus; human immunodeficiency virus (see, e.g.,
Miyoshi et al., PNAS 94:10319 23, 1997; Takahashi et al., J Virol
73:7812 7816, 1999); a retroviral vector (e.g., Murine Leukemia
Virus, spleen necrosis virus, and vectors derived from retroviruses
such as Rous Sarcoma Virus, Harvey Sarcoma Virus, avian leukosis
virus, human immunodeficiency virus, myeloproliferative sarcoma
virus, and mammary tumor virus); and the like.
[0270] As noted above, a subject nucleic acid comprises a
nucleotide sequence encoding a subject antibody. A subject nucleic
acid can comprise a nucleotide sequence encoding heavy- and
light-chain CDRs of IPN001. In some embodiments, a subject nucleic
acid comprises a nucleotide sequence encoding heavy- and
light-chain CDRs of IPN002, where the CDR-encoding sequences are
interspersed with FR-encoding nucleotide sequences. In some
embodiments, the FR-encoding nucleotide sequences are human
FR-encoding nucleotide sequences.
Host Cells
[0271] The present disclosure provides isolated genetically
modified host cells (e.g., in vitro cells) that are genetically
modified with a subject nucleic acid. In some embodiments, a
subject isolated genetically modified host cell can produce a
subject antibody.
[0272] Suitable host cells include eukaryotic host cells, such as a
mammalian cell, an insect host cell, a yeast cell; and prokaryotic
cells, such as a bacterial cell. Introduction of a subject nucleic
acid into the host cell can be effected, for example by calcium
phosphate precipitation, DEAE dextran mediated transfection,
liposome-mediated transfection, electroporation, or other known
method.
[0273] Suitable mammalian cells include primary cells and
immortalized cell lines. Suitable mammalian cell lines include
human cell lines, non-human primate cell lines, rodent (e.g.,
mouse, rat) cell lines, and the like. Suitable mammalian cell lines
include, but are not limited to, HeLa cells (e.g., American Type
Culture Collection (ATCC) No. CCL-2), CHO cells (e.g., ATCC Nos.
CRL9618, CCL61, CRL9096), 293 cells (e.g., ATCC No. CRL-1573), Vero
cells, NIH 3T3 cells (e.g., ATCC No. CRL-1658), Huh-7 cells, BHK
cells (e.g., ATCC No. CCL10), PC12 cells (ATCC No. CRL1721), COS
cells, COS-7 cells (ATCC No. CRL1651), RAT1 cells, mouse L cells
(ATCC No. CCLI.3), human embryonic kidney (HEK) cells (ATCC No.
CRL1573), HLHepG2 cells, and the like. In some cases, the cells are
HEK cells. In some cases, the cells are CHO cells, e.g., CHO-K1
cells (ATCC No. CCL-61), CHO-M cells, CHO-DG44 cells (ATCC No.
PTA-3356), and the like.
[0274] Suitable yeast cells include, but are not limited to, Pichia
pastoris, Pichia finlandica, Pichia trehalophila, Pichia koclamae,
Pichia membranaefaciens, Pichia opuntiae, Pichia thermotolerans,
Pichia salictaria, Pichia guercuum, Pichia pijperi, Pichia stiptis,
Pichia methanolica, Pichia sp., Saccharomyces cerevisiae,
Saccharomyces sp., Hansenula polymorpha, Kluyveromyces sp.,
Kluyveromyces lactis, Candida albicans, Aspergillus nidulans,
Aspergillus niger, Aspergillus oryzae, Trichoderma reesei,
Chrysosporium lucknowense, Fusarium sp., Fusarium gramineum,
Fusarium venenatum, Neurospora crassa, Chlamydomonas reinhardtii,
and the like.
[0275] Suitable prokaryotic cells include, but are not limited to,
any of a variety of laboratory strains of Escherichia coli,
Lactobacillus sp., and the like. See, e.g., Carrier et al. (1992)
J. Immunol. 148:1176-1181; U.S. Pat. No. 6,447,784; and Sizemore et
al. (1995) Science 270:299-302. Typically, the laboratory strain is
one that is non-pathogenic. Non-limiting examples of other suitable
bacteria include, but are not limited to, Bacillus subtilis, and
the like. In some embodiments, the host cell is Escherichia
coli.
Pharmaceutical Formulations
[0276] The present disclosure provides compositions, including
pharmaceutical compositions, comprising a subject antibody. In
general, a formulation comprises an effective amount of a subject
antibody. An "effective amount" means a dosage sufficient to
produce a desired result, e.g., reduction in an adverse symptom
associated with a tauopathy, amelioration of a symptom of a
tauopathy, slowing progression of a tauopathy, etc. Generally, the
desired result is at least a reduction in a symptom of a tauopathy,
as compared to a control. A subject antibody can be delivered in
such a manner as to avoid the blood-brain barrier, as described in
more detail below. A subject antibody can be formulated and/or
modified to enable the antibody to cross the blood-brain
barrier.
[0277] The present disclosure provides a pharmaceutical formulation
comprising: a) an antibody that specifically binds an epitope
within an N-terminal portion of Tau, wherein the antibody
comprises: (i) a V.sub.L CDR1 comprising an amino acid sequence of
SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino
acid sequence of SEQ ID NO:2 or SEQ ID NO:8; (iii) a V.sub.L CDR3
comprising an amino acid sequence of SEQ ID NO:3 or SEQ ID NO:9;
(iv) a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID
NO:4 or SEQ ID NO:10; (v) a V.sub.H CDR2 comprising an amino acid
sequence of SEQ ID NO:5 or SEQ ID NO:11; and (vi) a V.sub.H CDR3
comprising an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12;
and b) a pharmaceutically acceptable excipient suitable for
administration to a human, wherein the formulation is free of
endotoxins.
[0278] The present disclosure provides a pharmaceutical formulation
comprising: a) an isolated humanized monoclonal antibody that
specifically binds an epitope within amino acids 15-24 of a Tau
polypeptide; and b) a pharmaceutically acceptable excipient, where
in some embodiments the pharmaceutically acceptable excipient is
suitable for administration to a human.
[0279] The present disclosure provides a pharmaceutical formulation
comprising: A) an isolated antibody comprising a humanized light
chain framework region; and a humanized heavy chain framework
region, wherein the isolated antibody competes for binding to an
epitope in an N-terminal region of a Tau polypeptide with an
antibody that comprises: a) a light chain region comprising: i) a
V.sub.L CDR1 comprising an amino acid sequence of SEQ ID NO:1 or
SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino acid sequence
of SEQ ID NO:2 or SEQ ID NO:8; and (iii) a V.sub.L CDR3 comprising
an amino acid sequence of SEQ ID NO:3 or SEQ ID NO:9; and b) a
heavy chain region comprising: (i) a V.sub.H CDR1 comprising an
amino acid sequence of SEQ ID NO:4 or SEQ ID NO:10; (ii) a V.sub.H
CDR2 comprising an amino acid sequence of SEQ ID NO:5 or SEQ ID
NO:11; and (iii) a V.sub.H CDR3 comprising an amino acid sequence
of SEQ ID NO:6 or SEQ ID NO:12; and B) a pharmaceutically
acceptable excipient, where in some embodiments the
pharmaceutically acceptable excipient is suitable for
administration to a human.
[0280] The present disclosure provides a pharmaceutical formulation
comprising: A) an isolated antibody, wherein the antibody is a Fv,
scFv, Fab, F(ab')2, or Fab', and wherein the antibody competes for
binding to an epitope in an N-terminal region of a Tau polypeptide
with an antibody that comprises: a) a light chain region
comprising: i) a V.sub.L CDR1 comprising an amino acid sequence of
SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2 comprising an amino
acid sequence of SEQ ID NO:2 or SEQ ID NO:8; and (iii) a V.sub.L
CDR3 comprising an amino acid sequence of SEQ ID NO:3 or SEQ ID
NO:9; and b) a heavy chain region comprising: (i) a V.sub.H CDR1
comprising an amino acid sequence of SEQ ID NO:4 or SEQ ID NO:10;
(ii) a V.sub.H CDR2 comprising an amino acid sequence of SEQ ID
NO:5 or SEQ ID NO:11; and (iii) a V.sub.H CDR3 comprising an amino
acid sequence of SEQ ID NO:6 or SEQ ID NO:12; and B) a
pharmaceutically acceptable excipient, where in some embodiments
the pharmaceutically acceptable excipient is suitable for
administration to a human.
[0281] The present disclosure provides a pharmaceutical formulation
comprising: A) an isolated antibody, wherein the isolated antibody
comprises a human light chain constant region and a human heavy
chain constant region, and wherein the isolated antibody competes
for binding to an epitope in an N-terminal region of a Tau
polypeptide with an antibody that comprises: a) a light chain
region comprising: i) a V.sub.L CDR1 comprising an amino acid
sequence of SEQ ID NO:1 or SEQ ID NO:7; (ii) a V.sub.L CDR2
comprising an amino acid sequence of SEQ ID NO:2 or SEQ ID NO:8;
and (iii) a V.sub.L CDR3 comprising an amino acid sequence of SEQ
ID NO:3 or SEQ ID NO:9; and b) a heavy chain region comprising: (i)
a V.sub.H CDR1 comprising an amino acid sequence of SEQ ID NO:4 or
SEQ ID NO:10; (ii) a V.sub.H CDR2 comprising an amino acid sequence
of SEQ ID NO:5 or SEQ ID NO:11; and (iii) a V.sub.H CDR3 comprising
an amino acid sequence of SEQ ID NO:6 or SEQ ID NO:12; and B) a
pharmaceutically acceptable excipient, where in some embodiments
the pharmaceutically acceptable excipient is suitable for
administration to a human.
Formulations
[0282] In the subject methods, a subject antibody can be
administered to the host using any convenient means capable of
resulting in the desired therapeutic effect or diagnostic effect.
Thus, the agent can be incorporated into a variety of formulations
for therapeutic administration. More particularly, a subject
antibody can be formulated into pharmaceutical compositions by
combination with appropriate, pharmaceutically acceptable carriers
or diluents, and may be formulated into preparations in solid,
semi-solid, liquid or gaseous forms, such as tablets, capsules,
powders, granules, ointments, solutions, suppositories, injections,
inhalants and aerosols.
[0283] In pharmaceutical dosage forms, a subject antibody can be
administered in the form of their pharmaceutically acceptable
salts, or they may also be used alone or in appropriate
association, as well as in combination, with other pharmaceutically
active compounds. The following methods and excipients are merely
exemplary and are in no way limiting.
[0284] For oral preparations, a subject antibody can be used alone
or in combination with appropriate additives to make tablets,
powders, granules or capsules, for example, with conventional
additives, such as lactose, mannitol, corn starch or potato starch;
with binders, such as crystalline cellulose, cellulose derivatives,
acacia, corn starch or gelatins; with disintegrators, such as corn
starch, potato starch or sodium carboxymethylcellulose; with
lubricants, such as talc or magnesium stearate; and if desired,
with diluents, buffering agents, moistening agents, preservatives
and flavoring agents.
[0285] A subject antibody can be formulated into preparations for
injection by dissolving, suspending or emulsifying them in an
aqueous or nonaqueous solvent, such as vegetable or other similar
oils, synthetic aliphatic acid glycerides, esters of higher
aliphatic acids or propylene glycol; and if desired, with
conventional additives such as solubilizers, isotonic agents,
suspending agents, emulsifying agents, stabilizers and
preservatives.
[0286] Pharmaceutical compositions comprising a subject antibody
are prepared by mixing the antibody having the desired degree of
purity with optional physiologically acceptable carriers,
excipients, stabilizers, surfactants, buffers and/or tonicity
agents. Acceptable carriers, excipients and/or stabilizers are
nontoxic to recipients at the dosages and concentrations employed,
and include buffers such as phosphate, citrate, and other organic
acids; antioxidants including ascorbic acid, glutathione, cysteine,
methionine and citric acid; preservatives (such as ethanol, benzyl
alcohol, phenol, m-cresol, p-chlor-m-cresol, methyl or propyl
parabens, benzalkonium chloride, or combinations thereof); amino
acids such as arginine, glycine, ornithine, lysine, histidine,
glutamic acid, aspartic acid, isoleucine, leucine, alanine,
phenylalanine, tyrosine, tryptophan, methionine, serine, proline
and combinations thereof; monosaccharides, disaccharides and other
carbohydrates; low molecular weight (less than about 10 residues)
polypeptides; proteins, such as gelatin or serum albumin; chelating
agents such as EDTA; sugars such as trehalose, sucrose, lactose,
glucose, mannose, maltose, galactose, fructose, sorbose, raffinose,
glucosamine, N-methylglucosamine, galactosamine, and neuraminic
acid; and/or non-ionic surfactants such as Tween, Brij Pluronics,
Triton-X, or polyethylene glycol (PEG).
[0287] The pharmaceutical composition may be in a liquid form, a
lyophilized form or a liquid form reconstituted from a lyophilized
form, wherein the lyophilized preparation is to be reconstituted
with a sterile solution prior to administration. The standard
procedure for reconstituting a lyophilized composition is to add
back a volume of pure water (typically equivalent to the volume
removed during lyophilization); however solutions comprising
antibacterial agents may be used for the production of
pharmaceutical compositions for parenteral administration; see also
Chen (1992) Drug Dev Ind Pharm 18, 1311-54.
[0288] Exemplary antibody concentrations in a subject
pharmaceutical composition may range from about 1 mg/mL to about
200 mg/ml or from about 50 mg/mL to about 200 mg/mL, or from about
150 mg/mL to about 200 mg/mL.
[0289] An aqueous formulation of the antibody may be prepared in a
pH-buffered solution, e.g., at pH ranging from about 4.0 to about
7.0, or from about 5.0 to about 6.0, or alternatively about 5.5.
Examples of buffers that are suitable for a pH within this range
include phosphate-, histidine-, citrate-, succinate-,
acetate-buffers and other organic acid buffers. The buffer
concentration can be from about 1 mM to about 100 mM, or from about
5 mM to about 50 mM, depending, e.g., on the buffer and the desired
tonicity of the formulation.
[0290] A tonicity agent may be included in the antibody formulation
to modulate the tonicity of the formulation. Exemplary tonicity
agents include sodium chloride, potassium chloride, glycerin and
any component from the group of amino acids, sugars as well as
combinations thereof. In some embodiments, the aqueous formulation
is isotonic, although hypertonic or hypotonic solutions may be
suitable. The term "isotonic" denotes a solution having the same
tonicity as some other solution with which it is compared, such as
physiological salt solution or serum. Tonicity agents may be used
in an amount of about 5 mM to about 350 mM, e.g., in an amount of
100 mM to 350 nM.
[0291] A surfactant may also be added to the antibody formulation
to reduce aggregation of the formulated antibody and/or minimize
the formation of particulates in the formulation and/or reduce
adsorption. Exemplary surfactants include polyoxyethylensorbitan
fatty acid esters (Tween), polyoxyethylene alkyl ethers (Brij),
alkylphenylpolyoxyethylene ethers (Triton-X),
polyoxyethylene-polyoxypropylene copolymer (Poloxamer, Pluronic),
and sodium dodecyl sulfate (SDS). Examples of suitable
polyoxyethylenesorbitan-fatty acid esters are polysorbate 20, (sold
under the trademark Tween 20.TM.) and polysorbate 80 (sold under
the trademark Tween 80.TM.). Examples of suitable
polyethylene-polypropylene copolymers are those sold under the
names Pluronic.RTM. F68 or Poloxamer 188.TM.. Examples of suitable
Polyoxyethylene alkyl ethers are those sold under the trademark
Brij.TM.. Exemplary concentrations of surfactant may range from
about 0.001% to about 1% w/v.
[0292] A lyoprotectant may also be added in order to protect the
labile active ingredient (e.g. a protein) against destabilizing
conditions during the lyophilization process. For example, known
lyoprotectants include sugars (including glucose and sucrose);
polyols (including mannitol, sorbitol and glycerol); and amino
acids (including alanine, glycine and glutamic acid).
Lyoprotectants can be included in an amount of about 10 mM to 500
nM.
[0293] In some embodiments, a subject formulation includes a
subject antibody, and one or more of the above-identified agents
(e.g., a surfactant, a buffer, a stabilizer, a tonicity agent) and
is essentially free of one or more preservatives, such as ethanol,
benzyl alcohol, phenol, m-cresol, p-chlor-m-cresol, methyl or
propyl parabens, benzalkonium chloride, and combinations thereof.
In other embodiments, a preservative is included in the
formulation, e.g., at concentrations ranging from about 0.001 to
about 2% (w/v).
[0294] For example, a subject formulation can be a liquid or
lyophilized formulation suitable for parenteral administration, and
can comprise: about 1 mg/mL to about 200 mg/mL of a subject
antibody; about 0.001% to about 1% of at least one surfactant;
about 1 mM to about 100 mM of a buffer; optionally about 10 mM to
about 500 mM of a stabilizer; and about 5 mM to about 305 mM of a
tonicity agent; and has a pH of about 4.0 to about 7.0.
[0295] As another example, a subject parenteral formulation is a
liquid or lyophilized formulation comprising: about 1 mg/mL to
about 200 mg/mL of a subject antibody; 0.04% Tween 20 w/v; 20 mM
L-histidine; and 250 mM Sucrose; and has a pH of 5.5.
[0296] As another example, a subject parenteral formulation
comprises a lyophilized formulation comprising: 1) 15 mg/mL of a
subject antibody; 0.04% Tween 20 w/v; 20 mM L-histidine; and 250 mM
sucrose; and has a pH of 5.5; or 2) 75 mg/mL of a subject antibody;
0.04% Tween 20 w/v; 20 mM L-histidine; and 250 mM sucrose; and has
a pH of 5.5; or 3) 75 mg/mL of a subject antibody; 0.02% Tween 20
w/v; 20 mM L-histidine; and 250 mM Sucrose; and has a pH of 5.5; or
4) 75 mg/mL of a subject antibody; 0.04% Tween 20 w/v; 20 mM
L-histidine; and 250 mM trehalose; and has a pH of 5.5; or 6) 75
mg/mL of a subject antibody; 0.02% Tween 20 w/v; 20 mM L-histidine;
and 250 mM trehalose; and has a pH of 5.5.
[0297] As another example, a subject parenteral formulation is a
liquid formulation comprising: 1) 7.5 mg/mL of a subject antibody;
0.022% Tween 20 w/v; 120 mM L-histidine; and 250 125 mM sucrose;
and has a pH of 5.5; or 2) 37.5 mg/mL of a subject antibody; 0.02%
Tween 20 w/v; 10 mM L-histidine; and 125 mM sucrose; and has a pH
of 5.5; or 3) 37.5 mg/mL of a subject antibody; 0.01% Tween 20 w/v;
10 mM L-histidine; and 125 mM sucrose; and has a pH of 5.5; or 4)
37.5 mg/mL of a subject antibody; 0.02% Tween 20 w/v; 10 mM
L-histidine; 125 mM trehalose; and has a pH of 5.5; or 5) 37.5
mg/mL of a subject antibody; 0.01% Tween 20 w/v; 10 mM L-histidine;
and 125 mM trehalose; and has a pH of 5.5; or 6) 5 mg/mL of a
subject antibody; 0.02% Tween 20 w/v; 20 mM L-histidine; and 250 mM
trehalose; and has a pH of 5.5; or 7) 75 mg/mL of a subject
antibody; 0.02% Tween 20 w/v; 20 mM L-histidine; and 250 mM
mannitol; and has a pH of 5.5; or 8) 75 mg/mL of a subject
antibody; 0.02% Tween 20 w/v; 20 mM L histidine; and 140 mM sodium
chloride; and has a pH of 5.5; or 9) 150 mg/mL of a subject
antibody; 0.02% Tween 20 w/v; 20 mM L-histidine; and 250 mM
trehalose; and has a pH of 5.5; or 10) 150 mg/mL of a subject
antibody; 0.02% Tween 20 w/v; 20 mM L-histidine; and 250 mM
mannitol; and has a pH of 5.5; or 11) 150 mg/mL of a subject
antibody; 0.02% Tween 20 w/v; 20 mM L-histidine; and 140 mM sodium
chloride; and has a pH of 5.5; or 12) 10 mg/mL of a subject
antibody; 0.01% Tween 20 w/v; 20 mM L-histidine; and 40 mM sodium
chloride; and has a pH of 5.5.
[0298] A subject antibody can be utilized in aerosol formulation to
be administered via inhalation. A subject antibody can be
formulated into pressurized acceptable propellants such as
dichlorodifluoromethane, propane, nitrogen and the like.
[0299] Furthermore, a subject antibody can be made into
suppositories by mixing with a variety of bases such as emulsifying
bases or water-soluble bases. A subject antibody can be
administered rectally via a suppository. The suppository can
include vehicles such as cocoa butter, carbowaxes and polyethylene
glycols, which melt at body temperature, yet are solidified at room
temperature.
[0300] Unit dosage forms for oral or rectal administration such as
syrups, elixirs, and suspensions may be provided wherein each
dosage unit, for example, teaspoonful, tablespoonful, tablet or
suppository, contains a predetermined amount of the composition
containing one or more inhibitors. Similarly, unit dosage forms for
injection or intravenous administration may comprise a subject
antibody in a composition as a solution in sterile water, normal
saline or another pharmaceutically acceptable carrier.
[0301] The term "unit dosage form," as used herein, refers to
physically discrete units suitable as unitary dosages for human and
animal subjects, each unit containing a predetermined quantity of
an anti-Tau antibody of the present disclosure, calculated in an
amount sufficient to produce the desired effect in association with
a pharmaceutically acceptable diluent, carrier or vehicle. The
specifications for a subject antibody may depend on the particular
antibody employed and the effect to be achieved, and the
pharmacodynamics associated with each antibody in the host.
[0302] Other modes of administration will also find use with a
method of the present disclosure. For instance, a subject antibody
can be formulated in suppositories and, in some cases, aerosol and
intranasal compositions. For suppositories, the vehicle composition
will include traditional binders and carriers such as, polyalkylene
glycols, or triglycerides. Such suppositories may be formed from
mixtures containing the active ingredient in the range of about
0.5% to about 10% (w/w), e.g., about 1% to about 2%.
[0303] Intranasal formulations will usually include vehicles that
neither cause irritation to the nasal mucosa nor significantly
disturb ciliary function. Diluents such as water, aqueous saline or
other known substances can be employed. The nasal formulations may
also contain preservatives such as, but not limited to,
chlorobutanol and benzalkonium chloride. A surfactant may be
present to enhance absorption of the subject antibody by the nasal
mucosa.
[0304] A subject antibody can be administered as an injectable
formulation. Typically, injectable compositions are prepared as
liquid solutions or suspensions; solid forms suitable for solution
in, or suspension in, liquid vehicles prior to injection may also
be prepared. The preparation may also be emulsified or the antibody
encapsulated in liposome vehicles.
[0305] Suitable excipient vehicles are, for example, water, saline,
dextrose, glycerol, ethanol, or the like, and combinations thereof.
In addition, if desired, the vehicle may contain minor amounts of
auxiliary substances such as wetting or emulsifying agents or pH
buffering agents. Actual methods of preparing such dosage forms are
known, or will be apparent, to those skilled in the art. See, e.g.,
Remington's Pharmaceutical Sciences, Mack Publishing Company,
Easton, Pa., 17th edition, 1985. The composition or formulation to
be administered will, in any event, contain a quantity of a subject
antibody adequate to achieve the desired state in the subject being
treated.
[0306] The pharmaceutically acceptable excipients, such as
vehicles, adjuvants, carriers or diluents, are readily available to
the public. Moreover, pharmaceutically acceptable auxiliary
substances, such as pH adjusting and buffering agents, tonicity
adjusting agents, stabilizers, wetting agents and the like, are
readily available to the public.
[0307] In some embodiments, a subject antibody is formulated in a
controlled release formulation. Sustained-release preparations may
be prepared using methods well known in the art. Suitable examples
of sustained-release preparations include semipermeable matrices of
solid hydrophobic polymers containing the antibody in which the
matrices are in the form of shaped articles, e.g. films or
microcapsules. Examples of sustained-release matrices include
polyesters, copolymers of L-glutamic acid and ethyl-L-glutamate,
non-degradable ethylene-vinyl acetate, hydrogels, polylactides,
degradable lactic acid-glycolic acid copolymers and
poly-D-(-)-3-hydroxybutyric acid. Possible loss of biological
activity and possible changes in immunogenicity of antibodies
comprised in sustained-release preparations may be prevented by
using appropriate additives, by controlling moisture content and by
developing specific polymer matrix compositions.
[0308] Controlled release within the scope of the present
disclosure can be taken to mean any one of a number of extended
release dosage forms. The following terms may be considered to be
substantially equivalent to controlled release, for the purposes of
the present disclosure: continuous release, controlled release,
delayed release, depot, gradual release, long-term release,
programmed release, prolonged release, proportionate release,
protracted release, repository, retard, slow release, spaced
release, sustained release, time coat, timed release, delayed
action, extended action, layered-time action, long acting,
prolonged action, repeated action, slowing acting, sustained
action, sustained-action medications, and extended release. Further
discussions of these terms may be found in Lesczek Krowczynski,
Extended-Release Dosage Forms, 1987 (CRC Press, Inc.).
[0309] The various controlled release technologies cover a very
broad spectrum of drug dosage forms. Controlled release
technologies include, but are not limited to physical systems and
chemical systems.
[0310] Physical systems include, but are not limited to, reservoir
systems with rate-controlling membranes, such as
microencapsulation, macroencapsulation, and membrane systems;
reservoir systems without rate-controlling membranes, such as
hollow fibers, ultra microporous cellulose triacetate, and porous
polymeric substrates and foams; monolithic systems, including those
systems physically dissolved in non-porous, polymeric, or
elastomeric matrices (e.g., nonerodible, erodible, environmental
agent ingression, and degradable), and materials physically
dispersed in non-porous, polymeric, or elastomeric matrices (e.g.,
nonerodible, erodible, environmental agent ingression, and
degradable); laminated structures, including reservoir layers
chemically similar or dissimilar to outer control layers; and other
physical methods, such as osmotic pumps, or adsorption onto
ion-exchange resins.
[0311] Chemical systems include, but are not limited to, chemical
erosion of polymer matrices (e.g., heterogeneous, or homogeneous
erosion), or biological erosion of a polymer matrix (e.g.,
heterogeneous, or homogeneous). Additional discussion of categories
of systems for controlled release may be found in Agis F.
Kydonieus, Controlled Release Technologies: Methods, Theory and
Applications, 1980 (CRC Press, Inc.).
[0312] There are a number of controlled release drug formulations
that are developed for oral administration. These include, but are
not limited to, osmotic pressure-controlled gastrointestinal
delivery systems; hydrodynamic pressure-controlled gastrointestinal
delivery systems; membrane permeation-controlled gastrointestinal
delivery systems, which include microporous membrane
permeation-controlled gastrointestinal delivery devices; gastric
fluid-resistant intestine targeted controlled-release
gastrointestinal delivery devices; gel diffusion-controlled
gastrointestinal delivery systems; and ion-exchange-controlled
gastrointestinal delivery systems, which include cationic and
anionic drugs. Additional information regarding controlled release
drug delivery systems may be found in Yie W. Chien, Novel Drug
Delivery Systems, 1992 (Marcel Dekker, Inc.).
Dosages
[0313] A suitable dosage can be determined by an attending
physician or other qualified medical personnel, based on various
clinical factors. As is well known in the medical arts, dosages for
any one patient depend upon many factors, including the patient's
size, body surface area, age, the particular compound to be
administered, sex of the patient, time, and route of
administration, general health, and other drugs being administered
concurrently. A subject antibody may be administered in amounts
between 1 ng/kg body weight and 20 mg/kg body weight per dose, e.g.
between 0.1 mg/kg body weight to 10 mg/kg body weight, e.g. between
0.5 mg/kg body weight to 5 mg/kg body weight; however, doses below
or above this exemplary range are envisioned, especially
considering the aforementioned factors. If the regimen is a
continuous infusion, it can also be in the range of 1 .mu.g to 10
mg per kilogram of body weight per minute.
[0314] Those of skill will readily appreciate that dose levels can
vary as a function of the specific antibody, the severity of the
symptoms and the susceptibility of the subject to side effects.
Preferred dosages for a given compound are readily determinable by
those of skill in the art by a variety of means.
Routes of Administration
[0315] A subject antibody is administered to an individual using
any available method and route suitable for drug delivery,
including in vivo and ex vivo methods, as well as systemic and
localized routes of administration.
[0316] Conventional and pharmaceutically acceptable routes of
administration include intranasal, intramuscular, intratracheal,
intrathecal, subcutaneous, intradermal, topical application,
intravenous, intraarterial, rectal, nasal, oral, and other enteral
and parenteral routes of administration. Routes of administration
may be combined, if desired, or adjusted depending upon the
antibody and/or the desired effect. A subject antibody composition
can be administered in a single dose or in multiple doses. In some
embodiments, a subject antibody composition is administered orally.
In some embodiments, a subject antibody composition is administered
via an inhalational route. In some embodiments, a subject antibody
composition is administered intranasally. In some embodiments, a
subject antibody composition is administered locally. In some
embodiments, a subject antibody composition is administered
intracranially. In some embodiments, a subject antibody composition
is administered intravenously. In some embodiments, a subject
antibody composition is administered intrathecally.
[0317] An antibody of the present disclosure can be administered to
a host using any available conventional methods and routes suitable
for delivery of conventional drugs, including systemic or localized
routes. In general, routes of administration contemplated by the
invention include, but are not necessarily limited to, enteral,
parenteral, or inhalational routes.
[0318] Parenteral routes of administration other than inhalation
administration include, but are not necessarily limited to,
topical, transdermal, subcutaneous, intramuscular, intraorbital,
intracapsular, intraspinal, intrasternal, intrathecal, and
intravenous routes, i.e., any route of administration other than
through the alimentary canal. Parenteral administration can be
carried to effect systemic or local delivery of a subject antibody.
Where systemic delivery is desired, administration typically
involves invasive or systemically absorbed topical or mucosal
administration of pharmaceutical preparations.
[0319] A subject antibody can also be delivered to the subject by
enteral administration. Enteral routes of administration include,
but are not necessarily limited to, oral and rectal (e.g., using a
suppository) delivery.
[0320] By treatment is meant at least an amelioration of the
symptoms associated with the pathological condition afflicting the
host, where amelioration is used in a broad sense to refer to at
least a reduction in the magnitude of a parameter, e.g. symptom,
associated with the pathological condition being treated, such as a
tauopathy. As such, treatment also includes situations where the
pathological condition, or at least symptoms associated therewith,
are completely inhibited, e.g. prevented from happening, or
stopped, e.g. terminated, such that the host no longer suffers from
the pathological condition, or at least the symptoms that
characterize the pathological condition.
[0321] In some embodiments, a subject antibody is administered by
injection and/or delivery, e.g., to a site in a brain artery or
directly into brain tissue. A subject antibody can also be
administered directly to a target site e.g., by biolistic delivery
to the target site.
[0322] A variety of hosts (wherein the term "host" is used
interchangeably herein with the terms "subject," "individual," and
"patient") are treatable according to the subject methods.
Generally such hosts are "mammals" or "mammalian," where these
terms are used broadly to describe organisms which are within the
class mammalia, including the orders carnivore (e.g., dogs and
cats), rodentia (e.g., mice, guinea pigs, and rats), and primates
(e.g., humans, chimpanzees, and monkeys). In some embodiments, the
hosts will be humans.
[0323] Kits with unit doses of a subject antibody, e.g. in oral or
injectable doses, are provided. In such kits, in addition to the
containers containing the unit doses will be an informational
package insert describing the use and attendant benefits of the
antibody in treating pathological condition of interest. Preferred
compounds and unit doses are those described herein above.
Detection Methods
[0324] The present disclosure provides in vitro methods of
detecting a Tau polypeptide in a biological sample obtained from an
individual; and methods of detecting a Tau polypeptide in a living
individual in vivo. A subject in vitro detection method can be
quantitative. Tau can thus serve as a biomarker for progression of
a tauopathy, or response to treatment for a tauopathy.
[0325] The Tau polypeptide that is detected/quantitated can be: a)
full-length Tau; b) an N-terminal fragment of full-length Tau; c)
total Tau, where "total Tau" can include full-length Tau of any
isoform; d) free Tau, e.g., Tau that is not bound to a subject
anti-tau antibody; and e) any N-terminal Tau fragments that are
present in a biological sample and that display the epitope
recognized by a subject anti-Tau antibody. Amino acid sequences of
human full-length Tau are presented in FIGS. 6A-D.
[0326] In some cases, a subject detection method can further
comprise determining the level of A.beta.40 and/or A.beta.42 in a
biological sample. Determination of the level of A.beta.40 and/or
A.beta.42 in a biological sample can be carried out using an
immunological assay (e.g., an ELISA), e.g., using antibody that
binds A.beta.40 and/or A.beta.42.
[0327] Suitable biological samples include, e.g., cerebrospinal
fluid, blood, plasma, serum, urine, and saliva.
[0328] An in vitro method of the present disclosure of detecting a
Tau polypeptide in a biological sample obtained from an individual
generally involves: a) contacting the biological sample with an
anti-Tau antibody as described herein; and b) detecting binding of
the antibody to Tau polypeptide present in the sample. In some
cases, the anti-Tau antibody comprises VH and/or VL CDRs of
depicted in FIGS. 1A and 1B. In some cases, the anti-Tau antibody
comprises VH and/or VL CDRs of FIGS. 2A and 2B.
[0329] A detection method of the present disclosure can be used to
determine whether an individual has, or is at risk of developing, a
tauopathy. A detection method of the present disclosure can be used
to determine the stage (severity) of a tauopathy. A detection
method of the present disclosure can be used to determine a
patient's response to a treatment regimen for treating a tauopathy.
A biological sample can be tested using a subject detection method,
where the biological sample is obtained from an individual
suspected of having a tauopathy, an individual who has been
diagnosed as having a tauopathy, an individual who has a genetic
predisposition to developing a tauopathy, etc.
[0330] The present disclosure provides a method of diagnosing a
neurodegenerative tauopathy in an individual. The method generally
involves (a) assessing the level of a Tau polypeptide in a
biological sample obtained from the individual; and (b) comparing
the level of the Tau polypeptide to a reference, a standard, or a
normal control value that indicates the level of Tau in normal
control subjects. A significant difference between the level of Tau
polypeptide in the biological sample and the normal control value
indicates that the individual has a neurodegenerative
tauopathy.
[0331] The present disclosure provides a method of monitoring the
progression of, or monitoring response to treatment for, a
neurodegenerative tauopathy in an individual. The method generally
involves comparing the level of a Tau polypeptide in a biological
sample obtained from the individual at a first time point with the
level of a Tau polypeptide in a biological sample obtained from the
individual at a second time point. A difference in the level of the
Tau polypeptide in a biological sample obtained from the individual
at a second time point, compared to the level of the Tau
polypeptide in a biological sample obtained from the individual at
a first time point, can provide an indication as to: i) whether the
tauopathy is progressing or whether progression of the disease has
halted; and/or ii) how quickly the tauopathy is progressing; and/or
iii) whether the individual is exhibiting a beneficial clinical
response to treatment with a drug or other treatment regimen for
treating the tauopathy.
[0332] The present disclosure provides a method of staging a
tauopathy. For example, a subject method can provide for staging
Alzheimer's disease. For example, the level of a Tau polypeptide in
a biological sample (e.g., the CSF or other liquid biological
sample) from a living individual can provide an indication as to
the Braak stage of AD. Braak and Braak (1995) Neurobiol. Aging
16:271. For example, the level of a Tau polypeptide in a biological
sample from a living individual can provide an indication as to
whether the individual is in transentorhinal stages I-II of AD;
limbic stages III-IV of AD; or neocortical stages V-VI of AD.
[0333] The level of a Tau polypeptide in a biological sample can be
assessed by any suitable method known in the art. Suitable methods
include, but are not limited to, a protein ("Western") blot,
immunoprecipitation, enzyme-linked immunosorbent assay (ELISA),
radioimmunoassay (RIA), fluorescent activated cell sorting (FACS),
two-dimensional gel electrophoresis, mass spectroscopy (MS),
matrix-assisted laser desorption/ionization-time of flight-MS
(MALDI-TOF), surface-enhanced laser desorption ionization-time of
flight (SELDI-TOF), high performance liquid chromatography (HPLC),
fast protein liquid chromatography (FPLC), multidimensional liquid
chromatography (LC) followed by tandem mass spectrometry (MS/MS),
and laser densitometry.
[0334] The present disclosure provides a method of monitoring
progression of a tauopathy in an individual, where the method
generally involves: a) determining a first level of a Tau
polypeptide in a biological sample obtained from the individual at
a first time point; b) determining a second level of a Tau
polypeptide in a biological sample obtained from the individual at
a second time point; and c) comparing the second level of Tau with
the first level of Tau. The determining steps can comprise: i)
contacting the biological sample with a subject anti-Tau antibody;
and ii) quantitating binding of the antibody to Tau polypeptide
present in the sample.
[0335] In some cases, the first time point is a time point before
initiation of a treatment regimen, and the second time point is a
time point after initiation of a treatment regimen. Thus, the
instant disclosure provides a method of monitoring response to
treatment with an agent that treats a tauopathy, where the method
involves: a) determining a first level of a Tau polypeptide in a
biological sample obtained from the individual at a first time
point that is before treatment with an agent to treat a tauopathy
is initiated; b) determining a second level of a Tau polypeptide in
a biological sample obtained from the individual at a second time
point that is after initiation of treatment with an agent to treat
a tauopathy; and c) comparing the second level of Tau with the
first level of Tau.
[0336] A subject method of monitoring progression of a tauopathy
can also be applied to methods of monitoring progression of a
synucleinopathy, e.g., Parkinson's disease (PD); dementia with Lewy
Bodies (DLB); multiple system atrophy (MSA); etc. For example,
progression of PD with dementia (PDD) can be monitored with a
subject method.
[0337] In some tauopathies, the level of Tau increases with
progression of the disease. In other tauopathies, the level of Tau
decreases with progression of the disease. Thus, e.g., the level of
Tau increases with progression of AD; and decreases with
progression of FTD.
[0338] A subject method can involve use of a kit or an assay device
comprising a subject anti-Tau antibody. The present disclosure
provides kits and assay devices for carrying out a method as
described herein. A subject kit includes an anti-tau antibody of
the present disclosure.
[0339] The anti-tau antibody can be immobilized on an insoluble
support (e.g., a test strip, a well of a multi-well plate, a bead
(e.g., a magnetic bead), etc.). Suitable supports are well known in
the art and comprise, inter alia, commercially available column
materials, polystyrene beads, latex beads, magnetic beads, colloid
metal particles, glass and/or silicon chips and surfaces,
nitrocellulose strips, nylon membranes, sheets, wells of reaction
trays (e.g., multi-well plates), plastic tubes, etc. A solid
support can comprise any of a variety of substances, including,
e.g., glass, polystyrene, polyvinyl chloride, polypropylene,
polyethylene, polycarbonate, dextran, nylon, amylose, natural and
modified celluloses, polyacrylamides, agaroses, and magnetite.
Suitable methods for immobilizing a subject antibody onto a solid
support are well known and include, but are not limited to ionic,
hydrophobic, covalent interactions and the like. Solid supports can
be soluble or insoluble, e.g., in aqueous solution. In some
embodiments, a suitable solid support is generally insoluble in an
aqueous solution.
[0340] An anti-tau antibody of the present disclosure can comprise
a detectable label. Where the antibody comprises a detectable
label, a subject kit can include one or more reagents for
developing the detectable label. A labeled antibody can comprise a
label such as a chemiluminescent agent, a particulate label, a
colorimetric agent, an energy transfer agent, an enzyme, a
fluorescent agent, or a radioisotope. Suitable detectable labels
include any composition detectable by spectroscopic, photochemical,
biochemical, immunochemical, electrical, optical, or chemical
means. Suitable detectable labels include, but are not limited to,
fluorescent labels (e.g., fluorescein isothiocyanate, texas red,
rhodamine, a green fluorescent protein, a red fluorescent protein,
a yellow fluorescent protein, and the like); radiolabels (e.g.,
.sup.3H, .sup.125I, .sup.35S, .sup.14C, or .sup.32P); and enzymes
(e.g., horse radish peroxidase, alkaline phosphatase, luciferase,
and other enzymes that act on a substrate to produce a product that
can be detected by fluorometric, colorimetric, or
spectrophotometric means).
[0341] A subject kit can further include one or more additional
components, where suitable additional components include: 1) a
positive control; 2) a buffer (e.g., a binding buffer; a wash
buffer; etc.); 3) reagents for use in generating a detectable
signal; and the like. Other optional components of the kit include:
a protease inhibitor; a detectable label; etc. The various
components of the kit may be present in separate containers or
certain compatible components may be pre-combined into a single
container, as desired.
[0342] In addition to above-mentioned components, a subject kit can
include instructions for using the components of the kit to
practice a subject method. The instructions for practicing a
subject method are generally recorded on a suitable recording
medium. For example, the instructions may be printed on a
substrate, such as paper or plastic, etc. As such, the instructions
may be present in the kits as a package insert, in the labeling of
the container of the kit or components thereof (i.e., associated
with the packaging or subpackaging) etc. In other embodiments, the
instructions are present as an electronic storage data file present
on a suitable computer readable storage medium, e.g. compact
disc-read only memory (CD-ROM), digital versatile disk (DVD),
diskette, etc. In yet other embodiments, the actual instructions
are not present in the kit, but means for obtaining the
instructions from a remote source, e.g. via the internet, are
provided. An example of this embodiment is a kit that includes a
web address where the instructions can be viewed and/or from which
the instructions can be downloaded. As with the instructions, this
means for obtaining the instructions is recorded on a suitable
substrate.
[0343] An assay device can include a subject anti-Tau antibody
immobilized on a solid substrate. The assay device can be in any of
a variety of formats, e.g., a test strip, a dipstick; etc.
In Vivo Imaging
[0344] As discussed above, the present disclosure provides methods
of detecting a Tau polypeptide in a living individual, e.g., by an
in vivo imaging technique. For example, in one embodiment, in vivo
imaging of a Tau polypeptide can be accomplished by positron
emission tomography (PET), single photon emission tomography
(SPECT), near infrared (NIR) optical imaging, or magnetic resonance
imaging (MRI). A subject anti-tau antibody is administered to an
individual, and the presence and/or level of the tau polypeptide is
detected. The anti-tau antibody can comprise a label suitable for
use in PET, SPECT, NIR, or MRI. Such labels include a contrast
agent or a radioisotope, where the contrast agent or radioisotope
is one that is suitable for use in imaging, e.g., imaging
procedures carried out on humans, as described above. In some
cases, the anti-Tau antibody comprises VH and/or VL CDRs of IPN001.
In some cases, the anti-Tau antibody comprises VH and/or VL CDRs of
IPN002. The anti-Tau antibody can comprise one or more humanized
framework regions, as described above.
Generating a Report
[0345] In some instances, a subject detection method comprises
detecting a Tau polypeptide in a biological sample obtained from an
individual; and, based on the level of detected Tau polypeptide,
generating a report and/or directing therapy or management of the
individual from whom the biological sample was obtained.
[0346] A report can include one or more of: an indication as to
whether the individual likely has a tauopathy; an indication of the
severity of the tauopathy; an indication as to whether the
individual exhibits a beneficial clinical response to treatment for
the tauopathy; and the like.
[0347] Thus, a report can include information such as a predicted
likelihood that the individual has, or will develop, a tauopathy; a
recommendation regarding further evaluation; a recommendation
regarding therapeutic drug and/or other health management
intervention; and the like.
[0348] For example, the methods disclosed herein can further
include a step of generating or outputting a report providing the
results of a subject assessment, which report can be provided in
the form of an electronic medium (e.g., an electronic display on a
computer monitor), or in the form of a tangible medium (e.g., a
report printed on paper or other tangible medium). An assessment as
to the likelihood that a person has, or at risk of developing, a
tauopathy can be referred to as a "risk report," "a risk score," or
"a likelihood score." A person or entity that prepares a report
("report generator") may also perform steps such as sample
gathering, sample processing, and the like. Alternatively, an
entity other than the report generator can perform steps such as
sample gathering, sample processing, and the like. A risk
assessment report can be provided to a user. A "user" can be a
health professional (e.g., a clinician, a laboratory technician, or
a physician).
Directing Health Management
[0349] In some instances, a subject detection method comprises
detecting a Tau polypeptide in a biological sample obtained from an
individual; and, based on the level of detected Tau polypeptide,
generating a report and/or directing therapy or management of the
individual from whom the biological sample was obtained.
[0350] Thus, e.g., depending on the outcome of a subject detection
method, a recommendation can be made that the individual undergo
therapeutic intervention (treatment) for the tauopathy and/or that
the individual be considered for special health management.
[0351] Therapeutic intervention can include, e.g., drug therapy for
the treatment of Alzheimer's disease. Examples of drug therapy for
the treatment of Alzheimer's disease include, but are not limited
to, acetylcholinesterase inhibitors, including, but not limited to,
Aricept (donepezil), Exelon (rivastigmine), metrifonate, and
tacrine (Cognex); an anti-A.beta. antibody (e.g., solanezumab); an
anti-tau antibody; non-steroidal anti-inflammatory agents,
including, but not limited to, ibuprofen and indomethacin;
cyclooxygenase-2 (Cox2) inhibitors such as Celebrex; and monoamine
oxidase inhibitors, such as Selegilene (Eldepryl or Deprenyl).
Dosages for each of the above agents are known in the art. For
example, Aricept can be administered at 50 mg orally per day for 6
weeks, and, if well tolerated by the individual, at 10 mg per day
thereafter.
Determining the Amount of Free and Bound Extracellular Tau
[0352] Following administration of an anti-eTau antibody to an
individual, it may be of interest to determine the amount of eTau
remaining in the CSF or ISF that is not bound to the anti-eTau
antibody. The present disclosure provides methods for determining
the amount of such free eTau. A schematic representation of a
method for determining the amount of eTau remaining in the CSF or
ISF that is not bound to the anti-eTau antibody is depicted in FIG.
54A. Following administration of an anti-eTau antibody to an
individual, it may also be of interest to determine the amount of
eTau in CSF or ISF that is bound to an anti-eTau antibody. A
schematic representation of a method for determining the amount of
eTau in CSF or ISF that is bound to an anti-eTau antibody is
depicted in FIG. 54B.
Determining the Amount of Free Extracellular Tau
[0353] The present disclosure provides a method of determining the
amount of extracellular Tau (eTau) unbound to an anti-eTau antibody
in a sample of CSF or ISF obtained from a subject undergoing
therapy with the anti-eTau antibody. The method generally involves:
a) contacting an immobilized antibody with a sample of CSF or ISF
obtained from the subject, where the immobilized antibody competes
for binding to eTau with the anti-eTau antibody administered to the
subject, and where the contacting is under conditions suitable for
binding of the unbound eTau to the immobilized antibody; and b)
determining the amount of eTau bound to the immobilized antibody.
The amount of eTau bound to the immobilized antibody is an
indication of the amount of eTau unbound to the anti-Tau antibody
in the sample. In some cases, the amount of eTau bound to the
immobilized antibody is determined using a detectably labeled third
antibody that does not compete with the immobilized antibody for
binding to the eTau.
[0354] As noted above, the assay measures the amount of eTau in a
CSF or ISF sample obtained from an individual undergoing therapy
with an anti-eTau antibody. In some cases, the anti-eTau antibody
is a therapeutic humanized anti-eTau antibody. In some cases, the
anti-eTau antibody is a humanized anti-eTau antibody of the present
disclosure. In some cases, the anti-eTau antibody is hu-IPN002.
[0355] In some cases, a subject method will comprise: a)
determining the amount of eTau unbound to an anti-eTau antibody in
a sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; and b) determining
the level of total tau in the sample.
[0356] In some cases, a subject method will comprise: a)
determining the amount of eTau unbound to an anti-eTau antibody in
a sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; and b) comparing
the level of unbound Tau in the sample to the level of total tau in
a CSF or ISF sample obtained from the individual before treatment
with the anti-eTau antibody.
[0357] A subject detection method is suitable for determining the
level of extracellular tau. "Extracellular tau" ("eTau"), as used
herein, encompasses any Tau polypeptide that can be detected in
cerebrospinal fluid (CSF) or interstitial fluid (ISF). In some
embodiments, eTau is a polypeptide having a length of 175 amino
acids and comprising amino acids 2-176 of full-length tau; for
example, in some embodiments eTau is a polypeptide comprising the
amino acid sequence set forth in SEQ ID NO:45. In some embodiments,
eTau is a polypeptide having a length of 171 amino acids and
comprising amino acids 2-172 of full-length tau; for example, in
some embodiments eTau is a polypeptide comprising the amino acid
sequence set forth in SEQ ID NO:44. In some embodiments, eTau is an
eTau-2 polypeptide comprising the amino acid sequence set forth in
SEQ ID NO:46. In some embodiments, eTau is an eTau-3 polypeptide
comprising the amino acid sequence set forth in SEQ ID NO:47. In
some embodiments, eTau is an eTau-4 polypeptide comprising the
amino acid sequence set forth in SEQ ID NO:48.
[0358] In some cases, an eTau polypeptide has a length of from
about 50 amino acids to about 175 amino acids, e.g., from about 50
amino acids (aa) to about 75 aa, from about 75 aa to about 100 aa,
from about 100 aa to about 125 aa, from about 125 aa to about 150
aa, or from about 150 aa to about 175 aa; and can comprise from 50
to about 75, from about 75 to about 100, from about 100 to about
125, from about 125 to about 150, or from about 150 to about 175,
contiguous amino acids of amino acids 2-176 of full-length tau.
Exemplary eTau polypeptides are depicted in FIG. 20.
Determining the Amount of Extracellular Tau Bound to an Anti-eTau
Antibody
[0359] The present disclosure provides a method of determining the
amount of eTau bound to a therapeutic anti-eTau antibody in a
sample of CSF or ISF obtained from a subject undergoing therapy
with the therapeutic anti-eTau antibody. The method generally
involves: a) contacting an immobilized antibody with a sample of
CSF or ISF obtained from the subject, where the immobilized
antibody does not compete for binding to eTau with the anti-eTau
antibody administered to the subject, said contacting being under
conditions suitable for binding of the therapeutic antibody-bound
eTau to the immobilized antibody; and b) determining the amount of
therapeutic anti-eTau/eTau complex bound to the immobilized
antibody, wherein the amount of therapeutic anti-eTau antibody/eTau
complex bound to the immobilized antibody is an indication of the
amount of therapeutic antibody-bound eTau present in the sample.
The amount of therapeutic anti-eTau antibody/eTau complex bound to
the immobilized antibody is determined by detecting the anti-eTau
antibody present in the anti-eTau antibody/eTau complex. The amount
of therapeutic anti-eTau antibody/eTau complex bound to the
immobilized antibody is determined by detecting the anti-eTau
antibody present in the anti-eTau antibody/eTau complex provides an
indication of the amount of Tau bound to the therapeutic antibody
in the CSF or ISF sample.
[0360] As noted above, the assay measures the amount of therapeutic
antibody-bound eTau in a CSF or ISF sample obtained from an
individual undergoing therapy with the anti-eTau antibody. In some
cases, the anti-eTau antibody is a therapeutic humanized anti-eTau
antibody. In some cases, the anti-eTau antibody is a humanized
anti-eTau antibody of the present disclosure. In some cases, the
anti-eTau antibody is hu-IPN002.
[0361] In some cases, a subject method will comprise: a)
determining the amount of eTau bound to an anti-eTau antibody in a
sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; and b) determining
the level of total tau in the sample. In some cases, a subject
method will comprise: a) determining the amount of eTau bound to an
anti-eTau antibody in a sample of CSF or ISF obtained from a
subject undergoing therapy with the anti-eTau antibody, as
described above; and b) determining the amount of eTau in the CSF
or ISF sample that is not bound to the therapeutic anti-eTau
antibody. In some cases, a subject method will comprise: a)
determining the amount of eTau bound to an anti-eTau antibody in a
sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; b) determining the
level of total tau in the sample; and c) determining the amount of
eTau in the CSF or ISF sample that is not bound to the therapeutic
anti-eTau antibody.
[0362] In some cases, a subject method will comprise: a)
determining the amount of eTau bound to an anti-eTau antibody in a
sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; and b) comparing
the level of anti-e-Tau antibody-bound Tau in the sample to the
level of total tau in a CSF or ISF sample obtained from the
individual before treatment with the anti-eTau antibody.
[0363] In some cases, a subject method will comprise: a)
determining the amount of eTau unbound to an anti-eTau antibody in
a sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; b) determining the
amount of eTau bound to an anti-eTau antibody in a sample of CSF or
ISF obtained from a subject undergoing therapy with the anti-eTau
antibody, as described above; and c) comparing the level of unbound
Tau and the level of anti-eTau antibody-bound Tau in the sample to
the level of total tau in a CSF or ISF sample obtained from the
individual before treatment with the anti-eTau antibody.
[0364] A subject detection method is suitable for determining the
level of extracellular tau bound to a therapeutic antibody.
"Extracellular tau" ("eTau"), as used herein, encompasses any Tau
polypeptide that can be detected in cerebrospinal fluid (CSF) or
interstitial fluid (ISF). In some embodiments, eTau is a
polypeptide having a length of 175 amino acids and comprising amino
acids 2-176 of full-length tau; for example, in some embodiments
eTau is a polypeptide comprising the amino acid sequence set forth
in SEQ ID NO:45. In some embodiments, eTau is a polypeptide having
a length of 171 amino acids and comprising amino acids 2-172 of
full-length tau; for example, in some embodiments eTau is a
polypeptide comprising the amino acid sequence set forth in SEQ ID
NO:44. In some embodiments, eTau is an eTau-2 polypeptide
comprising the amino acid sequence set forth in SEQ ID NO:46. In
some embodiments, eTau is an eTau-3 polypeptide comprising the
amino acid sequence set forth in SEQ ID NO:47. In some embodiments,
eTau is an eTau-4 polypeptide comprising the amino acid sequence
set forth in SEQ ID NO:48.
[0365] In some cases, an eTau polypeptide has a length of from
about 50 amino acids to about 175 amino acids, e.g., from about 50
amino acids (aa) to about 75 aa, from about 75 aa to about 100 aa,
from about 100 aa to about 125 aa, from about 125 aa to about 150
aa, or from about 150 aa to about 175 aa; and can comprise from 50
to about 75, from about 75 to about 100, from about 100 to about
125, from about 125 to about 150, or from about 150 to about 175,
contiguous amino acids of amino acids 2-176 of full-length tau.
Exemplary eTau polypeptides are depicted in FIG. 20.
Generating a Report
[0366] In some cases, a subject method will comprise: a)
determining the amount of eTau unbound to an anti-eTau antibody in
a sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; and b) generating
a report and/or directing therapy or management of the individual
from whom the sample was obtained. In some cases, a subject method
will comprise: a) determining the amount of eTau unbound to an
anti-eTau antibody in a sample of CSF or ISF obtained from a
subject undergoing therapy with the anti-eTau antibody, as
described above; b) comparing the level of unbound Tau in the
sample to the level of total tau in a CSF or ISF sample obtained
from the individual before treatment with the anti-eTau antibody;
and c) generating a report and/or directing therapy or management
of the individual from whom the sample was obtained.
[0367] In some cases, a subject method will comprise: a)
determining the amount of eTau bound to an anti-eTau antibody in a
sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; and b) generating
a report with the results of the determination. The report can
further include one or both of the amount of unbound Tau in the
sample to the level of total tau in a CSF or ISF sample after
treatment with the anti-Tau antibody; and the amount of total Tau
in a CSF or ISF sample obtained from the individual before
treatment with the anti-eTau antibody.
[0368] A report can include, e.g., an indication as to whether the
individual exhibits a beneficial clinical response to treatment for
the tauopathy; an indication as to whether the dosage of the
anti-eTau antibody should be maintained, increased, or decreased;
and the like.
[0369] Thus, a report can include information such as a
recommendation regarding further evaluation; a recommendation
regarding therapeutic drug and/or other health management
intervention; a recommendation to increase the dosage of anti-eTau
antibody; a recommendation to maintain the dosage of anti-eTau
antibody; a recommendation to reduce the dosage of anti-eTau
antibody; and the like.
[0370] For example, the methods disclosed herein can further
include a step of generating or outputting a report providing the
results of a subject assessment, which report can be provided in
the form of an electronic medium (e.g., an electronic display on a
computer monitor), or in the form of a tangible medium (e.g., a
report printed on paper or other tangible medium). A person or
entity that prepares a report ("report generator") may also perform
steps such as sample gathering, sample processing, and the like.
Alternatively, an entity other than the report generator can
perform steps such as sample gathering, sample processing, and the
like. A risk assessment report can be provided to a user. A "user"
can be a health professional (e.g., a clinician, a laboratory
technician, or a physician).
Directing Health Management
[0371] In some instances, a subject method comprises a) determining
the amount of eTau unbound to an anti-eTau antibody in a sample of
CSF or ISF obtained from a subject undergoing therapy with the
anti-eTau antibody, as described above; and, based on the
determined amount of eTau unbound to an anti-eTau antibody,
generating a report and/or directing therapy or management of the
individual from whom the biological sample was obtained.
[0372] In some cases, a subject method comprises a) determining the
amount of eTau unbound to an anti-eTau antibody in a sample of CSF
or ISF obtained from a subject undergoing therapy with the
anti-eTau antibody, as described above; and, based on the
determined amount of eTau unbound to an anti-eTau antibody,
maintaining the dosage of anti-eTau antibody that was administered
to the subject. In some cases, a subject method comprises a)
determining the amount of eTau unbound to an anti-eTau antibody in
a sample of CSF or ISF obtained from a subject undergoing therapy
with the anti-eTau antibody, as described above; and, based on the
determined amount of eTau unbound to an anti-eTau antibody,
increasing the dosage of anti-eTau antibody administered to the
subject. In some cases, a subject method comprises a) determining
the amount of eTau unbound to an anti-eTau antibody in a sample of
CSF or ISF obtained from a subject undergoing therapy with the
anti-eTau antibody, as described above; and, based on the
determined amount of eTau unbound to an anti-eTau antibody,
decreasing the dosage of anti-eTau antibody administered to the
subject.
EXAMPLES
[0373] The following examples are put forth so as to provide those
of ordinary skill in the art with a complete disclosure and
description of how to make and use the present invention, and are
not intended to limit the scope of what the inventors regard as
their invention nor are they intended to represent that the
experiments below are all or the only experiments performed.
Efforts have been made to ensure accuracy with respect to numbers
used (e.g. amounts, temperature, etc.) but some experimental errors
and deviations should be accounted for. Unless indicated otherwise,
parts are parts by weight, molecular weight is weight average
molecular weight, temperature is in degrees Celsius, and pressure
is at or near atmospheric. Standard abbreviations may be used,
e.g., bp, base pair(s); kb, kilobase(s); pl, picoliter(s); s or
sec, second(s); min, minute(s); h or hr, hour(s); aa, amino
acid(s); kb, kilobase(s); bp, base pair(s); nt, nucleotide(s);
i.m., intramuscular(ly); i.p., intraperitoneal(ly); s.c.,
subcutaneous(ly); and the like.
Example 1
Cloning and Sequencing of IPN001 and IPN002 VH and VL Regions
[0374] Amino acid sequences of the VH and VL regions of IPN001
(also referred to herein as "IPN1" or "IPN-1") and IPN002 (also
referred to herein as "IPN2" or "IPN-2") antibodies were
determined. The amino acid sequences of the VH and VL regions of
IPN001 are depicted in FIGS. 1A and 1B, respectively. The amino
acid sequences of the VH and VL regions of IPN002 are depicted in
FIGS. 2A and 2B, respectively. The CDRs are in bold text and are
underlined. CDRs were determined using the method of Kabat et al.
(see Table 1; and J. Biol. Chem. 252:6609-6616 (1977); and Kabat et
al., U.S. Dept. of Health and Human Services, "Sequences of
proteins of immunological interest" (1991)).
Example 2
Electrophysiological Analysis of the Effect of Anti-Tau
Antibodies
Materials and Methods
[0375] Whole cell patch clamp recording from induced pluripotent
stem cells (iPSC) derived cortical neurons cultured on a monolayer
of normal human astrocytes was carried out using a patch pipette
(2-5 MOhm) filled with solution containing (mM): K-methyl-sulfate
(140), NaCl (10), CaCl.sub.2 (1), Mg-ATP (3); Na-GTP (0.4), EGTA
(0.2), HEPES (10), Phosphocreatine with adjusted pH=7.3 and
mOsm=300. Neurons were perfused (2 ml/min) with artificial cerebral
spinal fluid containing (mM): NaCl (140), KCl (2.5), MgCl.sub.2 (2)
CaCl.sub.2 (2), Hepes (10), D-Glucose (10), sucrose (20). Adjusted
pH=7.4 mOsm=310. Recordings were done using pClamp-10.3 data
acquisition software (Molecular Devices) and MultiClamp 700B
amplifier (Axon Instrument; Foster City Calif.). AD tau and AD Tau
pre-incubated with IPN001 or IPN002 (2-hrs at room temperature or
24-hrs at 4 degree C. at 10:1 weight ratio) were applied via
MinisQuirt micro-perfusion system (AutoMate, Berkeley, Calif.).
Data analysis was done off-line using Clampfit 10.2 analysis
software (Molecular Devices). All recordings were done at room
temperature.
Results
[0376] The data are depicted in FIGS. 3A-D.
[0377] Application of AD-Tau (6 .mu.g/ml) causes cortical neuron
membrane depolarization (A, B, and C). Pre-incubation of AD-Tau (6
.mu.g/ml) with IPN001 (60 .mu.g/ml) (A) or IPN002 (60 .mu.g/ml) (B)
for >2 hrs reduces AD-Tau mediated membrane depolarization. C.
Pre-incubation of AD-Tau (6 .mu.g/ml) with mouse IgG (60 .mu.g/ml)
did not reduce AD-Tau mediated membrane depolarization in cortical
neurons. D. Data summary showing IPN001 and IPN002 significantly
reduced AD-Tau mediated membrane depolarization (Paired t-test *
p<0.037; ** p<0.009, p<0.003).
Example 3
Immunoreactivity of IPN001 and IPN002 with Tau in CSF from AD
Patients
[0378] Cerebrospinal fluid (CSF) was pooled from 10 healthy donors
(1 ml each). CSF was also pooled from 10 Alzheimer's disease (AD)
patients (1 ml each). Aliquots of CSF pools were saved for ELISA
analysis. 10 mls of conditioned media from cortical neurons
differentiated for 315 days from a Down's induced pluripotent stem
cell (iPSC) iPSC line (8941.1) was used as a control for the CSF
affinity isolations and an aliquot was also saved for ELISA
analysis. To determine if CSF contains IPN002-reactive Tau, each of
the CSF pooled samples and conditioned media were precleared on an
IgG1 coupled resin and the flow-through subsequently applied to an
IPN001-coupled resin. The IPN001 resins were washed thoroughly with
phosphate buffered saline (PBS) and bound proteins eluted with 50
mM Glycine, 150 mM NaCl, pH 2.3 and neutralized with 1M Tris, pH
8.3 after elution. The eluted proteins were concentrated on YM10
concentrators and added to sample buffer for sodium dodecyl
sulfate-polyacrylamide gel electrophoresis (SDS-PAGE)
electrophoresis and Western blotting analysis.
[0379] To determine if IPN002 reacts with any form of Tau in the
CSF, Western blots of the IPN002 eluted protein were probed with
IPN001, Santa Cruz Tau H-150 (aa1-150) and with Dako's Tau #A0024
antibody which reacts with the C-termini (aa#243-441) of Tau. The
data are depicted in FIGS. 4A-C.
[0380] Western blots showed IPN001 (FIG. 4a) and Tau H-150 (FIG.
4b) immunoreactive bands present in the IPN002 affinity purified
protein from both healthy and AD CSF that ranged in molecular
weight from .about.25 kd to 37 kd. These Tau fragments were similar
in their sizes, but not in their relative abundance, to eTau
fragments isolated from the Down's line conditioned media. The Dako
C-terminal tau antibody (FIG. 4c) did not detect any reactive
species from the IPN002 affinity isolation from either CSF or from
conditioned media. Full-length Tau was not detected by any of the
Tau antibodies from the IPN002 affinity isolation. Because the
IPN002 affinity isolated proteins were reactive with IPN001 and
IPN002 on Western blot, it was concluded that Tau in CSF is also
IPN001 reactive.
[0381] The CSF and conditioned media flow-through from the IPN002
affinity resins were then applied sequentially to and eluted from
T46 (Tau #428-441) and HT7 (Tau #159-163) to determine if any
C-terminal or mid-region tau fragments were present that were not
isolated by IPN002. The eluates were probed with the Dako
C-terminal antibody (FIG. 4c) but no immunoreactivity was detected.
These data suggest that IPN001 and IPN002 immunoreactive tau is
more abundant than full length, mid-region only or C-terminal tau
fragments.
[0382] Aliquots of the flow-through from each of the CSFs and
conditioned media were saved for pre-versus post-isolation
comparison to determine if all detectable tau was removed during
the isolation, using a commercially available kit commonly used to
determine Tau levels in CSF. The data are shown in FIG. 5. This
analysis demonstrated that all the detectable tau was removed from
the post-CSF samples during the affinity isolation process.
[0383] These data provide strong evidence that both IPN001 and
IPN002 react with the major tau species present in CSF from both
healthy and AD patients.
Example 4
Detection of eTau in Patient Samples
Materials and Methods
[0384] Conditioned Media Collection from iPS C-Derived Cortical
Neurons
[0385] iPSC (induced pluripotent stem cells) were generated from
healthy age matched controls and Alzheimer's patients using the
Yamanaka method (Takahashi et al. (2007) Cell 131(5), 861) as
described in Dimos et al. (2008) Science 321:1218. iPSC were
differentiated to cortical neurons largely in line with published
protocols using the dual SMAD monolayer method (Chambers et al.
(2009) Nat. Biotechnol. 27:275) followed by cortical neuron
differentiation similar to that described in Shi et al. (2012) Nat.
Neurosci. 15:477). iPSC-derived cortical neurons (iPSC-CN),
cultured for 108 days, were washed, fresh media added, and
conditioned media collected after three days unless otherwise
noted. Multiple differentiations from the lines were conducted to
ensure reproducibility of the eTau levels. Conditioned media was
spun at 15,000 rpm for 15 minutes prior to processing for Western
blot or tau ELISA. For the brefeldin A experiment, iPSC-CN cultures
were washed with PBS prior to addition of fresh media with and
without 1 .mu.M brefeldin A and media conditioned for one hour
prior to collection.
Conditioned Media Collection from Human Primary Cortical
Neurons
[0386] Human cortical neuron cultures (HCC) were prepared as
described in Wright et al. (2007) Neurobiol. Aging 28:226. Briefly,
human fetal cerebral cortical tissue was obtained by Advanced
Bioscience Resources (Alameda, Calif.) and complied with federal
guidelines for fetal research and with the Uniformed Anatomical
Gift Act. The tissue was rinsed in Hank's buffered saline solution
(Cellgro) and triturated in the presence of 1 .mu.g/ml DNase (EMD)
and passed through a 100 .mu.m cell strainer. After centrifugation
the pellet was resuspended in 0.05% trypsin/EDTA (Invitrogen) for
20 min at 37.degree. C. Trypsin was inactivated by adding an equal
volume of media containing 10% fetal bovine serum (FBS) and sample
gently triturated again in presence of DNase. After centrifugation,
cells were resuspended in plating media (Neurobasal containing B27,
Invitrogen) and counted. Cells were plated in plates or on
coverslips coated with poly-d-lysine with laminin. Three week old
HCC were washed, fresh media added and media collected after three
days of conditioning. Conditioned media was spun at 15,000 rpm for
15 minutes prior to processing for Western blot.
P301L Mouse ISF and Human CSF Collections
[0387] Mice were anesthetized using isoflurane (2%, 800 mL/min
O.sub.2). Bupivacain/epinephrine was used for local analgesia and
fynadine or carprophen for peri-/post-operative analgesia. The
animals were placed in a stereotaxic frame (Kopf instruments, USA).
Push-pull microdialysis probes (phosphatidyl ethanolamine (PEE)
membrane, Brainlink, the Netherlands) were inserted into the
hippocampus (3 mm exposed surface). Microdialysis sampling was
performed 24 and 48 hours after surgery. On the days of the
sampling, the probes of the animals were connected with fluorinated
ethylene propylene (FEP) tubing to a microperfusion pump (Harvard
PHD 2000 Syringe pump, Holliston, Mass. or similar). Microdialysis
probes were perfused with artificial CSF (aCSF) containing 147 mM
NaCl, 3.0 mM KCl, 1.2 mM CaCl.sub.2 and 1.2 mM MgCl.sub.2, and
0.15% bovine serum albumin (BSA) at a flow rate of 0.75 .mu.L/min.
Microdialysis samples were collected for 60 minute periods. After
the stabilization period, basal samples were collected. On the
second day of sampling, the above procedure was repeated (Brains
Online). The interstitial fluid (ISF) was spun at 15,000 rpm for 15
minutes and cleared supernatants used for eTau Western blots.
[0388] 10 mls of CSF (Precision Med) from a pool of 10 healthy
(Precision Med), 10 AD patients (Precision Med) and 10 PSP patients
were collected, spun at 15,000 rpm for 15 minutes, supernatants
precleared on IgG affinity resin followed by tau isolation on an
IPN002 anti-tau affinity resin, washed, eluted with 50 mM glycine,
pH 2.3 with 150 mM NaCl into a tube containing 1M TBS, pH 8.3 to
neutralize the pH, concentrated on YM10 filters and prepared for
tau Western blots. iPSC-CN conditioned media from a fAD PSEN1
patient was similarly isolated as a positive control to compare
banding patterns.
Western Blots
[0389] Conditioned media were diluted in Laemmli buffer (Sigma).
Cultured neurons were rinsed with PBS before incubation in 0.05%
trypsin in DMEM (Invitrogen), rinsed and lysed in Laemmli buffer.
All samples were boiled, separated on tris-glycine polyacrylamide
gels (Invitrogen) and transferred to nitrocellulose using iBlot
(Invitrogen). Membranes were incubated in blocking buffer (LiCor),
probed with 0.5 .mu.g/ml IPN001 antibody to tau and antibody to
.beta.-actin (1:2000; Abcam) in blocking buffer containing 0.1%
Tween-20, and anti-mouse 680 and anti-rabbit 800 secondary
antibodies (LiCor). Blots were scanned with the Odyssey SA infrared
imaging system and analyzed using Odyssey SA software (LiCor).
Tau ELISA
[0390] Media were collected after a three day conditioning period
from iPSC-derived cortical neuron cultures and assayed using an
Alphascreen homogeneous assay to measure tau. 10 .mu.g/ml anti-tau
AlphaLISA acceptor beads and 1 nM biotinylated-anti-tau antibody
were mixed with conditioned media overnight at room temperature. 40
.mu.g/ml streptavidin-donor beads (Perkin Elmer) were added for 30
minutes at room temperature and the plate read on Envision plate
reader.
eTau Purification
[0391] Conditioned media collected from iPSC-CN from AD patients
was spun at 15,000 rpm for 15 minutes, supernatants collected and
precleared on an IgG affinity resin. The precleared supernatant was
passed through an IPN002 anti-tau antibody resin, washed and eTau
eluted with 50 mM sodium citrate, pH 2.3 with 150 mM NaCl into a
tube containing 1M TBS, pH 8.3 to neutralize the pH. The eluate was
concentrated and buffer exchanged to PBS.
Immunofluorescence
[0392] MCC were rinsed with PBS, fixed in 4% paraformaldehyde,
blocked with 10% normal donkey serum (Jackson ImmunoResearch) in
PBS, permeabilized (unless otherwise specified) with 0.2%
Triton-x-100 in PBS for 15 minutes, and stained using IPN001
antibody to tau with donkey-anti-mouse-A488 secondary antibody
(Molecular Probes) and DAPI (Invitrogen). Images were acquired
using the Leica DMI 600 B microscope at 40.times. using the LAS AF
software (Leica). Confocal images were acquired using the Nikon
Eclipse Ti confocal microscope (Nikon).
Results
[0393] Assays were conducted to detect eTau fragments in various
fluids. The results are depicted in FIG. 7. As shown in FIG. 7,
left panel, endogenous tau is secreted from cortical neurons
derived from human induced pluripotent stem cells (human
iPSC-cortical neurons; iPSC-CN), where the secreted Tau is referred
to as extracellular Tau or "eTau." As shown in FIG. 7, second panel
from left, eTau is also present in conditioned media from human
primary neurons (human cortical cells; "HCC"), confirming that eTau
is not an artifact of iPSC-differentiation. These eTau fragments
were also detected in neuronal lysates, suggesting that tau is
cleaved inside neurons prior to eTau secretion.
[0394] As shown in FIG. 7, middle panel, similar tau fragments were
detected in interstitial fluid (ISF) from P301L tau mice, where
full length tau was not detected in either system. P301L mice are
transgenic for a form of human tau having a P301L mutation; P301L
mice are models for human tauopathy. See, e.g., Gotz et al. (2001)
J. Biol. Chem. 276:529; and Lewis et al. (2000) Nature Genetics
25:402.
[0395] As shown in FIG. 7, right panels, eTau levels are increased
in CSF from AD patients, and in multiple lines from familial AD
(fAD) patients compared to lines from healthy patients. As shown in
FIG. 7, right panels, eTau was also detected in CSF from PSP
patients.
Example 5
eTau Induces Neuronal Hyperactivity
Methods
[0396] Whole cell patch clamp recording from iPSC-CN cultured on
monolayer of normal human astrocytes using micro-pipette (2-5 MOhm)
were filled with solution containing (mM): K-methyl-sulfate (140),
NaCl (10), CaCl.sub.2 (1), Mg-ATP (3); Na-GTP (0.4), EGTA (0.2),
HEPES (10), Phosphocreatine (10) with adjusted pH=7.3, and
mOsm=305. Neurons were perfused (2 ml/min) with artificial cerebral
spinal fluid containing (mM): NaCl (140), KCl (2.5), MgCl.sub.2 (2)
CaCl.sub.2 (2), Hepes (10), D-Glucose (10), sucrose (20), adjusted
pH=7.4 mOsm=310. Recordings were made using pClamp-10.3 data
acquisition software (Molecular Devices) and MultiClamp 700B
amplifier (Axon Instrument; Foster City Calif.). Puff application
of eTau, or eTau with inhibitors, tetrodotoxin (TTX) (Tocris),
MK801 (Sigma), NBQX (Tocris), or anti-tau antibody, IPN001, was
performed using MiniSquirt micro-perfusion system (AutoMate,
Berkeley, Calif.). Off-line data analysis used Clampfit 10.2
analysis software (Molecular Devices). Recordings were conducted at
34-37.degree. C.
Results
[0397] To determine whether eTau can alter neuronal function,
purified eTau fragment eTau was applied to iPSC-CN or HCC. The
results are shown in FIGS. 8A-C.
[0398] As shown in FIG. 8A, addition of a purified eTau fragment
mixture onto these neurons promoted hyperactivity. As shown in FIG.
8B, hyperactivity induced by the eTau mixture was inhibited by
tetrodotoxin (TTX) and by the NMDA and AMPA glutamate receptor
antagonists, MK801 and NBQX, respectively. TTX blocks action
potentials in nerves by binding to the voltage-gated, fast sodium
channels in nerve cell membranes. These data suggest that
eTau-induced neuronal hyperactivity is dependent on action
potential-mediated release of glutamate. In contrast, as shown in
the middle panel of FIG. 8A, application of full length tau
produced no detectable changes in neuronal activity even at
substantially higher concentrations, showing that eTau-induced
hyperactivity is dependent on tau fragments. These eTau-induced
hyperactivity results strongly suggest that calcium mobilization
could be occurring in the neurons. To determine whether calcium
mobilization occurs in the neurons, the effect of eTau on calcium
mobilization was tested. As shown in FIG. 8C, eTau-1a robustly
mobilized calcium. This type of neuronal hyperactivity, if
sustained in a chronic setting such as in AD, could result in
neuronal dysfunction through altered synaptic firing and aberrant
neuronal stimulation. eTau-1a includes amino acids 2-166 of fetal
tau, i.e., amino acids 2-166 of SEQ ID NO:27.
Example 6
Anti-Tau Antibody Reduces eTau-Mediated Neuronal Hyperactivity
[0399] Electrophysiological analyses were carried out as described
in Example 5. The effect of IPN001 and IPN002 on e-Tau-mediated
neuronal hyperactivity was assessed.
[0400] As shown in FIG. 8D, IPN001 reduces eTau-mediated neuronal
hyperactivity. As shown in FIG. 19B, IPN002 reduces eTau-mediated
neuronal hyperactivity.
Example 7
Humanized Anti-Tau Antibodies
[0401] Humanized variants of IPN002 were generated. Amino acid
sequences of the heavy chain VH domains of humanized variants 1-4,
and nucleotide sequences encoding the heavy chain VH domain of the
humanized variants, are shown in FIGS. 9-12. Amino acid sequences
of the light chain VL domain of humanized variants 1-4, and
nucleotide sequences encoding the light chain VL domain of the
humanized variants, are shown in FIGS. 13-16. Amino acid
differences relative to the amino acid sequence of IPN002 are
summarized in Tables 4 and 5.
TABLE-US-00006 TABLE 4 VH Variants IPN002 Amino Acid (Parental VH
VH VH VH Position antibody) Variant 1 Variant 2 Variant 3 Variant 4
3 H H H Q Q 19 K R R R R 40 T A A A A 42 D G G G G 44 R G G G G 66
Q R R R R 83 S S N N N 85 L S L L L 86 K K R R R 87 S S A A A 93 S
S S S A 108 S S T T T
TABLE-US-00007 TABLE 5 Vk Variants IPN002 Amino Acid (Parental Vk
Vk Vk Vk Position antibody) Variant 1 Variant 2 Variant 3 Variant 4
3 L L V V V 7 T S S S S 14 S T T T T 17 D Q Q Q Q 18 Q P P P P 45 K
Q Q Q Q 48 V V V V I 83 L V V V V 85 T T T V V 104 L V V V V
[0402] Single letter amino acid codes are as follows:
G--Glycine (Gly)
P--Proline (Pro)
A--Alanine (Ala)
V--Valine (Val)
L--Leucine (Leu)
I--Isoleucine (Ile)
M--Methionine (Met)
C--Cysteine (Cys)
F--Phenylalanine (Phe)
Y--Tyrosine (Tyr)
W--Tryptophan (Trp)
H--Histidine (His)
K--Lysine (Lys)
R--Arginine (Arg)
Q--Glutamine (Gln)
N--Asparagine (Asn)
E--Glutamic Acid (Glu)
D--Aspartic Acid (Asp)
S--Serine (Ser)
T--Threonine (Thr)
Example 8
Characterization of Humanized IPN002 Variants
[0403] The relative tau binding affinities for binding to each of
the recombinant tau (383 amino acid recombinant tau) as well as to
eTau 1a, eTau 1b, eTau2, eTau3 and eTau4 for each of the 16
antibody combinations of VH#1-4 with Vk#1-4 are shown in Table 4,
which is presented in FIG. 17. The relative binding affinities for
each tau and eTau species range from 121 .mu.M to 1030 .mu.M for
each of the VH/Vk antibody combinations. eTau 1a includes amino
acids 2-166 of fetal tau, i.e., amino acids 2-166 of SEQ ID NO:27;
and eTau 1b includes amino acids 2-196 and 217-228 of fetal tau,
i.e., amino acids 2-196 and 217-228 of SEQ ID NO:27. Amino acid
sequences of eTau3 and eTau 4 are depicted in FIG. 20.
[0404] To obtain absolute affinities as well as K.sub.on and
K.sub.dis for these VH/Vk human antibodies, Octet analysis was
conducted using tau (383 amino acid recombinant tau). The K.sub.D's
ranged from 42.6 .mu.M to 2120 .mu.M. For all VH/Vk variants, the
K.sub.on values were high, and K.sub.dis values were low for Tau
and for each eTau species. The data are provided in Table 5, which
is presented in FIG. 18.
[0405] A subset of the above-described humanized IPN002 variants
was tested in additional analysis. As shown in FIG. 19A, three
variants, VH2/Vk1, VH2/Vk2, and VH2/Vk3, were used in a Western
blot assay with a variety for samples containing tau. The
tau-containing samples included iPSC-CN conditioned media; iPSC-CN
lysates; AD brain lysates; and P301L tau mouse brain cortex
lysates; and cynomologus monkey brain lysates. The data show that
the above-described humanized IPN002 variants are reactive with tau
in a variety of samples.
[0406] A subset of the above-described humanized IPN002 variants
was tested for the ability to reduce eTau-induced neuronal
hyperactivity. As shown in FIG. 19B, parental IPN002, and variants
VH2/Vk1, VH2/Vk2, and VH2/Vk3 blocked eTau induced
hyperactivity.
Example 9
Testing the Immunogenicity of Humanized IPN002 Variants
[0407] Humanized anti-tau antibody was assessed for immunogenic
potential. An EpiScreen.TM. assay was used. See, e.g., Jones et al.
(2004) J. Interferon Cytokine Res. 24:560; and Jones et al. (2005)
J. Thromb. Haemost. 3:991. Time course T cell assays were performed
using CD8.sup.+-depleted peripheral blood mononuclear cells (PBMC);
and T cell proliferation was measured by incorporation of
[.sup.3H]-thymidine at various time points after addition of test
antibody samples.
[0408] PBMC were isolated from healthy community donor buffy coats
(e.g., from blood drawn within 24 hours of testing). T cell
responses to a test antibody (e.g., a humanized IPN002 variant)
were compared to a clinical standard antibody.
[0409] Purified test antibody (humanized IPN002 variant) was added
to PBMC cultures in vitro to a final concentration of 50 .mu.g/ml
in culture medium, to generate a test sample. A clinical antibody
control (positive control), and a culture medium-only control
(unstimulated control), were included as control samples. Test
samples (PBMC plus test antibody), and control samples, were
incubated for 8 days at 37.degree. C. with 5% CO.sub.2. On days 5,
6, 7, and 7, the cells in the test and control samples were
suspended and transferred to wells of a multi-well culture plate.
The test and control samples were pulsed with 0.75 .mu.Ci
[.sup.3H]-thymidine and incubated for a further 18 hours before
harvesting onto filter mats. Counts per minute (cpm) for each well
were determined using scintillation counting.
[0410] For proliferation assays, a threshold of an SI equal to or
greater than 2 was used, where samples inducing a proliferative
response above this threshold were considered positive. SI
(Stimulation Index) is the mean test sample counts divided by the
mean of the unstimulated control.
[0411] The data are shown in FIGS. 21A-C. Healthy donor T cell
proliferation responses to a humanized IPN002 test antibody. PBMC
from bulk cultures were sampled an assessed for proliferation on
days 5, 6, 7, and 8 after incubation with the test samples.
Proliferation responses with an SI.gtoreq.2.0 (p<0.05),
indicated by the dashed horizontal line, that were significant
(p<0.05) using an unpaired, two sample student's t test were
considered positive.
[0412] As shown in FIG. 21A, a test fully humanized IPN002 antibody
had low immunogenic potential (below the SI threshold of 2.0). FIG.
21B shows results with a reference chimeric antibody, where the
reference chimeric antibody has IPN002 murine heavy and light chain
variable regions and human IgG4 constant region; and FIG. 21C shows
results with an immunogenic clinical control humanized A33
antibody.
Example 10
IPN002 Reduces the Level of Phosphorylated Tau In Vivo
[0413] The effect of IPN002 administration on the level of Tau that
is phosphorylated at amino acids 202 and 205 was assessed.
[0414] The P301L mouse model was used. P301L mice are transgenic
for a form of human tau having a P301L mutation; P301L mice are
models for human tauopathy. See, e.g., Gotz et al. (2001) J. Biol.
Chem. 276:529.
[0415] P301L mice (3-4 months old) were treated with: 1) control
IgG; 2) PHF1 anti-phosphorylated Tau antibody; or 3) IPN002. IgG
control and IPN002 antibodies were injected intraperitoneally at a
concentration of 10 mg/kg for 4 weeks; then at 20 mg/kg for a
further 4 weeks. PHF1 was administered at 10 mg/kg for the entire
8-week course. On day 60 after the beginning of the antibody
treatment regimen, the level of phosphorylated Tau was measured in
the hippocampus. The data are depicted in FIG. 22.
[0416] Tau that is phosphorylated at amino acids 202 and 205 is
referred to as "AT8." As shown in FIG. 22, treatment with IPN002
resulted in a statistically significant decrease in insoluble
phospho-Tau (AT8) as assessed by ELISA (left panel), and trending
toward a decrease as assessed by Western blot analysis (right
panel) compared to IgG control treatment. PHF1 treatment showed a
trend toward a decrease in insoluble AT8, in support of findings by
Chai et al. ((2011) J. Biol. Chem. 286:34457) and Boutajangout et
al. ((2011) J. Neurochem. 118:658).
Example 11
IPN002 Reduces Free Tau Levels in Both ISF and CSF
[0417] The effect of IPN002 administration on levels of free tau in
CSF and interstitial fluid (ISF) was determined. P301L mice were
treated as described in Example 10. The level of free tau present
in ISF that is not bound to IPN002 was determined using IPN001. As
shown in FIG. 23, IPN002 treatment reduced free Tau levels (not
bound to IPN002) (left panel) in ISF in P301L mice treated with
IPN002.
[0418] To determine whether IPN002 reduces free Tau levels in CSF
to the same extent as it does in ISF, P301L mice were treated as
described in Example 10, and the effect of IPN002 treatment on the
level of free tau (not bound to IPN002) in the CSF of the treated
mice was determined. The results are shown in FIG. 24.
[0419] In the left panel of FIG. 24, the levels of free tau
(unbound to IPN002; referred to as "Free tau (of IPN002)") in CSF
of untreated, control IgG-treated, PHF1-treated, and IPN002-treated
mice, are shown. As shown in the right panel of FIG. 24, free tau
levels in CSF is comparable to free tau levels in ISF of
IPN002-treated mice, demonstrating that ISF tau analysis correlates
well with the more clinically relevant material, CSF.
Example 12
Anti-Tau Antibody Reduces eTau-Mediated Neuronal Hyperactivity
[0420] Electrophysiological analyses were carried out as described
in Example 5. The effect of IPN002 on e-Tau-induced neuronal
hyperactivity was assessed.
[0421] As shown in FIG. 25, IPN002 reduces eTau-mediated neuronal
hyperactivity.
Example 13
Tau Fragments are Present in CSF Obtained from Individuals with
Likely Chronic Traumatic Encephalopathy (CTE)
[0422] CSF samples were obtained from former National Football
League linemen, who exhibited behavioral/cognitive deficits, and
who were considered likely to have CTE. The CSF samples were
assayed for the presence of eTau fragments. eTau fragments were
affinity isolated from pooled CSF from healthy individuals and
individuals with likely CTE. The isolated eTau fragments were
separated using polyacrylamide gel electrophoresis; and the
separated fragments were transferred to a membrane. The membrane
was probed with IPN001. The results, presented in FIG. 26, show
that Tau fragments are present in CSF obtained from individuals
with likely CTE.
Example 14
Binding of a Humanized Variant of IPN002 to Synthetic Tau
Peptides
[0423] The binding of a humanized variant of IPN002 ("hu-IPN002")
to synthetic biotinylated Tau Peptide 1 and 2 was tested in both
solid phase and solution phase assays.
[0424] The amino acid sequences of Peptide 1 and Peptide 2 are as
follows:
TABLE-US-00008 Peptide 1 (Tau amino acids 13-24): DHAGTYGLGDRK;
(SEQ ID NO: 49) Peptide 2 (Tau amino acids 15-44):
AGTYGLGDRKDQGGYTMHQDQEGDTDAGLK. (SEQ ID NO: 50)
[0425] Antibody or biotinylated peptide was diluted in
phosphate-buffered saline. The final concentrations were as
follows: 1 .mu.g/ml hu-IPN002; 1 .mu.g/ml rTau383 (full-length
recombinant Tau); 5 .mu.g/ml (biotinylated Peptide 1); and 5
.mu.g/ml (biotinylated Peptide 2). 100 .mu.l 0.1% casein in PBS was
added to wells of a multi-well plate. 150 .mu.l of the 1 .mu.g/ml
solution of hu-IPN002 was added. Serial dilutions were made. 100
.mu.l biotin-peptides were added to the wells containing serially
diluted antibody. The multi-well plate was incubated for one hour
at room temperature. After the incubation period, wells were washed
5 times with a solution of 0.05% Tween 20 in PBS; followed by 2
washes with PBS.
[0426] Streptavidin-horse radish peroxidase (HRP)-conjugated
secondary antibody was added to wells, and the plates were
incubated at room temperature for 1 hour. After the incubation
period, wells were washed 5 times with a solution of 0.05% Tween 20
in PBS; followed by 2 washes with PBS.
[0427] HRP substrate 3,3',5,5'-tetramethylbenzidine (TMB) was
added, and incubated for 1-15 minutes. The reaction was stopped by
addition of 100 .mu.l 1N sulfuric acid. Absorbance at 450 nm was
read.
[0428] The results are shown in FIGS. 27 and 28, and are summarized
in Table 6.
TABLE-US-00009 TABLE 6 Hu-IPN002 Hu-IPN002 Hu-IPN002 kD [M] kD [M]
kD [M] w/biotin-rTau383 w/biotin-Peptide 1 w/biotin-Peptide 2 solid
1.071E-10 1.062E-10 2.777E-10 phase solution 1.135E-10 1.364E-10
3.698E-10 phase
[0429] FIG. 29 depicts binding of hu-IPN002 to full-length
recombinant Tau (rTau-383) and phosphatase-activating domain (PAD)
peptide (tau amino acids 2-28; AEPRQEFEVMEDHAGTY; SEQ ID NO:80). As
shown in FIG. 29, hu-IPN002 does not bind to PAD peptide.
[0430] FIG. 30 shows that non-biotinylated Tau Peptide 1 (Tau amino
acids 13-24) and non-biotinylated Peptide 2 (Tau amino acids 15-44)
compete with biotinylated forms of Tau Peptide 1 and Tau Peptide 2
for binding to hu-IPN002. These data show that the binding of Tau
Peptide 1 and Tau Peptide 2 to hu-IPN002 is specific and not due to
the addition of the biotin.
Example 15
In Vivo Effect of IPN002 on Pathology
[0431] In this study, the effect of a therapeutic intervention on
the reduced mobility and Tau pathology in a transgenic mouse model
of tauopathy (hTau.P301L-Tg) was investigated. In these mice, a
clinical mutant of human Tau (P301L) is expressed under control of
the murine Thy1 promoter (neuron-specific expression). Behavior
(beam walk) was measured at 7, 8, 8.5 and 9 months of age as well
as the day before study termination. End-points of the study
included: (1) survival; (2) behavior: beam walk performance and
clasping score; (3) biochemistry: pan-Tau in total homogenate,
soluble and insoluble brain stem fractions; and (4) biomarkers: AT8
in total homogenate and insoluble brainstem fractions.
Materials and Methods
[0432] P301L mice (3-4 months old) were treated with: 1) control
IgG; 2) PHF1 anti-phosphorylated Tau antibody; or 3) IPN002. IgG
control and IPN002 antibodies were injected intraperitoneally at a
concentration of 20 mg/kg once a week for 6 months. PHF1 was
administered at 10 mg/kg for 6 months. PHF1 is a mouse monoclonal
antibody that recognizes an epitope that includes
phospho-Ser.sup.396 and phospho-Ser.sup.404. Santacruz et al.
(2005) Science 309:476.
Body Weights and Clasping Behavior
[0433] Body weights were determined weekly during treatment and at
sacrifice. Body weight and clasping score were recorded weekly as
of study start up to the age of 7 months. From the age of 7 months
onwards, mice were monitored twice a week for mobility in home
cage, weight loss and first signs of clasping of the hind and fore
limbs. Once clasping signs were present, body weight was determined
daily and clasping behavior was scored until moment of `premature
sacrifice`. To score clasping behavior, mice were kept
approximately 1.5 cm above their tail base for about ten seconds.
Clasping was scored for each limb separately using a 4-point rating
scale. Preliminary sacrificed mice were ascribed a maximum score.
Forelimb scores were primarily used as supporting evidence for
sacrifice decisions. The latter were made on the combined
observations of clasping, weight loss and mobility in the home cage
and according to predefined criteria. Left and right hind limb
scores unified in one clasping score were used for evaluation of
clasping evolution throughout treatment and assessment of group
differences at study termination. Mice that died prematurely from
epilepsy are excluded from the analysis. Statistical analysis were
performed using 2-way ANOVA with repeated measures followed by
Bonferroni post-hoc testing, and using Student's T-test on the
group averages of the last clasping scores before sacrifice,
respectively.
Beam Walk
[0434] The beam walk test was performed with the baseline group and
at 7, 8, 8.5, and 9 months of age, as well as the day before study
termination, with the treatment groups, to determine motor
dysfunction and motor learning. The ability of a given mouse to
balance on the beam and the time that is needed to walk over a
distance of 1 meter is a measure of their balance, coordination,
physical condition and motor-planning A copper beam with a circular
diameter of 12 mm was placed under an angle of 30.degree.. The
start area of the beam was illuminated with a desk lamp, while an
indoor escape platform was placed at the end. For the initial
training trials, a wider beam was used to train mice to balance and
walk to the platform. After the training trials, the latency of the
mice was timed over a distance of 1 m. In addition, by gait
observations, the first symptoms of motor dysfunction (foot slips
and belly dragging) were determined. Statistical analysis of
latency scores were performed using 2-way ANOVA followed by
Bonferroni post-hoc testing.
Results
Clasping Behavior and Beam Walk
[0435] The effect of IPN002 on clasping behavior is depicted in
FIG. 31. As shown in FIG. 31, IPN002 treatment reduced the clasping
score, compared to control IgG. The effect of IPN002 on motor
function, as assessed by the beam walk, is depicted in FIG. 32. As
shown in FIG. 32, IPN002 treatment significantly reduced the
average latency (and thus improved motor function), compared to
control IgG. Thus, IPN002 treatment significantly reduces the motor
deficit in P301L tau transgenic mice. Using the same statistical
method, the results with PHF1 treatment did not reach
significance.
Tau Levels
[0436] The level of free tau (tau unbound to IPN002) in the CSF of
P301L mice following treatment with control IgG, PHF1, or IPN002
was assessed. The level of free tau present in CSF that is not
bound to IPN002 was determined using IPN001. The data are shown in
FIG. 33. As shown in FIG. 33, IPN002 treatment reduced free tau
(unbound to IPN002) levels by 96%, compared to the levels in mice
treated with control IgG.
Example 16
Effect of IPN002 on eTau-Induced Neuronal Hyperexcitability
Materials and Methods
[0437] Whole cell patch clamp recording was conducted on human
primary cortical cultures. Neurons were perfused (2 ml/min) with
artificial cerebral spinal fluid containing (mM): NaCl (140), KCl
(2.5), MgCl.sub.2 (2) CaCl.sub.2 (2), Hepes (10), D-Glucose (10),
sucrose (20), adjusted pH=7.4 mOsm=310. Recordings were made using
pClamp-10.3 data acquisition software (Molecular Devices) and
MultiClamp 700B amplifier (Axon Instrument; Foster City Calif.).
Puff application of: 1) eTau 1a (amino acids 2-166); 2)
phosphorylated tau or eTau with inhibitors; 3) control IgG; or 4)
anti-tau antibodies, PHF1, IPN001, or Dako (polyclonal
anti-C-terminal tau) was performed using MiniSquirt micro-perfusion
system (AutoMate, Berkeley, Calif.). Off-line data analysis used
Clampfit 10.2 analysis software (Molecular Devices). Recordings
were conducted at 34-37.degree. C.
Results
[0438] The data are shown in FIGS. 34 and 35. As shown in FIG. 34,
IPN002 reduced eTau 1a-induced neuronal hyperactivity. Neither
control IgG nor "Dako" (anti-C-terminal polyclonal Ab) effected a
significant reduction in neuronal hyperactivity. PHF1 did not
reduce eTau 1a-induced neuronal hyperactivity.
[0439] The effect of eTau 1a on neuronal hyperactivity was compared
to the effect of full-length, PHF1-reactive, phosphorylated Tau
(phospho-Tau) on neuronal hyperactivity. As shown in FIG. 35,
middle panel, full-length, PHF1-reactive, phospho-Tau did not
induce neuronal hyperactivity in 2 of the 3 cells tested; the third
cell tested showed only a small degree of neuronal hyperactivity,
compared to baseline (top panel). In contrast, eTau 1a induced
neuronal hyperactivity in all 3 cells tested (bottom panel). These
data are depicted graphically in FIG. 36.
Example 17
Effect of IPN002 on A.delta. Levels
Materials and Methods
[0440] A.beta. Secretion from iPSC-Derived Cortical Neurons
[0441] iPSC-derived cortical neurons (iPSC-CN) were cultured in
vitro. The iPSCs were generated from healthy individuals;
individuals with familial AD with a mutation in a presenilin
protein (PSEN1); an individual with familial AD with a mutation in
a presenilin protein (PSEN2); and an individual with sporadic AD
(sAD). After approximately .about.55-60 day in culture, iPSC-CN
were sorted based on L1-CAM (CD171) expression to enrich for mature
cortical neurons; the sorted cells were grown in co-culture with
normal human astrocytes for 30 days. After co-culturing for 30
days, iPSC-CN were treated for an additional 25 days with various
concentrations of beta-site amyloid precursor protein cleaving
enzyme (BACE) inhibitor, control IgG, or IPN002, with 2.times./week
media changes. Conditioned media was collected and tested in
Millipore High Sensitivity Human Amyloid-beta 40 and Amyloid-beta
42 ELISAs, to detect A.beta..sub.1-40 ("A.beta.40") and
A.beta..sub.1-42 ("A42"). A.beta.40 and A.beta.42 are cleavage
products of amyloid precursor protein; senile plaques contain both
A.beta.42 and A.beta.40.
AD Secretion from Primary Human Cortical Neurons
[0442] Human fetal cerebral cortical tissue was obtained by
Advanced Bioscience Resources (Alameda, Calif.) and complied with
federal guidelines for fetal research and with the Uniform
Anatomical Gift Act. The tissue was rinsed in Hank's buffered
saline solution (Cellgro) and triturated in the presence of 1 mg/ml
DNase (EMD) and passed through a 100 mm cell strainer. After
centrifugation, the pellet was resuspended in 0.05% trypsin/EDTA
(Invitrogen) for 20 min at 37.degree. C. Trypsin was inactivated by
adding an equal volume of media containing 10% fetal bovine serum
(FBS) and sample gently triturated again in presence of DNase.
After centrifugation, cells were resuspended in plating media
(Neurobasal containing B27, Invitrogen) and counted. Cells were
plated, cultured for 5 weeks and fresh media added containing
antibodies at the stated concentrations for 10 days with media
changes every 3-4 days with conditioned media collected after 10
days of treatment. Conditioned media was spun at 15,000 rpm for 15
minutes prior to processing for A.beta.40 and A.beta.42 ELISA
analysis, as described above.
Results
[0443] The results are shown in FIGS. 37-39.
[0444] As shown in FIG. 37, treatment of iPSC-CN with IPN002
reduced the levels of A.beta.40 and A.beta.42 secreted by all
iPSC-CN, whereas control IgG did not reduce A.beta.40 or A.beta.42
secretion.
[0445] FIG. 38 shows dose-dependent effects of various antibodies
on the amount of A.beta.40 secreted by primary human cortical
neurons. As shown in FIG. 38, incubation of primary human cortical
neurons with 10 .mu.g/ml or 30 .mu.g/ml IPN001, IPN002, or
hu-IPN002 (humanized variant of IPN002) reduced the amount of
A.beta.40 secreted. Neither control IgG nor PHF1 had any
significant effect on the amount of A.beta.40 secreted.
[0446] FIG. 39 shows dose-dependent effects of various antibodies
on the amount of A.beta.42 secreted by primary human cortical
neurons. As shown in FIG. 39, incubation of primary human cortical
neurons with 10 .mu.g/ml or 30 .mu.g/ml IPN001, IPN002, or
hu-IPN002 reduced the amount of A.beta.42 secreted. Neither control
IgG nor PHF1 had any significant effect on the amount of A.beta.42
secreted.
Example 18
Epitope Mapping of a Humanized Variant of IPN002
Materials and Methods
[0447] Antibody or biotinylated peptide was diluted in
phosphate-buffered saline (PBS). The final concentrations were as
follows: 1 .mu.g/ml humanized variant of IPN002 (hu-IPN002); 1
.mu.g/ml rTau383 (full-length recombinant Tau); 5 .mu.g/ml
biotinylated Peptides. 100 .mu.l 0.1% casein in PBS was added to
wells of a multi-well plate. 150 .mu.l of the 1 .mu.g/ml solution
of hu-IPN002 was added. Serial dilutions of hu-IPN002 were made,
and were coated onto wells of a multi-well plate. 100 .mu.l
biotin-peptides or biotin-full-length Tau were added to the wells
containing serially diluted antibody. The multi-well plate was
incubated for one hour at room temperature. After the incubation
period, wells were washed 5 times with a solution of 0.05% Tween 20
in PBS; followed by 2 washes with PBS.
[0448] Streptavidin-horse radish peroxidase (HRP)-conjugated
secondary antibody was added to wells, and the plates were
incubated at room temperature for 1 hour. After the incubation
period, wells were washed 5 times with a solution of 0.05% Tween 20
in PBS; followed by 2 washes with PBS.
[0449] HRP substrate 3,3',5,5'-tetramethylbenzidine (TMB) was
added, and incubated for 1-15 minutes. The reaction was stopped by
addition of 100 .mu.l 1N sulfuric acid. Absorbance at 450 nm was
read.
Results
[0450] The data are shown in FIG. 40. The data presented in FIG. 40
show that biotin-Tau 13-24, biotin-Tau 15-24, biotin-Tau 15-44, and
biotin-phospho Tau 15-24 (with a phosphorylated Tyr corresponding
to amino acid 18 of full-length Tau), and full-length Tau (rTau383)
all bound efficiently to hu-IPN002. Thus, hu-IPN002 binds an
epitope within Tau amino acids 15-24, regardless of the
phosphorylation status of Tyr-18.
Example 19
Antibody Binding to Tau in CSF
[0451] Binding of IPN002, PHF1, an antibody specific for a linear
phosphorylated epitope, and control antibody, to tau present in CSF
was assessed.
[0452] A binding assay to identify antibodies that bind tau present
in CSF was developed. The assay is depicted schematically in FIG.
41. Control IgG, polyclonal antibody specific for a linear
phosphorylated epitope ("polyAb-C-terminal tau"), PHF1, or IPN002
was coated on wells of a multi-well plate. Antibody was diluted in
phosphate-buffered saline (PBS). The final concentrations were as
follows: 5 .mu.g/ml IPN002, IgG, PHF1, or polyAb-C-terminal tau.
100 .mu.l 0.1% casein in PBS was added to wells of a multi-well
plate. 100 .mu.l human CSF was added and incubated for 1 hour at
RT. 100 .mu.l biotin-BT2+biotin-HT7 were added to the wells. BT2 is
a mouse monoclonal antibody that binds an epitope within amino
acids 194-198 of human tau. HT7 is a mouse monoclonal antibody that
binds an epitope within amino acids 159-163 of human tau. The
multi-well plate was incubated for one hour at room temperature.
After the incubation period, wells were washed 5 times with a
solution of 0.05% Tween 20 in PBS; followed by 2 washes with
PBS.
[0453] Streptavidin-horse radish peroxidase (HRP)-conjugated
secondary antibody was added to wells, and the plates were
incubated at room temperature for 1 hour. After the incubation
period, wells were washed 5 times with a solution of 0.05% Tween 20
in PBS; followed by 2 washes with PBS. HRP substrate
3,3',5,5'-tetramethylbenzidine (TMB) was added, and incubated for
1-15 minutes. The reaction was stopped by addition of 100 .mu.l 1N
sulfuric acid. Absorbance at 450 nm was read.
[0454] The assay was quantitated using known amounts of full-length
phospho-tau or known amounts of eTau 1a (amino acids 2-166 of tau).
As shown in FIG. 41, lower panel, the assay was carried out using
full-length tau (lower left panel) or eTau-1a (lower right panel),
in concentrations of 0 ng/ml, 0.16 ng/ml, 0.8 ng/ml, 4 ng/ml, 20
ng/ml, and 100 ng/ml. As shown in FIG. 41, lower left panel,
IPN002, polyAb-C-terminal tau, and PHF1 bind full-length tau. As
shown in FIG. 41, lower right panel, only IPN002 binds eTau 1a.
[0455] The above-described assay was carried out to test binding of
polyAb-C-terminal tau, PHF1, and IPN002 to tau present in human CSF
from: 1) control (healthy) patients; 2) MCI patients; 3) patients
with mild AD ("mild"); 4) patients with moderate AD ("moderate");
and patients with severe AD. The results are shown in FIG. 42. As
shown in FIG. 42, tau present in CSF is bound by IPN002, but not by
pAb-tau linear epitope or by PHF1. The data show that: 1)
N-terminal Tau fragments are present in CSF; 2) full-length tau was
detected in CSF; and 3) no C-terminal tau fragments that include
BT2 and HT7 epitopes were detected in CSF.
Example 20
In Vivo Effects of IPN002
[0456] Results were obtained from a six month tau antibody efficacy
study in P301L tau transgenic mice. It was found that IPN002
globally reduces disease progression, as exemplified by
dramatically lowered free tau levels in the CSF, reduced levels of
a protein marker of astrogliosis, improvement in tau pathology
across multiple brain regions and phosphotau epitopes, and improved
behavioral/functional read outs. IPN002 performed as well or better
than the anti-tau antibody PHF1. Finally, in vivo confirmation was
obtained for a novel secreted tau mechanism-of-action: positive
feedback regulation of amyloid-beta levels. This study clearly
distinguished the ability of the eTau antibody, IPN002, compared to
PHF1, to modulate amyloid beta levels.
Materials and Methods
Animal Studies
[0457] The P301L transgenic mouse model was used. The P301L
transgenic mouse includes a murine Thy1 promoter (neuron-specific
expression) expression driven 4R2N human tau mutated at P301L as a
transgene. The P301L transgenic model displays an age-dependent
hyperphosphorylation of tau (AT8 and AT100) in spinal cord,
brainstem, midbrain and cortex. The hyperphosphorylated tau shows
conformational changes which lead to tau aggregation and mice
develop neurofibrillary tangles from the age of 6 months, although
with a high variability of onset. Concomitant to the pathology,
these mice progressively develop motoric deficits such as hind limb
clasping, decreased mobility on beam walk and require premature
sacrifice at the age range between 8-11 months. Terwel et al.
(2005) Proc. Natl. Acad. Sci. USA 280:3963.
[0458] 100 randomized mice were dosed i.p. weekly with antibody
from 3.5 months of age for 6 months through 9.5 months of age. 20
mg/kg (mpk) IPN002 treatment was compared to a negative control
antibody, 20 mpk IgG1, and to an anti-tau antibody, 10 mpk PHF1.
PHF1 is a mouse monoclonal antibody that recognizes an epitope that
includes phospho-Ser.sup.396 and phospho-Ser.sup.404. Santacruz et
al. (2005) Science 309:476. Living mice were examined for clasping
deficits and on beam walk performance. Mice that rapidly progressed
to end-stage disease were prematurely sacrificed (prior to 9.5
months of age) using predetermined criteria. Serum, CSF,
hippocampus, cortex, mid-brain and hind brain were obtained; and
hemibrains were sagittally sectioned for histopathology. Antibody
levels were measured in serum and CSF; total tau and free tau (tau
not bound to IPN002; "free of IPN002" tau) were measured in CSF;
biochemical/histological analyses on human and mouse tau were
conducted; and mouse amyloid-beta, inflammatory and synaptic
protein markers and gene expression changes in inflammatory,
synaptic and neuronal activity markers were analyzed. All analyses
were conducted in a blinded manner.
[0459] The numbers of mice dedicated to this study were 25-33 mice
per study arm and 10 for baseline. All mice reserved for this study
were given a random number by computer and allocated randomly to a
treatment. The mouse groups are shown in Table 7.
TABLE-US-00010 TABLE 7 Group N Strain Treatment 1 10 hTau.P301L-Tg
None (baseline group) 2 32 hTau.P301L-Tg 20 mpk mIgG1 in vehicle 3
25 hTau.P301L-Tg 10 mpk PHF1 in vehicle 4 33 hTau.P301L-Tg 20 mpk
IPN002 in vehicle
[0460] All animal experiments were conducted in accordance with
bioethical guidelines that are fully compliant to internationally
accepted principles for the care and use of laboratory animals.
Table 8 provides the treatment parameters.
TABLE-US-00011 TABLE 8 Administration route i.p. Dosing volume,
concentration 10 ml/kg; 1 mg/ml; 10 mpk/day Frequency of treatment
Once per week Duration of treatment Up to 6 months dependent on
survival Allocation to treatment group Randomized
[0461] Body weights were determined weekly during treatment and at
sacrifice. Clasping scores were recorded weekly from 7 months of
age onward. From 7 months of age onward, mice were monitored twice
a week for mobility in cage, weight loss and first signs of
clasping of the hind limbs.
[0462] Clasping Behavior.
[0463] To score clasping behavior, mice were kept by the base of
their tail for ten seconds. Hind limb clasping is scored using a
3-point rating scale: 0. Hind limbs stretched and toes spread. 1.
One hind limb partially retracted >50% of the time. 2. Both hind
limbs partially retracted >50% of the time. 3. Both hind limbs
retracted completely during >50% of the time. Forelimb clasping
is scored according to 0. Forelimbs stretched forward and distant
from body. 1. One forelimb partially retracted >50% of the time.
2. Both forelimbs partially retracted >50% of the time. 3. Both
forelimbs completely retracted, immobile, muscle loss, mouse is
"praying". The mice showing severe clasping phenotype were early
sacrificed.
[0464] Beam Walk.
[0465] The beam walk was performed at 7 months, 8 months, 8.5
months, 9 months, and 8.5 months of age to determine motor
dysfunction and motor learning. The ability of a mouse to balance
on the beam and the time needed to walk 1 meter is a measure of its
balance, coordination, physical condition, and motor-planning A
copper beam with a circular diameter of 12 mm was placed at an
angle of 30.degree.. The start area was illuminated and an indoor
escape platform was placed at the far end. After the training
trials, the latency of the mice was timed. In addition, foot slips
and belly dragging were counted.
[0466] The baseline group was sacrificed prior to study initiation.
Mice in the study arms that displayed severe clasping, reduced body
weight and/or became moribund were prematurely sacrificed (early
sacrifice). The remaining mice were sacrificed after 6 months of
treatment (late sacrifice).
TABLE-US-00012 TABLE 9 Anaes- A mixture of ketamine, xylazine 2%,
atropine and saline/ thesia isoflurane. Perfusion The thoracic
cavity was accessed for perfusion via trans- cardial perfusion with
ice-cold saline for 3 minutes via the left ventricle. The right
atrium was cut as an outflow route. Left Dissected into
hippocampus, cortex, midbrain, cerebellum hemisphere and brainstem
and rest, frozen in liquid nitrogen. Right Post-fixed overnight in
PBS with 4% paraformaldehyde and hemisphere stored in PBS with 0.1%
sodium azide at 4.degree. C. CSF Collected via incision in the neck
muscles between the skull and the first cervical vertebrae. The
cisterna magna was punctured with a 26 gauge needle and 10-20 ul
CSF collected, centrifuged at 10,000 .times. g at 4.degree. C. and
stored at -80.degree. C. Blood/ Collected via heart puncture into
EDTA-tubes, centrifuged plasma at 2000 .times. g at 4.degree. C.
for 15 minutes and stored at -70.degree. C. Body Measured at
sacrifice weight
[0467] Free PHF1 in plasma was measured by adding appropriately
diluted plasma to tau-coated plates and detecting using an ELISA
with HRP-anti-mouse IgG antibody and TMB. The sensitivity of the
Free PHF1 assay was insufficient to measure free PHF1 levels in the
CSF.
[0468] Free IPN002, in plasma and in CSF, was measured by adding
appropriately diluted plasma or CSF to tau-coated plates and
detecting using an ELISA with HRP-anti-mouse IgG antibody and
TMB.
[0469] Total tau in CSF was measured using a sandwich ELISA using
both coating anti-tau antibody and detecting anti-tau antibodies
that were demonstrated to not compete with either IPN002 or
PHF1.
[0470] Free tau (of IPN002) in CSF was measured using a homogenous
ELISA using two anti-tau antibodies to capture the tau in CSF. One
of these antibodies competes with IPN002 and therefore will not
interact with the tau that is previously bound to IPN002 in the
CSF.
[0471] Hippocampus and cortex was fractionated by homogenizing in
10 weight volumes of cold TBS/Roche protease/phosphatase inhibitor
cocktail. The homogenate was generated by spinning debris out at
10,000.times.g for 15 minutes. BCA protein content was conducted on
homogenates; all homogenates were diluted to 1 mg/ml and
corresponding fractions diluted equivalently. A portion of the
homogenate was spun 1 hour at 100,000.times.g at 4.degree. C. to
generate a soluble fraction (S1) and insoluble pellet. The
insoluble pellets were resuspended in 1% Sarkosyl/Roche
protease/phosphatase inhibitor cocktail and spun again for 1 hour
at 100,000.times.g. The Sarkosyl solubilized supernatants were
labeled (P1); the Sarkosyl insoluble pellet was resuspended and was
labeled (P2). The hindbrains were similarly fractionated, except
high salt (0.85M NaCl) followed by 1% Sarkosyl was used to
solubilize the P1 pellets.
[0472] The human tau homogenous ELISA specifically reports on human
tau and was used to determine human tau levels in the homogenate,
51, P1 and P2 fractions in hippocampus, cortex and hindbrain.
[0473] The human AT8 homogenous ELISA specifically reports on human
p202/205 tau and was used to determine human AT8 levels in the
homogenate, 51, P1 and P2 fractions in hippocampus, cortex and
hindbrain.
[0474] HT7, IPN001, Dako polyclonal-tau, AT8, AT100, anti-p262,
anti-p396 and AD2, GFAP, Iba1, synapsin SDS-PAGE Western blots were
conducted on hippocampus, cortex and/or hindbrain fractions
(Homogenate, 51, P1 and/or P2). One or more lysate controls were
run on each gel to ensure proper normalization between gels. All
analyzed bands were normalized to .beta.-actin in the corresponding
homogenate sample. Antibodies and their targets are shown in Table
10.
TABLE-US-00013 TABLE 10 Antibody Target IPN001 Tau and eTau HT7
Human tau Dako polyclonal tau Human and mouse tau AT8 Human and
mouse p202/205 (phosphorylated at Ser202 and Thr205) tau AT100
Human and mouse p212 (phosphorylated at Ser212) tau Anti-p262 Human
p262 (phosphorylated at Ser262) tau AD2 Human and mouse p396
(phosphorylated at Ser396) tau p396 Human and mouse p396
(phosphorylated at Ser396) tau glial fibrillary acidic Mouse GFAP
on astrocytes protein (GFAP) ionized calcium binding Mouse Iba1 on
microglia adaptor molecule 1 (Iba1) Synapsin Mouse synapsin
(synaptic protein)
[0475] For histopathology, 6/32 randomized, sagittally sectioned
hemibrains were stained for AT8 and AT100; signals were developed
with DAB. Both the Subthalamic nucleus annex zona incerta (bregma
2.08-1.12) and the Interposed nucleus of the cerebellum (anterior
and posterior part) annex lateral cerebellar nucleus (IntA/P/LAT;
bregma 2.28-1.32) were quantified (blinded).
[0476] Mouse amyloid-beta ELISAs (both A.beta.40 and A.beta.42)
were conducted for specific detection of A.beta.40 and A.beta.42 in
mouse brain homogenates. The mouse A.beta.42 ELISA was not
sensitive enough to reliably detect levels in mouse brain
homogenates. The mouse A.beta.40 ELISA detected mouse A.beta.40
levels well within the linear range of the assay. The mouse
A.beta.40 ELISA was used to determine A.beta.40 levels in all
cohort homogenates and soluble (S1) fractions.
[0477] Taqman analysis was conducted on markers of inflammation,
synaptic markers and markers of neuronal activity. Table 11 lists
the markers.
TABLE-US-00014 TABLE 11 Gene Function APP Amyloid precursor
protein: mutated/causal in some fAD patients Human Tau MTB protein;
aggregates in AD Arc Neuronal activity Synapsin Synaptic protein
Synaptophysin Synaptic protein Calbindin Synaptic protein
Neuropeptide Y Neuronal activity Cox2 Inflammation GFAP
Inflammation-astrocyte Iba1 Inflammation-microglia IL-1b
Inflammation P67phox Inflammation Pg91phox Inflammation PBR1
Inflammation TNFa Inflammation
Statistics
[0478] Clasping and Beam walk Longitudinal statistical analysis was
conducted by an independent statistician. In brief, the slope of
the curve of decline was determined for each mouse both for
clasping deficit and beam walk and these coefficients used to
determine if significant differences existed between groups.
Multiple methods were used to determine the slope of the curves and
significance. For clasping these included Longitudinal Complete
Case Analysis, Joint Model Adjusting for Missing Data and Bayesian
Ordered Longitudinal Analysis. For Beam walk these included
Longitudinal Complete Case Analysis, Joint Model Adjusting for
Missing Data, Longitudinal Analysis using 30 Second Values,
Bayesian Longitudinal Analysis with Missing Values and Alive but
Non-cross Analysis.
[0479] Statistical analysis to determine significance for
biochemistry, histology and gene expression was conducted on whole
cohort, early sacrifice and late sacrifice cohorts using one-way
ANOVA followed by Dunnett's post-hoc analysis. The t-test was also
conducted for disease progression (3.5 month baseline vs 9.5 month
IgG treated arms) as a comparator to significance derived from
one-way ANOVA analysis. When PHF1 or IPN002 appeared to be greatly
trending toward changes but not reflecting this by one-way ANOVA
analysis, t-test comparing IgG to PHF1 or IPN002 was conducted
solely to determine if trending patterns were emerging for that
endpoint without reaching one-way ANOVA significance.
[0480] To determine which of the 116 endpoints best correlate with
each other, a matrix correlation was conducted; and the highest
correlators were rank ordered based on a combination of their
r.sup.2 values and p values.
Results
Antibody Levels and Target Engagement
[0481] Plasma and CSF were obtained prior to sacrifice. The levels
of Free IPN002 and Free PHF1 in plasma, and Free IPN002 in the CSF,
were determined. The Free PHF1 assay was not sensitive enough to
measure Free PHF1 levels in the CSF. Sufficient CSF was also
obtained to determine levels of both Total Tau and Free Tau (free
of IPN002).
Plasma Free IPN002 and Free PHF1 Levels
[0482] P301L Tau transgenic mice were treated with 20 mpk IgG, 20
mpk IPN002 or 10 mpk PHF1. These dosages were chosen based on
results from the Target Engagement #1 study. Summary data are shown
in Table 12.
TABLE-US-00015 TABLE 12 Target Engagement Study #1 Efficacy Study
Average Average Free Anti- Free Anti- Anti- Dose body levels Dose
body levels body administered (Plasma) administered (Plasma) IPN002
10 mpk for 0.65 .mu.M 20 mpk for 0.9 -/+ 4 wks-> 26 weeks 0.26
.mu.M 20 mpk for 4 wks PHF1 10 mpk for 0.65 .mu.M 10 mpk for 0.55
-/+ 8 wks 26 weeks 0.05 .mu.M
[0483] It was found in Target Engagement #1 that 10 mpk IPN002 for
4 weeks followed by 20 mpk IPN002 for an additional 4 weeks
resulted, on average, in 0.65 .mu.M Free IPN002 in the plasma. The
same concentration, 0.65 .mu.M Free PHF1, was obtained with
constant 10 mpk PHF1 throughout the 8 weeks. In the current study,
as shown in Table 12, the average plasma concentrations were 0.55
.mu.M Free PHF1 and 0.9 .mu.M IPN002. Thus, the average levels for
Free IPN002 were higher than Free PHF1 in plasma.
CSF Free IPN002 Levels
[0484] On average, 0.9 nM Free IPN002 was present in the CSF of
IPN002-treated P301L tau mice, as shown in Table 13. This
translates to 0.1% Free IPN002 in CSF:plasma; i.e., the
concentration of IPN002 in the CSF was 0.1% of the concentration of
IPN002 in plasma (0.9 nM in CSF; 0.9 .mu.M in plasma). 0.1%
antibody in CSF is consistent with percentages determined for other
antibodies in accessing the brain and draining into CSF subsequent
to peripheral administration. The Free IPN002 assay, however, only
reports on IPN002 that is not bound to tau. Tau is bound to IPN002
in the CSF; thus, the 0.1% value underrepresents total IPN002 in
the CSF. Calculations adding Free IPN002 levels to IPN002 levels
bound to tau suggested that the total IPN002 levels in CSF are
.about.0.2% of plasma levels. As noted in the Methods, the Free
PHF1 assay is not sufficiently sensitive to measure CSF levels of
Free PHF1.
TABLE-US-00016 TABLE 13 Efficacy Study Average Free Antibody
Average Free Antibody Antibody (Plasma) (CSF) Free 0.9 -/+ 0.26
.mu.M 0.9 -/+ 0.28 nM IPN002
Total Tau in CSF
[0485] The levels of Total Tau in the CSF were measured to
determine if either PHF1 or IPN002 altered these levels. As shown
in FIG. 43, the levels of total tau in CSF were not significantly
altered by PHF1 or IPN002 treatment. This result was expected from
the data obtained in the Target Engagement Study.
[0486] FIG. 43: Total tau levels in the P301L tau transgenic mice
CSF were measured using a tau antibody sandwich ELISA assay. As
shown in FIG. 43, tau levels in the CSF significantly increased
with age (compare 3 month baseline to mouse IgG). Neither PHF1 nor
IPN002 altered total tau levels.
Free Tau (of IPN002) in CSF
[0487] The Free Tau (of IPN002) in CSF assay, as described in
Methods, is an ELISA in which one of the two tau antibodies
competes with IPN002; therefore, the assay will not detect tau that
is bound to IPN002. This assay indicates whether IPN002 has entered
the brain and CSF and has engaged its target (i.e., has bound to
tau). If IPN002 has engaged its target, the signal in the assay
will be lowered. This assay is specific to free tau of IPN002, and
therefore does not detect Free Tau (of PHF1). As shown in FIG. 33,
Free Tau (of IPN002) levels increase with disease progression
consistent with the data shown above. PHF1 does not affect Free Tau
levels. In contrast, IPN002 treatment resulted in a 96% reduction
in levels of the Free Tau (of IPN002) signal. These data show that
IPN002 has fully engaged its target, CSF tau.
Tau and PhosphoTau Biochemistry and Histology
[0488] As described in Methods, hippocampus, cortex, and hindbrain
were fractionated into homogenate, soluble (Sarkosyl solubilized),
and insoluble (Sarkosyl insoluble) fractions. The fractions were
analyzed for both human and mouse tau, and for multiple phosphotau
epitopes (AT8, AT100, p262, p396 and AD2) that are
hyperphosphorylated in Alzheimer's disease brains As shown in FIGS.
44 A-H, IPN002 treatment reduced AT8 levels in the hippocampal
homogenate (FIG. 44A), hippocampal S1 fraction (FIG. 44B),
hippocampal P1 fraction (FIG. 44C), hippocampal P2 fraction (FIG.
44D), cortical homogenate (FIG. 44E), and cortical P1 fraction
(FIG. 44G), compared to treatment with mouse IgG control antibody.
The data in FIG. 44A-H show that IPN002 treatment reduced AT8
levels to a similar or greater degree than PHF1 treatment. The data
depicted in FIGS. 44A-H were normalized to BCA.
[0489] As shown in FIG. 45A, IPN002 treatment reduced the level of
human p396-tau in the cortex S1 fraction, compared to treatment
with mouse IgG control antibody. As shown in FIGS. 45B and 45C,
IPN002 treatment reduced the level of phospho-tau S262 in the
cortex homogenate (FIG. 45B), and in the cortex S1 fraction (FIG.
45C), compared to treatment with mouse IgG control antibody. As
shown in FIGS. 45D and 45E, treatment with IPN002 reduced the level
of mouse p396-tau in the cortex S1 fraction (FIG. 45D), and reduced
the level of mouse AT100 in the cortex S1 fraction (FIG. 45E),
compared to treatment with mouse IgG control antibody.
[0490] Tau histopathology (AT8 and AT100) was analyzed in two
distinct nuclei within the hindbrain, the Subthalamic nucleus annex
zona incerta (STH) and the Interposed nucleus of the cerebellum
(anterior and posterior part) annex lateral cerebellar nucleus
(IntA/P/LAT). As shown in FIG. 46, IPN002, in the late sacrifice
mice, significantly improved AT8 disease pathology. PHF1 trended
toward a decrease, but did not significantly improve, tau
histopathology. As shown in FIG. 47, IPN002 treatment improved
AT100 and MC1 disease pathology, compared to treatment with control
IgG.
Inflammation
[0491] Both astrogliosis and microgliosis develop in models of AD
and tauopathies. The role that activated astrocytes or microglia
play in disease, however, is not entirely clear. If astrocytes or
microglia are activated in the P301L tau transgenic model, such
activation would result from mutated tau overexpression. It is
hypothesized that secreted tau induces AD pathology. If secreted
tau induces AD pathology, then it might also induce glial
activation. As such, it was determined whether the proteins that
are increased in astrogliosis (GFAP) or microgliosis (Iba1) are
increased in the P301L transgenic mouse model.
[0492] As shown in FIGS. 48A and 48B, GFAP protein levels are
increased with disease progression in both the hippocampus and
cortex. These data indicate either that astrocytes are activated in
the hippocampus and cortex or that they have infiltrated these
brain regions. IPN002 treatment significantly reduced GFAP protein
levels in both the hippocampus and cortex, showing that IPN002
treatment reduced the disease-related increase in astrogliosis.
PHF1 significantly reduced GFAP in the hippocampus but not in the
cortex.
[0493] Iba1 protein levels, a marker for microglia, were measured
in both hippocampus and cortex. As shown in FIGS. 49A and 49B, Iba1
is not increased with disease progression in the hippocampus but is
increased in the cortex. IPN002 treatment had no effect on disease
progression of Iba1 protein levels. In contrast, PHF1 treatment did
significantly reduce Iba1 protein levels. The data suggest
different mechanisms of action for IPN002 and PHF1.
Modulation of Amyloid-Beta Level
[0494] As shown in Example 17, treatment of iPSC-CN with IPN002
reduced the levels of A.beta.40 and A.beta.42 secreted by all
iPSC-CN, whereas control IgG did not reduce A.beta.40 or A.beta.42
secretion. It was then determined whether IPN002 also modulates
A.beta. levels in vivo. In the P301L mouse model, there is no over
overexpression of human APP; therefore, mouse A.beta. levels were
measured. The sensitivity of the mouse A.beta.42 ELISA was not
sufficient to measure A.beta.42 levels in these homogenates. The
mouse A.beta.40 ELISA, however, was sufficiently sensitive and was
therefore used to determine mouse A.beta.40 levels in the
homogenates and supernatant fractions. Mouse A.beta.40 levels
increase with disease progression. The observed increase in
A.beta.40 levels could be tau dependent and/or age dependent. As
shown in FIGS. 50A and 50B, IPN002 treatment lowered A.beta.40
levels in both the homogenate (FIG. 50A) and soluble fraction (FIG.
50B).
[0495] The data in FIGS. 50A and 50B show that tau overexpression
(perhaps in conjunction with aging) drives a disease progression
associated increase in A.beta.40 levels. The data suggest that
secreted tau is the causal factor in driving the increase in
A.beta. levels, which IPN002 in turn inhibits by blocking eTau
function. PHF1, in contrast, a non-eTau binding antibody, has no
effect on A.beta. levels.
Motor Function
[0496] The effect of IPN002 treatment on motor function, as
assessed by the clasping and the beam walk tests, was determined.
The data are shown in FIGS. 31, 32, 51, and 52.
[0497] As shown in FIG. 31, IPN002 treatment improved clasping
scores, compared to treatment with mouse IgG control.
[0498] As shown in FIGS. 32 and 51, IPN002 treatment improved
average latency in the beam walk test (FIG. 32), and reduced the
percent of mice unable to walk the beam (FIG. 51), compared to
treatment with mouse IgG control.
Example 21
Epitope Mapping
[0499] Peptide binding and competition assays were carried out as
described in Example 18, above.
[0500] The following peptides were used:
TABLE-US-00017 IPIG-1: EVMEDHAGTYGLGDRK (SEQ ID NO: 81; amino acids
9-24 of tau); IPIG-2: DHAGTYGLGDRK (SEQ ID NO: 49; amino acids
13-24 of tau); IPIG-3: AGTYGLGD (SEQ ID NO: 82; amino acids 15-22
of tau); IPIG-4: AGTYGLGDRKDQGGYTMHQDQEGDTDAGLK (SEQ ID NO: 50;
amino acids 15-44 of tau); PAD AEPRQEFEVMEDHAGTY peptide: (SEQ ID
NO: 80; amino acids 2-18 of tau).
[0501] The results are shown in FIGS. 53-55.
[0502] FIG. 30 shows that unbiotinylated tau peptides compete with
biotinylated forms of tau. The upper panel shows competition of
biotinylated Tau 13-24 peptide (IPIG-2; SEQ ID NO:49) with
unbiotinylated Tau 13-24 for binding to hu-IPN002.
[0503] FIG. 52 shows that full-length tau, IPIG-1, IPIG-2, and
IPIG-4 were bound by hu-IPN002. IPIG-3, which lacks resides 23 and
24, was not bound by hu-IPN002, nor was PAD. Thus, residues 23 and
24 appear to be required for hu-IPN002 binding.
[0504] FIG. 53 shows that eTau-4 peptide binds hu-IPN002; however,
PAD (tau 2-18), Tau 15-22, Tau 19-28, and Tau 21-31 peptides did
not bind hu-IPN002.
[0505] The data indicate that residues 15-24 appear to be necessary
for hu-IPN002 binding.
[0506] While the present invention has been described with
reference to the specific embodiments thereof, it should be
understood by those skilled in the art that various changes may be
made and equivalents may be substituted without departing from the
true spirit and scope of the invention. In addition, many
modifications may be made to adapt a particular situation,
material, composition of matter, process, process step or steps, to
the objective, spirit and scope of the present invention. All such
modifications are intended to be within the scope of the claims
appended hereto.
Sequence CWU 1
1
86116PRTArtificial sequenceSynthetic amino acid sequence 1Arg Ser
Ser Gln Thr Ile Leu His Ser Asn Gly Asn Thr Tyr Leu Glu 1 5 10 15
27PRTArtificial sequenceSynthetic amino acid sequence 2Lys Val Ser
Lys Arg Phe Ser 1 5 39PRTArtificial sequenceSynthetic amino acid
sequence 3Phe Gln Gly Ser Leu Val Pro Trp Ala 1 5 45PRTArtificial
sequenceSynthetic amino acid sequence 4Ser Tyr Gly Met Ser 1 5
517PRTArtificial sequenceSynthetic amino acid sequence 5Thr Ile Ser
Ser Ser Gly Ser Arg Thr Tyr Phe Pro Asp Ser Val Lys 1 5 10 15 Gly
68PRTArtificial sequenceSynthetic amino acid sequence 6Thr Trp Asp
Gly Ala Met Asp Tyr 1 5 716PRTArtificial sequenceSynthetic amino
acid sequence 7Lys Ser Ser Gln Ser Ile Val His Ser Asn Gly Asn Thr
Tyr Leu Glu 1 5 10 15 87PRTArtificial sequenceSynthetic amino acid
sequence 8Lys Val Ser Asn Arg Phe Ser 1 5 99PRTArtificial
sequenceSynthetic amino acid sequence 9Phe Gln Gly Ser Leu Val Pro
Trp Ala 1 5 105PRTArtificial sequenceSynthetic amino acid sequence
10Lys Tyr Gly Met Ser 1 5 1117PRTArtificial sequenceSynthetic amino
acid sequence 11Thr Ile Ser Ser Ser Gly Ser Arg Thr Tyr Tyr Pro Asp
Ser Val Lys 1 5 10 15 Gly 128PRTArtificial sequenceSynthetic amino
acid sequence 12Ser Trp Asp Gly Ala Met Asp Tyr 1 5
13112PRTArtificial sequenceSynthetic amino acid sequence 13Asp Val
Leu Met Thr Gln Thr Pro Leu Ser Leu Ala Val Asn Leu Gly 1 5 10 15
Asp Gln Ala Ser Leu Ser Cys Arg Ser Ser Gln Thr Ile Leu His Ser 20
25 30 Asn Gly Asn Thr Tyr Leu Glu Trp Tyr Leu Gln Lys Pro Gly Gln
Ser 35 40 45 Pro Arg Leu Leu Ile Tyr Lys Val Ser Lys Arg Phe Ser
Gly Val Pro 50 55 60 Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp
Phe Thr Leu Lys Ile 65 70 75 80 Ser Arg Val Glu Ala Asp Asp Leu Gly
Ile Tyr Tyr Cys Phe Gln Gly 85 90 95 Ser Leu Val Pro Trp Ala Phe
Gly Gly Gly Thr Lys Leu Glu Ile Lys 100 105 110 14117PRTArtificial
sequenceSynthetic amino acid sequence 14Glu Val Gln Leu Val Glu Ser
Gly Glu Asp Leu Val Lys Pro Gly Gly 1 5 10 15 Ser Leu Lys Leu Ser
Cys Val Ala Ser Gly Phe Ala Phe Ser Ser Tyr 20 25 30 Gly Met Ser
Trp Val Arg Gln Thr Pro Asp Met Arg Leu Glu Trp Val 35 40 45 Ala
Thr Ile Ser Ser Ser Gly Ser Arg Thr Tyr Phe Pro Asp Ser Val 50 55
60 Lys Gly Arg Leu Thr Ile Ser Arg Asp Asn Asp Lys Asn Ile Leu Tyr
65 70 75 80 Leu Gln Met Ser Ser Leu Arg Ser Glu Asp Thr Ala Met Tyr
Tyr Cys 85 90 95 Thr Ile Thr Trp Asp Gly Ala Met Asp Tyr Trp Gly
Arg Gly Ile Ser 100 105 110 Val Thr Val Ser Ser 115
15112PRTArtificial sequenceSynthetic amino acid sequence 15Asp Val
Leu Met Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly 1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Lys Ser Ser Gln Ser Ile Val His Ser 20
25 30 Asn Gly Asn Thr Tyr Leu Glu Trp Tyr Leu Gln Lys Pro Gly Gln
Ser 35 40 45 Pro Lys Leu Leu Val Tyr Lys Val Ser Asn Arg Phe Ser
Gly Val Pro 50 55 60 Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp
Phe Thr Leu Lys Ile 65 70 75 80 Ser Arg Val Glu Ala Glu Asp Leu Gly
Thr Tyr Tyr Cys Phe Gln Gly 85 90 95 Ser Leu Val Pro Trp Ala Phe
Gly Gly Gly Thr Lys Leu Glu Ile Lys 100 105 110 16117PRTArtificial
sequenceSynthetic amino acid sequence 16Glu Val His Leu Val Glu Ser
Gly Gly Ala Leu Val Lys Pro Gly Gly 1 5 10 15 Ser Leu Lys Leu Ser
Cys Ala Ala Ser Gly Phe Ser Phe Ser Lys Tyr 20 25 30 Gly Met Ser
Trp Val Arg Gln Thr Pro Asp Lys Arg Leu Glu Trp Val 35 40 45 Ala
Thr Ile Ser Ser Ser Gly Ser Arg Thr Tyr Tyr Pro Asp Ser Val 50 55
60 Lys Gly Gln Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn Thr Leu Tyr
65 70 75 80 Leu Gln Met Ser Ser Leu Lys Ser Glu Asp Thr Ala Met Tyr
Tyr Cys 85 90 95 Ser Ile Ser Trp Asp Gly Ala Met Asp Tyr Trp Gly
Gln Gly Thr Ser 100 105 110 Val Thr Val Ser Ser 115
17336DNAArtificial sequenceSynthetic nucleic acid sequence
17gatgttttga tgacccaaac tccgctctcc ctggcagtca atcttggaga tcaagcctcc
60ctctcttgca gatcgagtca gactatttta catagtaatg gaaataccta tttagaatgg
120tatttgcaga aaccaggcca gtctccaaga ctcctgatct acaaagtttc
taaacgattt 180tctggggtcc cagacaggtt cagtggcagt ggatcaggga
cagatttcac actcaagatc 240agcagagtgg aggctgacga tctgggaatt
tattactgct ttcaaggttc acttgttcct 300tgggcgttcg gtggaggcac
caagctggaa atcaaa 33618351DNAArtificial sequenceSynthetic nucleic
acid sequence 18gaggtgcagt tggtggagtc tggggaagac ttagtgaagc
ctggagggtc cctgaaactc 60tcctgtgtcg cttctggatt cgctttcagt agctatggca
tgtcttgggt tcgccagact 120ccagacatga ggctggagtg ggtcgcaaca
attagtagca gtggtagtcg cacctacttt 180ccagacagtg tgaaggggcg
actcaccatc tccagagaca atgacaagaa catcctatac 240ctacaaatga
gcagtctgag gtctgaggac acagccatgt actattgtac gattacctgg
300gacggtgcta tggactactg gggtcgtgga atatcagtca ccgtctcctc a
35119336DNAArtificial sequenceSynthetic nucleic acid sequence
19gatgttttga tgacccaaac tccactctcc ctgcctgtca gtcttggaga tcaagcctcc
60atctcttgca aatctagtca gagcattgta catagtaatg gaaacaccta tttagaatgg
120tacctgcaga aaccaggcca gtctccaaag ctcctggtct acaaagtttc
caatcgattt 180tctggggtcc cagacaggtt cagtggcagt ggatcaggga
cagatttcac actcaagatc 240agcagagtgg aggctgagga tctgggaact
tattactgct ttcaaggttc acttgttcct 300tgggcgttcg gtggaggcac
caagctggaa atcaaa 33620351DNAArtificial sequenceSynthetic nucleic
acid sequence 20gaggttcatc tggtggagtc tgggggagcc ttagtgaagc
ctggagggtc cctgaaactc 60tcctgtgcag cctctggatt cagtttcagt aaatatggca
tgtcttgggt tcgccagact 120ccagacaaga ggctggagtg ggtcgcaacc
attagtagta gtgggagtcg cacctactat 180ccagacagtg tgaagggcca
attcaccatc tccagagaca atgccaagaa caccctgtac 240ctgcaaatga
gcagtctgaa gtctgaggac acagccatgt attactgttc aattagctgg
300gacggtgcta tggactactg gggtcaaggg acctcagtca ccgtctcctc a
35121441PRTArtificial sequenceSynthetic amino acid sequence 21Met
Ala Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala Gly 1 5 10
15 Thr Tyr Gly Leu Gly Asp Arg Lys Asp Gln Gly Gly Tyr Thr Met His
20 25 30 Gln Asp Gln Glu Gly Asp Thr Asp Ala Gly Leu Lys Glu Ser
Pro Leu 35 40 45 Gln Thr Pro Thr Glu Asp Gly Ser Glu Glu Pro Gly
Ser Glu Thr Ser 50 55 60 Asp Ala Lys Ser Thr Pro Thr Ala Glu Asp
Val Thr Ala Pro Leu Val 65 70 75 80 Asp Glu Gly Ala Pro Gly Lys Gln
Ala Ala Ala Gln Pro His Thr Glu 85 90 95 Ile Pro Glu Gly Thr Thr
Ala Glu Glu Ala Gly Ile Gly Asp Thr Pro 100 105 110 Ser Leu Glu Asp
Glu Ala Ala Gly His Val Thr Gln Ala Arg Met Val 115 120 125 Ser Lys
Ser Lys Asp Gly Thr Gly Ser Asp Asp Lys Lys Ala Lys Gly 130 135 140
Ala Asp Gly Lys Thr Lys Ile Ala Thr Pro Arg Gly Ala Ala Pro Pro 145
150 155 160 Gly Gln Lys Gly Gln Ala Asn Ala Thr Arg Ile Pro Ala Lys
Thr Pro 165 170 175 Pro Ala Pro Lys Thr Pro Pro Ser Ser Gly Glu Pro
Pro Lys Ser Gly 180 185 190 Asp Arg Ser Gly Tyr Ser Ser Pro Gly Ser
Pro Gly Thr Pro Gly Ser 195 200 205 Arg Ser Arg Thr Pro Ser Leu Pro
Thr Pro Pro Thr Arg Glu Pro Lys 210 215 220 Lys Val Ala Val Val Arg
Thr Pro Pro Lys Ser Pro Ser Ser Ala Lys 225 230 235 240 Ser Arg Leu
Gln Thr Ala Pro Val Pro Met Pro Asp Leu Lys Asn Val 245 250 255 Lys
Ser Lys Ile Gly Ser Thr Glu Asn Leu Lys His Gln Pro Gly Gly 260 265
270 Gly Lys Val Gln Ile Ile Asn Lys Lys Leu Asp Leu Ser Asn Val Gln
275 280 285 Ser Lys Cys Gly Ser Lys Asp Asn Ile Lys His Val Pro Gly
Gly Gly 290 295 300 Ser Val Gln Ile Val Tyr Lys Pro Val Asp Leu Ser
Lys Val Thr Ser 305 310 315 320 Lys Cys Gly Ser Leu Gly Asn Ile His
His Lys Pro Gly Gly Gly Gln 325 330 335 Val Glu Val Lys Ser Glu Lys
Leu Asp Phe Lys Asp Arg Val Gln Ser 340 345 350 Lys Ile Gly Ser Leu
Asp Asn Ile Thr His Val Pro Gly Gly Gly Asn 355 360 365 Lys Lys Ile
Glu Thr His Lys Leu Thr Phe Arg Glu Asn Ala Lys Ala 370 375 380 Lys
Thr Asp His Gly Ala Glu Ile Val Tyr Lys Ser Pro Val Val Ser 385 390
395 400 Gly Asp Thr Ser Pro Arg His Leu Ser Asn Val Ser Ser Thr Gly
Ser 405 410 415 Ile Asp Met Val Asp Ser Pro Gln Leu Ala Thr Leu Ala
Asp Glu Val 420 425 430 Ser Ala Ser Leu Ala Lys Gln Gly Leu 435 440
22383PRTArtificial sequenceSynthetic amino acid sequence 22Met Ala
Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala Gly 1 5 10 15
Thr Tyr Gly Leu Gly Asp Arg Lys Asp Gln Gly Gly Tyr Thr Met His 20
25 30 Gln Asp Gln Glu Gly Asp Thr Asp Ala Gly Leu Lys Ala Glu Glu
Ala 35 40 45 Gly Ile Gly Asp Thr Pro Ser Leu Glu Asp Glu Ala Ala
Gly His Val 50 55 60 Thr Gln Ala Arg Met Val Ser Lys Ser Lys Asp
Gly Thr Gly Ser Asp 65 70 75 80 Asp Lys Lys Ala Lys Gly Ala Asp Gly
Lys Thr Lys Ile Ala Thr Pro 85 90 95 Arg Gly Ala Ala Pro Pro Gly
Gln Lys Gly Gln Ala Asn Ala Thr Arg 100 105 110 Ile Pro Ala Lys Thr
Pro Pro Ala Pro Lys Thr Pro Pro Ser Ser Gly 115 120 125 Glu Pro Pro
Lys Ser Gly Asp Arg Ser Gly Tyr Ser Ser Pro Gly Ser 130 135 140 Pro
Gly Thr Pro Gly Ser Arg Ser Arg Thr Pro Ser Leu Pro Thr Pro 145 150
155 160 Pro Thr Arg Glu Pro Lys Lys Val Ala Val Val Arg Thr Pro Pro
Lys 165 170 175 Ser Pro Ser Ser Ala Lys Ser Arg Leu Gln Thr Ala Pro
Val Pro Met 180 185 190 Pro Asp Leu Lys Asn Val Lys Ser Lys Ile Gly
Ser Thr Glu Asn Leu 195 200 205 Lys His Gln Pro Gly Gly Gly Lys Val
Gln Ile Ile Asn Lys Lys Leu 210 215 220 Asp Leu Ser Asn Val Gln Ser
Lys Cys Gly Ser Lys Asp Asn Ile Lys 225 230 235 240 His Val Pro Gly
Gly Gly Ser Val Gln Ile Val Tyr Lys Pro Val Asp 245 250 255 Leu Ser
Lys Val Thr Ser Lys Cys Gly Ser Leu Gly Asn Ile His His 260 265 270
Lys Pro Gly Gly Gly Gln Val Glu Val Lys Ser Glu Lys Leu Asp Phe 275
280 285 Lys Asp Arg Val Gln Ser Lys Ile Gly Ser Leu Asp Asn Ile Thr
His 290 295 300 Val Pro Gly Gly Gly Asn Lys Lys Ile Glu Thr His Lys
Leu Thr Phe 305 310 315 320 Arg Glu Asn Ala Lys Ala Lys Thr Asp His
Gly Ala Glu Ile Val Tyr 325 330 335 Lys Ser Pro Val Val Ser Gly Asp
Thr Ser Pro Arg His Leu Ser Asn 340 345 350 Val Ser Ser Thr Gly Ser
Ile Asp Met Val Asp Ser Pro Gln Leu Ala 355 360 365 Thr Leu Ala Asp
Glu Val Ser Ala Ser Leu Ala Lys Gln Gly Leu 370 375 380
23352PRTArtificial sequenceSynthetic amino acid sequence 23Met Ala
Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala Gly 1 5 10 15
Thr Tyr Gly Leu Gly Asp Arg Lys Asp Gln Gly Gly Tyr Thr Met His 20
25 30 Gln Asp Gln Glu Gly Asp Thr Asp Ala Gly Leu Lys Ala Glu Glu
Ala 35 40 45 Gly Ile Gly Asp Thr Pro Ser Leu Glu Asp Glu Ala Ala
Gly His Val 50 55 60 Thr Gln Ala Arg Met Val Ser Lys Ser Lys Asp
Gly Thr Gly Ser Asp 65 70 75 80 Asp Lys Lys Ala Lys Gly Ala Asp Gly
Lys Thr Lys Ile Ala Thr Pro 85 90 95 Arg Gly Ala Ala Pro Pro Gly
Gln Lys Gly Gln Ala Asn Ala Thr Arg 100 105 110 Ile Pro Ala Lys Thr
Pro Pro Ala Pro Lys Thr Pro Pro Ser Ser Gly 115 120 125 Glu Pro Pro
Lys Ser Gly Asp Arg Ser Gly Tyr Ser Ser Pro Gly Ser 130 135 140 Pro
Gly Thr Pro Gly Ser Arg Ser Arg Thr Pro Ser Leu Pro Thr Pro 145 150
155 160 Pro Thr Arg Glu Pro Lys Lys Val Ala Val Val Arg Thr Pro Pro
Lys 165 170 175 Ser Pro Ser Ser Ala Lys Ser Arg Leu Gln Thr Ala Pro
Val Pro Met 180 185 190 Pro Asp Leu Lys Asn Val Lys Ser Lys Ile Gly
Ser Thr Glu Asn Leu 195 200 205 Lys His Gln Pro Gly Gly Gly Lys Val
Gln Ile Val Tyr Lys Pro Val 210 215 220 Asp Leu Ser Lys Val Thr Ser
Lys Cys Gly Ser Leu Gly Asn Ile His 225 230 235 240 His Lys Pro Gly
Gly Gly Gln Val Glu Val Lys Ser Glu Lys Leu Asp 245 250 255 Phe Lys
Asp Arg Val Gln Ser Lys Ile Gly Ser Leu Asp Asn Ile Thr 260 265 270
His Val Pro Gly Gly Gly Asn Lys Lys Ile Glu Thr His Lys Leu Thr 275
280 285 Phe Arg Glu Asn Ala Lys Ala Lys Thr Asp His Gly Ala Glu Ile
Val 290 295 300 Tyr Lys Ser Pro Val Val Ser Gly Asp Thr Ser Pro Arg
His Leu Ser 305 310 315 320 Asn Val Ser Ser Thr Gly Ser Ile Asp Met
Val Asp Ser Pro Gln Leu 325 330 335 Ala Thr Leu Ala Asp Glu Val Ser
Ala Ser Leu Ala Lys Gln Gly Leu 340 345 350 24412PRTArtificial
sequenceSynthetic amino acid sequence 24Met Ala Glu Pro Arg Gln Glu
Phe Glu Val Met Glu Asp His Ala Gly 1 5 10 15 Thr Tyr Gly Leu Gly
Asp Arg Lys Asp Gln Gly Gly Tyr Thr Met His 20 25 30 Gln Asp Gln
Glu Gly Asp Thr Asp Ala Gly Leu Lys Glu Ser Pro Leu 35 40 45 Gln
Thr Pro Thr Glu Asp Gly Ser Glu Glu Pro Gly Ser Glu Thr Ser 50 55
60 Asp Ala Lys Ser Thr Pro Thr Ala Glu Ala Glu Glu Ala Gly Ile Gly
65 70 75 80 Asp Thr Pro Ser Leu Glu Asp Glu Ala Ala Gly His Val Thr
Gln Ala 85 90 95 Arg Met Val Ser Lys Ser Lys Asp Gly Thr Gly Ser
Asp Asp Lys Lys 100 105 110 Ala Lys Gly Ala Asp Gly Lys Thr Lys Ile
Ala Thr Pro Arg Gly Ala 115 120 125 Ala Pro Pro Gly Gln Lys Gly
Gln
Ala Asn Ala Thr Arg Ile Pro Ala 130 135 140 Lys Thr Pro Pro Ala Pro
Lys Thr Pro Pro Ser Ser Gly Glu Pro Pro 145 150 155 160 Lys Ser Gly
Asp Arg Ser Gly Tyr Ser Ser Pro Gly Ser Pro Gly Thr 165 170 175 Pro
Gly Ser Arg Ser Arg Thr Pro Ser Leu Pro Thr Pro Pro Thr Arg 180 185
190 Glu Pro Lys Lys Val Ala Val Val Arg Thr Pro Pro Lys Ser Pro Ser
195 200 205 Ser Ala Lys Ser Arg Leu Gln Thr Ala Pro Val Pro Met Pro
Asp Leu 210 215 220 Lys Asn Val Lys Ser Lys Ile Gly Ser Thr Glu Asn
Leu Lys His Gln 225 230 235 240 Pro Gly Gly Gly Lys Val Gln Ile Ile
Asn Lys Lys Leu Asp Leu Ser 245 250 255 Asn Val Gln Ser Lys Cys Gly
Ser Lys Asp Asn Ile Lys His Val Pro 260 265 270 Gly Gly Gly Ser Val
Gln Ile Val Tyr Lys Pro Val Asp Leu Ser Lys 275 280 285 Val Thr Ser
Lys Cys Gly Ser Leu Gly Asn Ile His His Lys Pro Gly 290 295 300 Gly
Gly Gln Val Glu Val Lys Ser Glu Lys Leu Asp Phe Lys Asp Arg 305 310
315 320 Val Gln Ser Lys Ile Gly Ser Leu Asp Asn Ile Thr His Val Pro
Gly 325 330 335 Gly Gly Asn Lys Lys Ile Glu Thr His Lys Leu Thr Phe
Arg Glu Asn 340 345 350 Ala Lys Ala Lys Thr Asp His Gly Ala Glu Ile
Val Tyr Lys Ser Pro 355 360 365 Val Val Ser Gly Asp Thr Ser Pro Arg
His Leu Ser Asn Val Ser Ser 370 375 380 Thr Gly Ser Ile Asp Met Val
Asp Ser Pro Gln Leu Ala Thr Leu Ala 385 390 395 400 Asp Glu Val Ser
Ala Ser Leu Ala Lys Gln Gly Leu 405 410 25776PRTArtificial
sequenceSynthetic amino acid sequence 25Met Ala Glu Pro Arg Gln Glu
Phe Glu Val Met Glu Asp His Ala Gly 1 5 10 15 Thr Tyr Gly Leu Gly
Asp Arg Lys Asp Gln Gly Gly Tyr Thr Met His 20 25 30 Gln Asp Gln
Glu Gly Asp Thr Asp Ala Gly Leu Lys Glu Ser Pro Leu 35 40 45 Gln
Thr Pro Thr Glu Asp Gly Ser Glu Glu Pro Gly Ser Glu Thr Ser 50 55
60 Asp Ala Lys Ser Thr Pro Thr Ala Glu Asp Val Thr Ala Pro Leu Val
65 70 75 80 Asp Glu Gly Ala Pro Gly Lys Gln Ala Ala Ala Gln Pro His
Thr Glu 85 90 95 Ile Pro Glu Gly Thr Thr Ala Glu Glu Ala Gly Ile
Gly Asp Thr Pro 100 105 110 Ser Leu Glu Asp Glu Ala Ala Gly His Val
Thr Gln Glu Pro Glu Ser 115 120 125 Gly Lys Val Val Gln Glu Gly Phe
Leu Arg Glu Pro Gly Pro Pro Gly 130 135 140 Leu Ser His Gln Leu Met
Ser Gly Met Pro Gly Ala Pro Leu Leu Pro 145 150 155 160 Glu Gly Pro
Arg Glu Ala Thr Arg Gln Pro Ser Gly Thr Gly Pro Glu 165 170 175 Asp
Thr Glu Gly Gly Arg His Ala Pro Glu Leu Leu Lys His Gln Leu 180 185
190 Leu Gly Asp Leu His Gln Glu Gly Pro Pro Leu Lys Gly Ala Gly Gly
195 200 205 Lys Glu Arg Pro Gly Ser Lys Glu Glu Val Asp Glu Asp Arg
Asp Val 210 215 220 Asp Glu Ser Ser Pro Gln Asp Ser Pro Pro Ser Lys
Ala Ser Pro Ala 225 230 235 240 Gln Asp Gly Arg Pro Pro Gln Thr Ala
Ala Arg Glu Ala Thr Ser Ile 245 250 255 Pro Gly Phe Pro Ala Glu Gly
Ala Ile Pro Leu Pro Val Asp Phe Leu 260 265 270 Ser Lys Val Ser Thr
Glu Ile Pro Ala Ser Glu Pro Asp Gly Pro Ser 275 280 285 Val Gly Arg
Ala Lys Gly Gln Asp Ala Pro Leu Glu Phe Thr Phe His 290 295 300 Val
Glu Ile Thr Pro Asn Val Gln Lys Glu Gln Ala His Ser Glu Glu 305 310
315 320 His Leu Gly Arg Ala Ala Phe Pro Gly Ala Pro Gly Glu Gly Pro
Glu 325 330 335 Ala Arg Gly Pro Ser Leu Gly Glu Asp Thr Lys Glu Ala
Asp Leu Pro 340 345 350 Glu Pro Ser Glu Lys Gln Pro Ala Ala Ala Pro
Arg Gly Lys Pro Val 355 360 365 Ser Arg Val Pro Gln Leu Lys Ala Arg
Met Val Ser Lys Ser Lys Asp 370 375 380 Gly Thr Gly Ser Asp Asp Lys
Lys Ala Lys Thr Ser Thr Arg Ser Ser 385 390 395 400 Ala Lys Thr Leu
Lys Asn Arg Pro Cys Leu Ser Pro Lys His Pro Thr 405 410 415 Pro Gly
Ser Ser Asp Pro Leu Ile Gln Pro Ser Ser Pro Ala Val Cys 420 425 430
Pro Glu Pro Pro Ser Ser Pro Lys His Val Ser Ser Val Thr Ser Arg 435
440 445 Thr Gly Ser Ser Gly Ala Lys Glu Met Lys Leu Lys Gly Ala Asp
Gly 450 455 460 Lys Thr Lys Ile Ala Thr Pro Arg Gly Ala Ala Pro Pro
Gly Gln Lys 465 470 475 480 Gly Gln Ala Asn Ala Thr Arg Ile Pro Ala
Lys Thr Pro Pro Ala Pro 485 490 495 Lys Thr Pro Pro Ser Ser Ala Thr
Lys Gln Val Gln Arg Arg Pro Pro 500 505 510 Pro Ala Gly Pro Arg Ser
Glu Arg Gly Glu Pro Pro Lys Ser Gly Asp 515 520 525 Arg Ser Gly Tyr
Ser Ser Pro Gly Ser Pro Gly Thr Pro Gly Ser Arg 530 535 540 Ser Arg
Thr Pro Ser Leu Pro Thr Pro Pro Thr Arg Glu Pro Lys Lys 545 550 555
560 Val Ala Val Val Arg Thr Pro Pro Lys Ser Pro Ser Ser Ala Lys Ser
565 570 575 Arg Leu Gln Thr Ala Pro Val Pro Met Pro Asp Leu Lys Asn
Val Lys 580 585 590 Ser Lys Ile Gly Ser Thr Glu Asn Leu Lys His Gln
Pro Gly Gly Gly 595 600 605 Lys Val Gln Ile Ile Asn Lys Lys Leu Asp
Leu Ser Asn Val Gln Ser 610 615 620 Lys Cys Gly Ser Lys Asp Asn Ile
Lys His Val Pro Gly Gly Gly Ser 625 630 635 640 Val Gln Ile Val Tyr
Lys Pro Val Asp Leu Ser Lys Val Thr Ser Lys 645 650 655 Cys Gly Ser
Leu Gly Asn Ile His His Lys Pro Gly Gly Gly Gln Val 660 665 670 Glu
Val Lys Ser Glu Lys Leu Asp Phe Lys Asp Arg Val Gln Ser Lys 675 680
685 Ile Gly Ser Leu Asp Asn Ile Thr His Val Pro Gly Gly Gly Asn Lys
690 695 700 Lys Ile Glu Thr His Lys Leu Thr Phe Arg Glu Asn Ala Lys
Ala Lys 705 710 715 720 Thr Asp His Gly Ala Glu Ile Val Tyr Lys Ser
Pro Val Val Ser Gly 725 730 735 Asp Thr Ser Pro Arg His Leu Ser Asn
Val Ser Ser Thr Gly Ser Ile 740 745 750 Asp Met Val Asp Ser Pro Gln
Leu Ala Thr Leu Ala Asp Glu Val Ser 755 760 765 Ala Ser Leu Ala Lys
Gln Gly Leu 770 775 26758PRTArtificial sequenceSynthetic amino acid
sequence 26Met Ala Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His
Ala Gly 1 5 10 15 Thr Tyr Gly Leu Gly Asp Arg Lys Asp Gln Gly Gly
Tyr Thr Met His 20 25 30 Gln Asp Gln Glu Gly Asp Thr Asp Ala Gly
Leu Lys Glu Ser Pro Leu 35 40 45 Gln Thr Pro Thr Glu Asp Gly Ser
Glu Glu Pro Gly Ser Glu Thr Ser 50 55 60 Asp Ala Lys Ser Thr Pro
Thr Ala Glu Asp Val Thr Ala Pro Leu Val 65 70 75 80 Asp Glu Gly Ala
Pro Gly Lys Gln Ala Ala Ala Gln Pro His Thr Glu 85 90 95 Ile Pro
Glu Gly Thr Thr Ala Glu Glu Ala Gly Ile Gly Asp Thr Pro 100 105 110
Ser Leu Glu Asp Glu Ala Ala Gly His Val Thr Gln Glu Pro Glu Ser 115
120 125 Gly Lys Val Val Gln Glu Gly Phe Leu Arg Glu Pro Gly Pro Pro
Gly 130 135 140 Leu Ser His Gln Leu Met Ser Gly Met Pro Gly Ala Pro
Leu Leu Pro 145 150 155 160 Glu Gly Pro Arg Glu Ala Thr Arg Gln Pro
Ser Gly Thr Gly Pro Glu 165 170 175 Asp Thr Glu Gly Gly Arg His Ala
Pro Glu Leu Leu Lys His Gln Leu 180 185 190 Leu Gly Asp Leu His Gln
Glu Gly Pro Pro Leu Lys Gly Ala Gly Gly 195 200 205 Lys Glu Arg Pro
Gly Ser Lys Glu Glu Val Asp Glu Asp Arg Asp Val 210 215 220 Asp Glu
Ser Ser Pro Gln Asp Ser Pro Pro Ser Lys Ala Ser Pro Ala 225 230 235
240 Gln Asp Gly Arg Pro Pro Gln Thr Ala Ala Arg Glu Ala Thr Ser Ile
245 250 255 Pro Gly Phe Pro Ala Glu Gly Ala Ile Pro Leu Pro Val Asp
Phe Leu 260 265 270 Ser Lys Val Ser Thr Glu Ile Pro Ala Ser Glu Pro
Asp Gly Pro Ser 275 280 285 Val Gly Arg Ala Lys Gly Gln Asp Ala Pro
Leu Glu Phe Thr Phe His 290 295 300 Val Glu Ile Thr Pro Asn Val Gln
Lys Glu Gln Ala His Ser Glu Glu 305 310 315 320 His Leu Gly Arg Ala
Ala Phe Pro Gly Ala Pro Gly Glu Gly Pro Glu 325 330 335 Ala Arg Gly
Pro Ser Leu Gly Glu Asp Thr Lys Glu Ala Asp Leu Pro 340 345 350 Glu
Pro Ser Glu Lys Gln Pro Ala Ala Ala Pro Arg Gly Lys Pro Val 355 360
365 Ser Arg Val Pro Gln Leu Lys Ala Arg Met Val Ser Lys Ser Lys Asp
370 375 380 Gly Thr Gly Ser Asp Asp Lys Lys Ala Lys Thr Ser Thr Arg
Ser Ser 385 390 395 400 Ala Lys Thr Leu Lys Asn Arg Pro Cys Leu Ser
Pro Lys His Pro Thr 405 410 415 Pro Gly Ser Ser Asp Pro Leu Ile Gln
Pro Ser Ser Pro Ala Val Cys 420 425 430 Pro Glu Pro Pro Ser Ser Pro
Lys His Val Ser Ser Val Thr Ser Arg 435 440 445 Thr Gly Ser Ser Gly
Ala Lys Glu Met Lys Leu Lys Gly Ala Asp Gly 450 455 460 Lys Thr Lys
Ile Ala Thr Pro Arg Gly Ala Ala Pro Pro Gly Gln Lys 465 470 475 480
Gly Gln Ala Asn Ala Thr Arg Ile Pro Ala Lys Thr Pro Pro Ala Pro 485
490 495 Lys Thr Pro Pro Ser Ser Gly Glu Pro Pro Lys Ser Gly Asp Arg
Ser 500 505 510 Gly Tyr Ser Ser Pro Gly Ser Pro Gly Thr Pro Gly Ser
Arg Ser Arg 515 520 525 Thr Pro Ser Leu Pro Thr Pro Pro Thr Arg Glu
Pro Lys Lys Val Ala 530 535 540 Val Val Arg Thr Pro Pro Lys Ser Pro
Ser Ser Ala Lys Ser Arg Leu 545 550 555 560 Gln Thr Ala Pro Val Pro
Met Pro Asp Leu Lys Asn Val Lys Ser Lys 565 570 575 Ile Gly Ser Thr
Glu Asn Leu Lys His Gln Pro Gly Gly Gly Lys Val 580 585 590 Gln Ile
Ile Asn Lys Lys Leu Asp Leu Ser Asn Val Gln Ser Lys Cys 595 600 605
Gly Ser Lys Asp Asn Ile Lys His Val Pro Gly Gly Gly Ser Val Gln 610
615 620 Ile Val Tyr Lys Pro Val Asp Leu Ser Lys Val Thr Ser Lys Cys
Gly 625 630 635 640 Ser Leu Gly Asn Ile His His Lys Pro Gly Gly Gly
Gln Val Glu Val 645 650 655 Lys Ser Glu Lys Leu Asp Phe Lys Asp Arg
Val Gln Ser Lys Ile Gly 660 665 670 Ser Leu Asp Asn Ile Thr His Val
Pro Gly Gly Gly Asn Lys Lys Ile 675 680 685 Glu Thr His Lys Leu Thr
Phe Arg Glu Asn Ala Lys Ala Lys Thr Asp 690 695 700 His Gly Ala Glu
Ile Val Tyr Lys Ser Pro Val Val Ser Gly Asp Thr 705 710 715 720 Ser
Pro Arg His Leu Ser Asn Val Ser Ser Thr Gly Ser Ile Asp Met 725 730
735 Val Asp Ser Pro Gln Leu Ala Thr Leu Ala Asp Glu Val Ser Ala Ser
740 745 750 Leu Ala Lys Gln Gly Leu 755 27352PRTArtificial
sequenceSynthetic amino acid sequence 27Met Ala Glu Pro Arg Gln Glu
Phe Glu Val Met Glu Asp His Ala Gly 1 5 10 15 Thr Tyr Gly Leu Gly
Asp Arg Lys Asp Gln Gly Gly Tyr Thr Met His 20 25 30 Gln Asp Gln
Glu Gly Asp Thr Asp Ala Gly Leu Lys Ala Glu Glu Ala 35 40 45 Gly
Ile Gly Asp Thr Pro Ser Leu Glu Asp Glu Ala Ala Gly His Val 50 55
60 Thr Gln Ala Arg Met Val Ser Lys Ser Lys Asp Gly Thr Gly Ser Asp
65 70 75 80 Asp Lys Lys Ala Lys Gly Ala Asp Gly Lys Thr Lys Ile Ala
Thr Pro 85 90 95 Arg Gly Ala Ala Pro Pro Gly Gln Lys Gly Gln Ala
Asn Ala Thr Arg 100 105 110 Ile Pro Ala Lys Thr Pro Pro Ala Pro Lys
Thr Pro Pro Ser Ser Gly 115 120 125 Glu Pro Pro Lys Ser Gly Asp Arg
Ser Gly Tyr Ser Ser Pro Gly Ser 130 135 140 Pro Gly Thr Pro Gly Ser
Arg Ser Arg Thr Pro Ser Leu Pro Thr Pro 145 150 155 160 Pro Thr Arg
Glu Pro Lys Lys Val Ala Val Val Arg Thr Pro Pro Lys 165 170 175 Ser
Pro Ser Ser Ala Lys Ser Arg Leu Gln Thr Ala Pro Val Pro Met 180 185
190 Pro Asp Leu Lys Asn Val Lys Ser Lys Ile Gly Ser Thr Glu Asn Leu
195 200 205 Lys His Gln Pro Gly Gly Gly Lys Val Gln Ile Val Tyr Lys
Pro Val 210 215 220 Asp Leu Ser Lys Val Thr Ser Lys Cys Gly Ser Leu
Gly Asn Ile His 225 230 235 240 His Lys Pro Gly Gly Gly Gln Val Glu
Val Lys Ser Glu Lys Leu Asp 245 250 255 Phe Lys Asp Arg Val Gln Ser
Lys Ile Gly Ser Leu Asp Asn Ile Thr 260 265 270 His Val Pro Gly Gly
Gly Asn Lys Lys Ile Glu Thr His Lys Leu Thr 275 280 285 Phe Arg Glu
Asn Ala Lys Ala Lys Thr Asp His Gly Ala Glu Ile Val 290 295 300 Tyr
Lys Ser Pro Val Val Ser Gly Asp Thr Ser Pro Arg His Leu Ser 305 310
315 320 Asn Val Ser Ser Thr Gly Ser Ile Asp Met Val Asp Ser Pro Gln
Leu 325 330 335 Ala Thr Leu Ala Asp Glu Val Ser Ala Ser Leu Ala Lys
Gln Gly Leu 340 345 350 28351DNAArtificial sequenceSynthetic
nucleic acid sequence 28gaggttcatc tggtggagtc tgggggagcc ttagtgaagc
ctggagggtc cctgagactc 60tcctgtgcag cctctggatt cagtttcagt aaatatggca
tgtcttgggt tcgccaggcc 120ccaggcaagg gcctggagtg ggtcgcaacc
attagtagta gtgggagtcg cacctactat 180ccagacagtg tgaagggcag
attcaccatc tccagagaca atgccaagaa caccctgtac 240ctgcaaatga
gcagtctgaa gtctgaggac acagccatgt attactgttc aattagctgg
300gacggtgcta tggactactg gggtcaaggg acctcagtca ccgtctcctc a
35129351DNAArtificial sequenceSynthetic nucleic acid sequence
29gaggttcatc tggtggagtc tgggggagcc ttagtgaagc ctggagggtc cctgagactc
60tcctgtgcag cctctggatt cagtttcagt aaatatggca tgtcttgggt tcgccaggcc
120ccaggcaagg gcctggagtg ggtcgcaacc attagtagta gtgggagtcg
cacctactat 180ccagacagtg tgaagggcag attcaccatc tccagagaca
atgccaagaa caccctgtac 240ctgcaaatga acagtctgag agccgaggac
acagccatgt attactgttc aattagctgg
300gacggtgcta tggactactg gggtcaaggg accaccgtca ccgtctcctc a
35130351DNAArtificial sequenceSynthetic nucleic acid sequence
30gaggttcagc tggtggagtc tgggggagcc ttagtgaagc ctggagggtc cctgagactc
60tcctgtgcag cctctggatt cagtttcagt aaatatggca tgtcttgggt tcgccaggcc
120ccaggcaagg gcctggagtg ggtcgcaacc attagtagta gtgggagtcg
cacctactat 180ccagacagtg tgaagggcag attcaccatc tccagagaca
atgccaagaa caccctgtac 240ctgcaaatga acagtctgag agccgaggac
acagccatgt attactgttc aattagctgg 300gacggtgcta tggactactg
gggtcaaggg accaccgtca ccgtctcctc a 35131351DNAArtificial
sequenceSynthetic nucleic acid sequence 31gaggttcagc tggtggagtc
tgggggagcc ttagtgaagc ctggagggtc cctgagactc 60tcctgtgcag cctctggatt
cagtttcagt aaatatggca tgtcttgggt tcgccaggcc 120ccaggcaagg
gcctggagtg ggtcgcaacc attagtagta gtgggagtcg cacctactat
180ccagacagtg tgaagggcag attcaccatc tccagagaca atgccaagaa
caccctgtac 240ctgcaaatga acagtctgag agccgaggac acagccatgt
attactgtgc cattagctgg 300gacggtgcta tggactactg gggtcaaggg
accaccgtca ccgtctcctc a 35132336DNAArtificial sequenceSynthetic
nucleic acid sequence 32gatgttttga tgacccaaag cccactctcc ctgcctgtca
cccttggaca gcccgcctcc 60atctcttgca aatctagtca gagcattgta catagtaatg
gaaacaccta tttagaatgg 120tacctgcaga aaccaggcca gtctccacag
ctcctggtct acaaagtttc caatcgattt 180tctggggtcc cagacagatt
cagtggcagt ggatcaggga cagatttcac actcaagatc 240agcagagtgg
aggctgagga tgtgggaact tattactgct ttcaaggctc acttgttcct
300tgggcgttcg gtggaggcac caaggtggaa atcaaa 33633336DNAArtificial
sequenceSynthetic nucleic acid sequence 33gatgttgtga tgacccaaag
cccactctcc ctgcctgtca cccttggaca gcccgcctcc 60atctcttgca aatctagtca
gagcattgta catagtaatg gaaacaccta tttagaatgg 120tacctgcaga
aaccaggcca gtctccacag ctcctggtct acaaagtttc caatcgattt
180tctggggtcc cagacagatt cagtggcagt ggatcaggga cagatttcac
actcaagatc 240agcagagtgg aggctgagga tgtgggaact tattactgct
ttcaaggctc acttgttcct 300tgggcgttcg gtggaggcac caaggtggaa atcaaa
33634336DNAArtificial sequenceSynthetic nucleic acid sequence
34gatgttgtga tgacccaaag cccactctcc ctgcctgtca cccttggaca gcccgcctcc
60atctcttgca aatctagtca gagcattgta catagtaatg gaaacaccta tttagaatgg
120tacctgcaga aaccaggcca gtctccacag ctcctggtct acaaagtttc
caatcgattt 180tctggggtcc cagacagatt cagtggcagt ggatcaggga
cagatttcac actcaagatc 240agcagagtgg aggctgagga tgtgggagtg
tattactgct ttcaaggctc acttgttcct 300tgggcgttcg gtggaggcac
caaggtggaa atcaaa 33635336DNAArtificial sequenceSynthetic nucleic
acid sequence 35gatgttgtga tgacccaaag cccactctcc ctgcctgtca
cccttggaca gcccgcctcc 60atctcttgca aatctagtca gagcattgta catagtaatg
gaaacaccta tttagaatgg 120tacctgcaga aaccaggcca gtctccacag
ctcctgatct acaaagtttc caatcgattt 180tctggggtcc cagacagatt
cagtggcagt ggatcaggga cagatttcac actcaagatc 240agcagagtgg
aggctgagga tgtgggagtg tattactgct ttcaaggctc acttgttcct
300tgggcgttcg gtggaggcac caaggtggaa atcaaa 33636117PRTArtificial
sequenceSynthetic amino acid sequence 36Glu Val His Leu Val Glu Ser
Gly Gly Ala Leu Val Lys Pro Gly Gly 1 5 10 15 Ser Leu Arg Leu Ser
Cys Ala Ala Ser Gly Phe Ser Phe Ser Lys Tyr 20 25 30 Gly Met Ser
Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40 45 Ala
Thr Ile Ser Ser Ser Gly Ser Arg Thr Tyr Tyr Pro Asp Ser Val 50 55
60 Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn Thr Leu Tyr
65 70 75 80 Leu Gln Met Ser Ser Leu Lys Ser Glu Asp Thr Ala Met Tyr
Tyr Cys 85 90 95 Ser Ile Ser Trp Asp Gly Ala Met Asp Tyr Trp Gly
Gln Gly Thr Ser 100 105 110 Val Thr Val Ser Ser 115
37117PRTArtificial sequenceSynthetic amino acid sequence 37Glu Val
His Leu Val Glu Ser Gly Gly Ala Leu Val Lys Pro Gly Gly 1 5 10 15
Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Ser Phe Ser Lys Tyr 20
25 30 Gly Met Ser Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp
Val 35 40 45 Ala Thr Ile Ser Ser Ser Gly Ser Arg Thr Tyr Tyr Pro
Asp Ser Val 50 55 60 Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala
Lys Asn Thr Leu Tyr 65 70 75 80 Leu Gln Met Asn Ser Leu Arg Ala Glu
Asp Thr Ala Met Tyr Tyr Cys 85 90 95 Ser Ile Ser Trp Asp Gly Ala
Met Asp Tyr Trp Gly Gln Gly Thr Thr 100 105 110 Val Thr Val Ser Ser
115 38117PRTArtificial sequenceSynthetic amino acid sequence 38Glu
Val Gln Leu Val Glu Ser Gly Gly Ala Leu Val Lys Pro Gly Gly 1 5 10
15 Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Ser Phe Ser Lys Tyr
20 25 30 Gly Met Ser Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu
Trp Val 35 40 45 Ala Thr Ile Ser Ser Ser Gly Ser Arg Thr Tyr Tyr
Pro Asp Ser Val 50 55 60 Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn
Ala Lys Asn Thr Leu Tyr 65 70 75 80 Leu Gln Met Asn Ser Leu Arg Ala
Glu Asp Thr Ala Met Tyr Tyr Cys 85 90 95 Ser Ile Ser Trp Asp Gly
Ala Met Asp Tyr Trp Gly Gln Gly Thr Thr 100 105 110 Val Thr Val Ser
Ser 115 39117PRTArtificial sequenceSynthetic amino acid sequence
39Glu Val Gln Leu Val Glu Ser Gly Gly Ala Leu Val Lys Pro Gly Gly 1
5 10 15 Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Ser Phe Ser Lys
Tyr 20 25 30 Gly Met Ser Trp Val Arg Gln Ala Pro Gly Lys Gly Leu
Glu Trp Val 35 40 45 Ala Thr Ile Ser Ser Ser Gly Ser Arg Thr Tyr
Tyr Pro Asp Ser Val 50 55 60 Lys Gly Arg Phe Thr Ile Ser Arg Asp
Asn Ala Lys Asn Thr Leu Tyr 65 70 75 80 Leu Gln Met Asn Ser Leu Arg
Ala Glu Asp Thr Ala Met Tyr Tyr Cys 85 90 95 Ala Ile Ser Trp Asp
Gly Ala Met Asp Tyr Trp Gly Gln Gly Thr Thr 100 105 110 Val Thr Val
Ser Ser 115 40112PRTArtificial sequenceSynthetic amino acid
sequence 40Asp Val Leu Met Thr Gln Ser Pro Leu Ser Leu Pro Val Thr
Leu Gly 1 5 10 15 Gln Pro Ala Ser Ile Ser Cys Lys Ser Ser Gln Ser
Ile Val His Ser 20 25 30 Asn Gly Asn Thr Tyr Leu Glu Trp Tyr Leu
Gln Lys Pro Gly Gln Ser 35 40 45 Pro Gln Leu Leu Val Tyr Lys Val
Ser Asn Arg Phe Ser Gly Val Pro 50 55 60 Asp Arg Phe Ser Gly Ser
Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile 65 70 75 80 Ser Arg Val Glu
Ala Glu Asp Val Gly Thr Tyr Tyr Cys Phe Gln Gly 85 90 95 Ser Leu
Val Pro Trp Ala Phe Gly Gly Gly Thr Lys Val Glu Ile Lys 100 105 110
41112PRTArtificial sequenceSynthetic amino acid sequence 41Asp Val
Val Met Thr Gln Ser Pro Leu Ser Leu Pro Val Thr Leu Gly 1 5 10 15
Gln Pro Ala Ser Ile Ser Cys Lys Ser Ser Gln Ser Ile Val His Ser 20
25 30 Asn Gly Asn Thr Tyr Leu Glu Trp Tyr Leu Gln Lys Pro Gly Gln
Ser 35 40 45 Pro Gln Leu Leu Val Tyr Lys Val Ser Asn Arg Phe Ser
Gly Val Pro 50 55 60 Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp
Phe Thr Leu Lys Ile 65 70 75 80 Ser Arg Val Glu Ala Glu Asp Val Gly
Thr Tyr Tyr Cys Phe Gln Gly 85 90 95 Ser Leu Val Pro Trp Ala Phe
Gly Gly Gly Thr Lys Val Glu Ile Lys 100 105 110 42112PRTArtificial
sequenceSynthetic amino acid sequence 42Asp Val Val Met Thr Gln Ser
Pro Leu Ser Leu Pro Val Thr Leu Gly 1 5 10 15 Gln Pro Ala Ser Ile
Ser Cys Lys Ser Ser Gln Ser Ile Val His Ser 20 25 30 Asn Gly Asn
Thr Tyr Leu Glu Trp Tyr Leu Gln Lys Pro Gly Gln Ser 35 40 45 Pro
Gln Leu Leu Val Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro 50 55
60 Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80 Ser Arg Val Glu Ala Glu Asp Val Gly Val Tyr Tyr Cys Phe
Gln Gly 85 90 95 Ser Leu Val Pro Trp Ala Phe Gly Gly Gly Thr Lys
Val Glu Ile Lys 100 105 110 43112PRTArtificial sequenceSynthetic
amino acid sequence 43Asp Val Val Met Thr Gln Ser Pro Leu Ser Leu
Pro Val Thr Leu Gly 1 5 10 15 Gln Pro Ala Ser Ile Ser Cys Lys Ser
Ser Gln Ser Ile Val His Ser 20 25 30 Asn Gly Asn Thr Tyr Leu Glu
Trp Tyr Leu Gln Lys Pro Gly Gln Ser 35 40 45 Pro Gln Leu Leu Ile
Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro 50 55 60 Asp Arg Phe
Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile 65 70 75 80 Ser
Arg Val Glu Ala Glu Asp Val Gly Val Tyr Tyr Cys Phe Gln Gly 85 90
95 Ser Leu Val Pro Trp Ala Phe Gly Gly Gly Thr Lys Val Glu Ile Lys
100 105 110 44171PRTArtificial sequenceSynthetic amino acid
sequence 44Ala Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala
Gly Thr 1 5 10 15 Tyr Gly Leu Gly Asp Arg Lys Asp Gln Gly Gly Tyr
Thr Met His Gln 20 25 30 Asp Gln Glu Gly Asp Thr Asp Ala Gly Leu
Lys Ala Glu Glu Ala Gly 35 40 45 Ile Gly Asp Thr Pro Ser Leu Glu
Asp Glu Ala Ala Gly His Val Thr 50 55 60 Gln Ala Arg Met Val Ser
Lys Ser Lys Asp Gly Thr Gly Ser Asp Asp 65 70 75 80 Lys Lys Ala Lys
Gly Ala Asp Gly Lys Thr Lys Ile Ala Thr Pro Arg 85 90 95 Gly Ala
Ala Pro Pro Gly Gln Lys Gly Gln Ala Asn Ala Thr Arg Ile 100 105 110
Pro Ala Lys Thr Pro Pro Ala Pro Lys Thr Pro Pro Ser Ser Gly Glu 115
120 125 Pro Pro Lys Ser Gly Asp Arg Ser Gly Tyr Ser Ser Pro Gly Ser
Pro 130 135 140 Gly Thr Pro Gly Ser Arg Ser Arg Thr Pro Ser Leu Pro
Thr Pro Pro 145 150 155 160 Thr Arg Glu Pro Lys Lys Val Ala Val Val
Arg 165 170 45175PRTArtificial sequenceSynthetic amino acid
sequence 45Ala Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala
Gly Thr 1 5 10 15 Tyr Gly Leu Gly Asp Arg Lys Asp Gln Gly Gly Tyr
Thr Met His Gln 20 25 30 Asp Gln Glu Gly Asp Thr Asp Ala Gly Leu
Lys Ala Glu Glu Ala Gly 35 40 45 Ile Gly Asp Thr Pro Ser Leu Glu
Asp Glu Ala Ala Gly His Val Thr 50 55 60 Gln Ala Arg Met Val Ser
Lys Ser Lys Asp Gly Thr Gly Ser Asp Asp 65 70 75 80 Lys Lys Ala Lys
Gly Ala Asp Gly Lys Thr Lys Ile Ala Thr Pro Arg 85 90 95 Gly Ala
Ala Pro Pro Gly Gln Lys Gly Gln Ala Asn Ala Thr Arg Ile 100 105 110
Pro Ala Lys Thr Pro Pro Ala Pro Lys Thr Pro Pro Ser Ser Gly Glu 115
120 125 Pro Pro Lys Ser Gly Asp Arg Ser Gly Tyr Ser Ser Pro Gly Ser
Pro 130 135 140 Gly Thr Pro Gly Ser Arg Ser Arg Thr Pro Ser Leu Pro
Thr Pro Pro 145 150 155 160 Thr Arg Glu Pro Lys Lys Val Ala Val Val
Arg Thr Pro Pro Lys 165 170 175 46150PRTArtificial
sequenceSynthetic amino acid sequence 46Ala Glu Pro Arg Gln Glu Phe
Glu Val Met Glu Asp His Ala Gly Thr 1 5 10 15 Tyr Gly Leu Gly Asp
Arg Lys Asp Gln Gly Gly Tyr Thr Met His Gln 20 25 30 Asp Gln Glu
Gly Asp Thr Asp Ala Gly Leu Lys Ala Glu Glu Ala Gly 35 40 45 Ile
Gly Asp Thr Pro Ser Leu Glu Asp Glu Ala Ala Gly His Val Thr 50 55
60 Gln Ala Arg Met Val Ser Lys Ser Lys Asp Gly Thr Gly Ser Asp Asp
65 70 75 80 Lys Lys Ala Lys Gly Ala Asp Gly Lys Thr Lys Ile Ala Thr
Pro Arg 85 90 95 Gly Ala Ala Pro Pro Gly Gln Lys Gly Gln Ala Asn
Ala Thr Arg Ile 100 105 110 Pro Ala Lys Thr Pro Pro Ala Pro Lys Thr
Pro Pro Ser Ser Gly Glu 115 120 125 Pro Pro Lys Ser Gly Asp Arg Ser
Gly Tyr Ser Ser Pro Gly Ser Pro 130 135 140 Gly Thr Pro Gly Ser Arg
145 150 47121PRTArtificial sequenceSynthetic amino acid sequence
47Ala Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala Gly Thr 1
5 10 15 Tyr Gly Leu Gly Asp Arg Lys Asp Gln Gly Gly Tyr Thr Met His
Gln 20 25 30 Asp Gln Glu Gly Asp Thr Asp Ala Gly Leu Lys Ala Glu
Glu Ala Gly 35 40 45 Ile Gly Asp Thr Pro Ser Leu Glu Asp Glu Ala
Ala Gly His Val Thr 50 55 60 Gln Ala Arg Met Val Ser Lys Ser Lys
Asp Gly Thr Gly Ser Asp Asp 65 70 75 80 Lys Lys Ala Lys Gly Ala Asp
Gly Lys Thr Lys Ile Ala Thr Pro Arg 85 90 95 Gly Ala Ala Pro Pro
Gly Gln Lys Gly Gln Ala Asn Ala Thr Arg Ile 100 105 110 Pro Ala Lys
Thr Pro Pro Ala Pro Lys 115 120 4867PRTArtificial sequenceSynthetic
amino acid sequence 48Ala Glu Pro Arg Gln Glu Phe Glu Val Met Glu
Asp His Ala Gly Thr 1 5 10 15 Tyr Gly Leu Gly Asp Arg Lys Asp Gln
Gly Gly Tyr Thr Met His Gln 20 25 30 Asp Gln Glu Gly Asp Thr Asp
Ala Gly Leu Lys Ala Glu Glu Ala Gly 35 40 45 Ile Gly Asp Thr Pro
Ser Leu Glu Asp Glu Ala Ala Gly His Val Thr 50 55 60 Gln Ala Arg 65
4912PRTArtificial sequenceSynthetic amino acid sequence 49Asp His
Ala Gly Thr Tyr Gly Leu Gly Asp Arg Lys 1 5 10 5030PRTArtificial
sequenceSynthetic amino acid sequence 50Ala Gly Thr Tyr Gly Leu Gly
Asp Arg Lys Asp Gln Gly Gly Tyr Thr 1 5 10 15 Met His Gln Asp Gln
Glu Gly Asp Thr Asp Ala Gly Leu Lys 20 25 30 5110PRTArtificial
sequenceSynthetic amino acid sequence 51Ala Gly Thr Tyr Gly Leu Gly
Asp Arg Lys 1 5 10 5210PRTArtificial sequenceSynthetic amino acid
sequence 52Ala Gly Thr Tyr Gly Leu Gly Asp Arg Lys 1 5 10
5318PRTArtificial sequenceSynthetic amino acid sequence 53Met Ala
Glu Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala Gly 1 5 10 15
Thr Tyr 5423PRTArtificial sequenceSynthetic amino acid sequence
54Asp Val Xaa Met Thr Gln Ser Pro Leu Ser Leu Pro Val Thr Leu Gly 1
5 10 15 Gln Pro Ala Ser Ile Ser Cys 20 5515PRTArtificial
sequenceSynthetic amino acid sequence 55Trp Tyr Leu Gln Lys Pro Gly
Gln Ser Pro Gln Leu Leu Xaa Tyr 1 5 10 15 5632PRTArtificial
sequenceSynthetic amino acid sequence 56Gly Val Pro Asp Arg Phe Ser
Gly Ser Gly Ser Gly Thr Asp Phe Thr 1 5 10 15 Leu Lys Ile Ser Arg
Val Glu Ala Glu Asp Val Gly Xaa Tyr Tyr Cys
20 25 30 5710PRTArtificial sequenceSynthetic amino acid sequence
57Phe Gly Gly Gly Thr Lys Val Glu Ile Lys 1 5 10 585PRTArtificial
sequenceSynthetic amino acid sequence 58Gly Ser Gly Gly Ser 1 5
594PRTArtificial sequenceSynthetic amino acid sequence 59Gly Gly
Gly Ser 1 604PRTArtificial sequenceSynthetic amino acid sequence
60Gly Gly Ser Gly 1 615PRTArtificial sequenceSynthetic amino acid
sequence 61Gly Gly Ser Gly Gly 1 5 625PRTArtificial
sequenceSynthetic amino acid sequence 62Gly Ser Gly Ser Gly 1 5
635PRTArtificial sequenceSynthetic amino acid sequence 63Gly Ser
Gly Gly Gly 1 5 645PRTArtificial sequenceSynthetic amino acid
sequence 64Gly Gly Gly Ser Gly 1 5 655PRTArtificial
sequenceSynthetic amino acid sequence 65Gly Ser Ser Ser Gly 1 5
665PRTArtificial sequenceSynthetic amino acid sequence 66His His
His His His 1 5 676PRTArtificial sequenceSynthetic amino acid
sequence 67His His His His His His 1 5 6810PRTArtificial
sequenceSynthetic amino acid sequence 68Glu Gln Lys Leu Ile Ser Glu
Glu Asp Leu 1 5 10 698PRTArtificial sequenceSynthetic amino acid
sequence 69Asp Tyr Lys Asp Asp Asp Asp Lys 1 5 708PRTArtificial
sequenceSynthetic amino acid sequence 70Trp Ser His Pro Gln Phe Glu
Lys 1 5 719PRTArtificial sequenceSynthetic amino acid sequence
71Tyr Pro Tyr Asp Val Pro Asp Tyr Ala 1 5 725PRTArtificial
sequenceSynthetic amino acid sequence 72Arg Tyr Ile Arg Ser 1 5
734PRTArtificial sequenceSynthetic amino acid sequence 73Phe His
His Thr 1 7417PRTArtificial sequenceSynthetic amino acid sequence
74Trp Glu Ala Ala Ala Arg Glu Ala Cys Cys Arg Glu Cys Cys Ala Arg 1
5 10 15 Ala 7519PRTArtificial sequenceSynthetic amino acid sequence
75Thr Phe Phe Tyr Gly Gly Cys Arg Gly Lys Arg Asn Asn Phe Lys Thr 1
5 10 15 Glu Glu Tyr 7619PRTArtificial sequenceSynthetic amino acid
sequence 76Thr Phe Phe Tyr Gly Gly Ser Arg Gly Lys Arg Asn Asn Phe
Lys Thr 1 5 10 15 Glu Glu Tyr 7720PRTArtificial sequenceSynthetic
amino acid sequence 77Cys Thr Phe Phe Tyr Gly Gly Ser Arg Gly Lys
Arg Asn Asn Phe Lys 1 5 10 15 Thr Glu Glu Tyr 20 7820PRTArtificial
sequenceSynthetic amino acid sequence 78Thr Phe Phe Tyr Gly Gly Ser
Arg Gly Lys Arg Asn Asn Phe Lys Thr 1 5 10 15 Glu Glu Tyr Cys 20
7916PRTArtificial sequenceSynthetic amino acid sequence 79Thr Phe
Val Tyr Gly Gly Cys Arg Ala Lys Arg Asn Asn Phe Lys Ser 1 5 10 15
8017PRTArtificial sequenceSynthetic amino acid sequence 80Ala Glu
Pro Arg Gln Glu Phe Glu Val Met Glu Asp His Ala Gly Thr 1 5 10 15
Tyr 8116PRTArtificial sequenceSynthetic amino acid sequence 81Glu
Val Met Glu Asp His Ala Gly Thr Tyr Gly Leu Gly Asp Arg Lys 1 5 10
15 828PRTArtificial sequenceSynthetic amino acid sequence 82Ala Gly
Thr Tyr Gly Leu Gly Asp 1 5 8330PRTArtificial sequenceSynthetic
amino acid sequence 83Glu Val Xaa Leu Val Glu Ser Gly Gly Ala Leu
Val Lys Pro Gly Gly 1 5 10 15 Ser Leu Arg Leu Ser Cys Ala Ala Ser
Gly Phe Ser Phe Ser 20 25 30 8414PRTArtificial sequenceSynthetic
amino acid sequence 84Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu
Trp Val Ala 1 5 10 8532PRTArtificial sequenceSynthetic amino acid
sequence 85Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn Thr Leu Tyr
Leu Gln 1 5 10 15 Met Xaa Ser Xaa Xaa Xaa Glu Asp Thr Ala Met Tyr
Tyr Cys Xaa Ile 20 25 30 8611PRTArtificial sequenceSynthetic amino
acid sequence 86Trp Gly Gln Gly Thr Xaa Val Thr Val Ser Ser 1 5
10
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