U.S. patent application number 10/974931 was filed with the patent office on 2005-05-19 for antisense modulation of polo-like kinase expression.
Invention is credited to Freier, Susan M., Wyatt, Jacqueline.
Application Number | 20050107328 10/974931 |
Document ID | / |
Family ID | 31187040 |
Filed Date | 2005-05-19 |
United States Patent
Application |
20050107328 |
Kind Code |
A1 |
Wyatt, Jacqueline ; et
al. |
May 19, 2005 |
Antisense modulation of polo-like kinase expression
Abstract
Antisense compounds, compositions and methods are provided for
modulating the expression of polo-like kinase. The compositions
comprise antisense compounds, particularly antisense
oligonucleotides, targeted to nucleic acids encoding polo-like
kinase. Methods of using these compounds for modulation of
polo-like kinase expression and for treatment of diseases
associated with expression of polo-like kinase are provided.
Inventors: |
Wyatt, Jacqueline;
(Encinitas, CA) ; Freier, Susan M.; (San Diego,
CA) |
Correspondence
Address: |
LICATA & TYRRELL P.C.
66 E. MAIN STREET
MARLTON
NJ
08053
US
|
Family ID: |
31187040 |
Appl. No.: |
10/974931 |
Filed: |
October 27, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10974931 |
Oct 27, 2004 |
|
|
|
10209405 |
Jul 30, 2002 |
|
|
|
Current U.S.
Class: |
514/44A ;
435/6.18; 536/23.1 |
Current CPC
Class: |
C12N 2310/3341 20130101;
A61K 38/00 20130101; C12N 15/1137 20130101; C12N 2310/321 20130101;
C12N 2310/315 20130101; C12N 2310/321 20130101; C12N 2310/341
20130101; Y02P 20/582 20151101; C12N 2310/3525 20130101; C12N
2310/346 20130101 |
Class at
Publication: |
514/044 ;
536/023.1; 435/006 |
International
Class: |
A61K 048/00; C12Q
001/68; C07H 021/04 |
Claims
What is claimed is:
1. A compound 8 to 80 nucleobases in length targeted to a nucleic
acid molecule encoding polo-like kinase, wherein said compound
specifically hybridizes with said nucleic acid molecule encoding
polo-like kinase and inhibits the expression of polo-like kinase
and comprises SEQ ID NO: 18, 19, 23, 24, 25, 26, 27, 30, 31, 32,
33, 35, 37, 38, 39, 40, 41, 42, 43, 46, 47, 49, 51, 53, 55, 56, 58,
62, 63, 64, 66, 69, 70, 71, 74, 77, 79, 82, 88 or 89.
2. The compound of claim 1 which is an antisense
oligonucleotide.
3. The compound of claim 2 wherein the antisense oligonucleotide
comprises at least one modified internucleoside linkage.
4. The compound of claim 3 wherein the modified internucleoside
linkage is a phosphorothioate linkage.
5. The compound of claim 2 wherein the antisense oligonucleotide
comprises at least one modified sugar moiety.
6. The compound of claim 5 wherein the modified sugar moiety is a
2'-O-methoxyethyl sugar moiety.
7. The compound of claim 2 wherein the antisense oligonucleotide
comprises at least one modified nucleobase.
8. The compound of claim 7 wherein the modified nucleobase is a
5-methylcytosine.
9. The compound of claim 2 wherein the antisense oligonucleotide is
a chimeric oligonucleotide.
10. A compound 8 to 80 nucleobases in length which specifically
hybridizes with at least an 8-nucleobase portion of a preferred
target region on a nucleic acid molecule encoding polo-like
kinase.
11. A composition comprising the compound of claim 1 and a
pharmaceutically acceptable carrier or diluent.
12. The composition of claim 11 further comprising a colloidal
dispersion system.
13. The composition of claim 11 wherein the compound is an
antisense oligonucleotide.
14. A method of inhibiting the expression of polo-like kinase in
cells or tissues comprising contacting said cells or tissues with
the compound of claim 1 so that expression of polo-like kinase is
inhibited.
15. A method of treating an animal having a disease or condition
associated with polo-like kinase comprising administering to said
animal a therapeutically or prophylactically effective amount of
the compound of claim 1 so that expression of polo-like kinase is
inhibited.
16. A method of screening for an antisense compound, the method
comprising the steps of: a. contacting a preferred target region of
a nucleic acid molecule encoding polo-like kinase with one or more
candidate antisense compounds, said candidate antisense compounds
comprising at least an 8-nucleobase portion which is complementary
to said preferred target region, and b. selecting for one or more
candidate antisense compounds which inhibit the expression of a
nucleic acid molecule encoding polo-like kinase.
17. The method of claim 15 wherein the disease or condition is a
hyperproliferative disorder.
18. The method of claim 17 wherein the hyperproliferative disorder
is cancer.
19. The method of claim 18 wherein the cancer is non-small cell
lung cancer.
20. The method of claim 18 wherein the cancer is esophageal
carcinoma.
Description
INTRODUCTION
[0001] This application is a continuation of U.S. Ser. No.
10/209,405 filed Jul. 30, 2002 which is herein incorporated by
reference in its entirety.
FIELD OF THE INVENTION
[0002] The present invention provides compositions and methods for
modulating the expression of polo-like kinase. In particular, this
invention relates to compounds, particularly oligonucleotides,
specifically hybridizable with nucleic acids encoding polo-like
kinase. Such compounds have been shown to modulate the expression
of polo-like kinase.
BACKGROUND OF THE INVENTION
[0003] In eukaryotes, the regulated progression through the cell
cycle is controlled by a group of genes whose expression fluctuates
throughout the cycle. Cyclin dependent kinases (CDKs) and their
associated regulatory subunits, the cyclins, are the primary
regulators of the cell cycle. These heterodimeric complexes act by
phosphorylating downstream targets that, in turn, trigger signaling
events that liberate nuclear proteins necessary for entry into
subsequent phases of the cell cycle. Contributing to the activation
and inactivation of these complexes is a family of protein tyrosine
kinases known as polo-like kinases or Plks reviewed in (Nigg, Curr.
Opin. Cell. Biol., 1998, 10, 776-783).
[0004] As cells progress through the cell cycle, polo-like kinases
undergo fluctuations in abundance, activity and localization
thereby controlling multiple stages of the cell cycle (Hamanaka et
al., J. Biol. Chem., 1995, 270, 21086-21091). This family of
kinases also function in centrosome maturation (Lane and Nigg, J.
Cell. Biol., 1996, 135, 1701-1713), bipolar spindle formation
(Golsteyn et al., J. Cell. Biol., 1995, 129, 1617-1628), DNA damage
checkpoint adaptation (Arnaud et al., Chromosoma, 1998, 107,
424-429) and regulation of the anaphase-promoting complex (Kotani
et al., Mol. Cell, 1998, 1, 371-380)
[0005] It is currently believed that a number of diseases and/or
disorders are a result of either aberrant expression or functional
mutations in the molecular components of kinase cascades.
Consequently, considerable attention has been devoted to the
characterization of these proteins.
[0006] Polo-like kinase (also known as polo-like kinase 1, plk-1,
plk and stpk13) was the first member of this family to be
identified as the mammalian counterpart to the Drosophila
melanogaster gene, polo, required for passage through mitosis
(Golsteyn et al., J. Cell. Sci., 1994, 107, 1509-1517; Hamanaka et
al., Cell. Growth Differ., 1994, 5, 249-257; Holtrich et al., Proc.
Natl. Acad. Sci. U.S.A., 1994, 91, 1736-1740; Lake and Jelinek,
Mol. Cell. Biol., 1993, 13, 7793-7801). Expression of polo-like
kinase was shown to correlate with mitotic activity of cells
(Golsteyn et al., J. Cell. Sci., 1994, 107, 1509-1517; Lake and
Jelinek, Mol. Cell. Biol., 1993, 13, 7793-7801) and to be high in
tumors of several origins including lung, colon, stomach, smooth
muscle, and esophagus (Holtrich et al., Proc. Natl. Acad. Sci.
U.S.A., 1994, 91, 1736-1740). Overexpression or constitutive
expression of polo-like kinase has also been shown to induce
malignant transformation of mammalian cells (Mundt et al., Biochem.
Biophys. Res. Commun., 1997, 239, 377-385; Smith et al., Biochem.
Biophys. Res. Commun., 1997, 234, 397-405). Microinjection of
polo-like kinase antisense RNA into growing mouse NIH3T3 cells was
shown to block tritiated thymidine incorporation, suggesting that
polo-like kinase expression is restricted to and required by
proliferating cells (Hamanaka et al., Cell. Growth Differ., 1994,
5, 249-257).
[0007] Further support of this conclusion is found in studies
showing that elevated levels of polo-like kinase expression are
significant prognostic indicators of non-small cell lung cancer
(Wolf et al., Oncogene, 1997, 14, 543-549), breast and lung cancer
(Yuan et al., Am. J. Pathol., 1997, 150, 1165-1172), esophageal
carcinoma (Tokumitsu et al., Int. J. Oncol., 1999, 15, 687-692) and
squamous cell carcinomas of the head and neck (Knecht et al.,
Cancer Res., 1999, 59, 2794-2797).
[0008] The pharmacological modulation of polo-like kinase activity,
expression, or function may therefore be an appropriate point of
therapeutic intervention in pathological conditions.
[0009] Currently, there are no known therapeutic agents which
effectively inhibit the synthesis of polo-like kinase and
investigative strategies aimed at modulating polo-like kinase
function have involved the use of antibodies, and antisense
expression vectors and antisense oligonucleotides. Elez et al. used
an antisense strategy to inhibit cell proliferation of cancer cells
in cell culture and in the nude mouse. In these studies one
phosphorothioate antisense oligonucleotide inhibited the expression
of polo-like kinase in culutured A549 cells leading to the loss of
cell viability and anti-tumor activity in nude mice A549 xenografts
(Elez et al., Biochemical and Biophysical Research Communications,
2000, 209, 352-356).
[0010] However, these strategies are untested as therapeutic
protocols and consequently there remains a long felt need for
agents capable of effectively inhibiting polo-like kinase
function.
[0011] Antisense technology is emerging as an effective means for
reducing the expression of specific gene products and may therefore
prove to be uniquely useful in a number of therapeutic, diagnostic,
and research applications for the modulation of polo-like kinase
expression.
[0012] The present invention provides compositions and methods for
modulating polo-like kinase expression.
SUMMARY OF THE INVENTION
[0013] The present invention is directed to compounds, particularly
antisense oligonucleotides, which are targeted to a nucleic acid
encoding polo-like kinase, and which modulate the expression of
polo-like kinase. Pharmaceutical and other compositions comprising
the compounds of the invention are also provided. Further provided
are methods of modulating the expression of polo-like kinase in
cells or tissues comprising contacting said cells or tissues with
one or more of the antisense compounds or compositions of the
invention. Further provided are methods of treating an animal,
particularly a human, suspected of having or being prone to a
disease or condition associated with expression of polo-like kinase
by administering a therapeutically or prophylactically effective
amount of one or more of the antisense compounds or compositions of
the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0014] The present invention employs oligomeric compounds,
particularly antisense oligonucleotides, for use in modulating the
function of nucleic acid molecules encoding polo-like kinase,
ultimately modulating the amount of polo-like kinase produced. This
is accomplished by providing antisense compounds which specifically
hybridize with one or more nucleic acids encoding polo-like kinase.
As used herein, the terms "target nucleic acid" and "nucleic acid
encoding polo-like kinase" encompass DNA encoding polo-like kinase,
RNA (including pre-mRNA and mRNA) transcribed from such DNA, and
also cDNA derived from such RNA. The specific hybridization of an
oligomeric compound with its target nucleic acid interferes with
the normal function of the nucleic acid. This modulation of
function of a target nucleic acid by compounds which specifically
hybridize to it is generally referred to as "antisense". The
functions of DNA to be interfered with include replication and
transcription. The functions of RNA to be interfered with include
all vital functions such as, for example, translocation of the RNA
to the site of protein translation, translocation of the RNA to
sites within the cell which are distant from the site of RNA
synthesis, translation of protein from the RNA, splicing of the RNA
to yield one or more mRNA species, and catalytic activity which may
be engaged in or facilitated by the RNA. The overall effect of such
interference with target nucleic acid function is modulation of the
expression of polo-like kinase. In the context of the present
invention, "modulation" means either an increase (stimulation) or a
decrease (inhibition) in the expression of a gene. In the context
of the present invention, inhibition is the preferred form of
modulation of gene expression and mRNA is a preferred target.
[0015] It is preferred to target specific nucleic acids for
antisense. "Targeting" an antisense compound to a particular
nucleic acid, in the context of this invention, is a multistep
process. The process usually begins with the identification of a
nucleic acid sequence whose function is to be modulated. This may
be, for example, a cellular gene (or mRNA transcribed from the
gene) whose expression is associated with a particular disorder or
disease state, or a nucleic acid molecule from an infectious agent.
In the present invention, the target is a nucleic acid molecule
encoding polo-like kinase. The targeting process also includes
determination of a site or sites within this gene for the antisense
interaction to occur such that the desired effect, e.g., detection
or modulation of expression of the protein, will result. Within the
context of the present invention, a preferred intragenic site is
the region encompassing the translation initiation or termination
codon of the open reading frame (ORF) of the gene. Since, as is
known in the art, the translation initiation codon is typically
5'-AUG (in transcribed mRNA molecules; 5'-ATG in the corresponding
DNA molecule), the translation initiation codon is also referred to
as the "AUG codon," the "start codon" or the "AUG start codon". A
minority of genes have a translation initiation codon having the
RNA sequence 5'-GUG, 5'-UUG or 5'-CUG, and 5'-AUA, 5'-ACG and
5'-CUG have been shown to function in vivo. Thus, the terms
"translation initiation codon" and "start codon" can encompass many
codon sequences, even though the initiator amino acid in each
instance is typically methionine (in eukaryotes) or
formylmethionine (in prokaryotes). It is also known in the art that
eukaryotic and prokaryotic genes may have two or more alternative
start codons, any one of which may be preferentially utilized for
translation initiation in a particular cell type or tissue, or
under a particular set of conditions. In the context of the
invention, "start codon" and "translation initiation codon" refer
to the codon or codons that are used in vivo to initiate
translation of an mRNA molecule transcribed from a gene encoding
polo-like kinase, regardless of the sequence(s) of such codons.
[0016] It is also known in the art that a translation termination
codon (or "stop codon") of a gene may have one of three sequences,
i.e., 5'-UAA, 5'-UAG and 5'-UGA (the corresponding DNA sequences
are 5'-TAA, 5'-TAG and 5'-TGA, respectively). The terms "start
codon region" and "translation initiation codon region" refer to a
portion of such an mRNA or gene that encompasses from about 25 to
about 50 contiguous nucleotides in either direction (i.e., 5' or
3') from a translation initiation codon. Similarly, the terms "stop
codon region" and "translation termination codon region" refer to a
portion of such an mRNA or gene that encompasses from about 25 to
about 50 contiguous nucleotides in either direction (i.e., 5' or
3') from a translation termination codon.
[0017] The open reading frame (ORF) or "coding region," which is
known in the art to refer to the region between the translation
initiation codon and the translation termination codon, is also a
region which may be targeted effectively. Other target regions
include the 5' untranslated region (5'UTR), known in the art to
refer to the portion of an mRNA in the 5' direction from the
translation initiation codon, and thus including nucleotides
between the 5' cap site and the translation initiation codon of an
mRNA or corresponding nucleotides on the gene, and the 3'
untranslated region (3'UTR), known in the art to refer to the
portion of an mRNA in the 3' direction from the translation
termination codon, and thus including nucleotides between the
translation termination codon and 3' end of an mRNA or
corresponding nucleotides on the gene. The 5' cap of an mRNA
comprises an N7-methylated guanosine residue joined to the 5'-most
residue of the mRNA via a 5'-5' triphosphate linkage. The 5' cap
region of an mRNA is considered to include the 5' cap structure
itself as well as the first 50 nucleotides adjacent to the cap. The
5' cap region may also be a preferred target region.
[0018] Although some eukaryotic mRNA transcripts are directly
translated, many contain one or more regions, known as "introns,"
which are excised from a transcript before it is translated. The
remaining (and therefore translated) regions are known as "exons"
and are spliced together to form a continuous mRNA sequence. mRNA
splice sites, i.e., intron-exon junctions, may also be preferred
target regions, and are particularly useful in situations where
aberrant splicing is implicated in disease, or where an
overproduction of a particular mRNA splice product is implicated in
disease. Aberrant fusion junctions due to rearrangements or
deletions are also preferred targets. mRNA transcripts produced via
the process of splicing of two (or more) mRNAs from different gene
sources are known as "fusion transcripts". It has also been found
that introns can be effective, and therefore preferred, target
regions for antisense compounds targeted, for example, to DNA or
pre-mRNA.
[0019] It is also known in the art that alternative RNA transcripts
can be produced from the same genomic region of DNA. These
alternative transcripts are generally known as "variants". More
specifically, "pre-mRNA variants" are transcripts produced from the
same genomic DNA that differ from other transcripts produced from
the same genomic DNA in either their start or stop position and
contain both intronic and extronic regions.
[0020] Upon excision of one or more exon or intron regions or
portions thereof during splicing, pre-mRNA variants produce smaller
"mRNA variants". Consequently, mRNA variants are processed pre-mRNA
variants and each unique pre-mRNA variant must always produce a
unique mRNA variant as a result of splicing. These mRNA variants
are also known as "alternative splice variants". If no splicing of
the pre-mRNA variant occurs then the pre-mRNA variant is identical
to the mRNA variant.
[0021] It is also known in the art that variants can be produced
through the use of alternative signals to start or stop
transcription and that pre-mRNAs and mRNAs can possess more that
one start codon or stop codon. Variants that originate from a
pre-mRNA or mRNA that use alternative start codons are known as
"alternative start variants" of that pre-mRNA or mRNA. Those
transcripts that use an alternative stop codon are known as
"alternative stop variants" of that pre-mRNA or mRNA. One specific
type of alternative stop variant is the "polyA variant" in which
the multiple transcripts produced result from the alternative
selection of one of the "polyA stop signals" by the transcription
machinery, thereby producing transcripts that terminate at unique
polyA sites.
[0022] Once one or more target sites have been identified,
oligonucleotides are chosen which are sufficiently complementary to
the target, i.e., hybridize sufficiently well and with sufficient
specificity, to give the desired effect.
[0023] In the context of this invention, "hybridization" means
hydrogen bonding, which may be Watson-Crick, Hoogsteen or reversed
Hoogsteen hydrogen bonding, between complementary nucleoside or
nucleotide bases. For example, adenine and thymine are
complementary nucleobases which pair through the formation of
hydrogen bonds. "Complementary," as used herein, refers to the
capacity for precise pairing between two nucleotides. For example,
if a nucleotide at a certain position of an oligonucleotide is
capable of hydrogen bonding with a nucleotide at the same position
of a DNA or RNA molecule, then the oligonucleotide and the DNA or
RNA are considered to be complementary to each other at that
position. The oligonucleotide and the DNA or RNA are complementary
to each other when a sufficient number of corresponding positions
in each molecule are occupied by nucleotides which can hydrogen
bond with each other. Thus, "specifically hybridizable" and
"complementary" are terms which are used to indicate a sufficient
degree of complementarity or precise pairing such that stable and
specific binding occurs between the oligonucleotide and the DNA or
RNA target. It is understood in the art that the sequence of an
antisense compound need not be 100% complementary to that of its
target nucleic acid to be specifically hybridizable.
[0024] An antisense compound is specifically hybridizable when
binding of the compound to the target DNA or RNA molecule
interferes with the normal function of the target DNA or RNA to
cause a loss of activity, and there is a sufficient degree of
complementarity to avoid non-specific binding of the antisense
compound to non-target sequences under conditions in which specific
binding is desired, i.e., under physiological conditions in the
case of in vivo assays or therapeutic treatment, and in the case of
in vitro assays, under conditions in which the assays are
performed. It is preferred that the antisense compounds of the
present invention comprise at least 80% sequence complementarity to
a target region within the target nucleic acid, moreover that they
comprise 90% sequence complementarity and even more comprise 95%
sequence complementarity to the target region within the target
nucleic acid sequence to which they are targeted. For example, an
antisense compound in which 18 of 20 nucleobases of the antisense
compound are complementary, and would therefore specifically
hybridize, to a target region would represent 90 percent
complementarity. Percent complementarity of an antisense compound
with a region of a target nucleic acid can be determined routinely
using basic local alignment search tools (BLAST programs) (Altschul
et al., J. Mol. Biol., 1990, 215, 403-410; Zhang and Madden, Genome
Res., 1997, 7, 649-656).
[0025] Antisense and other compounds of the invention, which
hybridize to the target and inhibit expression of the target, are
identified through experimentation, and representative sequences of
these compounds are hereinbelow identified as preferred embodiments
of the invention. The sites to which these preferred antisense
compounds are specifically hybridizable are hereinbelow referred to
as "preferred target regions" and are therefore preferred sites for
targeting. As used herein the term "preferred target region" is
defined as at least an 8-nucleobase portion of a target region to
which an active antisense compound is targeted. While not wishing
to be bound by theory, it is presently believed that these target
regions represent regions of the target nucleic acid which are
accessible for hybridization.
[0026] While the specific sequences of particular preferred target
regions are set forth below, one of skill in the art will recognize
that these serve to illustrate and describe particular embodiments
within the scope of the present invention. Additional preferred
target regions may be identified by one having ordinary skill.
[0027] Target regions 8-80 nucleobases in length comprising a
stretch of at least eight (8) consecutive nucleobases selected from
within the illustrative preferred target regions are considered to
be suitable preferred target regions as well.
[0028] Exemplary good preferred target regions include DNA or RNA
sequences that comprise at least the 8 consecutive nucleobases from
the 5'-terminus of one of the illustrative preferred target regions
(the remaining nucleobases being a consecutive stretch of the same
DNA or RNA beginning immediately upstream of the 5'-terminus of the
target region and continuing until the DNA or RNA contains about 8
to about 80 nucleobases). Similarly good preferred target regions
are represented by DNA or RNA sequences that comprise at least the
8 consecutive nucleobases from the 3'-terminus of one of the
illustrative preferred target regions (the remaining nucleobases
being a consecutive stretch of the same DNA or RNA beginning
immediately downstream of the 3'-terminus of the target region and
continuing until the DNA or RNA contains about 8 to about 80
nucleobases). One having skill in the art, once armed with the
empirically-derived preferred target regions illustrated herein
will be able, without undue experimentation, to identify further
preferred target regions. In addition, one having ordinary skill in
the art will also be able to identify additional compounds,
including oligonucleotide probes and primers, that specifically
hybridize to these preferred target regions using techniques
available to the ordinary practitioner in the art.
[0029] Antisense compounds are commonly used as research reagents
and diagnostics. For example, antisense oligonucleotides, which are
able to inhibit gene expression with exquisite specificity, are
often used by those of ordinary skill to elucidate the function of
particular genes. Antisense compounds are also used, for example,
to distinguish between functions of various members of a biological
pathway. Antisense modulation has, therefore, been harnessed for
research use.
[0030] For use in kits and diagnostics, the antisense compounds of
the present invention, either alone or in combination with other
antisense compounds or therapeutics, can be used as tools in
differential and/or combinatorial analyses to elucidate expression
patterns of a portion or the entire complement of genes expressed
within cells and tissues.
[0031] Expression patterns within cells or tissues treated with one
or more antisense compounds are compared to control cells or
tissues not treated with antisense compounds and the patterns
produced are analyzed for differential levels of gene expression as
they pertain, for example, to disease association, signaling
pathway, cellular localization, expression level, size, structure
or function of the genes examined. These analyses can be performed
on stimulated or unstimulated cells and in the presence or absence
of other compounds which affect expression patterns.
[0032] Examples of methods of gene expression analysis known in the
art include DNA arrays or microarrays (Brazma and Vilo, FEBS Lett.,
2000, 480, 17-24; Celis, et al., FEBS Lett., 2000, 480, 2-16), SAGE
(serial analysis of gene expression) (Madden, et al., Drug Discov.
Today, 2000, 5, 415-425), READS (restriction enzyme amplification
of digested cDNAs) (Prashar and Weissman, Methods Enzymol., 1999,
303, 258-72), TOGA (total gene expression analysis) (Sutcliffe, et
al., Proc. Natl. Acad. Sci. U.S.A., 2000, 97, 1976-81), protein
arrays and proteomics (Celis, et al., FEBS Lett., 2000, 480, 2-16;
Jungblut, et al., Electrophoresis, 1999, 20, 2100-10), expressed
sequence tag (EST) sequencing (Celis, et al., FEBS Lett., 2000,
480, 2-16; Larsson, et al., J. Biotechnol., 2000, 80, 143-57),
subtractive RNA fingerprinting (SuRF) (Fuchs, et al., Anal.
Biochem., 2000, 286, 91-98; Larson, et al., Cytometry, 2000, 41,
203-208), subtractive cloning, differential display (DD) (Jurecic
and Belmont, Curr. Opin. Microbiol., 2000, 3, 316-21), comparative
genomic hybridization (Carulli, et al., J. Cell Biochem. Suppl.,
1998, 31, 286-96), FISH (fluorescent in situ hybridization)
techniques (Going and Gusterson, Eur. J. Cancer, 1999, 35,
1895-904) and mass spectrometry methods (reviewed in To, Comb.
Chem. High Throughput Screen, 2000, 3, 235-41).
[0033] The specificity and sensitivity of antisense is also
harnessed by those of skill in the art for therapeutic uses.
Antisense oligonucleotides have been employed as therapeutic
moieties in the treatment of disease states in animals and man.
Antisense oligonucleotide drugs, including ribozymes, have been
safely and effectively administered to humans and numerous clinical
trials are presently underway. It is thus established that
oligonucleotides can be useful therapeutic modalities that can be
configured to be useful in treatment regimes for treatment of
cells, tissues and animals, especially humans.
[0034] In the context of this invention, the term "oligonucleotide"
refers to an oligomer or polymer of ribonucleic acid (RNA) or
deoxyribonucleic acid (DNA) or mimetics thereof. This term includes
oligonucleotides composed of naturally-occurring nucleobases,
sugars and covalent internucleoside (backbone) linkages as well as
oligonucleotides having non-naturally-occurring portions which
function similarly. Such modified or substituted oligonucleotides
are often preferred over native forms because of desirable
properties such as, for example, enhanced cellular uptake, enhanced
affinity for nucleic acid target and increased stability in the
presence of nucleases.
[0035] While antisense oligonucleotides are a preferred form of
antisense compound, the present invention comprehends other
oligomeric antisense compounds, including but not limited to
oligonucleotide mimetics such as are described below. The antisense
compounds in accordance with this invention preferably comprise
from about 8 to about 80 nucleobases (i.e. from about 8 to about 80
linked nucleosides). Particularly preferred antisense compounds are
antisense oligonucleotides from about 8 to about 50 nucleobases,
even more preferably those comprising from about 12 to about 30
nucleobases. Antisense compounds include ribozymes, external guide
sequence (EGS) oligonucleotides (oligozymes), and other short
catalytic RNAs or catalytic oligonucleotides which hybridize to the
target nucleic acid and modulate its expression.
[0036] Antisense compounds 8-80 nucleobases in length comprising a
stretch of at least eight (8) consecutive nucleobases selected from
within the illustrative antisense compounds are considered to be
suitable antisense compounds as well.
[0037] Exemplary preferred antisense compounds include DNA or RNA
sequences that comprise at least the 8 consecutive nucleobases from
the 5'-terminus of one of the illustrative preferred antisense
compounds (the remaining nucleobases being a consecutive stretch of
the same DNA or RNA beginning immediately upstream of the
5'-terminus of the antisense compound which is specifically
hybridizable to the target nucleic acid and continuing until the
DNA or RNA contains about 8 to about 80 nucleobases). Similarly
preferred antisense compounds are represented by DNA or RNA
sequences that comprise at least the 8 consecutive nucleobases from
the 3'-terminus of one of the illustrative preferred antisense
compounds (the remaining nucleobases being a consecutive stretch of
the same DNA or RNA beginning immediately downstream of the
3'-terminus of the antisense compound which is specifically
hybridizable to the target nucleic acid and continuing until the
DNA or RNA contains about 8 to about 80 nucleobases). One having
skill in the art, once armed with the empirically-derived preferred
antisense compounds illustrated herein will be able, without undue
experimentation, to identify further preferred antisense
compounds.
[0038] Antisense and other compounds of the invention, which
hybridize to the target and inhibit expression of the target, are
identified through experimentation, and representative sequences of
these compounds are herein identified as preferred embodiments of
the invention. While specific sequences of the antisense compounds
are set forth herein, one of skill in the art will recognize that
these serve to illustrate and describe particular embodiments
within the scope of the present invention. Additional preferred
antisense compounds may be identified by one having ordinary
skill.
[0039] As is known in the art, a nucleoside is a base-sugar
combination. The base portion of the nucleoside is normally a
heterocyclic base. The two most common classes of such heterocyclic
bases are the purines and the pyrimidines. Nucleotides are
nucleosides that further include a phosphate group covalently
linked to the sugar portion of the nucleoside. For those
nucleosides that include a pentofuranosyl sugar, the phosphate
group can be linked to either the 2', 3' or 5' hydroxyl moiety of
the sugar. In forming oligonucleotides, the phosphate groups
covalently link adjacent nucleosides to one another to form a
linear polymeric compound. In turn, the respective ends of this
linear polymeric structure can be further joined to form a circular
structure, however, open linear structures are generally preferred.
In addition, linear structures may also have internal nucleobase
complementarity and may therefore fold in a manner as to produce a
double stranded structure. Within the oligonucleotide structure,
the phosphate groups are commonly referred to as forming the
internucleoside backbone of the oligonucleotide. The normal linkage
or backbone of RNA and DNA is a 3' to 5' phosphodiester
linkage.
[0040] Specific examples of preferred antisense compounds useful in
this invention include oligonucleotides containing modified
backbones or non-natural internucleoside linkages. As defined in
this specification, oligonucleotides having modified backbones
include those that retain a phosphorus atom in the backbone and
those that do not have a phosphorus atom in the backbone. For the
purposes of this specification, and as sometimes referenced in the
art, modified oligonucleotides that do not have a phosphorus atom
in their internucleoside backbone can also be considered to be
oligonucleosides.
[0041] Preferred modified oligonucleotide backbones include, for
example, phosphorothioates, chiral phosphorothioates,
phosphorodithioates, phosphotriesters, aminoalkylphosphotriesters,
methyl and other alkyl phosphonates including 3'-alkylene
phosphonates, 5'-alkylene phosphonates and chiral phosphonates,
phosphinates, phosphoramidates including 3'-amino phosphoramidate
and aminoalkylphosphoramidates, thionophosphoramidates,
thionoalkylphosphonates, thionoalkylphosphotriest- ers,
selenophosphates and boranophosphates having normal 3'-5' linkages,
2'-5' linked analogs of these, and those having inverted polarity
wherein one or more internucleotide linkages is a 3' to 3', 5' to
5' or 2' to 2' linkage. Preferred oligonucleotides having inverted
polarity comprise a single 3' to 3' linkage at the 3'-most
internucleotide linkage i.e. a single inverted nucleoside residue
which may be abasic (the nucleobase is missing or has a hydroxyl
group in place thereof). Various salts, mixed salts and free acid
forms are also included.
[0042] Representative United States patents that teach the
preparation of the above phosphorus-containing linkages include,
but are not limited to, U.S. Pat. Nos. 3,687,808; 4,469,863;
4,476,301; 5,023,243; 5,177,196; 5,188,897; 5,264,423; 5,276,019;
5,278,302; 5,286,717; 5,321,131; 5,399,676; 5,405,939; 5,453,496;
5,455,233; 5,466,677; 5,476,925; 5,519,126; 5,536,821; 5,541,306;
5,550,111; 5,563,253; 5,571,799; 5,587,361; 5,194,599; 5,565,555;
5,527,899; 5,721,218; 5,672,697 and 5,625,050, certain of which are
commonly owned with this application, and each of which is herein
incorporated by reference.
[0043] Preferred modified oligonucleotide backbones that do not
include a phosphorus atom therein have backbones that are formed by
short chain alkyl or cycloalkyl internucleoside linkages, mixed
heteroatom and alkyl or cycloalkyl internucleoside linkages, or one
or more short chain heteroatomic or heterocyclic internucleoside
linkages. These include those having morpholino linkages (formed in
part from the sugar portion of a nucleoside); siloxane backbones;
sulfide, sulfoxide and sulfone backbones; formacetyl and
thioformacetyl backbones; methylene formacetyl and thioformacetyl
backbones; riboacetyl backbones; alkene containing backbones;
sulfamate backbones; methyleneimino and methylenehydrazino
backbones; sulfonate and sulfonamide backbones; amide backbones;
and others having mixed N, O, S and CH.sub.2 component parts.
[0044] Representative United States patents that teach the
preparation of the above oligonucleosides include, but are not
limited to, U.S. Pat. Nos. 5,034,506; 5,166,315; 5,185,444;
5,214,134; 5,216,141; 5,235,033; 5,264,562; 5,264,564; 5,405,938;
5,434,257; 5,466,677; 5,470,967; 5,489,677; 5,541,307; 5,561,225;
5,596,086; 5,602,240; 5,610,289; 5,602,240; 5,608,046; 5,610,289;
5,618,704; 5,623,070; 5,663,312; 5,633,360; 5,677,437; 5,792,608;
5,646,269 and 5,677,439, certain of which are commonly owned with
this application, and each of which is herein incorporated by
reference.
[0045] In other preferred oligonucleotide mimetics, both the sugar
and the internucleoside linkage, i.e., the backbone, of the
nucleotide units are replaced with novel groups. The base units are
maintained for hybridization with an appropriate nucleic acid
target compound. One such oligomeric compound, an oligonucleotide
mimetic that has been shown to have excellent hybridization
properties, is referred to as a peptide nucleic acid (PNA). In PNA
compounds, the sugar-backbone of an oligonucleotide is replaced
with an amide containing backbone, in particular an
aminoethylglycine backbone. The nucleobases are retained and are
bound directly or indirectly to aza nitrogen atoms of the amide
portion of the backbone. Representative United States patents that
teach the preparation of PNA compounds include, but are not limited
to, U.S. Pat. Nos. 5,539,082; 5,714,331; and 5,719,262, each of
which is herein incorporated by reference. Further teaching of PNA
compounds can be found in Nielsen et al., Science, 1991, 254,
1497-1500.
[0046] Most preferred embodiments of the invention are
oligonucleotides with phosphorothioate backbones and
oligonucleosides with heteroatom backbones, and in particular
--CH.sub.2--NH--O--CH.sub.2--,
--CH.sub.2--N(CH.sub.3)--O--CH.sub.2-- [known as a methylene
(methylimino) or MMI backbone], --CH.sub.2--O--N(CH.sub.3)
--CH.sub.2--, --CH.sub.2--N(CH.sub.3)--N(CH.sub.3)--CH.sub.2-- and
--O--N(CH.sub.3)--CH.sub.2--CH.sub.2-- [wherein the native
phosphodiester backbone is represented as --O--P--O--CH.sub.2--] of
the above referenced U.S. Pat. No. 5,489,677, and the amide
backbones of the above referenced U.S. Pat. No. 5,602,240. Also
preferred are oligonucleotides having morpholino backbone
structures of the above-referenced U.S. Pat. No. 5,034,506.
[0047] Modified oligonucleotides may also contain one or more
substituted sugar moieties. Preferred oligonucleotides comprise one
of the following at the 2' position: OH; F; O-, S-, or N-alkyl; O-,
S-, or N-alkenyl; O-, S- or N-alkynyl; or O-alkyl-O-alkyl, wherein
the alkyl, alkenyl and alkynyl may be substituted or unsubstituted
C.sub.1 to C.sub.10 alkyl or C.sub.2 to C.sub.10 alkenyl and
alkynyl. Particularly preferred are
O[(CH.sub.2).sub.nO].sub.mCH.sub.3, O(CH.sub.2).sub.nOCH.sub.3,
O(CH.sub.2).sub.nNH.sub.2, O(CH.sub.2).sub.nCH.sub.3,
O(CH.sub.2).sub.nONH.sub.2, and
O(CH.sub.2).sub.nON[(CH.sub.2).sub.nCH.su- b.3].sub.2, where n and
m are from 1 to about 10. Other preferred oligonucleotides comprise
one of the following at the 2' position: C.sub.1 to C.sub.10 lower
alkyl, substituted lower alkyl, alkenyl, alkynyl, alkaryl, aralkyl,
O-alkaryl or O-aralkyl, SH, SCH.sub.3, OCN, Cl, Br, CN, CF.sub.3,
OCF.sub.3, SOCH.sub.3, SO.sub.2CH.sub.3, ONO.sub.2, NO.sub.2,
N.sub.3, NH.sub.2, heterocycloalkyl, heterocycloalkaryl,
aminoalkylamino, polyalkylamino, substituted silyl, an RNA cleaving
group, a reporter group, an intercalator, a group for improving the
pharmacokinetic properties of an oligonucleotide, or a group for
improving the pharmacodynamic properties of an oligonucleotide, and
other substituents having similar properties. A preferred
modification includes 2'-methoxyethoxy
(2'-O--CH.sub.2CH.sub.2OCH.sub.3, also known as
2'-O-(2-methoxyethyl) or 2'-MOE) (Martin et al., Helv. Chim. Acta,
1995, 78, 486-504) i.e., an alkoxyalkoxy group. A further preferred
modification includes 2'-dimethylaminooxyethoxy, i.e., a
O(CH.sub.2).sub.2ON(CH.sub.3).sub.2 group, also known as 2'-DMAOE,
as described in examples hereinbelow, and
2'-dimethylaminoethoxyethoxy (also known in the art as
2'-O-dimethyl-aminoethoxy-ethyl or 2'-DMAEOE), i.e.,
2'-O--CH.sub.2--O--CH.sub.2--N(CH.sub.3).sub.2, also described in
examples hereinbelow.
[0048] Other preferred modifications include 2'-methoxy
(2'-O--CH.sub.3), 2'-aminopropoxy
(2'-OCH.sub.2CH.sub.2CH.sub.2NH.sub.2), 2'-allyl
(2'-CH.sub.2--CH.dbd.CH.sub.2), 2'-O-allyl
(2'-O--CH.sub.2--CH.dbd.CH.sub- .2) and 2'-fluoro (2'-F). The
2'-modification may be in the arabino (up) position or ribo (down)
position. A preferred 2'-arabino modification is 2'-F. Similar
modifications may also be made at other positions on the
oligonucleotide, particularly the 3' position of the sugar on the
3' terminal nucleotide or in 2'-5' linked oligonucleotides and the
5' position of 5' terminal nucleotide. Oligonucleotides may also
have sugar mimetics such as cyclobutyl moieties in place of the
pentofuranosyl sugar. Representative United States patents that
teach the preparation of such modified sugar structures include,
but are not limited to, U.S. Pat. Nos. 4,981,957; 5,118,800;
5,319,080; 5,359,044; 5,393,878; 5,446,137; 5,466,786; 5,514,785;
5,519,134; 5,567,811; 5,576,427; 5,591,722; 5,597,909; 5,610,300;
5,627,053; 5,639,873; 5,646,265; 5,658,873; 5,670,633; 5,792,747;
and 5,700,920, certain of which are commonly owned with the instant
application, and each of which is herein incorporated by reference
in its entirety.
[0049] A further preferred modification includes Locked Nucleic
Acids (LNAs) in which the 2'-hydroxyl group is linked to the 3' or
4' carbon atom of the sugar ring thereby forming a bicyclic sugar
moiety. The linkage is preferably a methelyne (--CH.sub.2--).sub.n
group bridging the 2' oxygen atom and the 4' carbon atom wherein n
is 1 or 2. LNAs and preparation thereof are described in WO
98/39352 and WO 99/14226.
[0050] Oligonucleotides may also include nucleobase (often referred
to in the art simply as "base") modifications or substitutions. As
used herein, "unmodified" or "natural" nucleobases include the
purine bases adenine (A) and guanine (G), and the pyrimidine bases
thymine (T), cytosine (C) and uracil (U). Modified nucleobases
include other synthetic and natural nucleobases such as
5-methylcytosine (5-me-C), 5-hydroxymethyl cytosine, xanthine,
hypoxanthine, 2-aminoadenine, 6-methyl and other alkyl derivatives
of adenine and guanine, 2-propyl and other alkyl derivatives of
adenine and guanine, 2-thiouracil, 2-thiothymine and
2-thiocytosine, 5-halouracil and cytosine, 5-propynyl
(--C.ident.C--CH.sub.3) uracil and cytosine and other alkynyl
derivatives of pyrimidine bases, 6-azo uracil, cytosine and
thymine, 5-uracil (pseudouracil), 4-thiouracil, 8-halo, 8-amino,
8-thiol, 8-thioalkyl, 8-hydroxyl and other 8-substituted adenines
and guanines, 5-halo particularly 5-bromo, 5-trifluoromethyl and
other 5-substituted uracils and cytosines, 7-methylguanine and
7-methyladenine, 2-F-adenine, 2-amino-adenine, 8-azaguanine and
8-azaadenine, 7-deazaguanine and 7-deazaadenine and 3-deazaguanine
and 3-deazaadenine. Further modified nucleobases include tricyclic
pyrimidines such as phenoxazine
cytidine(1H-pyrimido[5,4-b][1,4]benzoxazi- n-2(3H)-one),
phenothiazine cytidine (1H-pyrimido[5,4-b][1,4]benzothiazin--
2(3H)-one), G-clamps such as a substituted phenoxazine cytidine
(e.g.
9-(2-aminoethoxy)-H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one),
carbazole cytidine (2H-pyrimido[4,5-b]indol-2-one), pyridoindole
cytidine (H-pyrido[3',2':4,5]pyrrolo[2,3-d]pyrimidin-2-one).
Modified nucleobases may also include those in which the purine or
pyrimidine base is replaced with other heterocycles, for example
7-deaza-adenine, 7-deazaguanosine, 2-aminopyridine and 2-pyridone.
Further nucleobases include those disclosed in U.S. Pat. No.
3,687,808, those disclosed in The Concise Encyclopedia Of Polymer
Science And Engineering, pages 858-859, Kroschwitz, J. I., ed. John
Wiley & Sons, 1990, those disclosed by Englisch et al.,
Angewandte Chemie, International Edition, 1991, 30, 613, and those
disclosed by Sanghvi, Y. S., Chapter 15, Antisense Research and
Applications, pages 289-302, Crooke, S. T. and Lebleu, B., ed., CRC
Press, 1993. Certain of these nucleobases are particularly useful
for increasing the binding affinity of the oligomeric compounds of
the invention. These include 5-substituted pyrimidines,
6-azapyrimidines and N-2, N-6 and O-6 substituted purines,
including 2-aminopropyladenine, 5-propynyluracil and
5-propynylcytosine. 5-methylcytosine substitutions have been shown
to increase nucleic acid duplex stability by 0.6-1.2.degree. C.
(Sanghvi, Y. S., Crooke, S. T. and Lebleu, B., eds., Antisense
Research and Applications, CRC Press, Boca Raton, 1993, pp.
276-278) and are presently preferred base substitutions, even more
particularly when combined with 2'-O-methoxyethyl sugar
modifications.
[0051] Representative United States patents that teach the
preparation of certain of the above noted modified nucleobases as
well as other modified nucleobases include, but are not limited to,
the above noted U.S. Pat. No. 3,687,808, as well as U.S. Pat. Nos.
4,845,205; 5,130,302; 5,134,066; 5,175,273; 5,367,066; 5,432,272;
5,457,187; 5,459,255; 5,484,908; 5,502,177; 5,525,711; 5,552,540;
5,587,469; 5,594,121, 5,596,091; 5,614,617; 5,645,985; 5,830,653;
5,763,588; 6,005,096; and 5,681,941, certain of which are commonly
owned with the instant application, and each of which is herein
incorporated by reference, and U.S. Pat. No. 5,750,692, which is
commonly owned with the instant application and also herein
incorporated by reference.
[0052] Another modification of the oligonucleotides of the
invention involves chemically linking to the oligonucleotide one or
more moieties or conjugates which enhance the activity, cellular
distribution or cellular uptake of the oligonucleotide. The
compounds of the invention can include conjugate groups covalently
bound to functional groups such as primary or secondary hydroxyl
groups. Conjugate groups of the invention include intercalators,
reporter molecules, polyamines, polyamides, polyethylene glycols,
polyethers, groups that enhance the pharmacodynamic properties of
oligomers, and groups that enhance the pharmacokinetic properties
of oligomers. Typical conjugate groups include cholesterols,
lipids, phospholipids, biotin, phenazine, folate, phenanthridine,
anthraquinone, acridine, fluoresceins, rhodamines, coumarins, and
dyes. Groups that enhance the pharmacodynamic properties, in the
context of this invention, include groups that improve oligomer
uptake, enhance oligomer resistance to degradation, and/or
strengthen sequence-specific hybridization with RNA. Groups that
enhance the pharmacokinetic properties, in the context of this
invention, include groups that improve oligomer uptake,
distribution, metabolism or excretion. Representative conjugate
groups are disclosed in International Patent Application
PCT/US92/09196, filed Oct. 23, 1992 the entire disclosure of which
is incorporated herein by reference. Conjugate moieties include but
are not limited to lipid moieties such as a cholesterol moiety
(Letsinger et al., Proc. Natl. Acad. Sci. USA, 1989, 86,
6553-6556), cholic acid (Manoharan et al., Bioorg. Med. Chem. Let.,
1994, 4, 1053-1060), a thioether, e.g., hexyl-S-tritylthiol
(Manoharan et al., Ann. N.Y. Acad. Sci., 1992, 660, 306-309;
Manoharan et al., Bioorg. Med. Chem. Let., 1993, 3, 2765-2770), a
thiocholesterol (Oberhauser et al., Nucl. Acids Res., 1992, 20,
533-538), an aliphatic chain, e.g., dodecandiol or undecyl residues
(Saison-Behmoaras et al., EMBO J., 1991, 10, 1111-1118; Kabanov et
al., FEBS Lett., 1990, 259, 327-330; Svinarchuk et al., Biochimie,
1993, 75, 49-54), a phospholipid, e.g., dihexadecyl-rac-glycerol or
triethylammonium 1,2-di-O-hexadecyl-rac-glyce- ro-3-H-phosphonate
(Manoharan et al., Tetrahedron Lett., 1995, 36, 3651-3654; Shea et
al., Nucl. Acids Res., 1990, 18, 3777-3783), a polyamine or a
polyethylene glycol chain (Manoharan et al., Nucleosides &
Nucleotides, 1995, 14, 969-973), or adamantane acetic acid
(Manoharan et al., Tetrahedron Lett., 1995, 36, 3651-3654), a
palmityl moiety (Mishra et al., Biochim. Biophys. Acta, 1995, 1264,
229-237), or an octadecylamine or hexylaminocarbonyl-oxycholesterol
moiety (Crooke et al., J. Pharmacol. Exp. Ther., 1996, 277,
923-937). Oligonucleotides of the invention may also be conjugated
to active drug substances, for example, aspirin, warfarin,
phenylbutazone, ibuprofen, suprofen, fenbufen, ketoprofen,
(S)-(+)-pranoprofen, carprofen, dansylsarcosine,
2,3,5-triiodobenzoic acid, flufenamic acid, folinic acid, a
benzothiadiazide, chlorothiazide, a diazepine, indomethicin, a
barbiturate, a cephalosporin, a sulfa drug, an antidiabetic, an
antibacterial or an antibiotic. Oligonucleotide-drug conjugates and
their preparation are described in U.S. patent application Ser. No.
09/334,130 (filed Jun. 15, 1999) which is incorporated herein by
reference in its entirety.
[0053] Representative United States patents that teach the
preparation of such oligonucleotide conjugates include, but are not
limited to, U.S. Pat. Nos. 4,828,979; 4,948,882; 5,218,105;
5,525,465; 5,541,313; 5,545,730; 5,552,538; 5,578,717, 5,580,731;
5,580,731; 5,591,584; 5,109,124; 5,118,802; 5,138,045; 5,414,077;
5,486,603; 5,512,439; 5,578,718; 5,608,046; 4,587,044; 4,605,735;
4,667,025; 4,762,779; 4,789,737; 4,824,941; 4,835,263; 4,876,335;
4,904,582; 4,958,013; 5,082,830; 5,112,963; 5,214,136; 5,082,830;
5,112,963; 5,214,136; 5,245,022; 5,254,469; 5,258,506; 5,262,536;
5,272,250; 5,292,873; 5,317,098; 5,371,241, 5,391,723; 5,416,203,
5,451,463; 5,510,475; 5,512,667; 5,514,785; 5,565,552; 5,567,810;
5,574,142; 5,585,481; 5,587,371; 5,595,726; 5,597,696; 5,599,923;
5,599,928 and 5,688,941, certain of which are commonly owned with
the instant application, and each of which is herein incorporated
by reference.
[0054] It is not necessary for all positions in a given compound to
be uniformly modified, and in fact more than one of the
aforementioned modifications may be incorporated in a single
compound or even at a single nucleoside within an oligonucleotide.
The present invention also includes antisense compounds which are
chimeric compounds. "Chimeric" antisense compounds or "chimeras,"
in the context of this invention, are antisense compounds,
particularly oligonucleotides, which contain two or more chemically
distinct regions, each made up of at least one monomer unit, i.e.,
a nucleotide in the case of an oligonucleotide compound. These
oligonucleotides typically contain at least one region wherein the
oligonucleotide is modified so as to confer upon the
oligonucleotide increased resistance to nuclease degradation,
increased cellular uptake, increased stability and/or increased
binding affinity for the target nucleic acid. An additional region
of the oligonucleotide may serve as a substrate for enzymes capable
of cleaving RNA:DNA or RNA:RNA hybrids. By way of example, RNAse H
is a cellular endonuclease which cleaves the RNA strand of an
RNA:DNA duplex. Activation of RNase H, therefore, results in
cleavage of the RNA target, thereby greatly enhancing the
efficiency of oligonucleotide inhibition of gene expression. The
cleavage of RNA:RNA hybrids can, in like fashion, be accomplished
through the actions of endoribonucleases, such as
interferon-induced RNAseL which cleaves both cellular and viral
RNA. Consequently, comparable results can often be obtained with
shorter oligonucleotides when chimeric oligonucleotides are used,
compared to phosphorothioate deoxyoligonucleotides hybridizing to
the same target region. Cleavage of the RNA target can be routinely
detected by gel electrophoresis and, if necessary, associated
nucleic acid hybridization techniques known in the art.
[0055] Chimeric antisense compounds of the invention may be formed
as composite structures of two or more oligonucleotides, modified
oligonucleotides, oligonucleosides and/or oligonucleotide mimetics
as described above. Such compounds have also been referred to in
the art as hybrids or gapmers. Representative United States patents
that teach the preparation of such hybrid structures include, but
are not limited to, U.S. Pat. Nos. 5,013,830; 5,149,797; 5,220,007;
5,256,775; 5,366,878; 5,403,711; 5,491,133; 5,565,350; 5,623,065;
5,652,355; 5,652,356; and 5,700,922, certain of which are commonly
owned with the instant application, and each of which is herein
incorporated by reference in its entirety.
[0056] The antisense compounds used in accordance with this
invention may be conveniently and routinely made through the
well-known technique of solid phase synthesis. Equipment for such
synthesis is sold by several vendors including, for example,
Applied Biosystems (Foster City, Calif.). Any other means for such
synthesis known in the art may additionally or alternatively be
employed. It is well known to use similar techniques to prepare
oligonucleotides such as the phosphorothioates and alkylated
derivatives.
[0057] The compounds of the invention may also be admixed,
encapsulated, conjugated or otherwise associated with other
molecules, molecule structures or mixtures of compounds, as for
example, liposomes, receptor-targeted molecules, oral, rectal,
topical or other formulations, for assisting in uptake,
distribution and/or absorption. Representative United States
patents that teach the preparation of such uptake, distribution
and/or absorption-assisting formulations include, but are not
limited to, U.S. Pat. Nos. 5,108,921; 5,354,844; 5,416,016;
5,459,127; 5,521,291; 5,543,158; 5,547,932; 5,583,020; 5,591,721;
4,426,330; 4,534,899; 5,013,556; 5,108,921; 5,213,804; 5,227,170;
5,264,221; 5,356,633; 5,395,619; 5,416,016; 5,417,978; 5,462,854;
5,469,854; 5,512,295; 5,527,528; 5,534,259; 5,543,152; 5,556,948;
5,580,575; and 5,595,756, each of which is herein incorporated by
reference.
[0058] The antisense compounds of the invention encompass any
pharmaceutically acceptable salts, esters, or salts of such esters,
or any other compound which, upon administration to an animal,
including a human, is capable of providing (directly or indirectly)
the biologically active metabolite or residue thereof. Accordingly,
for example, the disclosure is also drawn to prodrugs and
pharmaceutically acceptable salts of the compounds of the
invention, pharmaceutically acceptable salts of such prodrugs, and
other bioequivalents.
[0059] The term "prodrug" indicates a therapeutic agent that is
prepared in an inactive form that is converted to an active form
(i.e., drug) within the body or cells thereof by the action of
endogenous enzymes or other chemicals and/or conditions. In
particular, prodrug versions of the oligonucleotides of the
invention are prepared as SATE [(S-acetyl-2-thioethyl) phosphate]
derivatives according to the methods disclosed in WO 93/24510 to
Gosselin et al., published Dec. 9, 1993 or in WO 94/26764 and U.S.
Pat. No. 5,770,713 to Imbach et al.
[0060] The term "pharmaceutically acceptable salts" refers to
physiologically and pharmaceutically acceptable salts of the
compounds of the invention: i.e., salts that retain the desired
biological activity of the parent compound and do not impart
undesired toxicological effects thereto.
[0061] Pharmaceutically acceptable base addition salts are formed
with metals or amines, such as alkali and alkaline earth metals or
organic amines. Examples of metals used as cations are sodium,
potassium, magnesium, calcium, and the like. Examples of suitable
amines are N,N'-dibenzylethylenediamine, chloroprocaine, choline,
diethanolamine, dicyclohexylamine, ethylenediamine,
N-methylglucamine, and procaine (see, for example, Berge et al.,
"Pharmaceutical Salts," J. of Pharma Sci., 1977, 66, 1-19). The
base addition salts of said acidic compounds are prepared by
contacting the free acid form with a sufficient amount of the
desired base to produce the salt in the conventional manner. The
free acid form may be regenerated by contacting the salt form with
an acid and isolating the free acid in the conventional manner. The
free acid forms differ from their respective salt forms somewhat in
certain physical properties such as solubility in polar solvents,
but otherwise the salts are equivalent to their respective free
acid for purposes of the present invention. As used herein, a
"pharmaceutical addition salt" includes a pharmaceutically
acceptable salt of an acid form of one of the components of the
compositions of the invention. These include organic or inorganic
acid salts of the amines. Preferred acid salts are the
hydrochlorides, acetates, salicylates, nitrates and phosphates.
Other suitable pharmaceutically acceptable salts are well known to
those skilled in the art and include basic salts of a variety of
inorganic and organic acids, such as, for example, with inorganic
acids, such as for example hydrochloric acid, hydrobromic acid,
sulfuric acid or phosphoric acid; with organic carboxylic,
sulfonic, sulfo or phospho acids or N-substituted sulfamic acids,
for example acetic acid, propionic acid, glycolic acid, succinic
acid, maleic acid, hydroxymaleic acid, methylmaleic acid, fumaric
acid, malic acid, tartaric acid, lactic acid, oxalic acid, gluconic
acid, glucaric acid, glucuronic acid, citric acid, benzoic acid,
cinnamic acid, mandelic acid, salicylic acid, 4-aminosalicylic
acid, 2-phenoxybenzoic acid, 2-acetoxybenzoic acid, embonic acid,
nicotinic acid or isonicotinic acid; and with amino acids, such as
the 20 alpha-amino acids involved in the synthesis of proteins in
nature, for example glutamic acid or aspartic acid, and also with
phenylacetic acid, methanesulfonic acid, ethanesulfonic acid,
2-hydroxyethanesulfonic acid, ethane-1,2-disulfonic acid,
benzenesulfonic acid, 4-methylbenzenesulfonic acid,
naphthalene-2-sulfonic acid, naphthalene-1,5-disulfonic acid, 2- or
3-phosphoglycerate, glucose-6-phosphate, N-cyclohexylsulfamic acid
(with the formation of cyclamates), or with other acid organic
compounds, such as ascorbic acid. Pharmaceutically acceptable salts
of compounds may also be prepared with a pharmaceutically
acceptable cation. Suitable pharmaceutically acceptable cations are
well known to those skilled in the art and include alkaline,
alkaline earth, ammonium and quaternary ammonium cations.
Carbonates or hydrogen carbonates are also possible.
[0062] For oligonucleotides, preferred examples of pharmaceutically
acceptable salts include but are not limited to (a) salts formed
with cations such as sodium, potassium, ammonium, magnesium,
calcium, polyamines such as spermine and spermidine, etc.; (b) acid
addition salts formed with inorganic acids, for example
hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric
acid, nitric acid and the like; (c) salts formed with organic acids
such as, for example, acetic acid, oxalic acid, tartaric acid,
succinic acid, maleic acid, fumaric acid, gluconic acid, citric
acid, malic acid, ascorbic acid, benzoic acid, tannic acid,
palmitic acid, alginic acid, polyglutamic acid, naphthalenesulfonic
acid, methanesulfonic acid, p-toluenesulfonic acid,
naphthalenedisulfonic acid, polygalacturonic acid, and the like;
and (d) salts formed from elemental anions such as chlorine,
bromine, and iodine.
[0063] The antisense compounds of the present invention can be
utilized for diagnostics, therapeutics, prophylaxis and as research
reagents and kits. For therapeutics, an animal, preferably a human,
suspected of having a disease or disorder which can be treated by
modulating the expression of polo-like kinase is treated by
administering antisense compounds in accordance with this
invention. The compounds of the invention can be utilized in
pharmaceutical compositions by adding an effective amount of an
antisense compound to a suitable pharmaceutically acceptable
diluent or carrier. Use of the antisense compounds and methods of
the invention may also be useful prophylactically, e.g., to prevent
or delay infection, inflammation or tumor formation, for
example.
[0064] The antisense compounds of the invention are useful for
research and diagnostics, because these compounds hybridize to
nucleic acids encoding polo-like kinase, enabling sandwich and
other assays to easily be constructed to exploit this fact.
Hybridization of the antisense oligonucleotides of the invention
with a nucleic acid encoding polo-like kinase can be detected by
means known in the art. Such means may include conjugation of an
enzyme to the oligonucleotide, radiolabelling of the
oligonucleotide or any other suitable detection means. Kits using
such detection means for detecting the level of polo-like kinase in
a sample may also be prepared.
[0065] The present invention also includes pharmaceutical
compositions and formulations which include the antisense compounds
of the invention. The pharmaceutical compositions of the present
invention may be administered in a number of ways depending upon
whether local or systemic treatment is desired and upon the area to
be treated. Administration may be topical (including ophthalmic and
to mucous membranes including vaginal and rectal delivery),
pulmonary, e.g., by inhalation or insufflation of powders or
aerosols, including by nebulizer; intratracheal, intranasal,
epidermal and transdermal), oral or parenteral. Parenteral
administration includes intravenous, intraarterial, subcutaneous,
intraperitoneal or intramuscular injection or infusion; or
intracranial, e.g., intrathecal or intraventricular,
administration. Oligonucleotides with at least one
2'-O-methoxyethyl modification are believed to be particularly
useful for oral administration.
[0066] Pharmaceutical compositions and formulations for topical
administration may include transdermal patches, ointments, lotions,
creams, gels, drops, suppositories, sprays, liquids and powders.
Conventional pharmaceutical carriers, aqueous, powder or oily
bases, thickeners and the like may be necessary or desirable.
Coated condoms, gloves and the like may also be useful. Preferred
topical formulations include those in which the oligonucleotides of
the invention are in admixture with a topical delivery agent such
as lipids, liposomes, fatty acids, fatty acid esters, steroids,
chelating agents and surfactants. Preferred lipids and liposomes
include neutral (e.g. dioleoylphosphatidyl DOPE ethanolamine,
dimyristoylphosphatidyl choline DMPC, distearolyphosphatidyl
choline) negative (e.g. dimyristoylphosphatidyl glycerol DMPG) and
cationic (e.g. dioleoyltetramethylaminopropyl DOTAP and
dioleoylphosphatidyl ethanolamine DOTMA). Oligonucleotides of the
invention may be encapsulated within liposomes or may form
complexes thereto, in particular to cationic liposomes.
Alternatively, oligonucleotides may be complexed to lipids, in
particular to cationic lipids. Preferred fatty acids and esters
include but are not limited arachidonic acid, oleic acid,
eicosanoic acid, lauric acid, caprylic acid, capric acid, myristic
acid, palmitic acid, stearic acid, linoleic acid, linolenic acid,
dicaprate, tricaprate, monoolein, dilaurin, glyceryl 1-monocaprate,
1-dodecylazacycloheptan-2-one, an acylcarnitine, an acylcholine, or
a C.sub.1-10 alkyl ester (e.g. isopropylmyristate IPM),
monoglyceride, diglyceride or pharmaceutically acceptable salt
thereof. Topical formulations are described in detail in U.S.
patent application Ser. No. 09/315,298 filed on May 20, 1999 which
is incorporated herein by reference in its entirety.
[0067] Compositions and formulations for oral administration
include powders or granules, microparticulates, nanoparticulates,
suspensions or solutions in water or non-aqueous media, capsules,
gel capsules, sachets, tablets or minitablets. Thickeners,
flavoring agents, diluents, emulsifiers, dispersing aids or binders
may be desirable. Preferred oral formulations are those in which
oligonucleotides of the invention are administered in conjunction
with one or more penetration enhancers surfactants and chelators.
Preferred surfactants include fatty acids and/or esters or salts
thereof, bile acids and/or salts thereof. Preferred bile
acids/salts include chenodeoxycholic acid (CDCA) and
ursodeoxychenodeoxycholic acid (UDCA), cholic acid, dehydrocholic
acid, deoxycholic acid, glucholic acid, glycholic acid,
glycodeoxycholic acid, taurocholic acid, taurodeoxycholic acid,
sodium tauro-24,25-dihydro-fusid- ate and sodium
glycodihydrofusidate. Preferred fatty acids include arachidonic
acid, undecanoic acid, oleic acid, lauric acid, caprylic acid,
capric acid, myristic acid, palmitic acid, stearic acid, linoleic
acid, linolenic acid, dicaprate, tricaprate, monoolein, dilaurin,
glyceryl 1-monocaprate, 1-dodecylazacycloheptan-2-one, an
acylcarnitine, an acylcholine, or a monoglyceride, a diglyceride or
a pharmaceutically acceptable salt thereof (e.g. sodium). Also
preferred are combinations of penetration enhancers, for example,
fatty acids/salts in combination with bile acids/salts. A
particularly preferred combination is the sodium salt of lauric
acid, capric acid and UDCA. Further penetration enhancers include
polyoxyethylene-9-lauryl ether, polyoxyethylene-20-cetyl ether.
Oligonucleotides of the invention may be delivered orally, in
granular form including sprayed dried particles, or complexed to
form micro or nanoparticles. Oligonucleotide complexing agents
include poly-amino acids; polyimines; polyacrylates;
polyalkylacrylates, polyoxethanes, polyalkylcyanoacrylates;
cationized gelatins, albumins, starches, acrylates,
polyethyleneglycols (PEG) and starches; polyalkylcyanoacrylates;
DEAE-derivatized polyimines, pollulans, celluloses and starches.
Particularly preferred complexing agents include chitosan,
N-trimethylchitosan, poly-L-lysine, polyhistidine, polyornithine,
polyspermines, protamine, polyvinylpyridine,
polythiodiethylaminomethylethylene P(TDAE), polyaminostyrene (e.g.
p-amino), poly(methylcyanoacrylate), poly(ethylcyanoacrylate),
poly(butylcyanoacrylate), poly(isobutylcyanoacrylate),
poly(isohexylcynaoacrylate), DEAE-methacrylate, DEAE-hexylacrylate,
DEAE-acrylamide, DEAE-albumin and DEAE-dextran, polymethylacrylate,
polyhexylacrylate, poly(D,L-lactic acid),
poly(DL-lactic-co-glycolic acid (PLGA), alginate, and
polyethyleneglycol (PEG). Oral formulations for oligonucleotides
and their preparation are described in detail in U.S. application
Ser. No. 08/886,829 (filed Jul. 1, 1997), Ser. No. 09/108,673
(filed Jul. 1, 1998), Ser. No. 09/256,515 (filed Feb. 23, 1999),
Ser. No. 09/082,624 (filed May 21, 1998) and Ser. No. 09/315,298
(filed May 20, 1999), each of which is incorporated herein by
reference in their entirety.
[0068] Compositions and formulations for parenteral, intrathecal or
intraventricular administration may include sterile aqueous
solutions which may also contain buffers, diluents and other
suitable additives such as, but not limited to, penetration
enhancers, carrier compounds and other pharmaceutically acceptable
carriers or excipients.
[0069] Pharmaceutical compositions of the present invention
include, but are not limited to, solutions, emulsions, and
liposome-containing formulations. These compositions may be
generated from a variety of components that include, but are not
limited to, preformed liquids, self-emulsifying solids and
self-emulsifying semisolids.
[0070] The pharmaceutical formulations of the present invention,
which may conveniently be presented in unit dosage form, may be
prepared according to conventional techniques well known in the
pharmaceutical industry. Such techniques include the step of
bringing into association the active ingredients with the
pharmaceutical carrier(s) or excipient(s). In general, the
formulations are prepared by uniformly and intimately bringing into
association the active ingredients with liquid carriers or finely
divided solid carriers or both, and then, if necessary, shaping the
product.
[0071] The compositions of the present invention may be formulated
into any of many possible dosage forms such as, but not limited to,
tablets, capsules, gel capsules, liquid syrups, soft gels,
suppositories, and enemas. The compositions of the present
invention may also be formulated as suspensions in aqueous,
non-aqueous or mixed media. Aqueous suspensions may further contain
substances which increase the viscosity of the suspension
including, for example, sodium carboxymethylcellulose, sorbitol
and/or dextran. The suspension may also contain stabilizers.
[0072] In one embodiment of the present invention the
pharmaceutical compositions may be formulated and used as foams.
Pharmaceutical foams include formulations such as, but not limited
to, emulsions, microemulsions, creams, jellies and liposomes. While
basically similar in nature these formulations vary in the
components and the consistency of the final product. The
preparation of such compositions and formulations is generally
known to those skilled in the pharmaceutical and formulation arts
and may be applied to the formulation of the compositions of the
present invention.
[0073] Emulsions
[0074] The compositions of the present invention may be prepared
and formulated as emulsions. Emulsions are typically heterogenous
systems of one liquid dispersed in another in the form of droplets
usually exceeding 0.1 .mu.m in diameter (Idson, in Pharmaceutical
Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel
Dekker, Inc., New York, N.Y., volume 1, p. 199; Rosoff, in
Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.),
1988, Marcel Dekker, Inc., New York, N.Y., Volume 1, p. 245; Block
in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker
(Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 2, p.
335; Higuchi et al., in Remington's Pharmaceutical Sciences, Mack
Publishing Co., Easton, Pa., 1985, p. 301). Emulsions are often
biphasic systems comprising two immiscible liquid phases intimately
mixed and dispersed with each other. In general, emulsions may be
of either the water-in-oil (w/o) or the oil-in-water (o/w) variety.
When an aqueous phase is finely divided into and dispersed as
minute droplets into a bulk oily phase, the resulting composition
is called a water-in-oil (w/o) emulsion. Alternatively, when an
oily phase is finely divided into and dispersed as minute droplets
into a bulk aqueous phase, the resulting composition is called an
oil-in-water (o/w) emulsion. Emulsions may contain additional
components in addition to the dispersed phases, and the active drug
which may be present as a solution in either the aqueous phase,
oily phase or itself as a separate phase. Pharmaceutical excipients
such as emulsifiers, stabilizers, dyes, and anti-oxidants may also
be present in emulsions as needed. Pharmaceutical emulsions may
also be multiple emulsions that are comprised of more than two
phases such as, for example, in the case of oil-in-water-in-oil
(o/w/o) and water-in-oil-in-water (w/o/w) emulsions. Such complex
formulations often provide certain advantages that simple binary
emulsions do not. Multiple emulsions in which individual oil
droplets of an o/w emulsion enclose small water droplets constitute
a w/o/w emulsion. Likewise a system of oil droplets enclosed in
globules of water stabilized in an oily continuous phase provides
an o/w/o emulsion.
[0075] Emulsions are characterized by little or no thermodynamic
stability. Often, the dispersed or discontinuous phase of the
emulsion is well dispersed into the external or continuous phase
and maintained in this form through the means of emulsifiers or the
viscosity of the formulation. Either of the phases of the emulsion
may be a semisolid or a solid, as is the case of emulsion-style
ointment bases and creams. Other means of stabilizing emulsions
entail the use of emulsifiers that may be incorporated into either
phase of the emulsion. Emulsifiers may broadly be classified into
four categories: synthetic surfactants, naturally occurring
emulsifiers, absorption bases, and finely dispersed solids (Idson,
in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker
(Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p.
199).
[0076] Synthetic surfactants, also known as surface active agents,
have found wide applicability in the formulation of emulsions and
have been reviewed in the literature (Rieger, in Pharmaceutical
Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel
Dekker, Inc., New York, N.Y., volume 1, p. 285; Idson, in
Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.),
Marcel Dekker, Inc., New York, N.Y., 1988, volume 1, p. 199).
Surfactants are typically amphiphilic and comprise a hydrophilic
and a hydrophobic portion. The ratio of the hydrophilic to the
hydrophobic nature of the surfactant has been termed the
hydrophile/lipophile balance (HLB) and is a valuable tool in
categorizing and selecting surfactants in the preparation of
formulations. Surfactants may be classified into different classes
based on the nature of the hydrophilic group: nonionic, anionic,
cationic and amphoteric (Rieger, in Pharmaceutical Dosage Forms,
Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New
York, N.Y., volume 1, p. 285).
[0077] Naturally occurring emulsifiers used in emulsion
formulations include lanolin, beeswax, phosphatides, lecithin and
acacia. Absorption bases possess hydrophilic properties such that
they can soak up water to form w/o emulsions yet retain their
semisolid consistencies, such as anhydrous lanolin and hydrophilic
petrolatum. Finely divided solids have also been used as good
emulsifiers especially in combination with surfactants and in
viscous preparations. These include polar inorganic solids, such as
heavy metal hydroxides, nonswelling clays such as bentonite,
attapulgite, hectorite, kaolin, montmorillonite, colloidal aluminum
silicate and colloidal magnesium aluminum silicate, pigments and
nonpolar solids such as carbon or glyceryl tristearate.
[0078] A large variety of non-emulsifying materials are also
included in emulsion formulations and contribute to the properties
of emulsions. These include fats, oils, waxes, fatty acids, fatty
alcohols, fatty esters, humectants, hydrophilic colloids,
preservatives and antioxidants (Block, in Pharmaceutical Dosage
Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker,
Inc., New York, N.Y., volume 1, p. 335; Idson, in Pharmaceutical
Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel
Dekker, Inc., New York, N.Y., volume 1, p. 199).
[0079] Hydrophilic colloids or hydrocolloids include naturally
occurring gums and synthetic polymers such as polysaccharides (for
example, acacia, agar, alginic acid, carrageenan, guar gum, karaya
gum, and tragacanth), cellulose derivatives (for example,
carboxymethylcellulose and carboxypropylcellulose), and synthetic
polymers (for example, carbomers, cellulose ethers, and
carboxyvinyl polymers). These disperse or swell in water to form
colloidal solutions that stabilize emulsions by forming strong
interfacial films around the dispersed-phase droplets and by
increasing the viscosity of the external phase.
[0080] Since emulsions often contain a number of ingredients such
as carbohydrates, proteins, sterols and phosphatides that may
readily support the growth of microbes, these formulations often
incorporate preservatives. Commonly used preservatives included in
emulsion formulations include methyl paraben, propyl paraben,
quaternary ammonium salts, benzalkonium chloride, esters of
p-hydroxybenzoic acid, and boric acid. Antioxidants are also
commonly added to emulsion formulations to prevent deterioration of
the formulation. Antioxidants used may be free radical scavengers
such as tocopherols, alkyl gallates, butylated hydroxyanisole,
butylated hydroxytoluene, or reducing agents such as ascorbic acid
and sodium metabisulfite, and antioxidant synergists such as citric
acid, tartaric acid, and lecithin.
[0081] The application of emulsion formulations via dermatological,
oral and parenteral routes and methods for their manufacture have
been reviewed in the literature (Idson, in Pharmaceutical Dosage
Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker,
Inc., New York, N.Y., volume 1, p. 199). Emulsion formulations for
oral delivery have been very widely used because of ease of
formulation, as well as efficacy from an absorption and
bioavailability standpoint (Rosoff, in Pharmaceutical Dosage Forms,
Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New
York, N.Y., volume 1, p. 245; Idson, in Pharmaceutical Dosage
Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker,
Inc., New York, N.Y., volume 1, p. 199). Mineral-oil base
laxatives, oil-soluble vitamins and high fat nutritive preparations
are among the materials that have commonly been administered orally
as o/w emulsions.
[0082] In one embodiment of the present invention, the compositions
of oligonucleotides and nucleic acids are formulated as
microemulsions. A microemulsion may be defined as a system of
water, oil and amphiphile which is a single optically isotropic and
thermodynamically stable liquid solution (Rosoff, in Pharmaceutical
Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel
Dekker, Inc., New York, N.Y., volume 1, p. 245). Typically
microemulsions are systems that are prepared by first dispersing an
oil in an aqueous surfactant solution and then adding a sufficient
amount of a fourth component, generally an intermediate
chain-length alcohol to form a transparent system. Therefore,
microemulsions have also been described as thermodynamically
stable, isotropically clear dispersions of two immiscible liquids
that are stabilized by interfacial films of surface-active
molecules (Leung and Shah, in: Controlled Release of Drugs:
Polymers and Aggregate Systems, Rosoff, M., Ed., 1989, VCH
Publishers, New York, pages 185-215). Microemulsions commonly are
prepared via a combination of three to five components that include
oil, water, surfactant, cosurfactant and electrolyte. Whether the
microemulsion is of the water-in-oil (w/o) or an oil-in-water (o/w)
type is dependent on the properties of the oil and surfactant used
and on the structure and geometric packing of the polar heads and
hydrocarbon tails of the surfactant molecules (Schott, in
Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton,
Pa., 1985, p. 271).
[0083] The phenomenological approach utilizing phase diagrams has
been extensively studied and has yielded a comprehensive knowledge,
to one skilled in the art, of how to formulate microemulsions
(Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and
Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1,
p. 245; Block, in Pharmaceutical Dosage Forms, Lieberman, Rieger
and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y.,
volume 1, p. 335). Compared to conventional emulsions,
microemulsions offer the advantage of solubilizing water-insoluble
drugs in a formulation of thermodynamically stable droplets that
are formed spontaneously.
[0084] Surfactants used in the preparation of microemulsions
include, but are not limited to, ionic surfactants, non-ionic
surfactants, Brij 96, polyoxyethylene oleyl ethers, polyglycerol
fatty acid esters, tetraglycerol monolaurate (ML310), tetraglycerol
monooleate (MO310), hexaglycerol monooleate (PO310), hexaglycerol
pentaoleate (PO500), decaglycerol monocaprate (MCA750),
decaglycerol monooleate (MO750), decaglycerol sequioleate (SO750),
decaglycerol decaoleate (DAO750), alone or in combination with
cosurfactants. The cosurfactant, usually a short-chain alcohol such
as ethanol, 1-propanol, and 1-butanol, serves to increase the
interfacial fluidity by penetrating into the surfactant film and
consequently creating a disordered film because of the void space
generated among surfactant molecules. Microemulsions may, however,
be prepared without the use of cosurfactants and alcohol-free
self-emulsifying microemulsion systems are known in the art. The
aqueous phase may typically be, but is not limited to, water, an
aqueous solution of the drug, glycerol, PEG300, PEG400,
polyglycerols, propylene glycols, and derivatives of ethylene
glycol. The oil phase may include, but is not limited to, materials
such as Captex 300, Captex 355, Capmul MCM, fatty acid esters,
medium chain (C8-C12) mono, di, and tri-glycerides,
polyoxyethylated glyceryl fatty acid esters, fatty alcohols,
polyglycolized glycerides, saturated polyglycolized C8-C10
glycerides, vegetable oils and silicone oil.
[0085] Microemulsions are particularly of interest from the
standpoint of drug solubilization and the enhanced absorption of
drugs. Lipid based microemulsions (both o/w and w/o) have been
proposed to enhance the oral bioavailability of drugs, including
peptides (Constantinides et al., Pharmaceutical Research, 1994, 11,
1385-1390; Ritschel, Meth. Find. Exp. Clin. Pharmacol., 1993, 13,
205). Microemulsions afford advantages of improved drug
solubilization, protection of drug from enzymatic hydrolysis,
possible enhancement of drug absorption due to surfactant-induced
alterations in membrane fluidity and permeability, ease of
preparation, ease of oral administration over solid dosage forms,
improved clinical potency, and decreased toxicity (Constantinides
et al., Pharmaceutical Research, 1994, 11, 1385; Ho et al., J.
Pharm. Sci., 1996, 85, 138-143). Often microemulsions may form
spontaneously when their components are brought together at ambient
temperature. This may be particularly advantageous when formulating
thermolabile drugs, peptides or oligonucleotides. Microemulsions
have also been effective in the transdermal delivery of active
components in both cosmetic and pharmaceutical applications. It is
expected that the microemulsion compositions and formulations of
the present invention will facilitate the increased systemic
absorption of oligonucleotides and nucleic acids from the
gastrointestinal tract, as well as improve the local cellular
uptake of oligonucleotides and nucleic acids within the
gastrointestinal tract, vagina, buccal cavity and other areas of
administration.
[0086] Microemulsions of the present invention may also contain
additional components and additives such as sorbitan monostearate
(Grill 3), Labrasol, and penetration enhancers to improve the
properties of the formulation and to enhance the absorption of the
oligonucleotides and nucleic acids of the present invention.
Penetration enhancers used in the microemulsions of the present
invention may be classified as belonging to one of five broad
categories--surfactants, fatty acids, bile salts, chelating agents,
and non-chelating non-surfactants (Lee et al., Critical Reviews in
Therapeutic Drug Carrier Systems, 1991, p. 92). Each of these
classes has been discussed above.
[0087] Liposomes
[0088] There are many organized surfactant structures besides
microemulsions that have been studied and used for the formulation
of drugs. These include monolayers, micelles, bilayers and
vesicles. Vesicles, such as liposomes, have attracted great
interest because of their specificity and the duration of action
they offer from the standpoint of drug delivery. As used in the
present invention, the term "liposome" means a vesicle composed of
amphiphilic lipids arranged in a spherical bilayer or bilayers.
[0089] Liposomes are unilamellar or multilamellar vesicles which
have a membrane formed from a lipophilic material and an aqueous
interior. The aqueous portion contains the composition to be
delivered. Cationic liposomes possess the advantage of being able
to fuse to the cell wall. Non-cationic liposomes, although not able
to fuse as efficiently with the cell wall, are taken up by
macrophages in vivo.
[0090] In order to cross intact mammalian skin, lipid vesicles must
pass through a series of fine pores, each with a diameter less than
50 nm, under the influence of a suitable transdermal gradient.
Therefore, it is desirable to use a liposome which is highly
deformable and able to pass through such fine pores.
[0091] Further advantages of liposomes include; liposomes obtained
from natural phospholipids are biocompatible and biodegradable;
liposomes can incorporate a wide range of water and lipid soluble
drugs; liposomes can protect encapsulated drugs in their internal
compartments from metabolism and degradation (Rosoff, in
Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.),
1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245).
Important considerations in the preparation of liposome
formulations are the lipid surface charge, vesicle size and the
aqueous volume of the liposomes.
[0092] Liposomes are useful for the transfer and delivery of active
ingredients to the site of action. Because the liposomal membrane
is structurally similar to biological membranes, when liposomes are
applied to a tissue, the liposomes start to merge with the cellular
membranes and as the merging of the liposome and cell progresses,
the liposomal contents are emptied into the cell where the active
agent may act.
[0093] Liposomal formulations have been the focus of extensive
investigation as the mode of delivery for many drugs. There is
growing evidence that for topical administration, liposomes present
several advantages over other formulations. Such advantages include
reduced side-effects related to high systemic absorption of the
administered drug, increased accumulation of the administered drug
at the desired target, and the ability to administer a wide variety
of drugs, both hydrophilic and hydrophobic, into the skin.
[0094] Several reports have detailed the ability of liposomes to
deliver agents including high-molecular weight DNA into the skin.
Compounds including analgesics, antibodies, hormones and
high-molecular weight DNAs have been administered to the skin. The
majority of applications resulted in the targeting of the upper
epidermis.
[0095] Liposomes fall into two broad classes. Cationic liposomes
are positively charged liposomes which interact with the negatively
charged DNA molecules to form a stable complex. The positively
charged DNA/liposome complex binds to the negatively charged cell
surface and is internalized in an endosome. Due to the acidic pH
within the endosome, the liposomes are ruptured, releasing their
contents into the cell cytoplasm (Wang et al., Biochem. Biophys.
Res. Commun., 1987, 147, 980-985).
[0096] Liposomes which are pH-sensitive or negatively-charged,
entrap DNA rather than complex with it. Since both the DNA and the
lipid are similarly charged, repulsion rather than complex
formation occurs. Nevertheless, some DNA is entrapped within the
aqueous interior of these liposomes. pH-sensitive liposomes have
been used to deliver DNA encoding the thymidine kinase gene to cell
monolayers in culture. Expression of the exogenous gene was
detected in the target cells (Zhou et al., Journal of Controlled
Release, 1992, 19, 269-274).
[0097] One major type of liposomal composition includes
phospholipids other than naturally-derived phosphatidylcholine.
Neutral liposome compositions, for example, can be formed from
dimyristoyl phosphatidylcholine (DMPC) or dipalmitoyl
phosphatidylcholine (DPPC). Anionic liposome compositions generally
are formed from dimyristoyl phosphatidylglycerol, while anionic
fusogenic liposomes are formed primarily from dioleoyl
phosphatidylethanolamine (DOPE). Another type of liposomal
composition is formed from phosphatidylcholine (PC) such as, for
example, soybean PC, and egg PC. Another type is formed from
mixtures of phospholipid and/or phosphatidylcholine and/or
cholesterol.
[0098] Several studies have assessed the topical delivery of
liposomal drug formulations to the skin. Application of liposomes
containing interferon to guinea pig skin resulted in a reduction of
skin herpes sores while delivery of interferon via other means
(e.g. as a solution or as an emulsion) were ineffective (Weiner et
al., Journal of Drug Targeting, 1992, 2, 405-410). Further, an
additional study tested the efficacy of interferon administered as
part of a liposomal formulation to the administration of interferon
using an aqueous system, and concluded that the liposomal
formulation was superior to aqueous administration (du Plessis et
al., Antiviral Research, 1992, 18, 259-265).
[0099] Non-ionic liposomal systems have also been examined to
determine their utility in the delivery of drugs to the skin, in
particular systems comprising non-ionic surfactant and cholesterol.
Non-ionic liposomal formulations comprising Novasome.TM. (glyceryl
dilaurate/cholesterol/poly- oxyethylene-10-stearyl ether) and
Novasome.TM. II (glyceryl
distearate/cholesterol/polyoxyethylene-10-stearyl ether) were used
to deliver cyclosporin-A into the dermis of mouse skin. Results
indicated that such non-ionic liposomal systems were effective in
facilitating the deposition of cyclosporin-A into different layers
of the skin (Hu et al. S.T.P. Pharma. Sci., 1994, 4, 6, 466).
[0100] Liposomes also include "sterically stabilized" liposomes, a
term which, as used herein, refers to liposomes comprising one or
more specialized lipids that, when incorporated into liposomes,
result in enhanced circulation lifetimes relative to liposomes
lacking such specialized lipids. Examples of sterically stabilized
liposomes are those in which part of the vesicle-forming lipid
portion of the liposome (A) comprises one or more glycolipids, such
as monosialoganglioside G.sub.M1, or (B) is derivatized with one or
more hydrophilic polymers, such as a polyethylene glycol (PEG)
moiety. While not wishing to be bound by any particular theory, it
is thought in the art that, at least for sterically stabilized
liposomes containing gangliosides, sphingomyelin, or
PEG-derivatized lipids, the enhanced circulation half-life of these
sterically stabilized liposomes derives from a reduced uptake into
cells of the reticuloendothelial system (RES) (Allen et al., FEBS
Letters, 1987, 223, 42; Wu et al., Cancer Research, 1993, 53,
3765). Various liposomes comprising one or more glycolipids are
known in the art. Papahadjopoulos et al. (Ann. N.Y. Acad. Sci.,
1987, 507, 64) reported the ability of monosialoganglioside
G.sub.M1, galactocerebroside sulfate and phosphatidylinositol to
improve blood half-lives of liposomes. These findings were
expounded upon by Gabizon et al. (Proc. Natl. Acad. Sci. U.S.A.,
1988, 85, 6949). U.S. Pat. No. 4,837,028 and WO 88/04924, both to
Allen et al., disclose liposomes comprising (1) sphingomyelin and
(2) the ganglioside G.sub.M1 or a galactocerebroside sulfate ester.
U.S. Pat. No. 5,543,152 (Webb et al.) discloses liposomes
comprising sphingomyelin. Liposomes comprising
1,2-sn-dimyristoylphosphatidylcholine are disclosed in WO 97/13499
(Lim et al.).
[0101] Many liposomes comprising lipids derivatized with one or
more hydrophilic polymers, and methods of preparation thereof, are
known in the art. Sunamoto et al. (Bull. Chem. Soc. Jpn., 1980, 53,
2778) described liposomes comprising a nonionic detergent,
2C.sub.1215G, that contains a PEG moiety. Illum et al. (FEBS Lett.,
1984, 167, 79) noted that hydrophilic coating of polystyrene
particles with polymeric glycols results in significantly enhanced
blood half-lives. Synthetic phospholipids modified by the
attachment of carboxylic groups of polyalkylene glycols (e.g., PEG)
are described by Sears (U.S. Pat. Nos. 4,426,330 and 4,534,899).
Klibanov et al. (FEBS Lett., 1990, 268, 235) described experiments
demonstrating that liposomes comprising phosphatidylethanolamine
(PE) derivatized with PEG or PEG stearate have significant
increases in blood circulation half-lives. Blume et al. (Biochimica
et Biophysica Acta, 1990, 1029, 91) extended such observations to
other PEG-derivatized phospholipids, e.g., DSPE-PEG, formed from
the combination of distearoylphosphatidylethanolamine (DSPE) and
PEG. Liposomes having covalently bound PEG moieties on their
external surface are described in European Patent No. EP 0 445 131
B1 and WO 90/04384 to Fisher. Liposome compositions containing 1-20
mole percent of PE derivatized with PEG, and methods of use
thereof, are described by Woodle et al. (U.S. Pat. Nos. 5,013,556
and 5,356,633) and Martin et al. (U.S. Pat. No. 5,213,804 and
European Patent No. EP 0 496 813 B1). Liposomes comprising a number
of other lipid-polymer conjugates are disclosed in WO 91/05545 and
U.S. Pat. No. 5,225,212 (both to Martin et al.) and in WO 94/20073
(Zalipsky et al.) Liposomes comprising PEG-modified ceramide lipids
are described in WO 96/10391 (Choi et al.). U.S. Pat. No. 5,540,935
(Miyazaki et al.) and U.S. Pat. No. 5,556,948 (Tagawa et al.)
describe PEG-containing liposomes that can be further derivatized
with functional moieties on their surfaces.
[0102] A limited number of liposomes comprising nucleic acids are
known in the art. WO 96/40062 to Thierry et al. discloses methods
for encapsulating high molecular weight nucleic acids in liposomes.
U.S. Pat. No. 5,264,221 to Tagawa et al. discloses protein-bonded
liposomes and asserts that the contents of such liposomes may
include an antisense RNA. U.S. Pat. No. 5,665,710 to Rahman et al.
describes certain methods of encapsulating oligodeoxynucleotides in
liposomes. WO 97/04787 to Love et al. discloses liposomes
comprising antisense oligonucleotides targeted to the raf gene.
[0103] Transfersomes are yet another type of liposomes, and are
highly deformable lipid aggregates which are attractive candidates
for drug delivery vehicles. Transfersomes may be described as lipid
droplets which are so highly deformable that they are easily able
to penetrate through pores which are smaller than the droplet.
Transfersomes are adaptable to the environment in which they are
used, e.g. they are self-optimizing (adaptive to the shape of pores
in the skin), self-repairing, frequently reach their targets
without fragmenting, and often self-loading. To make transfersomes
it is possible to add surface edge-activators, usually surfactants,
to a standard liposomal composition. Transfersomes have been used
to deliver serum albumin to the skin. The transfersome-mediated
delivery of serum albumin has been shown to be as effective as
subcutaneous injection of a solution containing serum albumin.
[0104] Surfactants find wide application in formulations such as
emulsions (including microemulsions) and liposomes. The most common
way of classifying and ranking the properties of the many different
types of surfactants, both natural and synthetic, is by the use of
the hydrophile/lipophile balance (HLB). The nature of the
hydrophilic group (also known as the "head") provides the most
useful means for categorizing the different surfactants used in
formulations (Rieger, in Pharmaceutical Dosage Forms, Marcel
Dekker, Inc., New York, N.Y., 1988, p. 285).
[0105] If the surfactant molecule is not ionized, it is classified
as a nonionic surfactant. Nonionic surfactants find wide
application in pharmaceutical and cosmetic products and are usable
over a wide range of pH values. In general their HLB values range
from 2 to about 18 depending on their structure. Nonionic
surfactants include nonionic esters such as ethylene glycol esters,
propylene glycol esters, glyceryl esters, polyglyceryl esters,
sorbitan esters, sucrose esters, and ethoxylated esters. Nonionic
alkanolamides and ethers such as fatty alcohol ethoxylates,
propoxylated alcohols, and ethoxylated/propoxylated block polymers
are also included in this class. The polyoxyethylene surfactants
are the most popular members of the nonionic surfactant class.
[0106] If the surfactant molecule carries a negative charge when it
is dissolved or dispersed in water, the surfactant is classified as
anionic. Anionic surfactants include carboxylates such as soaps,
acyl lactylates, acyl amides of amino acids, esters of sulfuric
acid such as alkyl sulfates and ethoxylated alkyl sulfates,
sulfonates such as alkyl benzene sulfonates, acyl isethionates,
acyl taurates and sulfosuccinates, and phosphates. The most
important members of the anionic surfactant class are the alkyl
sulfates and the soaps.
[0107] If the surfactant molecule carries a positive charge when it
is dissolved or dispersed in water, the surfactant is classified as
cationic. Cationic surfactants include quaternary ammonium salts
and ethoxylated amines. The quaternary ammonium salts are the most
used members of this class.
[0108] If the surfactant molecule has the ability to carry either a
positive or negative charge, the surfactant is classified as
amphoteric. Amphoteric surfactants include acrylic acid
derivatives, substituted alkylamides, N-alkylbetaines and
phosphatides.
[0109] The use of surfactants in drug products, formulations and in
emulsions has been reviewed (Rieger, in Pharmaceutical Dosage
Forms, Marcel Dekker, Inc., New York, N.Y., 1988, p. 285).
[0110] Penetration Enhancers
[0111] In one embodiment, the present invention employs various
penetration enhancers to effect the efficient delivery of nucleic
acids, particularly oligonucleotides, to the skin of animals. Most
drugs are present in solution in both ionized and nonionized forms.
However, usually only lipid soluble or lipophilic drugs readily
cross cell membranes. It has been discovered that even
non-lipophilic drugs may cross cell membranes if the membrane to be
crossed is treated with a penetration enhancer. In addition to
aiding the diffusion of non-lipophilic drugs across cell membranes,
penetration enhancers also enhance the permeability of lipophilic
drugs.
[0112] Penetration enhancers may be classified as belonging to one
of five broad categories, i.e., surfactants, fatty acids, bile
salts, chelating agents, and non-chelating non-surfactants (Lee et
al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p.
92). Each of the above mentioned classes of penetration enhancers
are described below in greater detail.
[0113] Surfactants: In connection with the present invention,
surfactants (or "surface-active agents") are chemical entities
which, when dissolved in an aqueous solution, reduce the surface
tension of the solution or the interfacial tension between the
aqueous solution and another liquid, with the result that
absorption of oligonucleotides through the mucosa is enhanced. In
addition to bile salts and fatty acids, these penetration enhancers
include, for example, sodium lauryl sulfate,
polyoxyethylene-9-lauryl ether and polyoxyethylene-20-cetyl ether)
(Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems,
1991, p. 92); and perfluorochemical emulsions, such as FC-43.
Takahashi et al., J. Pharm. Pharmacol., 1988, 40, 252).
[0114] Fatty acids: Various fatty acids and their derivatives which
act as penetration enhancers include, for example, oleic acid,
lauric acid, capric acid (n-decanoic acid), myristic acid, palmitic
acid, stearic acid, linoleic acid, linolenic acid, dicaprate,
tricaprate, monoolein (1-monooleoyl-rac-glycerol), dilaurin,
caprylic acid, arachidonic acid, glycerol 1-monocaprate,
1-dodecylazacycloheptan-2-one, acylcarnitines, acylcholines,
C.sub.1-10 alkyl esters thereof (e.g., methyl, isopropyl and
t-butyl), and mono- and di-glycerides thereof (i.e., oleate,
laurate, caprate, myristate, palmitate, stearate, linoleate, etc.)
(Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems,
1991, p. 92; Muranishi, Critical Reviews in Therapeutic Drug
Carrier Systems, 1990, 7, 1-33; El Hariri et al., J. Pharm.
Pharmacol., 1992, 44, 651-654).
[0115] Bile salts: The physiological role of bile includes the
facilitation of dispersion and absorption of lipids and fat-soluble
vitamins (Brunton, Chapter 38 in: Goodman & Gilman's The
Pharmacological Basis of Therapeutics, 9th Ed., Hardman et al.
Eds., McGraw-Hill, New York, 1996, pp. 934-935). Various natural
bile salts, and their synthetic derivatives, act as penetration
enhancers. Thus the term "bile salts" includes any of the naturally
occurring components of bile as well as any of their synthetic
derivatives. The bile salts of the invention include, for example,
cholic acid (or its pharmaceutically acceptable sodium salt, sodium
cholate), dehydrocholic acid (sodium dehydrocholate), deoxycholic
acid (sodium deoxycholate), glucholic acid (sodium glucholate),
glycholic acid (sodium glycocholate), glycodeoxycholic acid (sodium
glycodeoxycholate), taurocholic acid (sodium taurocholate),
taurodeoxycholic acid (sodium taurodeoxycholate), chenodeoxycholic
acid (sodium chenodeoxycholate), ursodeoxycholic acid (UDCA),
sodium tauro-24,25-dihydrofusidate (STDHF), sodium
glycodihydrofusidate and polyoxyethylene-9-lauryl ether (POE) (Lee
et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991,
page 92; Swinyard, Chapter 39 In: Remington's Pharmaceutical
Sciences, 18th Ed., Gennaro, ed., Mack Publishing Co., Easton, Pa.,
1990, pages 782-783; Muranishi, Critical Reviews in Therapeutic
Drug Carrier Systems, 1990, 7, 1-33; Yamamoto et al., J. Pharm.
Exp. Ther., 1992, 263, 25; Yamashita et al., J. Pharm. Sci., 1990,
79, 579-583).
[0116] Chelating Agents: Chelating agents, as used in connection
with the present invention, can be defined as compounds that remove
metallic ions from solution by forming complexes therewith, with
the result that absorption of oligonucleotides through the mucosa
is enhanced. With regards to their use as penetration enhancers in
the present invention, chelating agents have the added advantage of
also serving as DNase inhibitors, as most characterized DNA
nucleases require a divalent metal ion for catalysis and are thus
inhibited by chelating agents (Jarrett, J. Chromatogr., 1993, 618,
315-339). Chelating agents of the invention include but are not
limited to disodium ethylenediaminetetraacetate (EDTA), citric
acid, salicylates (e.g., sodium salicylate, 5-methoxysalicylate and
homovanilate), N-acyl derivatives of collagen, laureth-9 and
N-amino acyl derivatives of beta-diketones (enamines) (Lee et al.,
Critical Reviews in Therapeutic Drug Carrier Systems, 1991, page
92; Muranishi, Critical Reviews in Therapeutic Drug Carrier
Systems, 1990, 7, 1-33; Buur et al., J. Control Rel., 1990, 14,
43-51).
[0117] Non-chelating non-surfactants: As used herein, non-chelating
non-surfactant penetration enhancing compounds can be defined as
compounds that demonstrate insignificant activity as chelating
agents or as surfactants but that nonetheless enhance absorption of
oligonucleotides through the alimentary mucosa (Muranishi, Critical
Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33). This
class of penetration enhancers include, for example, unsaturated
cyclic ureas, 1-alkyl- and 1-alkenylazacycloalkanone derivatives
(Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems,
1991, page 92); and non-steroidal anti-inflammatory agents such as
diclofenac sodium, indomethacin and phenylbutazone (Yamashita et
al., J. Pharm. Pharmacol., 1987, 39, 621-626).
[0118] Agents that enhance uptake of oligonucleotides at the
cellular level may also be added to the pharmaceutical and other
compositions of the present invention. For example, cationic
lipids, such as lipofectin (Junichi et al, U.S. Pat. No.
5,705,188), cationic glycerol derivatives, and polycationic
molecules, such as polylysine (Lollo et al., PCT Application WO
97/30731), are also known to enhance the cellular uptake of
oligonucleotides.
[0119] Other agents may be utilized to enhance the penetration of
the administered nucleic acids, including glycols such as ethylene
glycol and propylene glycol, pyrrols such as 2-pyrrol, azones, and
terpenes such as limonene and menthone.
[0120] Carriers
[0121] Certain compositions of the present invention also
incorporate carrier compounds in the formulation. As used herein,
"carrier compound" or "carrier" can refer to a nucleic acid, or
analog thereof, which is inert (i.e., does not possess biological
activity per se) but is recognized as a nucleic acid by in vivo
processes that reduce the bioavailability of a nucleic acid having
biological activity by, for example, degrading the biologically
active nucleic acid or promoting its removal from circulation. The
coadministration of a nucleic acid and a carrier compound,
typically with an excess of the latter substance, can result in a
substantial reduction of the amount of nucleic acid recovered in
the liver, kidney or other extracirculatory reservoirs, presumably
due to competition between the carrier compound and the nucleic
acid for a common receptor. For example, the recovery of a
partially phosphorothioate oligonucleotide in hepatic tissue can be
reduced when it is coadministered with polyinosinic acid, dextran
sulfate, polycytidic acid or
4-acetamido-4'isothiocyano-stilbene-2,2'-disulfonic acid (Miyao et
al., Antisense Res. Dev., 1995, 5, 115-121; Takakura et al.,
Antisense & Nucl. Acid Drug Dev., 1996, 6, 177-183).
[0122] Excipients
[0123] In contrast to a carrier compound, a "pharmaceutical
carrier" or "excipient" is a pharmaceutically acceptable solvent,
suspending agent or any other pharmacologically inert vehicle for
delivering one or more nucleic acids to an animal. The excipient
may be liquid or solid and is selected, with the planned manner of
administration in mind, so as to provide for the desired bulk,
consistency, etc., when combined with a nucleic acid and the other
components of a given pharmaceutical composition. Typical
pharmaceutical carriers include, but are not limited to, binding
agents (e.g., pregelatinized maize starch, polyvinylpyrrolidone or
hydroxypropyl methylcellulose, etc.); fillers (e.g., lactose and
other sugars, microcrystalline cellulose, pectin, gelatin, calcium
sulfate, ethyl cellulose, polyacrylates or calcium hydrogen
phosphate, etc.); lubricants (e.g., magnesium stearate, talc,
silica, colloidal silicon dioxide, stearic acid, metallic
stearates, hydrogenated vegetable oils, corn starch, polyethylene
glycols, sodium benzoate, sodium acetate, etc.); disintegrants
(e.g., starch, sodium starch glycolate, etc.); and wetting agents
(e.g., sodium lauryl sulphate, etc.).
[0124] Pharmaceutically acceptable organic or inorganic excipient
suitable for non-parenteral administration which do not
deleteriously react with nucleic acids can also be used to
formulate the compositions of the present invention. Suitable
pharmaceutically acceptable carriers include, but are not limited
to, water, salt solutions, alcohols, polyethylene glycols, gelatin,
lactose, amylose, magnesium stearate, talc, silicic acid, viscous
paraffin, hydroxymethylcellulose, polyvinylpyrrolidone and the
like.
[0125] Formulations for topical administration of nucleic acids may
include sterile and non-sterile aqueous solutions, non-aqueous
solutions in common solvents such as alcohols, or solutions of the
nucleic acids in liquid or solid oil bases. The solutions may also
contain buffers, diluents and other suitable additives.
Pharmaceutically acceptable organic or inorganic excipients
suitable for non-parenteral administration which do not
deleteriously react with nucleic acids can be used.
[0126] Suitable pharmaceutically acceptable excipients include, but
are not limited to, water, salt solutions, alcohol, polyethylene
glycols, gelatin, lactose, amylose, magnesium stearate, talc,
silicic acid, viscous paraffin, hydroxymethylcellulose,
polyvinylpyrrolidone and the like.
[0127] Other Components
[0128] The compositions of the present invention may additionally
contain other adjunct components conventionally found in
pharmaceutical compositions, at their art-established usage levels.
Thus, for example, the compositions may contain additional,
compatible, pharmaceutically-active materials such as, for example,
antipruritics, astringents, local anesthetics or anti-inflammatory
agents, or may contain additional materials useful in physically
formulating various dosage forms of the compositions of the present
invention, such as dyes, flavoring agents, preservatives,
antioxidants, opacifiers, thickening agents and stabilizers.
However, such materials, when added, should not unduly interfere
with the biological activities of the components of the
compositions of the present invention. The formulations can be
sterilized and, if desired, mixed with auxiliary agents, e.g.,
lubricants, preservatives, stabilizers, wetting agents,
emulsifiers, salts for influencing osmotic pressure, buffers,
colorings, flavorings and/or aromatic substances and the like which
do not deleteriously interact with the nucleic acid(s) of the
formulation.
[0129] Aqueous suspensions may contain substances which increase
the viscosity of the suspension including, for example, sodium
carboxymethylcellulose, sorbitol and/or dextran. The suspension may
also contain stabilizers.
[0130] Certain embodiments of the invention provide pharmaceutical
compositions containing (a) one or more antisense compounds and (b)
one or more other chemotherapeutic agents which function by a
non-antisense mechanism. Examples of such chemotherapeutic agents
include but are not limited to daunorubicin, daunomycin,
dactinomycin, doxorubicin, epirubicin, idarubicin, esorubicin,
bleomycin, mafosfamide, ifosfamide, cytosine arabinoside,
bis-chloroethylnitrosurea, busulfan, mitomycin C, actinomycin D,
mithramycin, prednisone, hydroxyprogesterone, testosterone,
tamoxifen, dacarbazine, procarbazine, hexamethylmelamine,
pentamethylmelamine, mitoxantrone, amsacrine, chlorambucil,
methylcyclohexylnitrosurea, nitrogen mustards, melphalan,
cyclophosphamide, 6-mercaptopurine, 6-thioguanine, cytarabine,
5-azacytidine, hydroxyurea, deoxycoformycin,
4-hydroxyperoxycyclophosphor- amide, 5-fluorouracil (5-FU),
5-fluorodeoxyuridine (5-FUdR), methotrexate (MTX), colchicine,
taxol, vincristine, vinblastine, etoposide (VP-16), trimetrexate,
irinotecan, topotecan, gemcitabine, teniposide, cisplatin and
diethylstilbestrol (DES). See, generally, The Merck Manual of
Diagnosis and Therapy, 15th Ed. 1987, pp. 1206-1228, Berkow et al.,
eds., Rahway, N.J. When used with the compounds of the invention,
such chemotherapeutic agents may be used individually (e.g., 5-FU
and oligonucleotide), sequentially (e.g., 5-FU and oligonucleotide
for a period of time followed by MTX and oligonucleotide), or in
combination with one or more other such chemotherapeutic agents
(e.g., 5-FU, MTX and oligonucleotide, or 5-FU, radiotherapy and
oligonucleotide). Anti-inflammatory drugs, including but not
limited to nonsteroidal anti-inflammatory drugs and
corticosteroids, and antiviral drugs, including but not limited to
ribivirin, vidarabine, acyclovir and ganciclovir, may also be
combined in compositions of the invention. See, generally, The
Merck Manual of Diagnosis and Therapy, 15th Ed., Berkow et al.,
eds., 1987, Rahway, N.J., pages 2499-2506 and 46-49, respectively).
Other non-antisense chemotherapeutic agents are also within the
scope of this invention. Two or more combined compounds may be used
together or sequentially.
[0131] In another related embodiment, compositions of the invention
may contain one or more antisense compounds, particularly
oligonucleotides, targeted to a first nucleic acid and one or more
additional antisense compounds targeted to a second nucleic acid
target. Numerous examples of antisense compounds are known in the
art. Two or more combined compounds may be used together or
sequentially.
[0132] The formulation of therapeutic compositions and their
subsequent administration is believed to be within the skill of
those in the art. Dosing is dependent on severity and
responsiveness of the disease state to be treated, with the course
of treatment lasting from several days to several months, or until
a cure is effected or a diminution of the disease state is
achieved. Optimal dosing schedules can be calculated from
measurements of drug accumulation in the body of the patient.
Persons of ordinary skill can easily determine optimum dosages,
dosing methodologies and repetition rates. Optimum dosages may vary
depending on the relative potency of individual oligonucleotides,
and can generally be estimated based on EC.sub.50s found to be
effective in in vitro and in vivo animal models. In general, dosage
is from 0.01 ug to 100 g per kg of body weight, and may be given
once or more daily, weekly, monthly or yearly, or even once every 2
to 20 years. Persons of ordinary skill in the art can easily
estimate repetition rates for dosing based on measured residence
times and concentrations of the drug in bodily fluids or tissues.
Following successful treatment, it may be desirable to have the
patient undergo maintenance therapy to prevent the recurrence of
the disease state, wherein the oligonucleotide is administered in
maintenance doses, ranging from 0.01 ug to 100 g per kg of body
weight, once or more daily, to once every 20 years.
[0133] While the present invention has been described with
specificity in accordance with certain of its preferred
embodiments, the following examples serve only to illustrate the
invention and are not intended to limit the same.
EXAMPLES
Example 1
Nucleoside Phosphoramidites for Oligonucleotide Synthesis Deoxy and
2'-alkoxy amidites
[0134] 2'-Deoxy and 2'-methoxy beta-cyanoethyldiisopropyl
phosphoramidites were purchased from commercial sources (e.g.
Chemgenes, Needham Mass. or Glen Research, Inc. Sterling Va.).
Other 2'-O-alkoxy substituted nucleoside amidites are prepared as
described in U.S. Pat. No. 5,506,351, herein incorporated by
reference. For oligonucleotides synthesized using 2'-alkoxy
amidites, optimized synthesis cycles were developed that
incorporate multiple steps coupling longer wait times relative to
standard synthesis cycles.
[0135] The following abbreviations are used in the text: thin layer
chromatography (TLC), melting point (MP), high pressure liquid
chromatography (HPLC), Nuclear Magnetic Resonance (NMR), argon
(Ar), methanol (MeOH), dichloromethane (CH.sub.2Cl.sub.2),
triethylamine (TEA), dimethyl formamide (DMF), ethyl acetate
(EtOAc), dimethyl sulfoxide (DMSO), tetrahydrofuran (THF).
[0136] Oligonucleotides containing 5-methyl-2'-deoxycytidine
(5-Me-dC) nucleotides were synthesized according to published
methods (Sanghvi, et. al., Nucleic Acids Research, 1993, 21,
3197-3203) using commercially available phosphoramidites (Glen
Research, Sterling Va. or ChemGenes, Needham Mass.) or prepared as
follows:
Preparation of 5'-O-Dimethoxytrityl-thymidine intermediate for
5-methyl dC amidite
[0137] To a 50 L glass reactor equipped with air stirrer and Ar gas
line was added thymidine (1.00 kg, 4.13 mol) in anhydrous pyridine
(6 L) at ambient temperature. Dimethoxytrityl (DMT) chloride (1.47
kg, 4.34 mol, 1.05 eq) was added as a solid in four portions over 1
h. After 30 min, TLC indicated approx. 95% product, 2% thymidine,
5% DMT reagent and by-products and 2% 3',5'-bis DMT product
(R.sub.f in EtOAc 0.45, 0.05, 0.98, 0.95 respectively). Saturated
sodium bicarbonate (4 L) and CH.sub.2Cl.sub.2 were added with
stirring (pH of the aqueous layer 7.5). An additional 18 L of water
was added, the mixture was stirred, the phases were separated, and
the organic layer was transferred to a second 50 L vessel. The
aqueous layer was extracted with additional CH.sub.2Cl.sub.2
(2.times.2 L). The combined organic layer was washed with water (10
L) and then concentrated in a rotary evaporator to approx. 3.6 kg
total weight. This was redissolved in CH.sub.2Cl.sub.2 (3.5 L),
added to the reactor followed by water (6 L) and hexanes (13 L).
The mixture was vigorously stirred and seeded to give a fine white
suspended solid starting at the interface. After stirring for 1 h,
the suspension was removed by suction through a 1/2" diameter
teflon tube into a 20 L suction flask, poured onto a 25 cm Coors
Buchner funnel, washed with water (2.times.3 L) and a mixture of
hexanes--CH.sub.2Cl.sub.2 (4:1, 2.times.3 L) and allowed to air dry
overnight in pans (1" deep). This was further dried in a vacuum
oven (75.degree. C., 0.1 mm Hg, 48 h) to a constant weight of 2072
g (93%) of a white solid, (mp 122-124.degree. C.). TLC indicated a
trace contamination of the bis DMT product. NMR spectroscopy also
indicated that 1-2 mole percent pyridine and about 5 mole percent
of hexanes was still present.
Preparation of 5'-O-Dimethoxytrityl-2'-deoxy-5-methylcytidine
intermediate for 5-methyl-dC amidite
[0138] To a 50 L Schott glass-lined steel reactor equipped with an
electric stirrer, reagent addition pump (connected to an addition
funnel), heating/cooling system, internal thermometer and an Ar gas
line was added 5'-O-dimethoxytrityl-thymidine (3.00 kg, 5.51 mol),
anhydrous acetonitrile (25 L) and TEA (12.3 L, 88.4 mol, 16 eq).
The mixture was chilled with stirring to -10.degree. C. internal
temperature (external -20.degree. C.). Trimethylsilylchloride (2.1
L, 16.5 mol, 3.0 eq) was added over 30 minutes while maintaining
the internal temperature below -5.degree. C., followed by a wash of
anhydrous acetonitrile (1 L). Note: the reaction is mildly
exothermic and copious hydrochloric acid fumes form over the course
of the addition. The reaction was allowed to warm to 0.degree. C.
and the reaction progress was confirmed by TLC (EtOAc-hexanes 4:1;
R.sub.f 0.43 to 0.84 of starting material and silyl product,
respectively). Upon completion, triazole (3.05 kg, 44 mol, 8.0 eq)
was added the reaction was cooled to -20.degree. C. internal
temperature (external -30.degree. C.). Phosphorous oxychloride
(1035 mL, 11.1 mol, 2.01 eq) was added over 60 min so as to
maintain the temperature between -20.degree. C. and -10.degree. C.
during the strongly exothermic process, followed by a wash of
anhydrous acetonitrile (1 L). The reaction was warmed to 0.degree.
C. and stirred for 1 h. TLC indicated a complete conversion to the
triazole product (R.sub.f 0.83 to 0.34 with the product spot
glowing in long wavelength UV light). The reaction mixture was a
peach-colored thick suspension, which turned darker red upon
warming without apparent decomposition. The reaction was cooled to
-15.degree. C. internal temperature and water (5 L) was slowly
added at a rate to maintain the temperature below +10.degree. C. in
order to quench the reaction and to form a homogenous solution.
(Caution: this reaction is initially very strongly exothermic).
Approximately one-half of the reaction volume (22 L) was
transferred by air pump to another vessel, diluted with EtOAc (12
L) and extracted with water (2.times.8 L). The combined water
layers were back-extracted with EtOAc (6 L). The water layer was
discarded and the organic layers were concentrated in a 20 L rotary
evaporator to an oily foam. The foam was coevaporated with
anhydrous acetonitrile (4 L) to remove EtOAc. (note: dioxane may be
used instead of anhydrous acetonitrile if dried to a hard foam).
The second half of the reaction was treated in the same way. Each
residue was dissolved in dioxane (3 L) and concentrated ammonium
hydroxide (750 mL) was added. A homogenous solution formed in a few
minutes and the reaction was allowed to stand overnight (although
the reaction is complete within 1 h).
[0139] TLC indicated a complete reaction (product R.sub.f 0.35 in
EtOAc-MeOH 4:1). The reaction solution was concentrated on a rotary
evaporator to a dense foam. Each foam was slowly redissolved in
warm EtOAc (4 L; 50.degree. C.), combined in a 50 L glass reactor
vessel, and extracted with water (2.times.4L) to remove the
triazole by-product. The water was back-extracted with EtOAc (2 L).
The organic layers were combined and concentrated to about 8 kg
total weight, cooled to 0.degree. C. and seeded with crystalline
product. After 24 hours, the first crop was collected on a 25 cm
Coors Buchner funnel and washed repeatedly with EtOAc (3.times.3L)
until a white powder was left and then washed with ethyl ether
(2.times.3L). The solid was put in pans (1" deep) and allowed to
air dry overnight. The filtrate was concentrated to an oil, then
redissolved in EtOAc (2 L), cooled and seeded as before. The second
crop was collected and washed as before (with proportional
solvents) and the filtrate was first extracted with water
(2.times.1 L) and then concentrated to an oil. The residue was
dissolved in EtOAc (1 L) and yielded a third crop which was treated
as above except that more washing was required to remove a yellow
oily layer.
[0140] After air-drying, the three crops were dried in a vacuum
oven (50.degree. C., 0.1 mm Hg, 24 h) to a constant weight (1750,
600 and 200 g, respectively) and combined to afford 2550 g (85%) of
a white crystalline product (MP 215-217.degree. C.) when TLC and
NMR spectroscopy indicated purity. The mother liquor still
contained mostly product (as determined by TLC) and a small amount
of triazole (as determined by NMR spectroscopy), bis DMT product
and unidentified minor impurities. If desired, the mother liquor
can be purified by silica gel chromatography using a gradient of
MeOH (0-25%) in EtOAc to further increase the yield.
Preparation of
5'-O-Dimethoxytrityl-2'-deoxy-N4-benzoyl-5-methylcytidine
penultimate intermediate for 5-methyl dC amidite
[0141] Crystalline 5'-O-dimethoxytrityl-5-methyl-2'-deoxycytidine
(2000 g, 3.68 mol) was dissolved in anhydrous DMF (6.0 kg) at
ambient temperature in a 50 L glass reactor vessel equipped with an
air stirrer and argon line. Benzoic anhydride (Chem Impex not
Aldrich, 874 g, 3.86 mol, 1.05 eq) was added and the reaction was
stirred at ambient temperature for 8 h. TLC
(CH.sub.2Cl.sub.2-EtOAc; CH.sub.2Cl.sub.2-EtOAc 4:1; R.sub.f 0.25)
indicated approx. 92% complete reaction. An additional amount of
benzoic anhydride (44 g, 0.19 mol) was added. After a total of 18
h, TLC indicated approx. 96% reaction completion. The solution was
diluted with EtOAc (20 L), TEA (1020 mL, 7.36 mol, ca 2.0 eq) was
added with stirring, and the mixture was extracted with water (15
L, then 2.times.10 L). The aqueous layer was removed (no
back-extraction was needed) and the organic layer was concentrated
in 2.times.20 L rotary evaporator flasks until a foam began to
form. The residues were coevaporated with acetonitrile (1.5 L each)
and dried (0.1 mm Hg, 25.degree. C., 24 h) to 2520 g of a dense
foam. High pressure liquid chromatography (HPLC) revealed a
contamination of 6.3% of N4, 3'-O-dibenzoyl product, but very
little other impurities.
[0142] THe product was purified by Biotage column chromatography (5
kg Biotage) prepared with 65:35:1 hexanes-EtOAc-TEA (4L). The crude
product (800 g),dissolved in CH.sub.2Cl.sub.2 (2 L), was applied to
the column. The column was washed with the 65:35:1 solvent mixture
(20 kg), then 20:80:1 solvent mixture (10 kg), then 99:1 EtOAc:TEA
(17 kg). The fractions containing the product were collected, and
any fractions containing the product and impurities were retained
to be resubjected to column chromatography. The column was
re-equilibrated with the original 65:35:1 solvent mixture (17 kg).
A second batch of crude product (840 g) was applied to the column
as before. The column was washed with the following solvent
gradients: 65:35:1 (9 kg), 55:45:1 (20 kg), 20:80:1 (10 kg), and
99:1 EtOAc:TEA (15 kg). The column was reequilibrated as above, and
a third batch of the crude product (850 g) plus impure fractions
recycled from the two previous columns (28 g) was purified
following the procedure for the second batch. The fractions
containing pure product combined and concentrated on a 20 L rotary
evaporator, co-evaporated with acetontirile (3 L) and dried (0.1 mm
Hg, 48 h, 25.degree. C.) to a constant weight of 2023 g (85%) of
white foam and 20 g of slightly contaminated product from the third
run. HPLC indicated a purity of 99.8% with the balance as the
diBenzoyl product.
[5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-deoxy-N.sup.4-benzoyl-5-methylcyt-
idin-3'-O-yl]-2-cyanoethyl-N,N-diisopropylphosphoramidite (5-methyl
dC amidite)
[0143]
5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-deoxy-N.sup.4-benzoyl-5-met-
hylcytidine (998 g, 1.5 mol) was dissolved in anhydrous DMF (2 L).
The solution was co-evaporated with toluene (300 ml) at 50.degree.
C. under reduced pressure, then cooled to room temperature and
2-cyanoethyl tetraisopropylphosphorodiamidite (680 g, 2.26 mol) and
tetrazole (52.5 g, 0.75 mol) were added. The mixture was shaken
until all tetrazole was dissolved, N-methylimidazole (15 ml) was
added and the mixture was left at room temperature for 5 hours. TEA
(300 ml) was added, the mixture was diluted with DMF (2.5 L) and
water (600 ml), and extracted with hexane (3.times.3 L). The
mixture was diluted with water (1.2 L) and extracted with a mixture
of toluene (7.5 L) and hexane (6 L). The two layers were separated,
the upper layer was washed with DMF-water (7:3 v/v, 3.times.2 L)
and water (3.times.2 L), and the phases were separated. The organic
layer was dried (Na.sub.2SO.sub.4), filtered and rotary evaporated.
The residue was co-evaporated with acetonitrile (2.times.2 L) under
reduced pressure and dried to a constant weight (25.degree. C., 0.1
mm Hg, 40 h) to afford 1250 g an off-white foam solid (96%).
2'-Fluoro amidites
2'-Fluorodeoxyadenosine amidites
[0144] 2'-fluoro oligonucleotides were synthesized as described
previously [Kawasaki, et. al., J. Med. Chem., 1993, 36, 831-841]
and U.S. Pat. No. 5,670,633, herein incorporated by reference. The
preparation of 2'-fluoropyrimidines containing a 5-methyl
substitution are described in U.S. Pat. No. 5,861,493. Briefly, the
protected nucleoside N6-benzoyl-2'-deoxy-2'-fluoroadenosine was
synthesized utilizing commercially available
9-beta-D-arabinofuranosyladenine as starting material and whereby
the 2'-alpha-fluoro atom is introduced by a S.sub.N2-displacement
of a 2'-beta-triflate group. Thus
N6-benzoyl-9-beta-D-arabinofuranosyladenine was selectively
protected in moderate yield as the 3',5'-ditetrahydropyranyl (THP)
intermediate. Deprotection of the THP and N6-benzoyl groups was
accomplished using standard methodologies to obtain the
5'-dimethoxytrityl-(DMT) and 5'-DMT-3'-phosphoramidite
intermediates.
2'-Fluorodeoxyguanosine
[0145] The synthesis of 2'-deoxy-2'-fluoroguanosine was
accomplished using tetraisopropyldisiloxanyl (TPDS) protected
9-beta-D-arabinofuranosylguani- ne as starting material, and
conversion to the intermediate isobutyrylarabinofuranosylguanosine.
Alternatively, isobutyrylarabinofuranosylguanosine was prepared as
described by Ross et al., (Nucleosides & Nucleosides, 16, 1645,
1997). Deprotection of the TPDS group was followed by protection of
the hydroxyl group with THP to give isobutyryl di-THP protected
arabinofuranosylguanine. Selective O-deacylation and triflation was
followed by treatment of the crude product with fluoride, then
deprotection of the THP groups. Standard methodologies were used to
obtain the 5'-DMT- and 5'-DMT-3'-phosphoramidi- tes.
2'-Fluorouridine
[0146] Synthesis of 2'-deoxy-2'-fluorouridine was accomplished by
the modification of a literature procedure in which
2,2'-anhydro-1-beta-D-ara- binofuranosyluracil was treated with 70%
hydrogen fluoride-pyridine. Standard procedures were used to obtain
the 5'-DMT and 5'-DMT-3'phosphoramidites.
2'-Fluorodeoxycytidine
[0147] 2'-deoxy-2'-fluorocytidine was synthesized via amination of
2'-deoxy-2'-fluorouridine, followed by selective protection to give
N4-benzoyl-2'-deoxy-2'-fluorocytidine. Standard procedures were
used to obtain the 5'-DMT and 5'-DMT-3'phosphoramidites.
2'-O-(2-Methoxyethyl) modified amidites
[0148] 2'-O-Methoxyethyl-substituted nucleoside amidites (otherwise
known as MOE amidites) are prepared as follows, or alternatively,
as per the methods of Martin, P., (Helvetica Chimica Acta, 1995,
78, 486-504).
Preparation of 2'-O-(2-methoxyethyl)-5-methyluridine
intermediate
[0149] 2,2'-Anhydro-5-methyl-uridine (2000 g, 8.32 mol),
tris(2-methoxyethyl)borate (2504 g, 10.60 mol), sodium bicarbonate
(60 g, 0.70 mol) and anhydrous 2-methoxyethanol (5 L) were combined
in a 12 L three necked flask and heated to 130.degree. C. (internal
temp) at atmospheric pressure, under an argon atmosphere with
stirring for 21 h. TLC indicated a complete reaction. The solvent
was removed under reduced pressure until a sticky gum formed
(50-85.degree. C. bath temp and 100-11 mm Hg) and the residue was
redissolved in water (3 L) and heated to boiling for 30 min in
order the hydrolyze the borate esters. The water was removed under
reduced pressure until a foam began to form and then the process
was repeated. HPLC indicated about 77% product, 15% dimer (51 of
product attached to 21 of starting material) and unknown
derivatives, and the balance was a single unresolved early eluting
peak.
[0150] The gum was redissolved in brine (3 L), and the flask was
rinsed with additional brine (3 L). The combined aqueous solutions
were extracted with chloroform (20 L) in a heavier-than continuous
extractor for 70 h. The chloroform layer was concentrated by rotary
evaporation in a 20 L flask to a sticky foam (2400 g). This was
coevaporated with MeOH (400 mL) and EtOAc (8 L) at 75.degree. C.
and 0.65 atm until the foam dissolved at which point the vacuum was
lowered to about 0.5 atm. After 2.5 L of distillate was collected a
precipitate began to form and the flask was removed from the rotary
evaporator and stirred until the suspension reached ambient
temperature. EtOAc (2 L) was added and the slurry was filtered on a
25 cm table top Buchner funnel and the product was washed with
EtOAc (3.times.2 L). The bright white solid was air dried in pans
for 24 h then further dried in a vacuum oven (50.degree. C., 0.1 mm
Hg, 24 h) to afford 1649 g of a white crystalline solid (mp
115.5-116.5.degree. C.).
[0151] The brine layer in the 20 L continuous extractor was further
extracted for 72 h with recycled chloroform. The chloroform was
concentrated to 120 g of oil and this was combined with the mother
liquor from the above filtration (225 g), dissolved in brine (250
mL) and extracted once with chloroform (250 mL). The brine solution
was continuously extracted and the product was crystallized as
described above to afford an additional 178 g of crystalline
product containing about 2% of thymine. The combined yield was 1827
g (69.4%). HPLC indicated about 99.5% purity with the balance being
the dimer.
Preparation of 5'-O-DMT-2'-O-(2-methoxyethyl)-5-methyluridine
penultimate intermediate
[0152] In a 50 L glass-lined steel reactor,
2'-O-(2-methoxyethyl)-5-methyl- -uridine (MOE-T, 1500 g, 4.738
mol), lutidine (1015 g, 9.476 mol) were dissolved in anhydrous
acetonitrile (15 L). The solution was stirred rapidly and chilled
to -10.degree. C. (internal temperature). Dimethoxytriphenylmethyl
chloride (1765.7 g, 5.21 mol) was added as a solid in one portion.
The reaction was allowed to warm to -2.degree. C. over 1 h. (Note:
The reaction was monitored closely by TLC (EtOAc) to determine when
to stop the reaction so as to not generate the undesired bis-DMT
substituted side product). The reaction was allowed to warm from -2
to 3.degree. C. over 25 min. then quenched by adding MeOH (300 mL)
followed after 10 min by toluene (16 L) and water (16 L). The
solution was transferred to a clear 50 L vessel with a bottom
outlet, vigorously stirred for 1 minute, and the layers separated.
The aqueous layer was removed and the organic layer was washed
successively with 10% aqueous citric acid (8 L) and water (12 L).
The product was then extracted into the aqueous phase by washing
the toluene solution with aqueous sodium hydroxide (0.5N, 16 L and
8 L). The combined aqueous layer was overlayed with toluene (12 L)
and solid citric acid (8 moles, 1270 g) was added with vigorous
stirring to lower the pH of the aqueous layer to 5.5 and extract
the product into the toluene. The organic layer was washed with
water (10 L) and TLC of the organic layer indicated a trace of
DMT-O-Me, bis DMT and dimer DMT.
[0153] The toluene solution was applied to a silica gel column (6 L
sintered glass funnel containing approx. 2 kg of silica gel
slurried with toluene (2 L) and TEA(25 mL)) and the fractions were
eluted with toluene (12 L) and EtOAc (3.times.4 L) using vacuum
applied to a filter flask placed below the column. The first EtOAc
fraction containing both the desired product and impurities were
resubjected to column chromatography as above. The clean fractions
were combined, rotary evaporated to a foam, coevaporated with
acetonitrile (6 L) and dried in a vacuum oven (0.1 mm Hg, 40 h,
40.degree. C.) to afford 2850 g of a white crisp foam. NMR
spectroscopy indicated a 0.25 mole % remainder of acetonitrile
(calculates to be approx. 47 g) to give a true dry weight of 2803 g
(96%). HPLC indicated that the product was 99.41% pure, with the
remainder being 0.06 DMT-O--Me, 0.10 unknown, 0.44 bis DMT, and no
detectable dimer DMT or 3'-O-DMT.
Preparation of
[5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)-
-5-methyluridin-3'-O-yl]-2-cyanoethyl-N,N-diisopropylphosphoramidite
(MOE T amidite)
[0154]
5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)-5-methyl-
uridine (1237 g, 2.0 mol) was dissolved in anhydrous DMF (2.5 L).
The solution was co-evaporated with toluene (200 ml) at 50.degree.
C. under reduced pressure, then cooled to room temperature and
2-cyanoethyl tetraisopropylphosphorodiamidite (900 g, 3.0 mol) and
tetrazole (70 g, 1.0 mol) were added. The mixture was shaken until
all tetrazole was dissolved, N-methylimidazole (20 ml) was added
and the solution was left at room temperature for 5 hours. TEA (300
ml) was added, the mixture was diluted with DMF (3.5 L) and water
(600 ml) and extracted with hexane (3.times.3L). The mixture was
diluted with water (1.6 L) and extracted with the mixture of
toluene (12 L) and hexanes (9 L). The upper layer was washed with
DMF-water (7:3 v/v, 3.times.3 L) and water (3.times.3 L). The
organic layer was dried (Na.sub.2SO.sub.4), filtered and
evaporated. The residue was co-evaporated with acetonitrile
(2.times.2 L) under reduced pressure and dried in a vacuum oven
(25.degree. C., 0.1 mm Hg, 40 h) to afford 1526 g of an off-white
foamy solid (95%).
Preparation of
5'-O-Dimethoxytrityl-2'-O-(2-methoxyethyl)-5-methylcytidine
intermediate
[0155] To a 50 L Schott glass-lined steel reactor equipped with an
electric stirrer, reagent addition pump (connected to an addition
funnel), heating/cooling system, internal thermometer and argon gas
line was added
5'-O-dimethoxytrityl-2'-O-(2-methoxyethyl)-5-methyl-uridine (2.616
kg, 4.23 mol, purified by base extraction only and no scrub
column), anhydrous acetonitrile (20 L), and TEA (9.5 L, 67.7 mol,
16 eq). The mixture was chilled with stirring to -10.degree. C.
internal temperature (external -20.degree. C.).
Trimethylsilylchloride (1.60 L, 12.7 mol, 3.0 eq) was added over 30
min. while maintaining the internal temperature below -5.degree.
C., followed by a wash of anhydrous acetonitrile (1 L). (Note: the
reaction is mildly exothermic and copious hydrochloric acid fumes
form over the course of the addition). The reaction was allowed to
warm to 0.degree. C. and the reaction progress was confirmed by TLC
(EtOAc, R.sub.f 0.68 and 0.87 for starting material and silyl
product, respectively). Upon completion, triazole (2.34 kg, 33.8
mol, 8.0 eq) was added the reaction was cooled to -20.degree. C.
internal temperature (external -30.degree. C.). Phosphorous
oxychloride (793 mL, 8.51 mol, 2.01 eq) was added slowly over 60
min so as to maintain the temperature between -20.degree. C. and
-10.degree. C. (note: strongly exothermic), followed by a wash of
anhydrous acetonitrile (1 L). The reaction was warmed to 0.degree.
C. and stirred for 1 h, at which point it was an off-white thick
suspension. TLC indicated a complete conversion to the triazole
product (EtOAc, R.sub.f 0.87 to 0.75 with the product spot glowing
in long wavelength UV light). The reaction was cooled to
-15.degree. C. and water (5 L) was slowly added at a rate to
maintain the temperature below +10.degree. C. in order to quench
the reaction and to form a homogenous solution. (Caution: this
reaction is initially very strongly exothermic). Approximately
one-half of the reaction volume (22 L) was transferred by air pump
to another vessel, diluted with EtOAc (12 L) and extracted with
water (2.times.8 L). The second half of the reaction was treated in
the same way. The combined aqueous layers were back-extracted with
EtOAc (8 L) The organic layers were combined and concentrated in a
20 L rotary evaporator to an oily foam. The foam was coevaporated
with anhydrous acetonitrile (4 L) to remove EtOAc. (note: dioxane
may be used instead of anhydrous acetonitrile if dried to a hard
foam). The residue was dissolved in dioxane (2 L) and concentrated
ammonium hydroxide (750 mL) was added. A homogenous solution formed
in a few minutes and the reaction was allowed to stand overnight
TLC indicated a complete reaction (CH.sub.2Cl.sub.2-acetone-MeOH,
20:5:3, R.sub.f 0.51). The reaction solution was concentrated on a
rotary evaporator to a dense foam and slowly redissolved in warm
CH.sub.2Cl.sub.2 (4 L, 40.degree. C.) and transferred to a 20 L
glass extraction vessel equipped with a air-powered stirrer. The
organic layer was extracted with water (2.times.6 L) to remove the
triazole by-product. (Note: In the first extraction an emulsion
formed which took about 2 h to resolve). The water layer was
back-extracted with CH.sub.2Cl.sub.2 (2.times.2 L), which in turn
was washed with water (3 L). The combined organic layer was
concentrated in 2.times.20 L flasks to a gum and then
recrystallized from EtOAc seeded with crystalline product. After
sitting overnight, the first crop was collected on a 25 cm Coors
Buchner funnel and washed repeatedly with EtOAc until a white
free-flowing powder was left (about 3.times.3 L). The filtrate was
concentrated to an oil recrystallized from EtOAc, and collected as
above. The solid was air-dried in pans for 48 h, then further dried
in a vacuum oven (50.degree. C., 0.1 mm Hg, 17 h) to afford 2248 g
of a bright white, dense solid (86%). An HPLC analysis indicated
both crops to be 99.4% pure and NMR spectroscopy indicated only a
faint trace of EtOAc remained.
Preparation of
5'-O-dimethoxytrityl-2'-O-(2-methoxyethyl)-N4-benzoyl-5-met-
hyl-cytidine penultimate intermediate
[0156] Crystalline
5'-O-dimethoxytrityl-2'-O-(2-methoxyethyl)-5-methyl-cyt- idine
(1000 g, 1.62 mol) was suspended in anhydrous DMF (3 kg) at ambient
temperature and stirred under an Ar atmosphere. Benzoic anhydride
(439.3 g, 1.94 mol) was added in one portion. The solution
clarified after 5 hours and was stirred for 16 h. HPLC indicated
0.45% starting material remained (as well as 0.32% N4, 3'-O-bis
Benzoyl). An additional amount of benzoic anhydride (6.0 g, 0.0265
mol) was added and after 17 h, HPLC indicated no starting material
was present. TEA (450 mL, 3.24 mol) and toluene (6 L) were added
with stirring for 1 minute. The solution was washed with water
(4.times.4 L), and brine (2.times.4 L). The organic layer was
partially evaporated on a 20 L rotary evaporator to remove 4 L of
toluene and traces of water. HPLC indicated that the bis benzoyl
side product was present as a 6% impurity. The residue was diluted
with toluene (7 L) and anhydrous DMSO (200 mL, 2.82 mol) and sodium
hydride (60% in oil, 70 g, 1.75 mol) was added in one portion with
stirring at ambient temperature over 1 h. The reaction was quenched
by slowly adding then washing with aqueous citric acid (10%, 100 mL
over 10 min, then 2.times.4 L), followed by aqueous sodium
bicarbonate (2%, 2 L), water (2.times.4 L) and brine (4 L). The
organic layer was concentrated on a 20 L rotary evaporator to about
2 L total volume. The residue was purified by silica gel column
chromatography (6 L Buchner funnel containing 1.5 kg of silica gel
wetted with a solution of EtOAc-hexanes-TEA (70:29:1)). The product
was eluted with the same solvent (30 L) followed by straight EtOAc
(6 L). The fractions containing the product were combined,
concentrated on a rotary evaporator to a foam and then dried in a
vacuum oven (50.degree. C., 0.2 mm Hg, 8 h) to afford 1155 g of a
crisp, white foam (98%). HPLC indicated a purity of >99.7%.
Preparation of
[5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)-
-N.sup.4-benzoyl-5-methylcytidin-3'-O-yl]-2-cyanoethyl-N,N-diisopropylphos-
phoramidite (MOE 5-Me-C amidite)
[0157]
5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)-N.sup.4--
benzoyl-5-methylcytidine (1082 g, 1.5 mol) was dissolved in
anhydrous DMF (2 L) and co-evaporated with toluene (300 ml) at
50.degree. C. under reduced pressure. The mixture was cooled to
room temperature and 2-cyanoethyl tetraisopropylphosphorodiamidite
(680 g, 2.26 mol) and tetrazole (52.5 g, 0.75 mol) were added. The
mixture was shaken until all tetrazole was dissolved,
N-methylimidazole (30 ml) was added, and the mixture was left at
room temperature for 5 hours. TEA (300 ml) was added, the mixture
was diluted with DMF (1 L) and water (400 ml) and extracted with
hexane (3.times.3 L). The mixture was diluted with water (1.2 L)
and extracted with a mixture of toluene (9 L) and hexanes (6 L).
The two layers were separated and the upper layer was washed with
DMF-water (60:40 v/v, 3.times.3 L) and water (3.times.2 L). The
organic layer was dried (Na.sub.2SO.sub.4), filtered and
evaporated. The residue was co-evaporated with acetonitrile
(2.times.2 L) under reduced pressure and dried in a vacuum oven
(25.degree. C., 0.1 mm Hg, 40 h) to afford 1336 g of an off-white
foam (97%).
Preparation of
[5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)
-N.sup.6-benzoyladenosin-3'-O-yl]-2-cyanoethyl-N,N-diisopropylphosphorami-
dite (MOE A amdite)
[0158]
5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)-N.sup.6--
benzoyladenosine (purchased from Reliable Biopharmaceutical, St.
Lois, Mo.), 1098 g, 1.5 mol) was dissolved in anhydrous DMF (3 L)
and co-evaporated with toluene (300 ml) at 50.degree. C. The
mixture was cooled to room temperature and 2-cyanoethyl
tetraisopropylphosphorodiamid- ite (680 g, 2.26 mol) and tetrazole
(78.8 g, 1.24 mol) were added. The mixture was shaken until all
tetrazole was dissolved, N-methylimidazole (30 ml) was added, and
mixture was left at room temperature for 5 hours. TEA (300 ml) was
added, the mixture was diluted with DMF (1 L) and water (400 ml)
and extracted with hexanes (3.times.3 L). The mixture was diluted
with water (1.4 L) and extracted with the mixture of toluene (9 L)
and hexanes (6 L). The two layers were separated and the upper
layer was washed with DMF-water (60:40, v/v, 3.times.3 L) and water
(3.times.2 L). The organic layer was dried (Na.sub.2SO.sub.4),
filtered and evaporated to a sticky foam. The residue was
co-evaporated with acetonitrile (2.5 L) under reduced pressure and
dried in a vacuum oven (25.degree. C., 0.1 mm Hg, 40 h) to afford
1350 g of an off-white foam solid (96%).
Prepartion of
[5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)--
N.sup.4-isobutyrylguanosin-3'-O-yl]-2-cyanoethyl-N,N-diisopropylphosphoram-
idite (MOE G amidite)
[0159]
5'-O-(4,4'-Dimethoxytriphenylmethyl)-2'-O-(2-methoxyethyl)-N.sup.4--
isobutyrlguanosine (purchased from Reliable Biopharmaceutical, St.
Louis, Mo., 1426 g, 2.0 mol) was dissolved in anhydrous DMF (2 L).
The solution was co-evaporated with toluene (200 ml) at 50.degree.
C., cooled to room temperature and 2-cyanoethyl
tetraisopropylphosphorodiamidite (900 g, 3.0 mol) and tetrazole (68
g, 0.97 mol) were added. The mixture was shaken until all tetrazole
was dissolved, N-methylimidazole (30 ml) was added, and the mixture
was left at room temperature for 5 hours. TEA (300 ml) was added,
the mixture was diluted with DMF (2 L) and water (600 ml) and
extracted with hexanes (3.times.3 L). The mixture was diluted with
water (2 L) and extracted with a mixture of toluene (10 L) and
hexanes (5 L). The two layers were separated and the upper layer
was washed with DMF-water (60:40, v/v, 3.times.3 L). EtOAc (4 L)
was added and the solution was washed with water (3.times.4 L). The
organic layer was dried (Na.sub.2SO.sub.4), filtered and evaporated
to approx. 4 kg. Hexane (4 L) was added, the mixture was shaken for
10 min, and the supernatant liquid was decanted. The residue was
co-evaporated with acetonitrile (2.times.2 L) under reduced
pressure and dried in a vacuum oven (25.degree. C., 0.1 mm Hg, 40
h) to afford 1660 g of an off-white foamy solid (91%).
2'-O-(Aminooxyethyl) nucleoside amidites and
2'-O-(dimethylaminooxyethyl) nucleoside amidites
2'-(Dimethylaminooxyethoxy) nucleoside amidites
[0160] 2'-(Dimethylaminooxyethoxy) nucleoside amidites (also known
in the art as 2'-O-(dimethylaminooxyethyl) nucleoside amidites) are
prepared as described in the following paragraphs. Adenosine,
cytidine and guanosine nucleoside amidites are prepared similarly
to the thymidine (5-methyluridine) except the exocyclic amines are
protected with a benzoyl moiety in the case of adenosine and
cytidine and with isobutyryl in the case of guanosine.
5'-O-tert-Butyldiphenylsilyl-O.sup.2-2'-anhydro-5-methyluridine
[0161] O.sup.2-2'-anhydro-5-methyluridine (Pro. Bio. Sint., Varese,
Italy, 100.0g, 0.416 mmol), dimethylaminopyridine (0.66 g, 0.013eq,
0.0054 mmol) were dissolved in dry pyridine (500 ml) at ambient
temperature under an argon atmosphere and with mechanical stirring.
tert-Butyldiphenylchlorosi- lane (125.8 g, 119.0 mL, 1.1eq, 0.458
mmol) was added in one portion. The reaction was stirred for 16 h
at ambient temperature. TLC (R.sub.f 0.22, EtOAc) indicated a
complete reaction. The solution was concentrated under reduced
pressure to a thick oil. This was partitioned between
CH.sub.2Cl.sub.2 (1 L) and saturated sodium bicarbonate (2.times.1
L) and brine (1 L). The organic layer was dried over sodium
sulfate, filtered, and concentrated under reduced pressure to a
thick oil. The oil was dissolved in a 1:1 mixture of EtOAc and
ethyl ether (600 mL) and cooling the solution to -10.degree. C.
afforded a white crystalline solid which was collected by
filtration, washed with ethyl ether (3.times.200 mL) and dried
(40.degree. C., 1 mm Hg, 24 h) to afford 149 g of white solid
(74.8%). TLC and NMR spectroscopy were consistent with pure
product.
5'-O-tert-Butyldiphenylsilyl-2'-O-(2-hydroxyethyl)-5-methyluridine
[0162] In the fume hood, ethylene glycol (350 mL, excess) was added
cautiously with manual stirring to a 2 L stainless steel pressure
reactor containing borane in tetrahydrofuran (1.0 M, 2.0 eq, 622
mL). (Caution: evolves hydrogen gas).
5'-O-tert-Butyldiphenylsilyl-O.sup.2 -2'-anhydro-5-methyluridine
(149 g, 0.311 mol) and sodium bicarbonate (0.074 g, 0.003 eq) were
added with manual stirring. The reactor was sealed and heated in an
oil bath until an internal temperature of 160.degree. C. was
reached and then maintained for 16 h (pressure<100 psig). The
reaction vessel was cooled to ambient temperature and opened. TLC
(EtOAc, R.sub.f 0.67 for desired product and R.sub.f 0.82 for ara-T
side product) indicated about 70% conversion to the product. The
solution was concentrated under reduced pressure (10 to 1 mm Hg) in
a warm water bath (40-100.degree. C.) with the more extreme
conditions used to remove the ethylene glycol. (Alternatively, once
the THF has evaporated the solution can be diluted with water and
the product extracted into EtOAc). The residue was purified by
column chromatography (2 kg silica gel, EtOAc-hexanes gradient 1:1
to 4:1). The appropriate fractions were combined, evaporated and
dried to afford 84 g of a white crisp foam (50%), contaminated
starting material (17.4 g, 12% recovery) and pure reusable starting
material (20 g, 13% recovery). TLC and NMR spectroscopy were
consistent with 99% pure product.
2'-O-([2-phthalimidoxy)ethyl]-5'-t-butyldiphenylsilyl-5-methyluridine
[0163]
5'-O-tert-Butyldiphenylsilyl-2'-O-(2-hydroxyethyl)-5-methyluridine
(20 g, 36.98 mmol) was mixed with triphenylphosphine (11.63 g,
44.36 mmol) and N-hydroxyphthalimide (7.24 g, 44.36 mmol) and dried
over P.sub.2O.sub.5 under high vacuum for two days at 40.degree. C.
The reaction mixture was flushed with argon and dissolved in dry
THF (369.8 mL, Aldrich, sure seal bottle). Diethyl-azodicarboxylate
(6.98 mL, 44.36 mmol) was added dropwise to the reaction mixture
with the rate of addition maintained such that the resulting deep
red coloration is just discharged before adding the next drop. The
reaction mixture was stirred for 4 hrs., after which time TLC
(EtOAc:hexane, 60:40) indicated that the reaction was complete. The
solvent was evaporated in vacuuo and the residue purified by flash
column chromatography (eluted with 60:40 EtOAc:hexane), to yield
2'-O-([2-phthalimidoxy)ethyl]-5'-t-butyldiphenyls-
ilyl-5-methyluridine as white foam (21.819 g, 86%) upon rotary
evaporation.
5'-O-tert-butyldiphenylsilyl-2'-O-[(2-formadoximinooxy)ethyl]-5-methylurid-
ine
[0164]
2'-O-([2-phthalimidoxy)ethyl]-5'-t-butyldiphenylsilyl-5-methyluridi-
ne (3.1 g, 4.5 mmol) was dissolved in dry CH.sub.2Cl.sub.2 (4.5 mL)
and methylhydrazine (300 mL, 4.64 mmol) was added dropwise at
-10.degree. C. to 0.degree. C. After 1 h the mixture was filtered,
the filtrate washed with ice cold CH.sub.2Cl.sub.2, and the
combined organic phase was washed with water and brine and dried
(anhydrous Na.sub.2SO.sub.4). The solution was filtered and
evaporated to afford 2'-O-(aminooxyethyl) thymidine, which was then
dissolved in MeOH (67.5 mL). Formaldehyde (20% aqueous solution,
w/w, 1.1 eq.) was added and the resulting mixture was stirred for 1
h. The solvent was removed under vacuum and the residue was
purified by column chromatography to yield
5'-O-tert-butyldiphenylsilyl-2- '-O-[(2-formadoximinooxy)
ethyl]-5-methyluridine as white foam (1.95 g, 78%) upon rotary
evaporation.
5'-O-tert-Butyldiphenylsilyl-2'-O-[N,N
dimethylaminooxyethyl]-5-methylurid- ine
[0165]
5'-O-tert-butyldiphenylsilyl-2'-O-[(2-formadoximinooxy)ethyl]-5-met-
hyluridine (1.77 g, 3.12 mmol) was dissolved in a solution of 1M
pyridinium p-toluenesulfonate (PPTS) in dry MeOH (30.6 mL) and
cooled to 10.degree. C. under inert atmosphere. Sodium
cyanoborohydride (0.39 g, 6.13 mmol) was added and the reaction
mixture was stirred. After 10 minutes the reaction was warmed to
room temperature and stirred for 2 h. while the progress of the
reaction was monitored by TLC (5% MeOH in CH.sub.2Cl.sub.2).
Aqueous NaHCO.sub.3 solution (5%, 10 mL) was added and the product
was extracted with EtOAc (2.times.20 mL). The organic phase was
dried over anhydrous Na.sub.2SO.sub.4, filtered, and evaporated to
dryness. This entire procedure was repeated with the resulting
residue, with the exception that formaldehyde (20% w/w, 30 mL, 3.37
mol) was added upon dissolution of the residue in the PPTS/MeOH
solution. After the extraction and evaporation, the residue was
purified by flash column chromatography and (eluted with 5% MeOH in
CH.sub.2Cl.sub.2) to afford
5'-O-tert-butyldiphenylsilyl-2'-O-[N,N-dimethylaminooxyethyl]-5-methyluri-
dine as a white foam (14.6 g, 80%) upon rotary evaporation.
2'-O-(dimethylaminooxyethyl)-5-methyluridine
[0166] Triethylamine trihydrofluoride (3.91 mL, 24.0 mmol) was
dissolved in dry THF and TEA (1.67 mL, 12 mmol, dry, stored over
KOH) and added to
5'-O-tert-butyldiphenylsilyl-2'-O-[N,N-dimethylaminooxyethyl]-5-methyluri-
dine (1.40 g, 2.4 mmol). The reaction was stirred at room
temperature for 24 hrs and monitored by TLC (5% MeOH in
CH.sub.2Cl.sub.2). The solvent was removed under vacuum and the
residue purified by flash column chromatography (eluted with 10%
MeOH in CH.sub.2Cl.sub.2) to afford
2'-O-(dimethylaminooxyethyl)-5-methyluridine (766 mg, 92.5%) upon
rotary evaporation of the solvent.
5'-O-DMT-2'-O-(dimethylaminooxyethyl)-5-methyluridine
[0167] 2'-O-(dimethylaminooxyethyl)-5-methyluridine (750 mg, 2.17
mmol) was dried over P.sub.2O.sub.5 under high vacuum overnight at
40.degree. C., co-evaporated with anhydrous pyridine (20 mL), and
dissolved in pyridine (11 mL) under argon atmosphere.
4-dimethylaminopyridine (26.5 mg, 2.60 mmol) and
4,4'-dimethoxytrityl chloride (880 mg, 2.60 mmol) were added to the
pyridine solution and the reaction mixture was stirred at room
temperature until all of the starting material had reacted.
Pyridine was removed under vacuum and the residue was purified by
column chromatography (eluted with 10% MeOH in CH.sub.2Cl.sub.2
containing a few drops of pyridine) to yield
5'-O-DMT-2'-O-(dimethylamino-oxyethyl)-5-meth- yluridine (1.13 g,
80%) upon rotary evaporation.
5'-O-DMT-2'-O-(2-N,N-dimethylaminooxyethyl)-5-methyluridine-3'-[(2-cyanoet-
hyl)-N,N-diisopropylphosphoramidite]
[0168] 5'-O-DMT-2'-O-(dimethylaminooxyethyl)-5-methyluridine (1.08
g, 1.67 mmol) was co-evaporated with toluene (20 mL),
N,N-diisopropylamine tetrazonide (0.29 g, 1.67 mmol) was added and
the mixture was dried over P.sub.2O.sub.5 under high vacuum
overnight at 40.degree. C. This was dissolved in anhydrous
acetonitrile (8.4 mL) and 2-cyanoethyl-N,N,N.sup.1-
,N.sup.1-tetraisopropylphosphoramidite (2.12 mL, 6.08 mmol) was
added. The reaction mixture was stirred at ambient temperature for
4 h under inert atmosphere. The progress of the reaction was
monitored by TLC (hexane:EtOAc 1:1). The solvent was evaporated,
then the residue was dissolved in EtOAc (70 mL) and washed with 5%
aqueous NaHCO.sub.3 (40 mL). The EtOAc layer was dried over
anhydrous Na.sub.2SO.sub.4, filtered, and concentrated. The residue
obtained was purified by column chromatography (EtOAc as eluent) to
afford 5'-O-DMT-2'-O-(2-N,N-dimethyla-
minooxyethyl)-5-methyluridine-3'-[(2-cyanoethyl)-N,N-diisopropylphosphoram-
idite] as a foam (1.04 g, 74.9%) upon rotary evaporation.
b 2'-(Aminooxyethoxy) nucleoside amidites
[0169] 2'-(Aminooxyethoxy) nucleoside amidites (also known in the
art as 2'-O-(aminooxyethyl) nucleoside amidites) are prepared as
described in the following paragraphs. Adenosine, cytidine and
thymidine nucleoside amidites are prepared similarly.
N2-isobutyryl-6-O-diphenylcarbamoyl-2'-O-(2-ethylacetyl)-5'-O-(4,4'-dimeth-
oxytrityl)guanosine-3'-[(2-cyanoethyl)-N,N-diisopropylphosphoramidite]
[0170] The 2'-O-aminooxyethyl guanosine analog may be obtained by
selective 2'-O-alkylation of diaminopurine riboside. Multigram
quantities of diaminopurine riboside may be purchased from Schering
AG (Berlin) to provide 2'-O-(2-ethylacetyl) diaminopurine riboside
along with a minor amount of the 3'-O-isomer. 2'-O-(2-ethylacetyl)
diaminopurine riboside may be resolved and converted to
2'-O-(2-ethylacetyl)guanosine by treatment with adenosine
deaminase. (McGee, D. P. C., Cook, P. D., Guinosso, C. J., WO
94/02501 A1 940203.) Standard protection procedures should afford
2'-O-(2-ethylacetyl)-5'-O-(4,4'-dimethoxytrityl)guanosine and
2-N-isobutyryl-6-O-diphenylcarbamoyl-2'-O-(2-ethylacetyl)-5'-O-(4,4'--
dimethoxytrityl)guanosine which may be reduced to provide
2-N-isobutyryl-6-O-diphenylcarbamoyl-2'-O-(2-hydroxyethyl)-5'-O-(4,4'-dim-
ethoxytrityl)guanosine. As before the hydroxyl group may be
displaced by N-hydroxyphthalimide via a Mitsunobu reaction, and the
protected nucleoside may be phosphitylated as usual to yield
2-N-isobutyryl-6-O-diphenylcarbamoyl-2'-O-([2-phthalmidoxy]ethyl)-5'-O-(4-
,4'-dimethoxytrityl)guanosine-3'-[(2-cyanoethyl)-N,N-diisopropylphosphoram-
idite].
2'-dimethylaminoethoxyethoxy (2'-DMAEOE) nucleoside amidites
[0171] 2'-dimethylaminoethoxyethoxy nucleoside amidites (also known
in the art as 2'-O-dimethylaminoethoxyethyl, i.e.,
2'-O--CH.sub.2--O--CH.sub.2--- N(CH.sub.2).sub.2, or 2'-DMAEOE
nucleoside amidites) are prepared as follows. Other nucleoside
amidites are prepared similarly.
2'-O-[2(2-N,N-dimethylaminoethoxy)ethyl]-5-methyl uridine
[0172] 2[2-(Dimethylamino)ethoxy]ethanol (Aldrich, 6.66 g, 50 mmol)
was slowly added to a solution of borane in tetrahydrofuran (1 M,
10 mL, 10 mmol) with stirring in a 100 mL bomb. (Caution: Hydrogen
gas evolves as the solid dissolves).
O.sup.2-,2'-anhydro-5-methyluridine (1.2 g, 5 mmol), and sodium
bicarbonate (2.5 mg) were added and the bomb was sealed, placed in
an oil bath and heated to 155.degree. C. for 26 h. then cooled to
room temperature. The crude solution was concentrated, the residue
was diluted with water (200 mL) and extracted with hexanes (200
mL). The product was extracted from the aqueous layer with EtOAc
(3.times.200 mL) and the combined organic layers were washed once
with water, dried over anhydrous sodium sulfate, filtered and
concentrated. The residue was purified by silica gel column
chromatography (eluted with 5:100:2 MeOH/CH.sub.2Cl.sub.2/TEA) as
the eluent. The appropriate fractions were combined and evaporated
to afford the product as a white solid.
5'-O-dimethoxytrityl-2'-O-[2(2-N,N-dimethylaminoethoxy)-ethyl)]-5-methyl
uridine
[0173] To 0.5 g (1.3 mmol) of
2'-O-[2(2-N,N-dimethylaminoethoxy)ethyl)]-5-- methyl uridine in
anhydrous pyridine (8 mL), was added TEA (0.36 mL) and
dimethoxytrityl chloride (DMT-Cl, 0.87 g, 2 eq.) and the reaction
was stirred for 1 h. The reaction mixture was poured into water
(200 mL) and extracted with CH.sub.2Cl.sub.2 (2.times.200 mL). The
combined CH.sub.2Cl.sub.2 layers were washed with saturated
NaHCO.sub.3 solution, followed by saturated NaCl solution, dried
over anhydrous sodium sulfate, filtered and evaporated. The residue
was purified by silica gel column chromatography (eluted with
5:100:1 MeOH/CH.sub.2Cl.sub.2/TEA) to afford the product.
5'-O-Dimethoxytrityl-2'-O-[2(2-N,N-dimethylaminoethoxy)ethyl)]-5-methyl
uridine-3'-O-(cyanoethyl-N,N-diisopropyl)phosphoramidite
[0174] Diisopropylaminotetrazolide (0.6 g) and
2-cyanoethoxy-N,N-diisoprop- yl phosphoramidite (1.1 mL, 2 eq.)
were added to a solution of
5'-O-dimethoxytrityl-2'-O-[2(2-N,N-dimethylaminoethoxy)ethyl)]-5-methylur-
idine (2.17 g, 3 mmol) dissolved in CH.sub.2Cl.sub.2 (20 mL) under
an atmosphere of argon. The reaction mixture was stirred overnight
and the solvent evaporated. The resulting residue was purified by
silica gel column chromatography with EtOAc as the eluent to afford
the title compound.
Example 2
Oligonucleotide Synthesis
[0175] Unsubstituted and substituted phosphodiester (P.dbd.O)
oligonucleotides are synthesized on an automated DNA synthesizer
(Applied Biosystems model 394) using standard phosphoramidite
chemistry with oxidation by iodine.
[0176] Phosphorothioates (P.dbd.S) are synthesized similar to
phosphodiester oligonucleotides with the following exceptions:
thiation was effected by utilizing a 10% w/v solution of
3H-1,2-benzodithiole-3-on- e 1,1-dioxide in acetonitrile for the
oxidation of the phosphite linkages. The thiation reaction step
time was increased to 180 sec and preceded by the normal capping
step. After cleavage from the CPG column and deblocking in
concentrated ammonium hydroxide at 55.degree. C. (12-16 hr), the
oligonucleotides were recovered by precipitating with >3 volumes
of ethanol from a 1 M NH.sub.4OAc solution. Phosphinate
oligonucleotides are prepared as described in U.S. Pat. No.
5,508,270, herein incorporated by reference.
[0177] Alkyl phosphonate oligonucleotides are prepared as described
in U.S. Pat. No. 4,469,863, herein incorporated by reference.
[0178] 3'-Deoxy-3'-methylene phosphonate oligonucleotides are
prepared as described in U.S. Pat. No. 5,610,289 or 5,625,050,
herein incorporated by reference.
[0179] Phosphoramidite oligonucleotides are prepared as described
in U.S. Pat. No. 5,256,775 or U.S. Pat. No. 5,366,878, herein
incorporated by reference.
[0180] Alkylphosphonothioate oligonucleotides are prepared as
described in published PCT applications PCT/US94/00902 and
PCT/US93/06976 (published as WO 94/17093 and WO 94/02499,
respectively), herein incorporated by reference.
[0181] 3'-Deoxy-3'-amino phosphoramidate oligonucleotides are
prepared as described in U.S. Pat. No. 5,476,925, herein
incorporated by reference.
[0182] Phosphotriester oligonucleotides are prepared as described
in U.S. Pat. No. 5,023,243, herein incorporated by reference.
[0183] Borano phosphate oligonucleotides are prepared as described
in U.S. Pat. Nos. 5,130,302 and 5,177,198, both herein incorporated
by reference.
Example 3
Oligonucleoside Synthesis
[0184] Methylenemethylimino linked oligonucleosides, also
identified as MMI linked oligonucleosides, methylenedimethylhydrazo
linked oligonucleosides, also identified as MDH linked
oligonucleosides, and methylenecarbonylamino linked
oligonucleosides, also identified as amide-3 linked
oligonucleosides, and methyleneaminocarbonyl linked
oligonucleosides, also identified as amide-4 linked
oligonucleosides, as well as mixed backbone compounds having, for
instance, alternating MMI and P.dbd.O or P.dbd.S linkages are
prepared as described in U.S. Pat. Nos. 5,378,825, 5,386,023,
5,489,677, 5,602,240 and 5,610,289, all of which are herein
incorporated by reference.
[0185] Formacetal and thioformacetal linked oligonucleosides are
prepared as described in U.S. Pat. Nos. 5,264,562 and 5,264,564,
herein incorporated by reference.
[0186] Ethylene oxide linked oligonucleosides are prepared as
described in U.S. Pat. No. 5,223,618, herein incorporated by
reference.
Example 4
PNA Synthesis
[0187] Peptide nucleic acids (PNAs) are prepared in accordance with
any of the various procedures referred to in Peptide Nucleic Acids
(PNA): Synthesis, Properties and Potential Applications, Bioorganic
& Medicinal Chemistry, 1996, 4, 5-23. They may also be prepared
in accordance with U.S. Pat. Nos. 5,539,082, 5,700,922, and
5,719,262, herein incorporated by reference.
Example 5
Synthesis of Chimeric Oligonucleotides
[0188] Chimeric oligonucleotides, oligonucleosides or mixed
oligonucleotides/oligonucleosides of the invention can be of
several different types. These include a first type wherein the
"gap" segment of linked nucleosides is positioned between 5' and 3'
"wing" segments of linked nucleosides and a second "open end" type
wherein the "gap" segment is located at either the 3' or the 5'
terminus of the oligomeric compound. Oligonucleotides of the first
type are also known in the art as "gapmers" or gapped
oligonucleotides. Oligonucleotides of the second type are also
known in the art as "hemimers" or "wingmers".
[2'-O-Me]--[2'-deoxy]--[2'-O-Me] Chimeric Phosphorothioate
Oligonucleotides
[0189] Chimeric oligonucleotides having 2'-O-alkyl phosphorothioate
and 2'-deoxy phosphorothioate oligonucleotide segments are
synthesized using an Applied Biosystems automated DNA synthesizer
Model 394, as above. Oligonucleotides are synthesized using the
automated synthesizer and
2'-deoxy-5'-dimethoxytrityl-3'-O-phosphoramidite for the DNA
portion and 5'-dimethoxytrityl-2'-O-methyl-3'-O-phosphoramidite for
5' and 3' wings. The standard synthesis cycle is modified by
incorporating coupling steps with increased reaction times for the
5'-dimethoxytrityl-2'-O-methyl-3'-O- -phosphoramidite. The fully
protected oligonucleotide is cleaved from the support and
deprotected in concentrated ammonia (NH.sub.4OH) for 12-16 hr at
55.degree. C. The deprotected oligo is then recovered by an
appropriate method (precipitation, column chromatography, volume
reduced in vacuo and analyzed spetrophotometrically for yield and
for purity by capillary electrophoresis and by mass
spectrometry.
[2'-O-(2-Methoxyethyl)]--[2'-deoxy]--[2'-O-(Methoxyethyl)] Chimeric
Phosphorothioate Oligonucleotides
[0190] [2'-O-(2-methoxyethyl)]--[2'-deoxy]--[-2'-O-(methoxyethyl)]
chimeric phosphorothioate oligonucleotides were prepared as per the
procedure above for the 2'-O-methyl chimeric oligonucleotide, with
the substitution of 2'-O-(methoxyethyl) amidites for the
2'-O-methyl amidites.
[2'-O-(2-Methoxyethyl)Phosphodiester]--[2'-deoxy
Phosphorothioate]--[2'-O-- (2-Methoxyethyl) Phosphodiester]
Chimeric Oligonucleotides
[0191] [2'-O-(2-methoxyethyl phosphodiester]--[2'-deoxy
phosphorothioate]--[2'-O-(methoxyethyl) phosphodiester] chimeric
oligonucleotides are prepared as per the above procedure for the
2'-O-methyl chimeric oligonucleotide with the substitution of
2'-O-(methoxyethyl) amidites for the 2'-O-methyl amidites,
oxidation with iodine to generate the phosphodiester
internucleotide linkages within the wing portions of the chimeric
structures and sulfurization utilizing 3,H-1,2 benzodithiole-3-one
1,1 dioxide (Beaucage Reagent) to generate the phosphorothioate
internucleotide linkages for the center gap.
[0192] Other chimeric oligonucleotides, chimeric oligonucleosides
and mixed chimeric oligonucleotides/oligonucleosides are
synthesized according to U.S. Pat. No. 5,623,065, herein
incorporated by reference.
Example 6
Oligonucleotide Isolation
[0193] After cleavage from the controlled pore glass solid support
and deblocking in concentrated ammonium hydroxide at 55.degree. C.
for 12-16 hours, the oligonucleotides or oligonucleosides are
recovered by precipitation out of 1 M NH.sub.4OAc with >3
volumes of ethanol. Synthesized oligonucleotides were analyzed by
electrospray mass spectroscopy (molecular weight determination) and
by capillary gel electrophoresis and judged to be at least 70% full
length material. The relative amounts of phosphorothioate and
phosphodiester linkages obtained in the synthesis was determined by
the ratio of correct molecular weight relative to the -16 amu
product (+/-32 +/-48). For some studies oligonucleotides were
purified by HPLC, as described by Chiang et al., J. Biol. Chem.
1991, 266, 18162-18171. Results obtained with HPLC-purified
material were similar to those obtained with non-HPLC purified
material.
Example 7
Oligonucleotide Synthesis--96 Well Plate Format
[0194] Oligonucleotides were synthesized via solid phase P(III)
phosphoramidite chemistry on an automated synthesizer capable of
assembling 96 sequences simultaneously in a 96-well format.
Phosphodiester internucleotide linkages were afforded by oxidation
with aqueous iodine. Phosphorothioate internucleotide linkages were
generated by sulfurization utilizing 3,H-1,2 benzodithiole-3-one
1,1 dioxide (Beaucage Reagent) in anhydrous acetonitrile. Standard
base-protected beta-cyanoethyl-diiso-propyl phosphoramidites were
purchased from commercial vendors (e.g. PE-Applied Biosystems,
Foster City, Calif., or Pharmacia, Piscataway, N.J.). Non-standard
nucleosides are synthesized as per standard or patented methods.
They are utilized as base protected beta-cyanoethyldiisopropyl
phosphoramidites.
[0195] Oligonucleotides were cleaved from support and deprotected
with concentrated NH.sub.4OH at elevated temperature (55-60.degree.
C.) for 12-16 hours and the released product then dried in vacuo.
The dried product was then re-suspended in sterile water to afford
a master plate from which all analytical and test plate samples are
then diluted utilizing robotic pipettors.
Example 8
Oligonucleotide Analysis--96-Well Plate Format
[0196] The concentration of oligonucleotide in each well was
assessed by dilution of samples and UV absorption spectroscopy. The
full-length integrity of the individual products was evaluated by
capillary electrophoresis (CE) in either the 96-well format
(Beckman P/ACE.TM. MDQ) or, for individually prepared samples, on a
commercial CE apparatus (e.g., Beckman P/ACE.TM. 5000, ABI 270).
Base and backbone composition was confirmed by mass analysis of the
compounds utilizing electrospray-mass spectroscopy. All assay test
plates were diluted from the master plate using single and
multi-channel robotic pipettors. Plates were judged to be
acceptable if at least 85% of the compounds on the plate were at
least 85% full length.
Example 9
Cell Culture and Oligonucleotide Treatment
[0197] The effect of antisense compounds on target nucleic acid
expression can be tested in any of a variety of cell types provided
that the target nucleic acid is present at measurable levels. This
can be routinely determined using, for example, PCR or Northern
blot analysis. The following cell types are provided for
illustrative purposes, but other cell types can be routinely used,
provided that the target is expressed in the cell type chosen. This
can be readily determined by methods routine in the art, for
example Northern blot analysis, ribonuclease protection assays, or
RT-PCR.
[0198] T-24 Cells:
[0199] The human transitional cell bladder carcinoma cell line T-24
was obtained from the American Type Culture Collection (ATCC)
(Manassas, Va.). T-24 cells were routinely cultured in complete
McCoy's 5A basal media (Invitrogen Corporation, Carlsbad, Calif.)
supplemented with 10% fetal calf serum (Invitrogen Corporation,
Carlsbad, Calif.), penicillin 100 units per mL, and streptomycin
100 micrograms per mL (Invitrogen Corporation, Carlsbad, Calif.).
Cells were routinely passaged by trypsinization and dilution when
they reached 90% confluence. Cells were seeded into 96-well plates
(Falcon-Primaria #3872) at a density of 7000 cells/well for use in
RT-PCR analysis.
[0200] For Northern blotting or other analysis, cells may be seeded
onto 100 mm or other standard tissue culture plates and treated
similarly, using appropriate volumes of medium and
oligonucleotide.
[0201] A549 Cells:
[0202] The human lung carcinoma cell line A549 was obtained from
the American Type Culture Collection (ATCC) (Manassas, Va.). A549
cells were routinely cultured in DMEM basal media (Invitrogen
Corporation, Carlsbad, Calif.) supplemented with 10% fetal calf
serum (Invitrogen Corporation, Carlsbad, Calif.), penicillin 100
units per mL, and streptomycin 100 micrograms per mL (Invitrogen
Corporation, Carlsbad, Calif.). Cells were routinely passaged by
trypsinization and dilution when they reached 90% confluence.
[0203] NHDF Cells:
[0204] Human neonatal dermal fibroblast (NHDF) were obtained from
the Clonetics Corporation (Walkersville, Md.). NHDFs were routinely
maintained in Fibroblast Growth Medium (Clonetics Corporation,
Walkersville, Md.) supplemented as recommended by the supplier.
Cells were maintained for up to 10 passages as recommended by the
supplier.
[0205] HEK Cells:
[0206] Human embryonic keratinocytes (HEK) were obtained from the
Clonetics Corporation (Walkersville, Md.). HEKs were routinely
maintained in Keratinocyte Growth Medium (Clonetics Corporation,
Walkersville, Md.) formulated as recommended by the supplier. Cells
were routinely maintained for up to 10 passages as recommended by
the supplier.
[0207] HepG2 Cells:
[0208] The human hepatoblastoma cell line HepG2 was obtained from
the American Type Culture Collection (Manassas, Va.). HepG2 cells
were routinely cultured in Eagle's MEM supplemented with 10% fetal
calf serum, non-essential amino acids, and 1 mM sodium pyruvate
(Gibco/Life Technologies, Gaithersburg, Md.). Cells were routinely
passaged by trypsinization and dilution when they reached 90%
confluence. Cells were seeded into 96-well plates (Falcon-Primaria
#3872) at a density of 7000 cells/well for use in RT-PCR
analysis.
[0209] For Northern blotting or other analyses, cells may be seeded
onto 100 mm or other standard tissue culture plates and treated
similarly, using appropriate volumes of medium and
oligonucleotide.
[0210] Treatment with Antisense Compounds:
[0211] When cells reached 70% confluency, they were treated with
oligonucleotide. For cells grown in 96-well plates, wells were
washed once with 100 .mu.L OPTI-MEM.TM.-1 reduced-serum medium
(Invitrogen Corporation, Carlsbad, Calif.) and then treated with
130 .mu.L of OPTI-MEM.TM.-1 containing 3.75 .mu.g/mL LIPOFECTIN.TM.
(Invitrogen Corporation, Carlsbad, Calif.) and the desired
concentration of oligonucleotide. After 4-7 hours of treatment, the
medium was replaced with fresh medium. Cells were harvested 16-24
hours after oligonucleotide treatment.
[0212] The concentration of oligonucleotide used varies from cell
line to cell line. To determine the optimal oligonucleotide
concentration for a particular cell line, the cells are treated
with a positive control oligonucleotide at a range of
concentrations. For human cells the positive control
oligonucleotide is selected from either ISIS 13920
(TCCGTCATCGCTCCTCAGGG, SEQ ID NO: 1) which is targeted to human
H-ras, or ISIS 18078, (GTGCGCGCGAGCCCGAAATC, SEQ ID NO: 2) which is
targeted to human Jun-N-terminal kinase-2 (JNK2). Both controls are
2'-O-methoxyethyl gapmers (2'-O-methoxyethyls shown in bold) with a
phosphorothioate backbone. For mouse or rat cells the positive
control oligonucleotide is ISIS 15770, ATGCATTCTGCCCCCAAGGA, SEQ ID
NO: 3, a 2'-O-methoxyethyl gapmer (2'-O-methoxyethyls shown in
bold) with a phosphorothioate backbone which is targeted to both
mouse and rat c-raf. The concentration of positive control
oligonucleotide that results in 80% inhibition of c-Ha-ras (for
ISIS 13920) or c-raf (for ISIS 15770) mRNA is then utilized as the
screening concentration for new oligonucleotides in subsequent
experiments for that cell line. If 80% inhibition is not achieved,
the lowest concentration of positive control oligonucleotide that
results in 60% inhibition of H-ras or c-raf mRNA is then utilized
as the oligonucleotide screening concentration in subsequent
experiments for that cell line. If 60% inhibition is not achieved,
that particular cell line is deemed as unsuitable for
oligonucleotide transfection experiments. The concentrations of
antisense oligonucleotides used herein are from 50 nM to 300
nM.
Example 10
Analysis of Oligonucleotide Inhibition of Polo-Like Kinase
Expression
[0213] Antisense modulation of polo-like kinase expression can be
assayed in a variety of ways known in the art. For example,
polo-like kinase mRNA levels can be quantitated by, e.g., Northern
blot analysis, competitive polymerase chain reaction (PCR), or
real-time PCR (RT-PCR). Real-time quantitative PCR is presently
preferred. RNA analysis can be performed on total cellular RNA or
poly(A)+ mRNA. The preferred method of RNA analysis of the present
invention is the use of total cellular RNA as described in other
examples herein. Methods of RNA isolation are taught in, for
example, Ausubel, F. M. et al., Current Protocols in Molecular
Biology, Volume 1, pp. 4.1.1-4.2.9 and 4.5.1-4.5.3, John Wiley
& Sons, Inc., 1993. Northern blot analysis is routine in the
art and is taught in, for example, Ausubel, F. M. et al., Current
Protocols in Molecular Biology, Volume 1, pp. 4.2.1-4.2.9, John
Wiley & Sons, Inc., 1996. Real-time quantitative (PCR) can be
conveniently accomplished using the commercially available ABI
PRISM.TM. 7700 Sequence Detection System, available from PE-Applied
Biosystems, Foster City, Calif. and used according to
manufacturer's instructions.
[0214] Protein levels of polo-like kinase can be quantitated in a
variety of ways well known in the art, such as immunoprecipitation,
Western blot analysis (immunoblotting), ELISA or
fluorescence-activated cell sorting (FACS). Antibodies directed to
polo-like kinase can be identified and obtained from a variety of
sources, such as the MSRS catalog of antibodies (Aerie Corporation,
Birmingham, Mich.), or can be prepared via conventional antibody
generation methods. Methods for preparation of polyclonal antisera
are taught in, for example, Ausubel, F. M. et al., (Current
Protocols in Molecular Biology, Volume 2, pp. 11.12.1-11.12.9, John
Wiley & Sons, Inc., 1997). Preparation of monoclonal antibodies
is taught in, for example, Ausubel, F. M. et al., (Current
Protocols in Molecular Biology, Volume 2, pp. 11.4.1-11.11.5, John
Wiley & Sons, Inc., 1997).
[0215] Immunoprecipitation methods are standard in the art and can
be found at, for example, Ausubel, F. M. et al., (Current Protocols
in Molecular Biology, Volume 2, pp. 10.16.1-10.16.11, John Wiley
& Sons, Inc., 1998). Western blot (immunoblot) analysis is
standard in the art and can be found at, for example, Ausubel, F.
M. et al., (Current Protocols in Molecular Biology, Volume 2, pp.
10.8.1-10.8.21, John Wiley & Sons, Inc., 1997). Enzyme-linked
immunosorbent assays (ELISA) are standard in the art and can be
found at, for example, Ausubel, F. M. et al., (Current Protocols in
Molecular Biology, Volume 2, pp. 11.2.1-11.2.22, John Wiley &
Sons, Inc., 1991).
Example 11
Poly(A)+ mRNA Isolation
[0216] Poly(A)+ mRNA was isolated according to Miura et al., (Clin.
Chem., 1996, 42, 1758-1764). Other methods for poly(A)+ mRNA
isolation are taught in, for example, Ausubel, F. M. et al.,
(Current Protocols in Molecular Biology, Volume 1, pp. 4.5.1-4.5.3,
John Wiley & Sons, Inc., 1993). Briefly, for cells grown on
96-well plates, growth medium was removed from the cells and each
well was washed with 200 .mu.L cold PBS. 60 .mu.L lysis buffer (10
mM Tris-HCl, pH 7.6, 1 mM EDTA, 0.5 M NaCl, 0.5% NP-40, 20 mM
vanadyl-ribonucleoside complex) was added to each well, the plate
was gently agitated and then incubated at room temperature for five
minutes. 55 .mu.L of lysate was transferred to Oligo d(T) coated
96-well plates (AGCT Inc., Irvine Calif.). Plates were incubated
for 60 minutes at room temperature, washed 3 times with 200 .mu.L
of wash buffer (10 mM Tris-HCl pH 7.6, 1 mM EDTA, 0.3 M NaCl).
After the final wash, the plate was blotted on paper towels to
remove excess wash buffer and then air-dried for 5 minutes. 60
.mu.L of elution buffer (5 mM Tris-HCl pH 7.6), preheated to
70.degree. C., was added to each well, the plate was incubated on a
90.degree. C. hot plate for 5 minutes, and the eluate was then
transferred to a fresh 96-well plate.
[0217] Cells grown on 100 mm or other standard plates may be
treated similarly, using appropriate volumes of all solutions.
Example 12
Total RNA Isolation
[0218] Total RNA was isolated using an RNEASY 96.TM. kit and
buffers purchased from Qiagen Inc. (Valencia, Calif.) following the
manufacturer's recommended procedures. Briefly, for cells grown on
96-well plates, growth medium was removed from the cells and each
well was washed with 200 .mu.L cold PBS. 150 .mu.L Buffer RLT was
added to each well and the plate vigorously agitated for 20
seconds. 150 .mu.L of 70% ethanol was then added to each well and
the contents mixed by pipetting three times up and down. The
samples were then transferred to the RNEASY 96.TM. well plate
attached to a QIAVAC.TM. manifold fitted with a waste collection
tray and attached to a vacuum source. Vacuum was applied for 1
minute. 500 .mu.L of Buffer RW1 was added to each well of the
RNEASY 96.TM. plate and incubated for 15 minutes and the vacuum was
again applied for 1 minute. An additional 500 .mu.L of Buffer RW1
was added to each well of the RNEASY 96.TM. plate and the vacuum
was applied for 2 minutes. 1 mL of Buffer RPE was then added to
each well of the RNEASY 96.TM. plate and the vacuum applied for a
period of 90 seconds. The Buffer RPE wash was then repeated and the
vacuum was applied for an additional 3 minutes. The plate was then
removed from the QIAVAC.TM. manifold and blotted dry on paper
towels. The plate was then re-attached to the QIAVAC.TM. manifold
fitted with a collection tube rack containing 1.2 mL collection
tubes. RNA was then eluted by pipetting 170 .mu.L water into each
well, incubating 1 minute, and then applying the vacuum for 3
minutes.
[0219] The repetitive pipetting and elution steps may be automated
using a QIAGEN Bio-Robot 9604 (Qiagen, Inc., Valencia Calif.).
Essentially, after lysing of the cells on the culture plate, the
plate is transferred to the robot deck where the pipetting, DNase
treatment and elution steps are carried out.
Example 13
Real-Time Quantitative PCR Analysis of Polo-Like Kinase mRNA
Levels
[0220] Quantitation of polo-like kinase mRNA levels was determined
by real-time quantitative PCR using the ABI PRISM.TM. 7700 Sequence
Detection System (PE-Applied Biosystems, Foster City, Calif.)
according to manufacturer's instructions. This is a closed-tube,
non-gel-based, fluorescence detection system which allows
high-throughput quantitation of polymerase chain reaction (PCR)
products in real-time. As opposed to standard PCR in which
amplification products are quantitated after the PCR is completed,
products in real-time quantitative PCR are quantitated as they
accumulate. This is accomplished by including in the PCR reaction
an oligonucleotide probe that anneals specifically between the
forward and reverse PCR primers, and contains two fluorescent dyes.
A reporter dye (e.g., FAM or JOE, obtained from either PE-Applied
Biosystems, Foster City, Calif., Operon Technologies Inc., Alameda,
Calif. or Integrated DNA Technologies Inc., Coralville, Iowa) is
attached to the 5' end of the probe and a quencher dye (e.g.,
TAMRA, obtained from either PE-Applied Biosystems, Foster City,
Calif., Operon Technologies Inc., Alameda, Calif. or Integrated DNA
Technologies Inc., Coralville, Iowa) is attached to the 3' end of
the probe. When the probe and dyes are intact, reporter dye
emission is quenched by the proximity of the 3' quencher dye.
During amplification, annealing of the probe to the target sequence
creates a substrate that can be cleaved by the 5'-exonuclease
activity of Taq polymerase. During the extension phase of the PCR
amplification cycle, cleavage of the probe by Taq polymerase
releases the reporter dye from the remainder of the probe (and
hence from the quencher moiety) and a sequence-specific fluorescent
signal is generated. With each cycle, additional reporter dye
molecules are cleaved from their respective probes, and the
fluorescence intensity is monitored at regular intervals by laser
optics built into the ABI PRISM.TM. 7700 Sequence Detection System.
In each assay, a series of parallel reactions containing serial
dilutions of mRNA from untreated control samples generates a
standard curve that is used to quantitate the percent inhibition
after antisense oligonucleotide treatment of test samples.
[0221] Prior to quantitative PCR analysis, primer-probe sets
specific to the target gene being measured are evaluated for their
ability to be "multiplexed" with a GAPDH amplification reaction. In
multiplexing, both the target gene and the internal standard gene
GAPDH are amplified concurrently in a single sample. In this
analysis, mRNA isolated from untreated cells is serially diluted.
Each dilution is amplified in the presence of primer-probe sets
specific for GAPDH only, target gene only ("single-plexing"), or
both (multiplexing). Following PCR amplification, standard curves
of GAPDH and target mRNA signal as a function of dilution are
generated from both the single-plexed and multiplexed samples. If
both the slope and correlation coefficient of the GAPDH and target
signals generated from the multiplexed samples fall within 10% of
their corresponding values generated from the single-plexed
samples, the primer-probe set specific for that target is deemed
multiplexable. Other methods of PCR are also known in the art.
[0222] PCR reagents were obtained from Invitrogen Corporation,
(Carlsbad, Calif.). RT-PCR reactions were carried out by adding 20
.mu.L PCR cocktail (2.5.times. PCR buffer (--MgCl2), 6.6 mM MgCl2,
375 .mu.M each of DATP, dCTP, dCTP and dGTP, 375 nM each of forward
primer and reverse primer, 125 nM of probe, 4 Units RNAse
inhibitor, 1.25 Units PLATINUM.RTM. Taq, 5 Units MULV reverse
transcriptase, and 2.5.times. ROX dye) to 96-well plates containing
30 .mu.L total RNA solution. The RT reaction was carried out by
incubation for 30 minutes at 48.degree. C. Following a 10 minute
incubation at 95.degree. C. to activate the PLATINUM.RTM. Taq, 40
cycles of a two-step PCR protocol were carried out: 95.degree. C.
for 15 seconds (denaturation) followed by 60.degree. C. for 1.5
minutes (annealing/extension).
[0223] Gene target quantities obtained by real time RT-PCR are
normalized using either the expression level of GAPDH, a gene whose
expression is constant, or by quantifying total RNA using
RiboGreen.TM. (Molecular Probes, Inc. Eugene, Oreg.). GAPDH
expression is quantified by real time RT-PCR, by being run
simultaneously with the target, multiplexing, or separately. Total
RNA is quantified using RiboGreen.TM. RNA quantification reagent
from Molecular Probes. Methods of RNA quantification by
RiboGreen.TM. are taught in Jones, L. J., et al, (Analytical
Biochemistry, 1998, 265, 368-374).
[0224] In this assay, 170 .mu.L of RiboGreen.TM. working reagent
(RiboGreen.TM. reagent diluted 1:350 in 10 mM Tris-HCl, 1 mM EDTA,
pH 7.5) is pipetted into a 96-well plate containing 30 .mu.L
purified, cellular RNA. The plate is read in a CytoFluor 4000 (PE
Applied Biosystems) with excitation at 480 nm and emission at 520
nm.
[0225] Probes and primers to human polo-like kinase were designed
to hybridize to a human polo-like kinase sequence, using published
sequence information (GenBank accession number U01038.1,
incorporated herein as SEQ ID NO:4). For human polo-like kinase the
PCR primers were: forward primer: CTGCCACCTCAGTGACATGCT (SEQ ID NO:
5) reverse primer: CCCACTTGCTGACCCAGAAG (SEQ ID NO: 6) and the PCR
probe was: FAM-TGCACAGTGTCAATGCCTCCAAGCC-TAMRA (SEQ ID NO: 7) where
FAM is the fluorescent dye and TAMRA is the quencher dye. For human
GAPDH the PCR primers were: forward primer: GAAGGTGAAGGTCGGAGTC(SEQ
ID NO:8) reverse primer: GAAGATGGTGATGGGATTTC (SEQ ID NO:9) and the
PCR probe was: 5' JOE-CAAGCTTCCCGTTCTCAGCC-TAMRA 3' (SEQ ID NO: 10)
where JOE is the fluorescent reporter dye and TAMRA is the quencher
dye.
Example 14
Northern Blot Analysis of Polo-Like Kinase mRNA Levels
[0226] Eighteen hours after antisense treatment, cell monolayers
were washed twice with cold PBS and lysed in 1 mL RNAZOL.TM.
(TEL-TEST "B" Inc., Friendswood, Tex.). Total RNA was prepared
following manufacturer's recommended protocols. Twenty micrograms
of total RNA was fractionated by electrophoresis through 1.2%
agarose gels containing 1.1% formaldehyde using a MOPS buffer
system (AMRESCO, Inc. Solon, Ohio). RNA was transferred from the
gel to HYBOND.TM.-N+ nylon membranes (Amersham Pharmacia Biotech,
Piscataway, N.J.) by overnight capillary transfer using a
Northern/Southern Transfer buffer system (TEL-TEST "B" Inc.,
Friendswood, Tex.). RNA transfer was confirmed by UV visualization.
Membranes were fixed by UV cross-linking using a STRATALINKER.TM.
UV Crosslinker 2400 (Stratagene, Inc, La Jolla, Calif.) and then
probed using QUICKHYB.TM. hybridization solution (Stratagene, La
Jolla, Calif.) using manufacturer's recommendations for stringent
conditions.
[0227] To detect human polo-like kinase, a human polo-like kinase
specific probe was prepared by PCR using the forward primer
CTGCCACCTCAGTGACATGCT (SEQ ID NO: 5) and the reverse primer
CCCACTTGCTGACCCAGAAG (SEQ ID NO: 6). To normalize for variations in
loading and transfer efficiency membranes were stripped and probed
for human glyceraldehyde-3-phosphate dehydrogenase (GAPDH) RNA
(Clontech, Palo Alto, Calif.).
[0228] Hybridized membranes were visualized and quantitated using a
PHOSPHORIMAGER.TM. and IMAGEQUANT.TM. Software V3.3 (Molecular
Dynamics, Sunnyvale, Calif.). Data was normalized to GAPDH levels
in untreated controls.
Example 15
Antisense Inhibition of Human Polo-Like Kinase Expression by
Chimeric Phosphorothioate Oligonucleotides having 2'-MOE Wings and
a Deoxy Gap
[0229] In accordance with the present invention, a series of
oligonucleotides were designed to target different regions of the
human polo-like kinase RNA, using published sequences (GenBank
accession number U01038.1, incorporated herein as SEQ ID NO: 4, and
GenBank accession number X90725.1, incorporated herein as SEQ ID
NO: 11). The oligonucleotides are shown in Table 1. "Target site"
indicates the first (5'-most) nucleotide number on the particular
target sequence to which the oligonucleotide binds. All compounds
in Table 1 are chimeric oligonucleotides ("gapmers") 20 nucleotides
in length, composed of a central "gap" region consisting of ten
2'-deoxynucleotides, which is flanked on both sides (5' and 3'
directions) by five-nucleotide "wings". The wings are composed of
2'-methoxyethyl (2'-MOE)nucleotides. The internucleoside (backbone)
linkages are phosphorothioate (P.dbd.S) throughout the
oligonucleotide. All cytidine residues are 5-methylcytidines. The
compounds were analyzed for their effect on human polo-like kinase
mRNA levels by quantitative real-time PCR as described in other
examples herein. Data are averages from two experiments in which
HepG2 cells were treatedc with the oligonucleotides of the present
invention. The positive control for each datapoint is identified in
the table by sequence ID number. If present, "N.D." indicates "no
data".
1TABLE 1 Inhibition of human polo-like kinase niRNA levels by
chimeric phosphorothioate oligonucleotides having 2'-MOE wings and
a deoxy gap TARGET CONTROL SEQ ID TARGET % SEQ ID SEQ ID ISIS #
REGION NO SITE SEQUENCE INHIB NO NO 121925 5'UTR 4 21
gtqgatcccagtagaggctc 0 12 1 121926 5'UTR 4 22 cgtggatcccagtagaggct
38 13 1 121927 5'UTR 4 33 tgctcagcagacgtggatcc 30 14 1 121928 Start
4 55 gctgcagtcatgttcctgga 28 15 1 Codon 121929 Coding 4 87
ccggtgcccgtggcagcttc 21 16 1 121930 Coding 4 184
gggtccactaggacctccgg 39 17 1 121931 Coding 4 189
tgcgtgggtccactaggacc 56 18 1 121932 Coding 4 194
ccggctgcgtgggtccacta 52 19 1 121933 Coding 4 222
tcaaaaggcggccccgcaca 27 20 1 121934 Coding 4 254
gatctcgaagcacttggcaa 46 21 1 121935 Coding 4 267
tgtccgcgtccgagatctcg 39 22 1 121936 Coding 4 340
gacatcttctccctctggtg 60 23 1 121937 Coding 4 344
catggacatcttctccctct 65 24 1 121938 Coding 4 415
tcgttgtcctcgaaaaagcc 72 25 1 121939 Coding 4 431
caccacgaacacgaagtcgt 57 26 1 121940 Coding 4 472
ttgtgcagctccaggagaga 58 27 1 121941 Coding 4 482
tttcctcctcttgtgcagct 0 28 1 121942 Coding 4 486
gggctttcctcctcttgtgc 39 29 1 121943 Coding 4 549
ggtgcaggtactggcagcca 66 30 1 121944 Coding 4 567
gatgaataactcggtttcgg 59 31 1 121945 Coding 4 581
cagcttgaggtctcgatgaa 60 32 1 121946 Coding 4 600
cattcaggaaaaggttgccc 57 33 1 121947 Coding 4 608
cagatcttcattcaggaaaa 39 34 1 121948 Coding 4 622
cctattttcacctccagatc 52 35 1 121949 Coding 4 627
aatcccctattttcacctcc 19 36 1 121950 Coding 4 695
gtaattaggagtcccacaca 73 37 1 121951 Coding 4 728
gtgccctttcttgctcagca 68 38 1 121952 Coding 4 745
acatccacctcgaaactgtg 70 39 1 121953 Coding 4 794
aggtggtttgcccactaaca 71 40 1 121954 Coding 4 799
tcaaaaggtggtttgcccac 66 41 1 121955 Coding 4 821
ggtctcttttaggcaagaag 61 42 1 121956 Coding 4 826
aggtaggtctcttttaggca 61 43 1 121957 Coding 4 831
tccggaggtaggtctctttt 49 44 1 121958 Coding 4 836
cttgatccggaggtaggtct 10 45 1 121959 Coding 4 859
ttgggaatactgtattcatt 65 46 1 121960 Coding 4 864
tgtgcttgggaatactgtat 60 47 1 121961 Coding 4 869
gttgatgtgcttgggaatac 48 48 1 121962 Coding 4 906
tctgaagcatcttctggatg 50 49 1 121963 Coding 4 947
attaagcagctcgttaatgg 0 50 1 121964 Coding 4 967
ccagaagtaaagaactcgtc 56 51 1 121965 Coding 4 1038
ggctgctgggagcaatcgaa 30 52 1 121966 Coding 4 1042
tccaggctgctgggagcaat 56 53 1 121967 Coding 4 1079
tttattgaggactgtgaggg 34 54 1 121968 Coding 4 1127
tggttcttctttttcccggg 52 55 1 121969 Coding 4 1144
cctgtctctcgaaccactgg 81 56 1 121970 Coding 4 1193
actgtgcagttgctgcagca 44 57 1 121971 Coding 4 1233
gcctgaccagcccacgctcc 71 58 1 121972 Coding 4 1246
tcagcctcctcttgcctgac 43 59 1 121973 Coding 4 1338
cgctgttatcacagagctga 19 60 1 121974 Coding 4 1355
attgaagagcacccccacgc 4 61 1 121975 Coding 4 1408
tctatgtactgcaggctgtc 58 62 1 121976 Coding 4 1413
cacgctctatgtactgcagg 63 63 1 121977 Coding 4 1445
ggaactcacggtgaggtagg 62 64 1 121978 Coding 4 1474
gtgatcttcttcatcaagga 47 65 1 121979 Coding 4 1504
ctcatgtaattgcggaaata 59 66 1 121980 Coding 4 1587
accaggtccgtaggtagggc 11 67 1 121981 Coding 4 1610
gatgatggcgctgcgggtgc 38 68 1 121982 Coding 4 1614
gcaggatgatggcgctgcgg 58 69 1 121983 Coding 4 1616
gtgcaggatgatggcgctgc 62 70 1 121984 Coding 4 1689
ctgccatcagtgggcacaag 58 71 1 121985 Coding 4 1727
tgtgcggaagtcccgcttct 45 72 1 121986 Coding 4 1779
ggctggccagctccttgcag 33 73 1 121987 Coding 4 1814
cagcttgtccaccatagtgc 76 74 1 121988 Coding 4 1842
gacggttgctggccgagcgt 4 75 1 121989 Coding 4 1843
agacggttgctggccgagcg 41 76 1 121990 Stop 4 1865
gggcagctattaggaggcct 79 77 1 Codon 121991 3'UTR 4 1919
cagtatgggccccagatgca 43 78 1 121992 3'UTR 4 1949
cactgcagacatggcaccgc 67 79 1 121993 3'UTR 4 2031
aacatgtacaaaaataactt 16 80 1 121994 3'UTR 4 2108
attcaatagaaatattctgt 25 81 1 121995 3'UTR 4 2156
attcacatctgtttaatgtg 59 82 1 121996 3'UTR 4 2159
aatattcacatctgtttaat 21 83 1 121997 5'UTR 11 3897
gagcagagcctccgcaaccg 40 84 1 121998 3'UTR 11 4426
tcccttgctgggtactcttt 47 85 1 121999 3'UTR 11 4430
gctctcccttgctgggtact 37 86 1 122000 3'UTR 11 4447
gcagctccaagtcccaggct 49 87 1 122001 3'UTR 11 4522
agctcccagagccaagaagc 56 88 1 122002 3'UTR 11 4565
aacatgactcagactccact 62 89 1
[0230] As shown in Table 1, SEQ ID NOs 18, 19, 23, 24, 25, 26, 27,
30, 31, 32, 33, 35, 37, 38, 39, 40, 41, 42, 43, 46, 47, 49, 51, 53,
55, 56, 58, 62, 63, 64, 66, 69, 70, 71, 74, 77, 79, 82, 88 and 89
demonstrated at least 50% inhibition of human polo-like kinase
expression in this assay and are therefore preferred. The target
sites to which these preferred sequences are complementary are
herein referred to as "preferred target regions" and are therefore
preferred sites for targeting by compounds of the present
invention. These preferred target regions are shown in Table 2. The
sequences represent the reverse complement of the preferred
antisense compounds shown in Table 1. "Target site" indicates the
first (5'-most) nucleotide number of the corresponding target
nucleic acid. Also shown in Table 2 is the species in which each of
the preferred target regions was found.
2TABLE 2 Sequence and position of preferred target regions
identified in polo-like kinase. TARGET SEQ ID TARGET REV COMP SEQ
ID SITEID NO SITE SEQUENCE OF SEQ ID ACTIVE IN NO 30986 4 189
ggtcctagtggacccacgca 18 H. sapiens 90 30987 4 194
tagtggacccacgcagccgg 19 H. sapiens 91 30991 4 340
caccagagggagaagatgtc 23 H. sapiens 92 30992 4 344
agagggagaagatgtccatg 24 H. sapiens 93 30993 4 415
ggctttttcgaggacaacga 25 H. sapiens 94 30994 4 431
acgacttcgtgttcgtggtg 26 H. sapiens 95 30995 4 472
tctctcctggagctgcacaa 27 H. sapiens 96 30998 4 549
tggctgccagtacctgcacc 30 H. sapiens 97 30999 4 567
ccgaaaccgagttattcatc 31 H. sapiens 98 31000 4 581
ttcatcgagacctcaagctg 32 H. sapiens 99 31001 4 600
gggcaaccttttcctgaatg 33 H. sapiens 100 31003 4 622
gatctggaggtgaaaatagg 35 H. sapiens 101 31005 4 695
tgtgtgggactcctaattac 37 H. sapiens 102 31006 4 728
tgctgagcaagaaagggcac 38 H. sapiens 103 31007 4 745
cacagtttcgaggtggatgt 39 H. sapiens 104 31008 4 794
tgttagtgggcaaaccacct 40 H. sapiens 105 31009 4 799
gtgggcaaaccaccttttga 41 H. sapiens 106 31010 4 821
cttcttgcctaaaagagacc 42 H. sapiens 107 31011 4 826
tgcctaaaagagacctacct 43 H. sapiens 108 31014 4 859
aatgaatacagtattcccaa 46 H. sapiens 109 31015 4 864
atacagtattcccaagcaca 47 H. sapiens 110 31017 4 906
catccagaagatgcttcaga 49 H. sapiens 111 31019 4 967
gacgagttctttacttctgg 51 H. sapiens 112 31021 4 1042
attgctcccagcagcctgga 53 H. sapiens 113 31023 4 1127
cccgggaaaaagaagaacca 55 H. sapiens 114 31024 4 1144
ccagtggttcgagagacagg 56 H. sapiens 115 31026 4 1233
ggagcgtgggctggtcaggc 58 H. sapiens 116 31030 4 1408
gacagcctgcagtacataga 62 H. sapiens 117 31031 4 1413
cctgcagtacatagagcgtg 63 H. sapiens 118 31032 4 1445
cctacctcaccgtgagttcc 64 H. sapiens 119 31034 4 1504
tatttccgcaattacatgag 66 H. sapiens 120 31037 4 1614
ccgcagcgccatcatcctgc 69 H. sapiens 121 31038 4 1616
gcagcgccatcatcctgcac 70 H. sapiens 122 31039 4 1689
cttgtgcccactgatggcag 71 H. sapiens 123 31042 4 1814
gcactatggtggacaagctg 74 H. sapiens 124 31045 4 1865
aggcctcctaatagctgccc 77 H. sapiens 125 31047 4 1949
gcggtgccatgtctgcagtg 79 H. sapiens 126 31050 4 2156
cacattaaacagatgtgaat 82 H. sapiens 127 31056 11 4522
gcttcttggctctgggagct 88 H. sapiens 128 31057 11 4565
agtggagtctgagtcatgtt 89 H. sapiens 129
[0231] As these "preferred target regions" have been found by
experimentation to be open to, and accessible for, hybridization
with the antisense compounds of the present invention, one of skill
in the art will recognize or be able to ascertain, using no more
than routine experimentation, further embodiments of the invention
that encompass other compounds that specifically hybridize to these
sites and consequently inhibit the expression of polo-like
kinase.
[0232] In one embodiment, the "preferred target region" may be
employed in screening candidate antisense compounds. "Candidate
antisense compounds" are those that inhibit the expression of a
nucleic acid molecule encoding polo-like kinase and which comprise
at least an 8-nucleobase portion which is complementary to a
preferred target region. The method comprises the steps of
contacting a preferred target region of a nucleic acid molecule
encoding polo-like kinase with one or more candidate antisense
compounds, and selecting for one or more candidate antisense
compounds which inhibit the expression of a nucleic acid molecule
encoding polo-like kinase. Once it is shown that the candidate
antisense compound or compounds are capable of inhibiting the
expression of a nucleic acid molecule encoding polo-like kinase,
the candidate antisense compound may be employed as an antisense
compound in accordance with the present invention.
[0233] According to the present invention, antisense compounds
include ribozymes, external guide sequence (EGS) oligonucleotides
(oligozymes), and other short catalytic RNAs or catalytic
oligonucleotides which hybridize to the target nucleic acid and
modulate its expression.
Example 16
Western Blot Analysis of Polo-Like Kinase Protein Levels
[0234] Western blot analysis (immunoblot analysis) is carried out
using standard methods. Cells are harvested 16-20 h after
oligonucleotide treatment, washed once with PBS, suspended in
Laemmli buffer (100 ul/well), boiled for 5 minutes and loaded on a
16% SDS-PAGE gel. Gels are run for 1.5 hours at 150 V, and
transferred to membrane for western blotting. Appropriate primary
antibody directed to polo-like kinase is used, with a radiolabeled
or fluorescently labeled secondary antibody directed against the
primary antibody species. Bands are visualized using a
PHOSPHORIMAGER.TM. (Molecular Dynamics, Sunnyvale Calif.).
Sequence CWU 1
1
129 1 20 DNA Artificial Sequence Antisense Oligonucleotide 1
tccgtcatcg ctcctcaggg 20 2 20 DNA Artificial Sequence Antisense
Oligonucleotide 2 gtgcgcgcga gcccgaaatc 20 3 20 DNA Artificial
Sequence Antisense Oligonucleotide 3 atgcattctg cccccaagga 20 4
2190 DNA H. sapiens CDS (64)...(1875) 4 gggaggagcg gagaggtgcg
gagcctctac tgggatccac gtctgctgag cagctccagg 60 aac atg act gca gcg
gtg act gcg ggg aag ctg cca cgg gca ccg gcc 108 Met Thr Ala Ala Val
Thr Ala Gly Lys Leu Pro Arg Ala Pro Ala 1 5 10 15 gac cct ggg aaa
gcc ggg gtc ccc gga gtt gca gct ccc gga gct ccg 156 Asp Pro Gly Lys
Ala Gly Val Pro Gly Val Ala Ala Pro Gly Ala Pro 20 25 30 gcg gcg
gct cca ccg gcg aaa gag atc ccg gag gtc cta gtg gac cca 204 Ala Ala
Ala Pro Pro Ala Lys Glu Ile Pro Glu Val Leu Val Asp Pro 35 40 45
cgc agc cgg cgg cgc tat gtg cgg ggc cgc ctt ttg agc aag ggc ggc 252
Arg Ser Arg Arg Arg Tyr Val Arg Gly Arg Leu Leu Ser Lys Gly Gly 50
55 60 ttt gcc aag tgc ttc gag atc tcg gac gcg gac acc aag gag gtg
ttc 300 Phe Ala Lys Cys Phe Glu Ile Ser Asp Ala Asp Thr Lys Glu Val
Phe 65 70 75 gcg ggc aag att gtg cct aag tct ctg ctg ctc aag ccg
cac cag agg 348 Ala Gly Lys Ile Val Pro Lys Ser Leu Leu Leu Lys Pro
His Gln Arg 80 85 90 95 gag aag atg tcc atg gaa ata tcc att cac cgc
agc ctc gcc cac cag 396 Glu Lys Met Ser Met Glu Ile Ser Ile His Arg
Ser Leu Ala His Gln 100 105 110 cac gtc gta gga ttc cac ggc ttt ttc
gag gac aac gac ttc gtg ttc 444 His Val Val Gly Phe His Gly Phe Phe
Glu Asp Asn Asp Phe Val Phe 115 120 125 gtg gtg ttg gag ctc tgc cgc
cgg agg tct ctc ctg gag ctg cac aag 492 Val Val Leu Glu Leu Cys Arg
Arg Arg Ser Leu Leu Glu Leu His Lys 130 135 140 agg agg aaa gcc ctg
act gag cct gag gcc cga tac tac cta cgg caa 540 Arg Arg Lys Ala Leu
Thr Glu Pro Glu Ala Arg Tyr Tyr Leu Arg Gln 145 150 155 att gtg ctt
ggc tgc cag tac ctg cac cga aac cga gtt att cat cga 588 Ile Val Leu
Gly Cys Gln Tyr Leu His Arg Asn Arg Val Ile His Arg 160 165 170 175
gac ctc aag ctg ggc aac ctt ttc ctg aat gaa gat ctg gag gtg aaa 636
Asp Leu Lys Leu Gly Asn Leu Phe Leu Asn Glu Asp Leu Glu Val Lys 180
185 190 ata ggg gat ttt gga ctg gca acc aaa gtc gaa tat gac ggg gag
agg 684 Ile Gly Asp Phe Gly Leu Ala Thr Lys Val Glu Tyr Asp Gly Glu
Arg 195 200 205 aag aag acc ctg tgt ggg act cct aat tac ata gct ccc
gag gtg ctg 732 Lys Lys Thr Leu Cys Gly Thr Pro Asn Tyr Ile Ala Pro
Glu Val Leu 210 215 220 agc aag aaa ggg cac agt ttc gag gtg gat gtg
tgg tcc att ggg tgt 780 Ser Lys Lys Gly His Ser Phe Glu Val Asp Val
Trp Ser Ile Gly Cys 225 230 235 atc atg tat acc ttg tta gtg ggc aaa
cca cct ttt gag act tct tgc 828 Ile Met Tyr Thr Leu Leu Val Gly Lys
Pro Pro Phe Glu Thr Ser Cys 240 245 250 255 cta aaa gag acc tac ctc
cgg atc aag aag aat gaa tac agt att ccc 876 Leu Lys Glu Thr Tyr Leu
Arg Ile Lys Lys Asn Glu Tyr Ser Ile Pro 260 265 270 aag cac atc aac
ccc gtg gcc gcc tcc ctc atc cag aag atg ctt cag 924 Lys His Ile Asn
Pro Val Ala Ala Ser Leu Ile Gln Lys Met Leu Gln 275 280 285 aca gat
ccc act gcc cgc cca acc att aac gag ctg ctt aat gac gag 972 Thr Asp
Pro Thr Ala Arg Pro Thr Ile Asn Glu Leu Leu Asn Asp Glu 290 295 300
ttc ttt act tct ggc tat atc cct gcc cgt ctc ccc atc acc tgc ctg
1020 Phe Phe Thr Ser Gly Tyr Ile Pro Ala Arg Leu Pro Ile Thr Cys
Leu 305 310 315 acc att cca cca agg ttt tcg att gct ccc agc agc ctg
gac ccc agc 1068 Thr Ile Pro Pro Arg Phe Ser Ile Ala Pro Ser Ser
Leu Asp Pro Ser 320 325 330 335 aac cgg aag ccc ctc aca gtc ctc aat
aaa ggc ttg gag aac ccc ctg 1116 Asn Arg Lys Pro Leu Thr Val Leu
Asn Lys Gly Leu Glu Asn Pro Leu 340 345 350 cct gag cgt ccc cgg gaa
aaa gaa gaa cca gtg gtt cga gag aca ggt 1164 Pro Glu Arg Pro Arg
Glu Lys Glu Glu Pro Val Val Arg Glu Thr Gly 355 360 365 gag gtg gtc
gac tgc cac ctc agt gac atg ctg cag caa ctg cac agt 1212 Glu Val
Val Asp Cys His Leu Ser Asp Met Leu Gln Gln Leu His Ser 370 375 380
gtc aat gcc tcc aag ccc tcg gag cgt ggg ctg gtc agg caa gag gag
1260 Val Asn Ala Ser Lys Pro Ser Glu Arg Gly Leu Val Arg Gln Glu
Glu 385 390 395 gct gag gat cct gcc tgc atc ccc atc ttc tgg gtc agc
aag tgg gtg 1308 Ala Glu Asp Pro Ala Cys Ile Pro Ile Phe Trp Val
Ser Lys Trp Val 400 405 410 415 gac tat tcg gac aag tac ggc ctt ggg
tat cag ctc tgt gat aac agc 1356 Asp Tyr Ser Asp Lys Tyr Gly Leu
Gly Tyr Gln Leu Cys Asp Asn Ser 420 425 430 gtg ggg gtg ctc ttc aat
gac tca aca cgc ctc atc ctc tac aat gat 1404 Val Gly Val Leu Phe
Asn Asp Ser Thr Arg Leu Ile Leu Tyr Asn Asp 435 440 445 ggt gac agc
ctg cag tac ata gag cgt gac ggc act gag tcc tac ctc 1452 Gly Asp
Ser Leu Gln Tyr Ile Glu Arg Asp Gly Thr Glu Ser Tyr Leu 450 455 460
acc gtg agt tcc cat ccc aac tcc ttg atg aag aag atc acc ctc ctt
1500 Thr Val Ser Ser His Pro Asn Ser Leu Met Lys Lys Ile Thr Leu
Leu 465 470 475 aaa tat ttc cgc aat tac atg agc gag cac ttg ctg aag
gca ggt gcc 1548 Lys Tyr Phe Arg Asn Tyr Met Ser Glu His Leu Leu
Lys Ala Gly Ala 480 485 490 495 aac atc acg ccg cgc gaa ggt gat gag
ctc gcc cgg ctg ccc tac cta 1596 Asn Ile Thr Pro Arg Glu Gly Asp
Glu Leu Ala Arg Leu Pro Tyr Leu 500 505 510 cgg acc tgg ttc cgc acc
cgc agc gcc atc atc ctg cac ctc agc aac 1644 Arg Thr Trp Phe Arg
Thr Arg Ser Ala Ile Ile Leu His Leu Ser Asn 515 520 525 ggc agc gtg
cag atc aac ttc ttc cag gat cac acc aag ctc atc ttg 1692 Gly Ser
Val Gln Ile Asn Phe Phe Gln Asp His Thr Lys Leu Ile Leu 530 535 540
tgc cca ctg atg gca gcc gtg acc tac atc gac gag aag cgg gac ttc
1740 Cys Pro Leu Met Ala Ala Val Thr Tyr Ile Asp Glu Lys Arg Asp
Phe 545 550 555 cgc aca tac cgc ctg agt ctc ctg gag gag tac ggc tgc
tgc aag gag 1788 Arg Thr Tyr Arg Leu Ser Leu Leu Glu Glu Tyr Gly
Cys Cys Lys Glu 560 565 570 575 ctg gcc agc cgg ctc cgc tac gcc cgc
act atg gtg gac aag ctg ctg 1836 Leu Ala Ser Arg Leu Arg Tyr Ala
Arg Thr Met Val Asp Lys Leu Leu 580 585 590 agc tca cgc tcg gcc agc
aac cgt ctc aag gcc tcc taa tagctgccct 1885 Ser Ser Arg Ser Ala Ser
Asn Arg Leu Lys Ala Ser 595 600 cccctccgga ctggtgccct cctcactccc
acctgcatct ggggcccata ctggttggct 1945 cccgcggtgc catgtctgca
gtgtgccccc cagccccggt ggctgggcag agctgcatca 2005 tccttgcagg
tgggggttgc tgtataagtt atttttgtac atgttcgggt gtgggttcta 2065
cagccttgtc cccctccccc tcaaccccac catatgaatt gtacagaata tttctattga
2125 attcggaact gtcctttcct tggctttatg cacattaaac agatgtgaat
attaaaaaaa 2185 aaaaa 2190 5 21 DNA Artificial Sequence PCR Primer
5 ctgccacctc agtgacatgc t 21 6 20 DNA Artificial Sequence PCR
Primer 6 cccacttgct gacccagaag 20 7 25 DNA Artificial Sequence PCR
Probe 7 tgcacagtgt caatgcctcc aagcc 25 8 19 DNA Artificial Sequence
PCR Primer 8 gaaggtgaag gtcggagtc 19 9 20 DNA Artificial Sequence
PCR Primer 9 gaagatggtg atgggatttc 20 10 20 DNA Artificial Sequence
PCR Probe 10 caagcttccc gttctcagcc 20 11 4646 DNA H. sapiens CDS
(3948)...(4355) 11 gtctgtgtcc taatcttctc ttttaatggg gataccactc
aggttggatt agggcccatc 60 ctaacaatcc cattttaact tagttacctc
ttcagggcct atcttcaaat atactcacat 120 tttgaggtac aggtagatgg
ttagggcttc agcatgaatt tttgtgggga cataattcaa 180 ccctccacac
ataattacca atttctgaat gtctttctgg ttaagttgca taaaaacgtt 240
tatctacttg aactctagga tgatagttaa aaaaaaaaat gttggccagg cgcagtgatg
300 gatgcatatg atcccagcac tttgggaggc cgaggtgggc agattgcttg
agttcaggag 360 ttcaagacca gcctggcaac atggtgaaat cctgtgtcta
caaaaaatgc aaaaattagc 420 tggacatgat ggcatgtgcc tttggttcca
gctacttagg aggctgaggt aggaggatgg 480 cttgagccca ggaggcggag
gttgcagtga gccaaaatcg tgccaccgca ctctagcctg 540 ggcaacagag
ccagaccata tctcaaaaaa aaaaaaaaaa agtttatcta caaaaatgct 600
tttgtgcctc ttacatacaa cccttccaga ggaaaggcct agctgagagt aagagatggt
660 tgaaaaaaat gcaatgttat gattgctgaa cagggcacga ctgtttttgt
aattttggag 720 aaaataatta aagcctggca cctggggagg cttgatccct
ggaagcctcc tcttgctgaa 780 ggaaaattcc cagtgctgcc tttccatgtg
ctgtgagtgc tttgagttca gactgacaac 840 agagtgggtc tagcttctat
gctttccatg aagatctccc acaaatgtca tccatgctca 900 tgagatggat
caacttgtat cctgaacaag caaaactgtt tgggactcac tgccttcagg 960
cagtcccttg gaagccaagg actctgggaa cttttcagat gggactggaa acacttgggc
1020 aggagttccc ctggtaggag gtctgttcac ctgtacagcc taatggatgt
cctgcttgag 1080 gtgccctaat attgcaaatt ctttgtttac aggggtacca
cctgtgcccc tgggactgtg 1140 cttctgtaca tgaccacaac tctcatgatg
tcccctcagc cctggaaagc atttgggtta 1200 gcttccgctt actggtcaga
gttatactgt gcctgaattg atgcctcagg tcaggttgaa 1260 aaaaaaaaaa
aaggttcaga cagcaattaa gggctgggca cggtggctca tgcctgtaat 1320
cccgacactt tgggaggctg aggtgggcag atcacctgag gtcaggagtt tgagaccagc
1380 ctgaccgaca tggtgaaaag taaaaataca aaaataaaaa aattagctgg
gtgtggtggt 1440 gtgcacctgt agtcccagct actcgggagg ctgaggcagg
agaatcgctt gaacccagga 1500 ggtggaggct gcagtgagcc aagatcacgc
cactgcactc cagcctgggt gacagagcaa 1560 gactccatct caacaacaac
aacaaaaagg aattaaggag gaagccacct ggcttcctaa 1620 gatagacttt
atggttaatg ggatttattt tagctggtta agtccaggac ccctaccagg 1680
aagaactgag gtccatattt gaggttggtc tcaccctttt gcatgtggtc ctactaataa
1740 taattttgct gtaaagaagc ctcaataagg agatggactg tgtgaaaaga
gatgagaaag 1800 caggcctgtt tgcaaggctg gcccttggct ggcatctgaa
agcttggatt tcaggagggt 1860 tctcattact ccctaaatga taagagtggc
tcactgtgcc taaactgttc gtacaaacaa 1920 tgtgggttat gcccaacatc
tgctttcctt ctgggagtca gattttcata tgtgttaggc 1980 agaggatgag
gtgagcagct cccaatgaga accctgaaca ctgagtctgt aatgagcttc 2040
ccttgtatac aacattgcac atgggttgtc acaactgatt gctggaggaa ttgtgtccta
2100 tgtgactctg ctgggagagg actgtgggag gcttacacct ggtttccctg
gactttgtcc 2160 atgcgctttt ttcctttgct gattttgctt cctagccttt
cgctgtagta aaacatagcc 2220 atgagtatga ctacaggctg agtctgtgaa
tctcctagta catcatcaga ctaggaggtg 2280 gtggtgttgg caccccccag
cacagggcac aagggagact tgcagggtgt ttgtcatgtt 2340 ccctttctca
atctgggtgt ggtttacaga tttgttcagt ttgtgaaaat tcactgagct 2400
ctatgaacaa ttataatatg tacatttttt tctgtaagtg tattaaattt caataaaaag
2460 aattcacact ataggggtac aaaataactt aatttttcaa agtcttcctt
ttattcagcc 2520 aacattttag taagtaccct ttttttttta ccaagcactg
ctctgggagc ttgggacatg 2580 gggtagaaag gacggcatca ttgtcctcat
tgtccttcag cttagctgca aggcaggtga 2640 aggatgctta tagtatggtt
gatttttgct gggctctatg aaggatcaga gggtgctaag 2700 gaggcacaga
gaaagagctt ttaacgtggg tattttactg ttccagggtt gccactcaag 2760
tacctacaga acaaacgggt gtagctgtaa actgtggcaa actgaaagca tgtaggcaca
2820 gagtaagtag ctagagctga tttttttcag gaaaggccac aaatcccaac
ttttatgagc 2880 tcctctttta aatgctgtaa atgttttaca atggcggggc
gcggtggctc acgcctgtaa 2940 tcccagcatt tgggaggccg aggggcagat
cacttgaggt caggagttca agaccagcct 3000 ggccaacatg gtgaaacctc
ttctctacta aaattacaaa aattagccgg gcatggtggt 3060 gcatgcttgt
aattccagct gctagggagg ccgaggcggg aggattgctt gaacccggga 3120
agcagaggtt gcagtgagct gagatcgtgc cactgcactc cagcctgggc gacagagcaa
3180 gattccgtca cacacacaaa aaaaaggcgt ggggggaggc caaacaaaac
cccgcaagac 3240 acatttggct atgacctgcc agtttgctag gcattcttcc
aaccttccct ccctctgacc 3300 aagaaactga gtgtccacta ttttaggccc
tgggaaattc agtagcgagg aggccagaca 3360 gcttcgttgc atcatggggg
gctctggtac tgtgcttctc caacttcagg atgtgtagga 3420 atcacctgag
cagtcttgtt gagaggcgga cactgactcg ggaggtctgg ggtagggcct 3480
gaacgtttgc ctttgcggtt ctaacaagct ctcaggtgat ggcgatgcta ctgttccctg
3540 gccccgaggt agaggaagat ttaagtaaaa gcttcctgga ggaggcgcaa
gtgaaccgca 3600 ggagctttcc cggacgcccg agaagggaga aaccccgaag
gaattcctcc tctctcgggg 3660 ctgggtctcc gcatccacgc cgggtttggt
ttcccaggct atcccacgtg ttcgggcgtc 3720 cgtgtcaatc aggttttccc
cggctgggtc cgggtttaaa ggctgctgct gcgcagggcg 3780 ctcccatggt
gccgcgcggc gggcgggttt ggattttaaa tccccgcggc caatcagtgg 3840
cgcgcaggct tttgtaacgt tcccagcgcc gcgtttgaat tcggggagga gcggagcggt
3900 tgcggaggct ctgctcggat cgaggtctgc agcgcagctt cgggagc atg agt
gct 3956 Met Ser Ala 1 gca gtg act gca ggg aag ctg gca cgg gca ccg
gcc gac cct ggg aaa 4004 Ala Val Thr Ala Gly Lys Leu Ala Arg Ala
Pro Ala Asp Pro Gly Lys 5 10 15 gcc ggg gtc ccc gga gtt gca gct ccc
gga gct ccg gcg gcg gct cca 4052 Ala Gly Val Pro Gly Val Ala Ala
Pro Gly Ala Pro Ala Ala Ala Pro 20 25 30 35 ccg gcg aaa gag atc ccg
gag gtc cta gtg gac cca cgc agc cgg cgg 4100 Pro Ala Lys Glu Ile
Pro Glu Val Leu Val Asp Pro Arg Ser Arg Arg 40 45 50 cgc tat gtg
cgg ggc cgc ttt ttg ggc aag ggc ggc ttt gcc aag tgc 4148 Arg Tyr
Val Arg Gly Arg Phe Leu Gly Lys Gly Gly Phe Ala Lys Cys 55 60 65
ttc gag atc tcg gac gcg gac acc aag gag gtg ttc gcg ggc aag att
4196 Phe Glu Ile Ser Asp Ala Asp Thr Lys Glu Val Phe Ala Gly Lys
Ile 70 75 80 gtg cct aag tct ctg ctg ctc aag ccg cac cag agg gag
aag atg tcc 4244 Val Pro Lys Ser Leu Leu Leu Lys Pro His Gln Arg
Glu Lys Met Ser 85 90 95 atg gaa ata tcc att cac cgc agc ctc gcc
cac cag cac gtc gta gga 4292 Met Glu Ile Ser Ile His Arg Ser Leu
Ala His Gln His Val Val Gly 100 105 110 115 ttc cac ggc ttt ttc gag
gac acc gac ttc gtg ttc gtg gtg ttg gag 4340 Phe His Gly Phe Phe
Glu Asp Thr Asp Phe Val Phe Val Val Leu Glu 120 125 130 ctc tgc cgc
cgg agg gtgagtgtcg ctgctgggga actggaactg cctgcggggc 4395 Leu Cys
Arg Arg Arg 135 agttggagcg cccagacctg gagctgctgg aaagagtacc
cagcaaggga gagcctggga 4455 cttggagctg ctagagaagg gtgctgggag
cctcccgctt acgtatggaa agtgtctttg 4515 gtaagggctt cttggctctg
ggagctgcta gaggaggggg ttccagtgaa gtggagtctg 4575 agtcatgttg
ctgataggga agtcagcttc tggacgcgag gtgctggggg gaggggtgct 4635
ggtaatggac g 4646 12 20 DNA Artificial Sequence Antisense
Oligonucleotide 12 gtggatccca gtagaggctc 20 13 20 DNA Artificial
Sequence Antisense Oligonucleotide 13 cgtggatccc agtagaggct 20 14
20 DNA Artificial Sequence Antisense Oligonucleotide 14 tgctcagcag
acgtggatcc 20 15 20 DNA Artificial Sequence Antisense
Oligonucleotide 15 gctgcagtca tgttcctgga 20 16 20 DNA Artificial
Sequence Antisense Oligonucleotide 16 ccggtgcccg tggcagcttc 20 17
20 DNA Artificial Sequence Antisense Oligonucleotide 17 gggtccacta
ggacctccgg 20 18 20 DNA Artificial Sequence Antisense
Oligonucleotide 18 tgcgtgggtc cactaggacc 20 19 20 DNA Artificial
Sequence Antisense Oligonucleotide 19 ccggctgcgt gggtccacta 20 20
20 DNA Artificial Sequence Antisense Oligonucleotide 20 tcaaaaggcg
gccccgcaca 20 21 20 DNA Artificial Sequence Antisense
Oligonucleotide 21 gatctcgaag cacttggcaa 20 22 20 DNA Artificial
Sequence Antisense Oligonucleotide 22 tgtccgcgtc cgagatctcg 20 23
20 DNA Artificial Sequence Antisense Oligonucleotide 23 gacatcttct
ccctctggtg 20 24 20 DNA Artificial Sequence Antisense
Oligonucleotide 24 catggacatc ttctccctct 20 25 20 DNA Artificial
Sequence Antisense Oligonucleotide 25 tcgttgtcct cgaaaaagcc 20 26
20 DNA Artificial Sequence Antisense Oligonucleotide 26 caccacgaac
acgaagtcgt 20 27 20 DNA Artificial Sequence Antisense
Oligonucleotide 27 ttgtgcagct ccaggagaga 20 28 20 DNA Artificial
Sequence Antisense
Oligonucleotide 28 tttcctcctc ttgtgcagct 20 29 20 DNA Artificial
Sequence Antisense Oligonucleotide 29 gggctttcct cctcttgtgc 20 30
20 DNA Artificial Sequence Antisense Oligonucleotide 30 ggtgcaggta
ctggcagcca 20 31 20 DNA Artificial Sequence Antisense
Oligonucleotide 31 gatgaataac tcggtttcgg 20 32 20 DNA Artificial
Sequence Antisense Oligonucleotide 32 cagcttgagg tctcgatgaa 20 33
20 DNA Artificial Sequence Antisense Oligonucleotide 33 cattcaggaa
aaggttgccc 20 34 20 DNA Artificial Sequence Antisense
Oligonucleotide 34 cagatcttca ttcaggaaaa 20 35 20 DNA Artificial
Sequence Antisense Oligonucleotide 35 cctattttca cctccagatc 20 36
20 DNA Artificial Sequence Antisense Oligonucleotide 36 aatcccctat
tttcacctcc 20 37 20 DNA Artificial Sequence Antisense
Oligonucleotide 37 gtaattagga gtcccacaca 20 38 20 DNA Artificial
Sequence Antisense Oligonucleotide 38 gtgccctttc ttgctcagca 20 39
20 DNA Artificial Sequence Antisense Oligonucleotide 39 acatccacct
cgaaactgtg 20 40 20 DNA Artificial Sequence Antisense
Oligonucleotide 40 aggtggtttg cccactaaca 20 41 20 DNA Artificial
Sequence Antisense Oligonucleotide 41 tcaaaaggtg gtttgcccac 20 42
20 DNA Artificial Sequence Antisense Oligonucleotide 42 ggtctctttt
aggcaagaag 20 43 20 DNA Artificial Sequence Antisense
Oligonucleotide 43 aggtaggtct cttttaggca 20 44 20 DNA Artificial
Sequence Antisense Oligonucleotide 44 tccggaggta ggtctctttt 20 45
20 DNA Artificial Sequence Antisense Oligonucleotide 45 cttgatccgg
aggtaggtct 20 46 20 DNA Artificial Sequence Antisense
Oligonucleotide 46 ttgggaatac tgtattcatt 20 47 20 DNA Artificial
Sequence Antisense Oligonucleotide 47 tgtgcttggg aatactgtat 20 48
20 DNA Artificial Sequence Antisense Oligonucleotide 48 gttgatgtgc
ttgggaatac 20 49 20 DNA Artificial Sequence Antisense
Oligonucleotide 49 tctgaagcat cttctggatg 20 50 20 DNA Artificial
Sequence Antisense Oligonucleotide 50 attaagcagc tcgttaatgg 20 51
20 DNA Artificial Sequence Antisense Oligonucleotide 51 ccagaagtaa
agaactcgtc 20 52 20 DNA Artificial Sequence Antisense
Oligonucleotide 52 ggctgctggg agcaatcgaa 20 53 20 DNA Artificial
Sequence Antisense Oligonucleotide 53 tccaggctgc tgggagcaat 20 54
20 DNA Artificial Sequence Antisense Oligonucleotide 54 tttattgagg
actgtgaggg 20 55 20 DNA Artificial Sequence Antisense
Oligonucleotide 55 tggttcttct ttttcccggg 20 56 20 DNA Artificial
Sequence Antisense Oligonucleotide 56 cctgtctctc gaaccactgg 20 57
20 DNA Artificial Sequence Antisense Oligonucleotide 57 actgtgcagt
tgctgcagca 20 58 20 DNA Artificial Sequence Antisense
Oligonucleotide 58 gcctgaccag cccacgctcc 20 59 20 DNA Artificial
Sequence Antisense Oligonucleotide 59 tcagcctcct cttgcctgac 20 60
20 DNA Artificial Sequence Antisense Oligonucleotide 60 cgctgttatc
acagagctga 20 61 20 DNA Artificial Sequence Antisense
Oligonucleotide 61 attgaagagc acccccacgc 20 62 20 DNA Artificial
Sequence Antisense Oligonucleotide 62 tctatgtact gcaggctgtc 20 63
20 DNA Artificial Sequence Antisense Oligonucleotide 63 cacgctctat
gtactgcagg 20 64 20 DNA Artificial Sequence Antisense
Oligonucleotide 64 ggaactcacg gtgaggtagg 20 65 20 DNA Artificial
Sequence Antisense Oligonucleotide 65 gtgatcttct tcatcaagga 20 66
20 DNA Artificial Sequence Antisense Oligonucleotide 66 ctcatgtaat
tgcggaaata 20 67 20 DNA Artificial Sequence Antisense
Oligonucleotide 67 accaggtccg taggtagggc 20 68 20 DNA Artificial
Sequence Antisense Oligonucleotide 68 gatgatggcg ctgcgggtgc 20 69
20 DNA Artificial Sequence Antisense Oligonucleotide 69 gcaggatgat
ggcgctgcgg 20 70 20 DNA Artificial Sequence Antisense
Oligonucleotide 70 gtgcaggatg atggcgctgc 20 71 20 DNA Artificial
Sequence Antisense Oligonucleotide 71 ctgccatcag tgggcacaag 20 72
20 DNA Artificial Sequence Antisense Oligonucleotide 72 tgtgcggaag
tcccgcttct 20 73 20 DNA Artificial Sequence Antisense
Oligonucleotide 73 ggctggccag ctccttgcag 20 74 20 DNA Artificial
Sequence Antisense Oligonucleotide 74 cagcttgtcc accatagtgc 20 75
20 DNA Artificial Sequence Antisense Oligonucleotide 75 gacggttgct
ggccgagcgt 20 76 20 DNA Artificial Sequence Antisense
Oligonucleotide 76 agacggttgc tggccgagcg 20 77 20 DNA Artificial
Sequence Antisense Oligonucleotide 77 gggcagctat taggaggcct 20 78
20 DNA Artificial Sequence Antisense Oligonucleotide 78 cagtatgggc
cccagatgca 20 79 20 DNA Artificial Sequence Antisense
Oligonucleotide 79 cactgcagac atggcaccgc 20 80 20 DNA Artificial
Sequence Antisense Oligonucleotide 80 aacatgtaca aaaataactt 20 81
20 DNA Artificial Sequence Antisense Oligonucleotide 81 attcaataga
aatattctgt 20 82 20 DNA Artificial Sequence Antisense
Oligonucleotide 82 attcacatct gtttaatgtg 20 83 20 DNA Artificial
Sequence Antisense Oligonucleotide 83 aatattcaca tctgtttaat 20 84
20 DNA Artificial Sequence Antisense Oligonucleotide 84 gagcagagcc
tccgcaaccg 20 85 20 DNA Artificial Sequence Antisense
Oligonucleotide 85 tcccttgctg ggtactcttt 20 86 20 DNA Artificial
Sequence Antisense Oligonucleotide 86 gctctccctt gctgggtact 20 87
20 DNA Artificial Sequence Antisense Oligonucleotide 87 gcagctccaa
gtcccaggct 20 88 20 DNA Artificial Sequence Antisense
Oligonucleotide 88 agctcccaga gccaagaagc 20 89 20 DNA Artificial
Sequence Antisense Oligonucleotide 89 aacatgactc agactccact 20 90
20 DNA H. sapiens 90 ggtcctagtg gacccacgca 20 91 20 DNA H. sapiens
91 tagtggaccc acgcagccgg 20 92 20 DNA H. sapiens 92 caccagaggg
agaagatgtc 20 93 20 DNA H. sapiens 93 agagggagaa gatgtccatg 20 94
20 DNA H. sapiens 94 ggctttttcg aggacaacga 20 95 20 DNA H. sapiens
95 acgacttcgt gttcgtggtg 20 96 20 DNA H. sapiens 96 tctctcctgg
agctgcacaa 20 97 20 DNA H. sapiens 97 tggctgccag tacctgcacc 20 98
20 DNA H. sapiens 98 ccgaaaccga gttattcatc 20 99 20 DNA H. sapiens
99 ttcatcgaga cctcaagctg 20 100 20 DNA H. sapiens 100 gggcaacctt
ttcctgaatg 20 101 20 DNA H. sapiens 101 gatctggagg tgaaaatagg 20
102 20 DNA H. sapiens 102 tgtgtgggac tcctaattac 20 103 20 DNA H.
sapiens 103 tgctgagcaa gaaagggcac 20 104 20 DNA H. sapiens 104
cacagtttcg aggtggatgt 20 105 20 DNA H. sapiens 105 tgttagtggg
caaaccacct 20 106 20 DNA H. sapiens 106 gtgggcaaac caccttttga 20
107 20 DNA H. sapiens 107 cttcttgcct aaaagagacc 20 108 20 DNA H.
sapiens 108 tgcctaaaag agacctacct 20 109 20 DNA H. sapiens 109
aatgaataca gtattcccaa 20 110 20 DNA H. sapiens 110 atacagtatt
cccaagcaca 20 111 20 DNA H. sapiens 111 catccagaag atgcttcaga 20
112 20 DNA H. sapiens 112 gacgagttct ttacttctgg 20 113 20 DNA H.
sapiens 113 attgctccca gcagcctgga 20 114 20 DNA H. sapiens 114
cccgggaaaa agaagaacca 20 115 20 DNA H. sapiens 115 ccagtggttc
gagagacagg 20 116 20 DNA H. sapiens 116 ggagcgtggg ctggtcaggc 20
117 20 DNA H. sapiens 117 gacagcctgc agtacataga 20 118 20 DNA H.
sapiens 118 cctgcagtac atagagcgtg 20 119 20 DNA H. sapiens 119
cctacctcac cgtgagttcc 20 120 20 DNA H. sapiens 120 tatttccgca
attacatgag 20 121 20 DNA H. sapiens 121 ccgcagcgcc atcatcctgc 20
122 20 DNA H. sapiens 122 gcagcgccat catcctgcac 20 123 20 DNA H.
sapiens 123 cttgtgccca ctgatggcag 20 124 20 DNA H. sapiens 124
gcactatggt ggacaagctg 20 125 20 DNA H. sapiens 125 aggcctccta
atagctgccc 20 126 20 DNA H. sapiens 126 gcggtgccat gtctgcagtg 20
127 20 DNA H. sapiens 127 cacattaaac agatgtgaat 20 128 20 DNA H.
sapiens 128 gcttcttggc tctgggagct 20 129 20 DNA H. sapiens 129
agtggagtct gagtcatgtt 20
* * * * *