U.S. patent application number 16/267231 was filed with the patent office on 2019-06-06 for delivery of active agents.
The applicant listed for this patent is MannKind Corporation. Invention is credited to Robert A. Baughman, Donald Costello, Andrea Leone-Bay, Peter Richardson.
Application Number | 20190167580 16/267231 |
Document ID | / |
Family ID | 40545981 |
Filed Date | 2019-06-06 |
![](/patent/app/20190167580/US20190167580A1-20190606-C00001.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00001.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00002.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00003.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00004.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00005.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00006.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00007.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00008.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00009.png)
![](/patent/app/20190167580/US20190167580A1-20190606-D00010.png)
View All Diagrams
United States Patent
Application |
20190167580 |
Kind Code |
A1 |
Richardson; Peter ; et
al. |
June 6, 2019 |
Delivery of Active Agents
Abstract
A method of introducing a physiologically-active agent into the
circulatory system of a mammal is disclosed herein. The method
utilizes a rapid drug delivery system which prevents deactivation
or degradation of the active agent being administered to a patient
in need of treatment. In particular, the drug delivery system is
designed for pulmonary drug delivery such as by inhalation, for
delivery of the active agents such as proteins and peptides to the
pulmonary circulation in a therapeutically effective manner
avoiding degradation of the active agents in peripheral and
vascular tissue before reaching the target site.
Inventors: |
Richardson; Peter; (Ringoes,
NJ) ; Baughman; Robert A.; (Brookfield, CT) ;
Leone-Bay; Andrea; (Ridgefield, CT) ; Costello;
Donald; (Bridgewater, NJ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MannKind Corporation |
Westlake Village |
CA |
US |
|
|
Family ID: |
40545981 |
Appl. No.: |
16/267231 |
Filed: |
February 4, 2019 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
13737823 |
Jan 9, 2013 |
|
|
|
16267231 |
|
|
|
|
12258341 |
Oct 24, 2008 |
8372804 |
|
|
13737823 |
|
|
|
|
60982368 |
Oct 24, 2007 |
|
|
|
60985620 |
Nov 5, 2007 |
|
|
|
61033740 |
Mar 4, 2008 |
|
|
|
61052127 |
May 9, 2008 |
|
|
|
61022274 |
Jan 18, 2008 |
|
|
|
61094823 |
Sep 5, 2008 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61K 9/1688 20130101;
A61K 9/1617 20130101; A61K 9/0075 20130101; A61P 5/00 20180101;
A61P 5/02 20180101; A61K 38/26 20130101; A61K 31/495 20130101; A61P
3/04 20180101; A61P 3/00 20180101; A61P 3/10 20180101 |
International
Class: |
A61K 9/00 20060101
A61K009/00; A61K 38/26 20060101 A61K038/26; A61K 9/16 20060101
A61K009/16; A61K 31/495 20060101 A61K031/495 |
Claims
1. A method of administering a labile active agent to a patient
comprising: administering to said patient in need thereof an
effective amount of a pharmaceutical composition comprising a
diketopiperazine and one or more active agents by pulmonary
inhalation; wherein the one or more active agents is sensitive to
enzymatic deactivation or degradation when in contact with local
peripheral and vascular tissue, and said pharmaceutical composition
provides avoidance of enzymatic deactivation or degradation of the
one or more active agents.
2. The method of claim 1, wherein said diketopiperazine is
2,5-diketo-3,6-di(4-X-aminobutyl)piperazine; wherein X is selected
from the group consisting of succinyl, glutaryl, maleyl, and
fumaryl; or a pharmaceutically acceptable salt thereof.
3. The method of claim 1, wherein the pharmaceutical composition is
a dry powder formulation.
4. The method of claim 3, wherein said dry powder formulation
further comprises a pharmaceutically acceptable carrier or
excipient.
5. The method of claim 3, wherein the dry powder formulation is
administered using a dry powder inhalation system.
6. The method of claim 1, wherein the at least one of the one or
more active agents is a vasoactive agent.
7. The method of claim 6, wherein the vasoactive agent is a
prostaglandin.
8. The method of claim 7, wherein the prostaglandin is PG 12.
9. The method of claim 6, wherein the at least one vasoactive agent
is administered at dosages ranging from about 0.01 mg to about 3
mg.
10. The method of claim 1, wherein said patient is in need of
treatment with a vasodilator.
11. The method of claim 1, wherein the step of administering said
pharmaceutical composition to said patient comprises administering
said pharmaceutical composition using a breath-powered dry powder
inhaler comprising a cartridge.
12. A method of improving the effectiveness of a labile active
agent in a patient comprising: administering by inhalation a
pharmaceutical composition comprising a diketopiperazine
microparticle and one or more active agents, wherein about 35% to
about 75% of the microparticles have an aerodynamic diameter of
less than 5.8 .mu.m; wherein the labile active agent when
administered by injection is subject to degradation in the patient
as a result of exposure to peripheral tissue, vascular venous
tissue, or liver metabolism, and said labile active agent
effectiveness is reduced by said degradation prior to reaching a
site of action.
13. The method of claim 12, wherein said diketopiperazine is
2,5-diketo-3,6-di(4-X-aminobutyl)piperazine; wherein X is selected
from the group consisting of succinyl, glutaryl, maleyl, and
fumaryl; or a pharmaceutically acceptable salt thereof.
14. The method of claim 12, wherein the pharmaceutical composition
is a dry powder formulation.
15. The method of claim 12, wherein said labile active agent is a
prostaglandin.
16. The method of claim 15, wherein the prostaglandin is PG 12.
17. A method of administering a prostaglandin to a patient in need
thereof comprising: administering to said patient an inhalable dry
powder pharmaceutical composition comprising diketopiperazine
microparticles and said prostaglandin, wherein about 35% to about
75% of the diketopiperazine microparticles have an aerodynamic
diameter of less than 5.8 .mu.m, wherein the prostaglandin is
subject to degradation in a patient as a result of exposure to
peripheral tissue, vascular venous tissue, or liver metabolism when
administered by other routes of administration.
18. The method of claim 17, wherein the inhalable dry powder
further comprises an additional vasoactive agent.
19. The method of claim 17, wherein the diketopiperazine
microparticles comprise 2,5-diketo-3,6-di(4-X-aminobutyl)piperazine
and X is fumaryl.
20. A method of treating pulmonary disease to a patient in need
thereof comprising: administering to said patient an inhalable dry
powder formulation comprising a therapeutically effective amount of
a prostaglandin using a breath-powered dry powder inhaler, wherein
said formulation comprises from about 0.01 mg to about 3 mg of said
prostaglandin.
21. The method of claim 20, wherein said prostaglandin is PG I2.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 13/737,823, filed Jan. 9, 2013, which is a
continuation of U.S. patent application Ser. No. 12/258,341, filed
on Oct. 24, 2008, which claims priority under 35 U.S.C. .sctn.
119(e) to U.S. Provisional Application Ser. No. 60/982,368 filed
Oct. 24, 2007; 60/985,620 filed Nov. 5, 2007; 61/033,740 filed Mar.
4, 2008; 61/052,127 filed May 9, 2008; 61/022,274 filed Jan. 18,
2008; and 61/094,823 filed Sep. 5, 2008. The entire contents of
each of these applications are incorporated by reference
herein.
TECHNICAL FIELD
[0002] A method of introducing a physiologically-active ingredient
into the circulatory system of a mammal is disclosed herein. The
method comprises a rapid drug delivery system which prevents or
attenuates deactivation or degradation of the active agent being
administered to a patient in need of treatment. In particular, the
drug delivery system is designed for pulmonary drug delivery such
as by inhalation, for delivery of the active agent to the pulmonary
circulation in a therapeutically effective manner. The drug
delivery system has advantages over other methods of drug delivery,
for example, oral, subcutaneous and intravenous administration of
active agents such as proteins and peptides that are sensitive to
enzymatic deactivation or degradation in the local peripheral and
vascular tissue before reaching the target site.
BACKGROUND
[0003] Drug delivery systems for the treatment of disease which
introduce active ingredients into the circulation are numerous and
include oral, transdermal, subcutaneous and intravenous
administration. While these systems have been used for quite a long
time and can deliver sufficient medication for the treatment of
many diseases, there are numerous challenges associated with these
drug delivery mechanisms. In particular, delivery of effective
amounts of proteins and peptides to treat a target disease has been
problematic. Many factors are involved in introducing the right
amount of the active agent, for example, preparation of the proper
drug delivery formulation so that the formulation contains an
amount of active agent that can reach its site(s) of action in an
effective amount.
[0004] The active agent must be stable in the drug delivery
formulation and the formulation should allow for absorption of the
active agent into the circulation and remain active so that it can
reach the site(s) of action at effective therapeutic levels. Thus,
in the pharmacological arts, drug delivery systems which can
deliver a stable active agent are of utmost importance.
[0005] Making drug delivery formulations therapeutically suitable
for treating disease, depends on the characteristics of the active
ingredient or agent to be delivered to the patient. Such
characteristics can include in a non-limiting manner solubility,
pH, stability, toxicity, release rate, and ease of removal from the
body by normal physiologic processes. For example, in oral
administration, if the agent is sensitive to acid, enteric coatings
have been developed using pharmaceutically acceptable materials
which can prevent the active agent from being released in the low
pH (acid) of the stomach. Thus, polymers that are not soluble at
acidic pH are used to formulate and deliver a dose containing
acid-sensitive agents to the small intestine where the pH is
neutral. At neutral pH, the polymeric coating can dissolve to
release the active agent which is then absorbed into the enteric
systemic circulation. Orally administered active agents enter the
systemic circulation and pass through the liver. In certain cases,
some portion of the dose is metabolized and/or deactivated in the
liver before reaching the target tissues. In some instances, the
metabolites can be toxic to the patient, or can yield unwanted side
effects.
[0006] Similarly, subcutaneous and intravenous administration of
pharmaceutically-active agents is not devoid of degradation and
inactivation. With intravenous administration of drugs, the drugs
or active ingredients can also be metabolized, for example in the
liver, before reaching the target tissue. With subcutaneous
administration of certain active agents, including various proteins
and peptides, there is additionally degradation and deactivation by
peripheral and vascular tissue enzymes at the site of drug delivery
and during travel through the venous blood stream. In order to
deliver a dose that will yield an acceptable quantity for treating
disease with subcutaneous and intravenous administration of an
active agent, dosing regimes will always have to account for the
inactivation of the active agent by peripheral and vascular venous
tissue and ultimately the liver.
SUMMARY
[0007] A method of introducing an active agent into the circulatory
system of a mammal is disclosed herein. The method comprises a drug
delivery system which prevents deactivation or degradation of the
active agent being administered to a patient in need of treatment.
In particular, the drug delivery system is designed for pulmonary
drug delivery such as by inhalation, for delivery of active agents
to the pulmonary circulation in a therapeutically effective manner.
The drug delivery system has advantages over other methods of drug
delivery, for example, oral, subcutaneous and intravenous
administration of drug products such as proteins and peptides that
are sensitive to enzymatic deactivation or degradation in the local
peripheral and vascular tissue before reaching the target site.
[0008] In one embodiment disclosed herein, a method for providing
an active agent to a patient in need thereof is disclosed
comprising selecting an active agent subject to degradation in the
patient wherein effectiveness of the active agent is reduced by the
degradation; associating the active agent with a diketopiperazine
to produce a pharmaceutical composition suitable for pulmonary
inhalation; and providing the pharmaceutical composition to the
patient.
[0009] In another embodiment, the degradation occurs in venous
blood circulation, in a peripheral tissue, in the gastrointestinal
system or in the liver.
[0010] Also disclosed herein is a method of treating disease
comprising selecting a patient being treated with or a patient with
a condition treatable by a labile active agent; providing a
composition comprising the labile active agent in association with
a diketopiperazine; and administering the composition to the
patient via pulmonary inhalation; thereby treating the disease or
condition.
[0011] In another embodiment, the diketopiperazine is
2,5-diketo-3,6-di(4-X-aminobutyl)piperazine; wherein X is selected
from the group consisting of succinyl, glutaryl, maleyl, and
fumaryl; or a pharmaceutically acceptable salt thereof. In another
embodiment, the pharmaceutical composition is an inhalable dry
powder formulation. In yet another embodiment, the inhalable dry
powder formulation further comprises a pharmaceutically acceptable
carrier or excipient.
[0012] In one embodiment, the inhalable dry powder formulation is
provided to the patient by pulmonary inhalation using a dry powder
inhalation system.
[0013] In yet another embodiment, the active agent is a protein, a
peptide, or an analog thereof. In another embodiment, the active
agent is an endocrine hormone or an analog thereof. The endocrine
hormone is a hormone associated with diabetes, hyperglycemia and/or
obesity. In another embodiment, the diabetes is type 2 diabetes
mellitus.
[0014] In another embodiment of the disclosed method, the step of
administering the composition to the patient comprises pulmonary
administration of the composition using a dry powder inhaler
comprising a cartridge, such as a unit dosing cartridge.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 depicts the mean plasma concentration of active
glucagon-like peptide 1 (GLP-1) in subjects treated with an
inhalable dry powder formulation containing a GLP-1 dose of 1.5 mg
measured at various times after inhalation.
[0016] FIG. 2A depicts the mean plasma concentration of insulin in
subjects treated with an inhalable dry powder formulation
containing a GLP-1 dose of 1.5 mg measured at various times after
inhalation.
[0017] FIG. 2B depicts the plasma concentration of GLP-1 in
subjects treated with an inhalable dry powder formulation
containing a GLP-1 dose of 1.5 mg measured at various times after
inhalation compared to subjects treated with a subcutaneous
administration of GLP-1.
[0018] FIG. 2C depicts the plasma insulin concentration in subjects
treated with an inhalable dry powder formulation containing a GLP-1
dose of 1.5 mg measured at various times after inhalation compared
to subjects treated with an intravenuous GLP-1 dose of 50 .mu.g and
subjects treated with a subcutaneous GLP-1 dose.
[0019] FIG. 3 depicts the mean plasma concentration of the
C-peptide in subjects treated with an inhalable dry powder
formulation containing a GLP-1 dose of 1.5 mg measured at various
times after inhalation.
[0020] FIG. 4 depicts the mean plasma concentration of glucose in
subjects treated with an inhalable dry powder formulation
containing GLP-1 doses of 0.05 mg, 0.45 mg, 0.75 mg, 1.05 mg and
1.5 mg, measured at various times after inhalation.
[0021] FIG. 5 depicts mean plasma insulin concentrations in
patients treated with an inhalable dry powder formulation
containing GLP-1 doses of 0.05 mg, 0.45 mg, 0.75 mg, 1.05 mg and
1.5 mg. The data shows that insulin secretion in response to
pulmonary GLP-1 administration is dose dependent.
[0022] FIG. 6 depicts mean plasma glucagon concentrations in
patients treated with an inhalable dry powder formulation
containing GLP-1 doses of 0.05 mg, 0.45 mg, 0.75 mg, 1.05 mg and
1.5 mg.
[0023] FIG. 7 depicts the mean plasma exendin concentrations in
male Zucker Diabetic Fatty (ZDF) rats receiving exendin-4/FDKP
(fumaryl diketopiperazine) powder by pulmonary insufflation versus
subcutaneous (SC) administered exendin-4. The closed squares
represent the response following pulmonary insufflation of
exendin-4/FDKP powder. The open squares represent the response
following administration of SC exendin-4. Data are plotted as
means.+-.SD.
[0024] FIG. 8 depicts changes in blood glucose concentration from
baseline in male ZDF rats receiving either air control,
exendin-4/FDKP powder, or GLP-1/FDKP powder by pulmonary
insufflation versus subcutaneously administered exendin-4. The
graph also shows a combination experiment in which the rats were
administered by pulmonary insufflation an inhalation powder
comprising GLP-1/FDKP, followed by an inhalation powder comprising
exendin-4/FDKP. In the graph, the closed diamonds represent the
response following pulmonary insufflation of exendin-4/FDKP powder.
The closed circles represent the response following administration
of subcutaneous exendin-4. The triangles represent the response
following administration of GLP-1/FDKP powder. The squares
represent the response following pulmonary insufflation of air
alone. The stars represent the response given by 2 mg of GLP-1/FDKP
given to the rats by insufflation followed by a 2 mg exendin-4/FDKP
powder administered also by insufflation.
[0025] FIG. 9A depicts the mean plasma oxyntomodulin concentrations
in male ZDF rats receiving oxyntomodulin/FDKP powder by pulmonary
insufflation versus intravenous (IV) oxyntomodulin. The squares
represent the response following IV administration of oxyntomodulin
alone. The up triangles represent the response following pulmonary
insufflation of 5% oxyntomodulin/FDKP powder (0.15 mg
oxyntomodulin). The circles represent the response following
pulmonary insufflation of 15% oxyntomodulin/FDKP powder (0.45 mg
oxyntomodulin). The down triangles represent the response following
pulmonary insufflation of 30% oxyntomodulin/FDKP powder (0.9 mg
oxyntomodulin). Data are plotted as means.+-.SD.
[0026] FIG. 9B depicts the cumulative food consumption in male ZDF
rats receiving 30% oxyntomodulin/FDKP powder (0.9 mg oxyntomodulin)
by pulmonary insufflation (1); oxyntomodulin alone (1 mg
oxyntomodulin) by IV injection (2); or air control (3).
[0027] FIG. 10A depicts the mean plasma oxyntomodulin
concentrations in male ZDF rats receiving oxyntomodulin/FDKP powder
by pulmonary insufflation versus air control. The squares represent
the response following administration of air control. The circles
represent the response following pulmonary insufflation of
oxyntomodulin/FDKP powder (0.15 mg oxyntomodulin). The up triangles
represent the response following pulmonary insufflation of
oxyntomodulin/FDKP powder (0.45 mg oxyntomodulin). The down
triangles represent the response following pulmonary insufflation
of oxyntomodulin/FDKP powder (0.9 mg oxyntomodulin). Data are
plotted as means.+-.SD.
[0028] FIG. 10B depicts data from experiments showing cumulative
food consumption in male ZDF rats receiving 30% oxyntomodulin/FDKP
powder at varying doses including 0.15 mg oxyntomodulin (1); 0.45
mg oxyntomodulin (2); or 0.9 mg oxyntomodulin (3) by pulmonary
insufflation compared to air control (4). Data are plotted as
means.+-.SD. An asterisk (*) denotes statistical significance.
[0029] FIG. 11 depicts the glucose values obtained from six fasted
Type 2 diabetic patients following administration of a single dose
of an inhalable dry powder formulation containing GLP-1 at various
time points.
[0030] FIG. 12 depicts the mean glucose values for the group of six
fasted Type 2 diabetic patients of FIG. 11, in which the glucose
values are expressed as the change of glucose levels from zero time
(dosing) for all six patients.
[0031] FIG. 13 depicts data obtained from experiments in which ZDF
rats were administered exendin-4 in a formulation comprising a
diketopiperazine or a salt of a diketopiperazine, wherein the
exendin-4 was provided by various routes of administration (liquid
installation (LIS), SC, pulmonary insufflation (INS)) in an
intraperitoneal glucose tolerance test (IPGTT). In one group, rats
were treated with exendin-4 in combination with GLP-1 by pulmonary
insufflation.
[0032] FIG. 14 depicts cumulative food consumption in male ZDF rats
receiving air control by pulmonary insufflation, peptide YY(3-36)
(PYY) alone by IV injection, PYY alone by pulmonary instillation,
10% PYY/FDKP powder (0.3 mg PYY) by pulmonary insufflation; 20%
PYY/FDKP powder (0.6 mg PYY) by pulmonary insufflation. For each
group food consumption was measured 30 minutes after dosing, 1 hour
after dosing, 2 hours after dosing, and 4 hours after dosing. Data
are plotted mean.+-.SD.
[0033] FIG. 15 depicts the blood glucose concentration in female
ZDF rats administered PYY/FDKP powder by pulmonary insufflation
versus intravenously administered PYY at various times following
dose administration.
[0034] FIG. 16 depicts mean plasma concentrations of PYY in female
ZDF rats receiving PYY/FDKP powder by pulmonary insufflation versus
intravenously administered PYY. The squares represent the response
following intravenous administration of PYY alone (0.6 mg). The
circles represent the response following liquid instillation of PYY
alone (1 mg). The down triangles represent the response following
pulmonary insufflation of 20% PYY/FDKP powder (0.6 mg PYY). The up
triangles represent the response following pulmonary insufflation
of 10% PYY/FDKP powder (0.3 mg PYY). The left-pointing triangles
represent the response following pulmonary insufflation of air
alone. Data are plotted as .+-.SD.
[0035] FIG. 17 depicts the relative drug exposure and relative
bioeffect of the present formulations administered by pulmonary
inhalation and containing insulin, exendin, oxyntomodulin or PYY
compared to subcutaneous and intravenous administration.
[0036] FIG. 18 depicts mean GLP-1 plasma levels in patients
administered various inhaled GLP-1 and control formulations.
[0037] FIG. 19 depicts plasma insulin levels in patients
administered various inhaled GLP-1 and control formulations.
[0038] FIG. 20 depicts gastric emptying in response to an inhaled
GLP-1 formulation in patients administered various inhaled GLP-1
and control formulations.
DEFINITION OF TERMS
[0039] Prior to setting forth the invention, it may be helpful to
provide an understanding of certain terms that will be used
hereinafter:
[0040] Active Agents: As used herein "active agent" refers to
drugs, pharmaceutical substances and bioactive agents. Active
agents can be organic macromolecules including nucleic acids,
synthetic organic compounds, polypeptides, peptides, proteins,
polysaccharides and other sugars, and lipids. Peptides, proteins,
and polypeptides are all chains of amino acids linked by peptide
bonds. Peptides are generally considered to be less than 40 amino
acid residues, but may include more. Proteins are polymers that
typically contain more than 40 amino acid residues. The term
polypeptide as is know in the art and as used herein, can refer to
a peptide, a protein, or any other chain of amino acids of any
length containing multiple peptide bonds, though generally
containing at least 10 amino acids. The active agents can fall
under a variety of biological activity classes, such as vasoactive
agents, neuroactive agents, hormones, anticoagulants,
immunomodulating agents, cytotoxic agents, antibiotics, antiviral
agents, antigens, and antibodies. More particularly, active agents
may include, in a non-limiting manner, insulin and analogs thereof,
growth hormone, parathyroid hormone (PTH), ghrelin, granulocyte
macrophage colony stimulating factor (GM-CSF), glucagon-like
peptide 1 (GLP-1), and analogs of such peptides, Texas Red,
alkynes, cyclosporins, clopidogrel and PPACK
(D-phenylalanyl-L-prolyl-L-arginine chloromethyl ketone),
antibodies and fragments thereof, including, but not limited to,
humanized or chimeric antibodies; F(ab), F(ab).sub.2, or
single-chain antibody alone or fused to other polypeptides;
therapeutic or diagnostic monoclonal antibodies to cancer antigens,
cytokines, infectious agents, inflammatory mediators, hormones, and
cell surface antigens. In some instances, the terms "drug" and
"active agent" are used interchangeably.
[0041] Diketopiperazine: As used herein, "diketopiperazine" or
"DKP" includes diketopiperazines and salts, derivatives, analogs
and modifications thereof falling within the scope of the general
Formula 1, wherein the ring atoms E.sub.1 and E.sub.2 at positions
1 and 4 are either 0 or N and at least one of the side-chains
R.sub.1 and R.sub.2 located at positions 3 and 6 respectively
contains a carboxylic acid (carboxylate) group. Compounds according
to Formula 1 include, without limitation, diketopiperazines,
diketomorpholines and diketodioxanes and their substitution
analogs.
##STR00001##
[0042] Diketopiperazines, in addition to making aerodynamically
suitable microparticles, can also facilitate the delivery of active
agents by rapidly dissolving at physiologic pH thereby releasing
the active agent and speeding its absorption into the circulation.
Diketopiperazines can be formed into particles that incorporate a
drug or particles onto which a drug can be adsorbed. The
combination of a drug and a diketopiperazine can impart improved
drug stability. These particles can be administered by various
routes of administration. As dry powders these particles can be
delivered by inhalation to specific areas of the respiratory
system, depending on particle size. Additionally, the particles can
be made small enough for incorporation into an intravenous
suspension dosage form. Oral delivery is also possible with the
particles incorporated into a suspension, tablets or capsules.
[0043] In one embodiment, the diketopiperazine is
3,6-di(fumaryl-4-aminobutyl)-2,5-diketopiperazine (fumaryl
diketopiperazine, FDKP). The FDKP can comprise microparticles in
its acid form or salt forms which can be aerosolized or
administered in a suspension.
[0044] In another embodiment, the DKP is a derivative of
3,6-di(4-aminobutyl)-2,5-diketopiperazine, which can be formed by
(thermal) condensation of the amino acid lysine. Exemplary
derivatives include 3,6-di(succinyl-4-aminobutyl)-,
3,6-di(maleyl-4-aminobutyl)-, 3,6-di(glutaryl-4-aminobutyl)-,
3,6-di(malonyl-4-aminobutyl)-, 3,6-di(oxalyl-4-aminobutyl)-, and
3,6-di(fumaryl-4-aminobutyl)-2,5-diketopiperazine. The use of DKPs
for drug delivery is known in the art (see for example U.S. Pat.
Nos. 5,352,461, 5,503,852, 6,071,497, and 6,331,318'', each of
which is incorporated herein by reference for all that it teaches
regarding diketopiperazines and diketopiperazine-mediated drug
delivery). The use of DKP salts is described in co-pending U.S.
patent application Ser. No. 11/210,710 filed Aug. 23, 2005, which
is hereby incorporated by reference for all it teaches regarding
diketopiperazine salts. Pulmonary drug delivery using DKP
microparticles is disclosed in U.S. Pat. No. 6,428,771, which is
hereby incorporated by reference in its entirety. Further details
related to adsorption of active agents onto crystalline DKP
particles can be found in co-pending U.S. patent application Ser.
Nos. 11/532,063 and 11/532,065 which are hereby incorporated by
reference in their entirety.
[0045] Drug delivery system: As used herein, "drug delivery system"
refers to a system for delivering one or more active agents.
[0046] Dry powder: As used herein, "dry powder" refers to a fine
particulate composition that is not suspended or dissolved in a
propellant, carrier, or other liquid. It is not meant to
necessarily imply a complete absence of all water molecules.
[0047] Early phase: As used herein, "early phase" refers to the
rapid rise in blood insulin concentration induced in response to a
meal. This early rise in insulin in response to a meal is sometimes
referred to as first-phase. In more recent sources first-phase is
sometimes used to refer to the more rapid rise in blood insulin
concentration of the kinetic profile achievable with a bolus IV
injection of glucose in distinction to the meal-related
response.
[0048] Endocrine disease: The endocrine system is an information
signal system that releases hormones from the glands to provide
specific chemical messengers which regulate many and varied
functions of an organism, e.g., mood, growth and development,
tissue function, and metabolism, as well as sending messages and
acting on them. Diseases of the endocrine system include, but are
not limited to diabetes mellitus, thyroid disease, and obesity.
Endocrine disease is characterized by dysregulated hormone release
(a productive pituitary adenoma), inappropriate response to
signalling (hypothyroidism), lack or destruction of a gland
(diabetes mellitus type 1, diminished erythropoiesis in chronic
renal failure), reduced responsiveness to signaling (insulin
resistance of diabetes mellitus type 2), or structural enlargement
in a critical site such as the neck (toxic multinodular goiter).
Hypofunction of endocrine glands can occur as result of loss of
reserve, hyposecretion, agenesis, atrophy, or active destruction.
Hyperfunction can occur as result of hypersecretion, loss of
suppression, hyperplastic, or neoplastic change, or
hyperstimulation. The term endocrine disorder encompasses metabolic
disorders.
[0049] Excursion: As used herein, "excursion" can refer to blood
glucose concentrations that fall either above or below a pre-meal
baseline or other starting point. Excursions are generally
expressed as the area under the curve (AUC) of a plot of blood
glucose over time. AUC can be expressed in a variety of ways. In
some instances there will be both a fall below and rise above
baseline creating a positive and negative area. Some calculations
will subtract the negative AUC from the positive, while others will
add their absolute values. The positive and negative AUCs can also
be considered separately. More sophisticated statistical
evaluations can also be used. In some instances it can also refer
to blood glucose concentrations that rise or fall outside a normal
range. A normal blood glucose concentration is usually between 70
and 110 mg/dL from a fasting individual, less than 120 mg/dL two
hours after eating a meal, and less than 180 mg/dL after eating.
While excursion has been described here in terms of blood glucose,
in other contexts the term may be similarly applied to other
analytes.
[0050] Glucose elimination rate: As used herein, "glucose
elimination rate" is the rate at which glucose disappears from the
blood. It is commonly determined by the amount of glucose infusion
required to maintain stable blood glucose, often around 120 mg/dL
during the study period. This glucose elimination rate is equal to
the glucose infusion rate, abbreviated as GIR.
[0051] Hyperglycemia: As used herein, "hyperglycemia" is a higher
than normal fasting blood glucose concentration, usually 126 mg/dL
or higher. In some studies hyperglycemic episodes were defined as
blood glucose concentrations exceeding 280 mg/dL (15.6 mM).
[0052] Hypoglycemia: As used herein, "hypoglycemia" is a lower than
normal blood glucose concentration, usually less than 63 mg/dL 3.5
mM), Clinically relevant hypoglycemia is defined as blood glucose
concentration below 63 mg/dL or causing patient symptoms such as
hypotonia, flush and weakness that are recognized symptoms of
hypoglycemia and that disappear with appropriate caloric intake.
Severe hypoglycemia is defined as a hypoglycemic episode that
required glucagon injections, glucose infusions, or help by another
party.
[0053] In proximity: As used herein, "in proximity," as used in
relation to a meal, refers to a period near in time to the
beginning of a meal or snack.
[0054] Microparticles: As used herein, the term "microparticles"
includes particles of generally 0.5 to 100 microns in diameter and
particularly those less than 10 microns in diameter. Various
embodiments will entail more specific size ranges. The
microparticles can be assemblages of crystalline plates with
irregular surfaces and internal voids as is typical of those made
by pH controlled precipitation of the DKP acids. In such
embodiments the active agents can be entrapped by the precipitation
process or coated onto the crystalline surfaces of the
microparticle. The microparticles can also be spherical shells or
collapsed spherical shells comprised of DKP salts with the active
agent dispersed throughout. Typically such particles can be
obtained by spray drying a co-solution of the DKP and the active
agent. The DKP salt in such particles can be amorphous. The
forgoing descriptions should be understood as exemplary. Other
forms of microparticles are contemplated and encompassed by the
term.
[0055] Obesity: is a condition in which excess body fat has
accumulated to such an extent that health may be negatively
affected. Obesity is typically assessed by BMI (body mass index)
with BMI of greater than 30 kg/m.sup.2.
[0056] Peripheral tissue: As used herein, "peripheral tissue"
refers to any connective or interstitial tissue that is associated
with an organ or vessel.
[0057] Periprandial: As used herein, "periprandial" refers to a
period of time starting shortly before and ending shortly after the
ingestion of a meal or snack.
[0058] Postprandial: As used herein, "postprandial" refers to a
period of time after ingestion of a meal or snack. As used herein,
late postprandial refers to a period of time 3, 4, or more hours
after ingestion of a meal or snack.
[0059] Potentiation: Generally, potentiation refers to a condition
or action that increases the effectiveness or activity of some
agent over the level that the agent would otherwise attain.
Similarly it may refer directly to the increased effect or
activity. As used herein, "potentiation" particularly refers to the
ability of elevated blood insulin concentrations to boost
effectiveness of subsequent insulin levels to, for example, raise
the glucose elimination rate.
[0060] Prandial: As used herein, "prandial" refers to a meal or a
snack.
[0061] Preprandial: As used herein, "preprandial" refers to a
period of time before ingestion of a meal or snack.
[0062] Pulmonary inhalation: As used herein, "pulmonary inhalation"
is used to refer to administration of pharmaceutical preparations
by inhalation so that they reach the lungs and in particular
embodiments the alveolar regions of the lung. Typically inhalation
is through the mouth, but in alternative embodiments in can entail
inhalation through the nose.
DETAILED DESCRIPTION
[0063] There is disclosed a method for the treatment of a disease
or disorder which utilizes a drug delivery system that effectively
delivers an active agent to the pulmonary circulation so that the
active agent enters the pulmonary circulation and can be delivered
in a therapeutic amount to the site(s) of action. The methods of
treatment of disease or disorders comprise administering to a
patient in need of treatment a formulation which can deliver the
active agent directly into the pulmonary circulation, and thereby
to the arterial circulation, and can avoid degradation of the
active agent such as peptides, by enzymes or other mechanisms in
the local peripheral and/or vasculature tissues of the lungs. In
one embodiment, the method comprises the effective therapeutic
delivery of active agents using a drug delivery system which allows
for very rapid lung absorption of the active agent into the
circulation and increases its effective bioavailability. In this
embodiment, lower dosages of an active agent can be delivered by
this method of administration. In similar embodiments effective
doses can be achieved where they were not feasible by other modes
of administration.
[0064] In embodiments herein, there is disclosed a method for the
treatment of disease, including, endocrine disease, such as
diabetes, hyperglycemia and obesity. The inventors have identified
the need to deliver drugs directly to the systemic circulation, in
particular, the arterial circulation in a noninvasive fashion so
that the drug reaches the target organ(s) prior to returning
through the venous system. This approach may paradoxically result
in a higher peak target organ exposure to active agents than would
result from a comparable administration via an intravenous,
subcutaneous or other parenteral route. A similar advantage can be
obtained versus oral administration as, even with formulations
providing protection from degradation in the digestive tract, upon
absorption the active agent will enter the venous circulation.
[0065] In one embodiment, the drug delivery system can be used with
any type of active agent that is rapidly metabolized and/or
degraded by direct contact with the local degradative enzymes or
other degradative mechanisms, for example, oxidation,
phosphorylation or any modification of the proteins or peptides, in
the peripheral or vascular venous tissue encountered with other
routes of administration such as oral, intravenous, transdermal,
and subcutaneous administration. In this embodiment, the method can
comprise the step of identifying and selecting an active agent
which activity is metabolized or degraded by oral, subcutaneous or
intravenous administration. For example, due to lability,
subcutaneous injection of GLP-1 has not led to effective levels of
GLP-1 in the blood. This contrasts with peptides such as insulin
which can be delivered effectively by such modes of
administration.
[0066] In certain embodiments, the method of treatment of a disease
or disorder comprises the step of selecting a suitable carrier for
inhalation and delivering an active substance to pulmonary alveoli.
In this embodiment, the carrier can be associated with one or more
active agents to form a drug/carrier complex which can be
administered as a composition that avoids rapid degradation of the
active agent in the peripheral and vascular venous tissue of the
lung. In one embodiment, the carrier is a diketopiperazine.
[0067] The method described herein can be utilized to deliver many
types of active agents, including biologicals. In particular
embodiments, the method utilizes a drug delivery system that
effectively delivers a therapeutic amount of an active agent,
including peptide hormones, rapidly into the arterial circulation.
In one embodiment, the one or more active agents include, but are
not limited to peptides such as glucagon-like peptide 1 (GLP-1),
proteins, lipokines, small molecule pharmaceuticals, nucleic acids
and the like, which is/are sensitive to degradation or
deactivation; formulating the active agent into a dry powder
composition comprising a diketopiperazine and delivering the active
agent(s) into the systemic circulation by pulmonary inhalation
using a cartridge and a dry powder inhaler. In one embodiment, the
method comprises selecting a peptide that is sensitive to enzymes
in the local vascular or peripheral tissue of, for example, the
dermis, or lungs. The present method allows the active agent to
avoid or reduce contact with peripheral tissue, venous or liver
metabolism/degradation. In another embodiment, for systemic
delivery the active agent should not have specific receptors in the
lungs.
[0068] In alternate embodiments, the drug delivery system can also
be used to deliver therapeutic peptides or proteins of naturally
occurring, recombinant, or synthetic origin for treating disorders
or diseases, including, but not limited to adiponectin,
cholecystokinin (CCK), secretin, gastrin, glucagon, motilin,
somatostatin, brain natriuretic peptide (BNP), atrial natriuretic
peptide (ANP), parathyroid hormone, parathyroid hormone related
peptide (PTHrP), IGF-1, growth hormone releasing factor (GHRF),
granulocyte-macrophage colony stimulating factor (GM-CSF),
anti-IL-8 antibodies, IL-8 antagonists including ABX-IL-8; integrin
beta-4 precursor (ITB4) receptor antagonist, enkephalins,
nociceptin, nocistatin, orphanin FQ2, calcitonin, CGRP,
angiotensin, substance P, neurokinin A, pancreatic polypeptide,
neuropeptide Y, delta-sleep-inducing peptide, prostaglandings
including PG-12, LTB receptor blockers including, LY29311, BIIL
284, CP105696; vasoactive intestinal peptide; triptans such as
sumatriptan and lipokines such as C16:1n7 or palmitoleate or
analogs thereof. In yet another embodiment, the active agent is a
small molecule drug,
[0069] In one embodiment, the method of treatment is directed to
the treatment of diabetes, hyperglycemia and/or obesity using, for
example, formulations comprising glucagon-like peptide 1 (GLP-1),
oxyntomodulin (OXN), or peptide YY(3-36) (PYY) either alone or in
combination with one another, or in combination with one or more
other active agents. In one embodiment, the method of treatment
comprises administration of a formulation which does not contain
GLP-1.
[0070] The incretin hormones GLP-1 and gastric inhibitory
polypeptide (GIP) are produced by the endocrine cells of the
intestine following ingestion of food. GLP-1 and GIP stimulate
insulin secretion from the beta cells of the islets of Langerhans
in the pancreas. Only GLP-1 causes insulin secretion in the
diabetic state; however; the GLP-1 protein itself has been
ineffective as a clinical treatment for diabetes when delivered by
injection as it has a very short half-life in vivo. Exenatide
(BYETTA.RTM.) is a 39-amino-acid peptide, is an insulin
secretagogue with glucoregulatory effects which bears a 50% amino
acid homology to GLP-1 and has a longer half-life in vivo.
Exenatide is a synthetic version of exendin-4, a hormone found in
the saliva of the Gila monster.
[0071] In an exemplary embodiment, a method for treating obesity,
diabetes and/or hyperglycemia comprises administering to a patient
in need of treatment a dry powder composition or formulation
comprising GLP-1, which stimulates the rapid secretion of
endogenous insulin from pancreatic .beta.-cells without causing
unwanted side effects such as profuse sweating, nausea, and
vomiting. In one embodiment, the method of treating disease can be
applied to a patient, including a mammal, suffering with obesity,
Type 2 diabetes mellitus and/or hyperglycemia at dosages ranging
from about 0.02 to about 3 mg of GLP-1 in the formulation in a
single dose. The method of treating hyperglycemia, diabetes, and/or
obesity can be designed so that the patient can receive at least
one dose of a GLP-1 formulation in proximity to a meal or snack. In
this embodiment, the dose of GLP-1 can be selected depending on the
patient's requirements. In one embodiment, pulmonary administration
of GLP-1 can comprise a GLP-1 dose greater than 3 mg for example,
in treating patients with type 2 diabetes.
[0072] In embodiments of the invention, the GLP-1 formulation is
administered by inhalation such as by pulmonary administration. In
this embodiment, pulmonary administration can be accomplished by
providing the GLP-1 in a dry powder formulation for inhalation. The
dry powder formulation is a stable composition and can comprise
microparticles which are suitable for inhalation and which dissolve
rapidly in the lung and rapidly deliver GLP-1 to the pulmonary
circulation. Suitable particle sizes for pulmonary administration
can be less than 10 .mu.m in diameter, and preferably less than 5
.mu.m. Exemplary particle sizes that can reach the pulmonary
alveoli range from about 0.5 .mu.m to about 5.8 .mu.m in diameter.
Such sizes refer particularly to aerodynamic diameter, but often
also correspond to actually physical diameter as well. Such
particles can reach the pulmonary capillaries, and can avoid
extensive contact with the peripheral tissue in the lung. In this
embodiment, the drug can be delivered to the arterial circulation
in a rapid manner and avoid degradation of the active ingredient by
enzymes or other mechanisms prior to reaching its target or site of
action in the body. In one embodiment, dry powder compositions for
pulmonary inhalation comprising GLP-1 and FDKP can comprise
microparticles wherein from about 35% to about 75% of the
microparticles have an aerodynamic diameter of less than 5.8
.mu.m.
[0073] The methods of delivery presented in various embodiments of
the present invention can provide a more direct path to an active
agent's site of action. Thus in addition to the avoidance of
degradation, though in some instances still in part due to it, the
biodistribution of the active agent can differ from that achieved
with modes of delivery that entail absorption into and travel
through the venous circulation prior to reaching sites of action in
the body. Thus, sampling of venous blood to determine active agent
concentration may underestimate the concentration of active agent
at a site of action when using embodiments of the present
disclosure while, in comparison, overestimating it when other modes
of administration are used. The more labile an active agent is the
greater this effect can be. For active agents such as GLP-1, with
multiple effects and sites of action, a different constellation of
effects may be observed as the relative concentrations at different
sites of action will differ from that achieved using other modes of
administration. This can further contribute to greater effective
bioavailability, avoidance of unwanted effects, and the like.
[0074] In one embodiment, the dry powder formulation for use with
the methods comprises particles comprising a GLP-1 molecule and a
diketopiperazine or a pharmaceutically acceptable salt thereof. In
this and other embodiments, the dry powder composition of the
present invention comprises one or more GLP-1 molecules selected
from the group consisting of a native GLP-1, a GLP-1 metabolite, a
long acting GLP-1, a GLP-1 derivative, a GLP-1 mimetic, an exendin,
or an analog thereof. GLP-1 analogs include, but are not limited to
GLP-1 fusion proteins, such as albumin linked to GLP-1.
[0075] In an exemplary embodiment, the method comprises the
administration of the peptide hormone GLP-1 to a patient for the
treatment of hyperglycemia and/or diabetes, and obesity. The method
comprises administering to a patient in need of treatment an
effective amount of an inhalable composition or formulation
comprising a dry powder formulation comprising GLP-1 which
stimulates the rapid secretion of endogenous insulin from
pancreatic .beta.-cells without causing unwanted side effects,
including, profuse sweating, nausea, and vomiting. In one
embodiment, the method of treating disease can be applied to a
patient, including a mammal, suffering with Type 2 diabetes
mellitus and/or hyperglycemia at dosages ranging from about 0.01 mg
to about 3 mg, or from about 0.2 mg to about 2 mg of GLP-1 in the
dry powder formulation. In one embodiment, the patient or subject
to be treated is a human. The GLP-1 can be administered immediately
before a meal (preprandially), at mealtime (prandially), and/or at
about 15, 30 or 45 minutes after a meal (postprandially). In one
embodiment, a single dose of GLP-1 can be administered immediately
before a meal and another dose can be administered after a meal. In
a particular embodiment, about 0.5 mg to about 1.5 mg of GLP-1 can
be administered immediately before a meal, followed by 0.5 mg to
about 1.5 mg about 30 minutes after a meal. In this embodiment, the
GLP-1 can be formulated with inhalation particles such as a
diketopiperazines with or without pharmaceutical carriers and
excipients. In one embodiment, pulmonary administration of the
GLP-1 formulation can provide plasma concentrations of GLP-1
greater than 100 pmol/L without inducing unwanted adverse side
effects, such as profuse sweating, nausea and vomiting to the
patient.
[0076] In another embodiment, a method for treating a patient
including a human with type 2 diabetes and hyperglycemia is
provided, the method comprises administering to the patient an
inhalable GLP-1 formulation comprising GLP-1 in a concentration of
from about 0.5 mg to about 3 mg in FDKP microparticles wherein the
levels of glucose in the blood of the patient are reduced to
fasting plasma glucose concentrations of from 85 to 70 mg/dL within
about 20 min after dosing without inducing nausea or vomiting in
the patient. In one embodiment, pulmonary administration of GLP-1
at concentration greater than 0.5 mg in a formulation comprising
FDKP microparticles lacks inhibition of gastric emptying.
[0077] In one embodiment, GLP-1 can be administered either alone as
the active ingredient in the composition, or with a dipeptidyl
peptidase (DPP-IV) inhibitor such as sitagliptin or vildagliptin,
or with one or more other active agents. DPP-IV is a ubiquitously
expressed serine protease that exhibits postproline or alanine
peptidase activity, thereby generating biologically inactive
peptides via cleavage at the N-terminal region after X-proline or
X-alanine, wherein X refers to any amino acid. Because both GLP-1
and GIP (glucose-dependent insulinotropic peptide) have an alanine
residue at position 2, they are substrates for DPP-IV. DPP-IV
inhibitors are orally administered drugs that improve glycemic
control by preventing the rapid degradation of incretin hormones,
thereby resulting in postprandial increases in levels of
biologically active intact GLP-1 and GIP.
[0078] In this embodiment, the action of GLP-1 can be further
prolonged or augmented in vivo if required, using DPP-IV
inhibitors. The combination of GLP-1 and DPP-IV inhibitor therapy
for the treatment of hyperglycemia and/or diabetes allows for
reduction in the amount of active GLP-1 that may be needed to
induce an appropriate insulin response from the .beta.-cells in the
patient. In another embodiment, the GLP-1 can be combined, for
example, with other molecules other than a peptide, such as, for
example, metformin. In one embodiment, the DPP-IV inhibitor or
other molecules, including metformin, can be administered by
inhalation in a dry powder formulation together with the GLP-1 in a
co-formulation, or separately in its own dry powder formulation
which can be administered concurrently with or prior to GLP-1
administration. In one embodiment, the DPP-IV inhibitor or other
molecules, including metformin, can be administered by other routes
of administration, including orally. In one embodiment, the DPP-IV
inhibitor can be administered to the patient in doses ranging from
about 1 mg to about 100 mg depending on the patient's need. Smaller
concentrations of the DPP-IV inhibitor may be used when
co-administered, or co-formulated with GLP-1. In this embodiment,
the efficacy of GLP-1 therapy may be improved at reduced dosage
ranges when compared to current dosage forms.
[0079] In embodiments described herein, GLP-1 can be administered
at mealtime (in proximity in time to a meal or snack). In this
embodiment, GLP-1 exposure can be limited to the postprandial
period so it does not cause the long acting effects of current
therapies. In embodiments wherein a DPP-IV inhibitor is
co-administered, the DPP-IV inhibitor may be given to the patient
prior to GLP-1 administration at mealtime. The amounts of DPP-IV
inhibitor to be administered can range, for example, from about
0.10 mg to about 100 mg, depending on the route of administration
selected. In further embodiments one or more doses of the GLP-1 can
be administered after the beginning of the meal instead of or in
addition to a dose administered in proximity to the beginning of a
meal or snack. For example one or more doses can be administered 15
to 120 minutes after the beginning of a meal, such as at 30, 45,
60, or 90 minutes.
[0080] In one embodiment, the drug delivery system can be utilized
in a method for treating obesity so as to control or reduce food
consumption in an animal such as a mammal. In this embodiment,
patients in need of treatment or suffering with obesity are
administered a therapeutically effective amount of an inhalable
composition or formulation comprising GLP-1, an exendin,
oxyntomodulin, peptide YY(3-36), or combinations thereof, or
analogs thereof, with or without additional appetite suppressants
known in the art. In this embodiment, the method is targeted to
reduce food consumption, inhibit food intake in the patient,
decrease or suppress appetite, and/or control body weight. In
another embodiment, the composition does not include GLP-1.
[0081] In one embodiment, the inhalable formulation comprises a dry
powder formulation comprising the above-mentioned active ingredient
with a diketopiperazine, including
2,5-diketo-3,6-di(4-X-aminobutyl)piperazine; wherein X is selected
from the group consisting of succinyl, glutaryl, maleyl, and
fumaryl, or a salt of the diketopiperazine. In this embodiment, the
inhalable formulation can comprise microparticles for inhalation
comprising the active ingredient with the aerodynamic
characteristics as described above. In one embodiment, the amount
of active ingredient can be determined by one of ordinary skill in
the art, however, the present microparticles can be loaded with
various amounts of active ingredient as needed by the patient. For
example, for oxyntomodulin, the microparticles can comprise from
about 1% (w/w) to about 75% (w/w) of the active ingredient in the
formulation. In certain embodiments, the inhalable formulations can
comprise from about 10% (w/w) to about 30% (w/w) of the
pharmaceutical composition and can also comprise a pharmaceutically
acceptable carrier, or excipient, such as a surfactant, such as
polysorbate 80. In this embodiment, oxyntomodulin can be
administered to the patient from once to about four times a day or
as needed by the patient with doses ranging from about 0.05 mg up
to about 5 mg in the formulation. In particular embodiments, the
dosage to be administered to a subject can range from about 0.1 mg
to about 3.0 mg of oxyntomodulin. In one embodiment, the inhalable
formulation can comprise from about 50 pmol to about 700 pmol of
oxyntomodulin in the formulation.
[0082] In embodiments disclosed herein wherein PYY is used as the
active ingredient, a dry powder formulation for pulmonary delivery
can be made comprising from about 0.10 mg to about 3.0 mg of PYY
per dose. In certain embodiments, the formulation can comprise a
dry powder comprising PYY in an amount ranging from about 1% to
about 75% (w/w) of the peptide in the formulation. In particular
embodiments, the amount of PYY in the formulation can be 5%, 10%,
15%, or 20% (w/w) and further comprising a diketopiperazine. In one
embodiment, the PYY is administered in a formulation comprising a
diketopiperazine, such as FDKP or a salt thereof, including sodium
salts. In certain embodiments, PYY can be administered to a subject
in dosage forms so that plasma concentrations of PYY after
administration are from about 4 pmol/L to about 100 pmol/L or from
about 10 pmol/L to about 50 pmol/L. In another embodiment, the
amount of PYY can be administered, for example, in amounts ranging
from about 0.01 mg to about 30 mg, or from about 5 mg to about 25
mg in the formulation. Other amounts of PYY can be determined as
described, for example, in Savage et al. Gut 1987 February;
28(2):166-70; which disclosure is incorporated by reference herein.
The PYY and/or analog, or oxyntomodulin and/or analog formulation
can be administered preprandially, prandially, periprandially, or
postprandially to a subject, or as needed and depending on the
patient physiological condition.
[0083] In one embodiment, the formulation comprising the active
ingredient can be administered to the patient in a dry powder
formulation by inhalation using a dry powder inhaler such as the
inhaler disclosed, for example, in U.S. Pat. No. 7,305,986 and U.S.
patent application Ser. No. 10/655,153 (US 2004/0182387), which
disclosures are incorporated herein by reference. Repeat inhalation
of dry powder formulation comprising the active ingredient can also
be administered between meals and daily as needed. In some
embodiments, the formulation can be administered once, twice, three
or four times a day.
[0084] In still yet a further embodiment, the method of treating
hyperglycemia and/or diabetes comprises the administration of an
inhalable dry powder composition comprising a diketopiperazine
having the formula 2,5-diketo-3,6-di(4-X-aminobutyl)piperazine,
wherein X is selected from the group consisting of succinyl,
glutaryl, maleyl, and fumaryl. In this embodiment, the dry powder
composition can comprise a diketopiperazine salt. In still yet
another embodiment of the present invention, there is provided a
dry powder composition, wherein the diketopiperazine is
2,5-diketo-3,6-di-(4-fumaryl-aminobutyl)piperazine, with or without
a pharmaceutically acceptable carrier, or excipient.
[0085] In certain embodiments, the method of treatment can comprise
a dry powder formulation for inhalation comprising GLP-1, wherein
the GLP-1 molecule is native GLP-1, or an amidated GLP-1 molecule,
wherein the amidated GLP-1 molecule is GLP-1(7-36) amide, or
combinations thereof. In one embodiment, the GLP-1 can be an analog
such as exenatide.
[0086] In one embodiment, a patient is administered an inhalable
GLP-1 formulation in a dosing range wherein the amount of GLP-1 is
from about 0.01 mg to about 3 mg, or from about 0.02 mg to about
2.5 mg, or from about 0.2 mg to about 2 mg of the formulation. In
one embodiment, a patient with type 2 diabetes can be given a GLP-1
dose greater than 3 mg. In this embodiment, the GLP-1 can be
formulated with inhalation particles such as a diketopiperazines
with or without pharmaceutical carriers and excipients. In one
embodiment, pulmonary administration of the GLP-1 formulation can
provide plasma concentrations of GLP-1 greater than 100 pmol/L
without inducing unwanted adverse side effects, such as profuse
sweating, nausea and vomiting to the patient.
[0087] In another embodiment, GLP-1 can be administered with
insulin as a combination therapy and given prandially for the
treatment of hyperglycemia and/or diabetes, for example, Type 2
diabetes mellitus. In this embodiment, GLP-1 and insulin can be
co-formulated in a dry powder formulation or administered
separately to a patient in their own formulation. In one
embodiment, wherein the GLP-1 and insulin are co-administered, both
active ingredients can be co-formulated, for example, the GLP-1 and
insulin can be prepared in a dry powder formulation for inhalation
using a diketopiperazine particle as described above.
Alternatively, the GLP-1 and insulin can be formulated separately,
wherein each formulation is for inhalation and comprise a
diketopiperazine particle. In one embodiment the GLP-1 and the
insulin formulations can be admixed together in their individual
powder form to the appropriate dosing prior to administration. In
this embodiment, the insulin can be short-, intermediate-, or
long-acting insulin and can be administered prandially.
[0088] In one embodiment for the treatment of Type 2 diabetes using
co-administration of GLP-1 and insulin, an inhalable formulation of
GLP-1 can be administered to a patient prandially, simultaneously,
or sequentially to an inhalable formulation of insulin such as
insulin/FDKP. In this embodiment, in a Type 2 diabetic, GLP-1 can
stimulate insulin secretion from the patient's pancreas, which can
delay disease progression by preserving .beta.-cell function (such
as by promoting (3-cell growth) while prandially-administered
insulin can be used as insulin replacement which mimics the body's
normal response to a meal. In certain embodiments of the
combination therapy, the insulin formulation can be administered by
other routes of administration. In this embodiment, the combination
therapy can be effective in reducing insulin requirements in a
patient to maintain the euglycemic state. In one embodiment, the
combination therapy can be applied to patients suffering with
obesity and/or Type 2 diabetes who have had diabetes for less than
10 years and are not well controlled on diet and exercise or
secretagogues. In one embodiment, the patient population for
receiving GLP-1 and insulin combination therapy can be
characterized by having .beta.-cell function greater than about 25%
of that of a normal healthy individual and/or, insulin resistance
of less than about 8% and/or can have normal gastric emptying. In
one embodiment, the inhalable GLP-1 and insulin combination therapy
can comprise a rapid acting insulin such as insulin
glulisine)(APIDRA.RTM., insulin lispro (HUMALOG.RTM.) or insulin
aspart (NOVOLOG.RTM.), or a long acting insulin such as insulin
detemir (LEVEMIR.RTM.) or insulin glargine (LANTUS.RTM.), which can
be administered by an inhalation powder also comprising FDKP or by
other routes of administration.
[0089] In another embodiment, a combination therapy for treating
type 2 diabetes can comprise administering to a patient in need of
treatment an effective amount of an inhalable insulin formulation
comprising an insulin and a diketopiperazine, wherein the insulin
can be a native insulin peptide, a recombinant insulin peptide, and
further administering to the patient a long acting insulin analog
which can be provided by inhalation in a formulation comprising a
diketopiperazine or by another route of administration such as by
subcutaneous injection. The method can further comprise the step of
administering to the patient an effective amount of a DPP IV
inhibitor. In one embodiment, the method can comprise administering
to a patient in need of treatment, a formulation comprising a rapid
acting or long acting insulin molecule and a diketopiperazine in
combination with formulation comprising a long acting GLP-1, which
can be administered separately and/or sequentially. GLP-1 therapy
for treating diabetes in particular type 2 diabetes can be
advantageous since administration of GLP-1 alone in a dry powder
inhalable formulation or in combination with insulin or non-insulin
therapies can reduce the risk of hypoglycemia.
[0090] In another embodiment, rapid acting GLP-1 and a
diketopiperazine formulation can be administered in combination
with a long acting GLP-1, such as exendin, for the treatment of
diabetes, which can be both administered by pulmonary inhalation.
In this embodiment, a diabetic patient suffering, for example, with
Type 2 diabetes, can be administered prandially an effective amount
of an inhalable formulation comprising GLP-1 so as to stimulate
insulin secretion, while sequentially or sometime after such as
from mealtime up to about 45 min, thereafter administering a dose
of exendin-4. Administration of inhalable GLP-1 can prevent disease
progression by preserving .beta.-cell function while exendin-4 can
be administered twice daily at approximately 10 hours apart, which
can provide basal levels of GLP-1 that can mimic the normal
physiology of the incretin system in a patient. Both rapid acting
GLP-1 and a long acting GLP-1 can be administered in separate,
inhalable formulations. Alternatively, the long acting GLP-1 can be
administered by other methods of administration including, for
example, transdermally, intravenously or subcutaneously. In one
embodiment, prandial administration of a short-acting and long
acting GLP-1 combination may result in increased insulin secretion,
greater glucagon suppression and a longer delay in gastric emptying
compared to long acting GLP-1 administered alone. The amount of
long acting GLP-1 administered can vary depending on the route of
administration. For example, for pulmonary delivery, the long
acting GLP-1 can be administered in doses from about 0.1 mg to
about 1 mg per administration, immediately before a meal or at
mealtime, depending on the form of GLP-1 administered to the
patient.
[0091] In one embodiment, the present method can be applied to the
treatment of obesity. A therapeutically effective amount of an
inhalable GLP-1 formulation can be administered to a patient in
need of treatment, wherein an inhalable dry powder, GLP-1
formulation comprises GLP-1 and a diketopiperazine as described
above. In this embodiment, the inhalable GLP-1 formulation can be
administered alone or in combination with one or more endocrine
hormone and/or anti-obesity active agents for the treatment of
obesity. Exemplary endocrine hormones and/or anti-obesity active
agents include, but are not limited to, peptide YY, oxyntomodulin,
amylin, amylin analogs such as pramlintide acetate, and the like.
In one embodiment, the anti-obesity agents can be administered in a
co-formulation in a dry powder inhalable composition alone or in
combination with GLP-1 together or in a separate inhalable dry
powder composition for inhalation. Alternatively, in the
combination of GLP-1 with one or more anti-obesity agents, or
agents that can cause satiety, the GLP-1 formulation can be
administered in a dry powder formulation and the anti-obesity agent
can be administered by alternate routes of administration. In this
embodiment, a DPP-IV inhibitor can be administered to enhance or
stabilize GLP-1 delivery into the pulmonary arterial circulation.
In another embodiment, the DPP-IV inhibitor can be provided in
combination with an insulin formulation comprising a
diketopiperazine. In this embodiment, the DPP-IV inhibitor can be
formulated in a diketopiperazine for inhalation or it can be
administered in other formulation for other routes of
administration such as by subcutaneous injection or oral
administration.
[0092] In an embodiment, a kit for treating diabetes and/or
hyperglycemia is provided which comprises a medicament cartridge
for inhalation comprising a GLP-1 formulation and an inhalation
device which is configured to adapt or securely engage the
cartridge. In this embodiment, the kit can further comprise a
DPP-IV inhibitor co-form ulated with GLP-1, or in a separate
formulation for inhalation or oral administration as described
above. In variations of this embodiment, the kit does not include
the inhalation device which can be provided separately.
[0093] In one embodiment, the present combination therapy using the
drug delivery system can be applied to treat metabolic disorders or
syndromes. In this embodiment, the drug delivery formulation can
comprise a formulation comprising a diketopiperazine and an active
agent, including GLP-1 and/or a long acting GLP-1 alone or in
combination with one or more active agents such as a DPP-IV
inhibitor and exendin, targeted to treat the metabolic syndrome. In
this embodiment, at least one of the active agents to be provided
to the subject in need of treatment and who may exhibit insulin
resistance can be administered by pulmonary inhalation.
[0094] In another embodiment, the pulmonary administration of an
inhalable dry powder formulation comprising GLP-1 and a
diketopiperazine can be used as a diagnostic tool to diagnose the
level or degree of progression of type 2 diabetes in a patient
afflicted with diabetes in order to identify the particular
treatment regime suitable for the patient to be treated. In this
embodiment, a method for diagnosing the level of diabetes
progression in a patient identified as having diabetes, the method
comprising administering to the patient a predetermined amount of
an inhalable dry powder formulation comprising GLP-1 and a
diketopiperazine and measuring the endogenous insulin production or
response. The administration of the inhalable dry powder
formulation comprising GLP-1 can be repeated with predetermined
amounts of GLP-1 until the appropriate levels of an insulin
response is obtained for that patient to determine the required
treatment regime required by the patient. In this embodiment, if a
patient insulin response is inadequate, the patient may require
alternative therapies. Patients who are sensitive or
insulin-responsive can be treated with a GLP-1 formulation
comprising a diketopiperazine as a therapy. In this manner, the
specific amount of GLP-1 can be administered to a patient in order
to achieve an appropriate insulin response to avoid hypoglycemia.
In this and other embodiments, GLP-1 can induce a rapid release of
endogenous insulin which mimics the normal physiology of insulin
release.
[0095] In one embodiment, the present drug delivery system can be
applied to treat metabolic disorders or syndromes. In this
embodiment, the drug delivery formulation can comprise a
formulation comprising a diketopiperazine and an active agent,
including GLP-1 and/or a long acting GLP-1 alone or in combination
with one or more active agents such as a DPP-IV inhibitor and
exendin, targeted to treat the metabolic syndrome. In this
embodiment, at least one of the active agents to be provided to the
subject in need of treatment and who may exhibit insulin resistance
can be administered by pulmonary inhalation. In another embodiment,
the drug formulation does not include GLP-1.
EXAMPLES
[0096] The following examples are included to demonstrate certain
embodiments of the invention. It should be appreciated by those of
skill in the art that the techniques disclosed in the examples
elucidate representative techniques that function well in the
practice of the present invention. However, those of skill in the
art should, in light of the present disclosure, appreciate that
many changes can be made in the specific embodiments that are
disclosed and still obtain a like or similar result without
departing from the spirit and scope of the invention.
Example 1
Administration of GLP-1 in an Inhalable Dry Powder to Healthy Adult
Males
[0097] GLP-1 has been shown to control elevated blood glucose in
humans when given by intravenous (iv) or subcutaneous (sc)
infusions or by multiple subcutaneous injections. Due to the
extremely short half-life of the hormone, continuous subcutaneous
infusion or multiple daily subcutaneous injections would be
required to achieve clinical efficacy. Neither of these routes is
practical for prolonged clinical use. Applicants have found in
animal experiments that when GLP-1 was administered by inhalation,
therapeutic levels could be achieved. The results of these studies
can be found, for example, in U.S. patent application Ser. No.
11/735,957, the disclosure of which is incorporated by reference
herein.
[0098] In healthy individuals, several of the actions of GLP-1,
including reduction in gastric emptying, increased satiety, and
suppression of inappropriate glucagon secretion appear to be linked
to the burst of GLP-1 released as meals begin. By supplementing
this early surge in GLP-1 with a formulation of GLP-1 and
2,5-diketo-3,6-di(4-fumaryl-aminobutyl)piperazine (FDKP) as an
inhalation powder, a pharmacodynamic response, including endogenous
insulin production, reduction in glucagon and glucose levels, in
diabetic animals can be elicited. In addition, the late surge in
native GLP-1 linked to increased insulin secretion can be mimicked
by postprandial administration of GLP-1/FDKP inhalation powder.
[0099] A Phase 1a clinical trials of GLP-1/FDKP inhalation powder
was designed to test the safety and tolerability of selected doses
of a new inhaled glycemic control therapeutic product for the first
time in human subjects. GLP-1/FDKP inhalation powder was
administered using the MedTone.RTM. Inhaler device, previously
tested. The experiments were designed to identify the safety and
tolerability of various doses of GLP-1/FDKP inhalation powder by
pulmonary inhalation. Doses were selected for human use based on
animal safety study results from non-clinical studies in rats and
primates using GLP-1/FDKP administered by inhalation as described
in U.S. application Ser. No. 11/735,957, which is incorporated
herein by reference.
[0100] Twenty-six subjects were enrolled into 5 cohorts to provide
up to 4 evaluable subjects in each of cohorts 1 and 2 and up to 6
evaluable subjects in each of cohorts 3 to 5 who met eligibility
criteria and completed the study. Each subject was dosed once with
GLP-1 as GLP-1/FDKP inhalation powder at the following dose levels:
cohort 1: 0.05 mg; cohort 2: 0.45 mg; cohort 3: 0.75 mg; cohort 4:
1.05 mg and cohort 5: 1.5 mg of GLP-1. Dropouts were not replaced.
These dosages assumed a body mass of 70 kg. Persons of ordinary
skill in the art can determine additional dosage levels based on
the studies disclosed herein.
[0101] In these experiments, the safety and tolerability of
ascending doses of GLP-1/FDKP inhalation powder in healthy adult
male subjects were determined. The tolerability of ascending doses
of GLP-1/FDKP inhalation powder were determined by monitoring
pharmacological or adverse effects on variables including reported
adverse events (AE), vital signs, physical examinations, clinical
laboratory tests and electrocardiograms (ECG).
[0102] Additional pulmonary safety and pharmacokinetic parameters
were also evaluated. Pulmonary safety as expressed by the incidence
of pulmonary and other adverse events and changes in pulmonary
function between Visit 1 (Screening) and Visit 3 (Follow-up) was
studied. Pharmacokinetic (PK) parameters of plasma GLP-1 and serum
fumaryl diketopiperazine (FDKP) following dosing with GLP-1/FDKP
inhalation powder were measured as AUC.sub.0-120 min plasma GLP-1
and AUC.sub.0-480 min serum FDKP. Additional PK parameters of
plasma GLP-1 included the time to reach maximal plasma GLP-1
concentration, T.sub.max plasma GLP-1; the maximal concentration of
GLP-1 in plasma, C.sub.max plasma GLP-1, and the half of total time
to reach maximal concentration of GLP-1 in plasma, T.sub.1/2 plasma
GLP-1. Additional PK parameters of serum FDKP included T.sub.max
serum FDKP, C.sub.max serum FDKP, and T.sub.1/2 serum FDKP.
Clinical trial endpoints were based on a comparison of the
following pharmacological and safety parameters determined in the
trial subject population. Primary endpoints included the incidence
and severity of reported AEs, including cough and dyspnea, nausea
and/or vomiting, as well as changes from screening in vital signs,
clinical laboratory tests and physical examinations. Secondary
endpoints included pharmacokinetic disposition of plasma GLP-1 and
serum FDKP (AUC.sub.0-120 min plasma GLP-1 and AUC.sub.0-480 min
serum FDKP), plasma GLP-1 (T.sub.max plasma GLP-1, C.sub.max plasma
GLP-1 T.sub.1/2 plasma GLP-1); serum FDKP (T.sub.max serum FDKP,
C.sub.max serum FDKP); pulmonary function tests (PFTs), and
ECG.
[0103] The clinical trial consisted of 3 clinic visits: 1) One
screening visit (Visit 1); 2) One treatment visit (Visit 2); and 3)
One follow-up visit (Visit 3) 8-14 days after Visit 2. A single
dose of GLP-1/FDKP inhalation powder was administered at Visit
2.
[0104] Five doses of GLP-1/FDKP inhalation powder (0.05, 0.45,
0.75, 1.05 and 1.5 mg of GLP-1) were assessed. To accommodate all
doses, formulated GLP-1/FDKP was mixed with FDKP inhalation powder
containing particles without active agent. Single-dose cartridges
containing 10 mg dry powder consisting of GLP-1/FDKP inhalation
powder (15% weight to weight GLP-1/FDKP) as is or mixed with the
appropriate amount of FDKP inhalation powder was used to obtain the
desired dose of GLP-1 (0.05 mg, 0.45 mg, 0.75 mg, 1.05 mg and 1.5
mg). The first 2 lowest dose levels were evaluated in 2 cohorts of
4 subjects each and the 3 higher dose levels were evaluated in 3
cohorts of 6 subjects each. Each subject received only 1 dose at 1
of the 5 dose levels assessed. In addition to blood drawn for GLP-1
(active and total) and FDKP measurements, samples were drawn for
glucagon, glucose, insulin, and C-peptide determination. The
results from these experiments are described with reference to the
following figures and tables.
[0105] FIG. 1 depicts the active GLP-1 plasma concentration in
cohort 5 after pulmonary administration of 1.5 mg of GLP-1 dose.
The data showed that the peak GLP-1 concentration occurred prior to
the first sampling point at 3 minutes, closely resembling
intravenous (IV) bolus administration. GLP-1 plasma concentrations
in some subjects were greater than 500 pmol/L, the assay limit.
Peak active GLP-1 plasma concentrations range from about 150 pmol/L
to about 500 pmol/L. Intravenous bolus administration of GLP-1 as
reported in the literature (Vilsboll et al. 2000) results in ratios
of total:active GLP-1 of 3.0-5.0 compared to a ratio of 1.5 in
cohort 5 of this study. At comparable active concentrations the
metabolite peaks were 8-9 fold greater following intravenous
administration compared to pulmonary administration, suggesting
that pulmonary delivery results in rapid delivery and less
degradation of GLP-1.
TABLE-US-00001 TABLE 1 Treatment 0.05 mg 0.45 mg 0.75 mg 1.05 mg
1.5 mg Parameter.sup.a (n = 4) (n = 4) (n = 6) (n = 6) (n = 6)
GLP-1.sup.a AUC.sub.0-120 ND n = 1 n = 6 n = 4 n = 4 (min*pmol/L)
355.33 880.12 1377.88 AULQ (195.656) (634.054) C.sub.max (pmol/L) n
= 4 n = 4 n = 6 n = 6 n = 6 2.828 24.630 81.172 147.613 310.700
(2.4507) (8.7291) (63.3601) (122.7014 (54.2431) t.sub.max (min) n =
4 n = 4 n = 6 n = 6 n = 6 3.00 3.00 3.00 3.00 3.00 (3.00, 3.00)
(3.00, 4.02) (3.00, 6.00) (3.00, 4.98) (3.00, 3.00) T.sub.1/2 (min)
n = 1 n = 3 n = 6 n = 4 n = 6 6.1507 3.0018 5.5000 3.6489 3.9410
(0.83511) (2.96928) (1.88281) (1.79028) FDKP AUC.sub.0-120 n = 6 n
= 6 (min*pmol/L) 22169.2 25594.7 (4766.858) (5923.689) C.sub.max
(pmol/L) n = 6 n = 6 184.21 210.36 (56.893) (53.832) t.sub.max
(min) n = 6 n = 6 4.50 6.00 (3.00, 25.02) (3.00, 19.98) T.sub.1/2
(min) n = 6 n = 6 126.71 123.82 (11.578) (15.640) .sup.aAll
parameters are mean (SD) except tmax, which is median (range) AULQ
- Two or more subjects in the dose group had plasma concentrations
of the analyte that were AULQ; NA = The pharmacokinetic profile did
not meet the specifications for this profile because of the short
sampling time (20 minutes); ND = Parameter could not be calculated
because of insufficient data is some subjects.
[0106] In healthy individuals, physiological post-prandial venous
plasma concentrations of GLP-1 typically range from 10-20 pmol/L
(Vilsboll et al. J. Clin. Endocr. & Metabolism. 88(6):2706-13,
June 2003). These levels were achieved with some subjects in cohort
2, who received 0.45 mg GLP-1. Higher doses of GLP-1 produced peak
plasma GLP-1 concentrations substantially higher than physiological
peak venous concentrations. However, because the half-life of GLP-1
is short (about 1-2 min), plasma concentrations of active GLP-1
fell to the physiological range by 9 min after administration.
Although the peak concentrations are much higher than those seen
physiologically in the venous circulation, there is evidence that
local concentrations of GLP-1 may be much higher than those seen
systemically.
[0107] Table 1 shows the pharmacokinetic profile of GLP-1 in a
formulation comprising FDKP from this study.
[0108] FDKP pharmacokinetic parameters are also represented in
Table 1 for cohorts 4 and 5. Other cohorts were not analyzed. The
data also shows that mean plasma concentration of FDKP for the 1.05
mg and the 1.5 mg GLP-1 treated subjects were about 184 and 211
pmol/L, respectively. Maximal plasma FDKP concentrations were
attained at about 4.5 and 6 min after administration for the
respective dose with a half-life about 2 hr (127 and 123 min).
[0109] FIG. 2A depicts mean insulin concentrations in subjects
treated with an inhalable dry powder formulation of GLP-1 at a dose
of 1.5 mg. The data show the 1.5 mg GLP-1 dose induced endogenous
insulin release from p-cells since insulin concentrations were
detected in all subjects, and the mean peak insulin concentrations
of about 380 pmol/L occurred at 6 min after dosing or earlier. The
insulin release was rapid, but not sustained, since plasma insulin
concentration fell rapidly after the initial response to GLP-1.
FIG. 2B depicts the GLP-1 plasma concentration of subjects treated
with the 1.5 mg dose of GLP administered by pulmonary inhalation
compared to subcutaneous administration of a GLP-1 dose. The data
illustrates that pulmononary administration of GLP-1 occurs
relatively fast and peak plasma concentration of GLP-1 occur faster
than with subcutaneous administration. Additionally, pulmonary
inhalation of GLP-1 leads to GLP-1 plasma concentrations returning
to basal levels much faster than with subcutaneous administration.
Thus the exposure of the patient to GLP-1 provided by pulmonary
inhalation using the present drug delivery system is shorter in
time than by subcutaneous administration and the total exposure to
GLP-1 as measured by AUC is less for the inhaled insulin. FIG. 2C
illustrates that pulmonary administration of a dry powder
formulation of GLP-1 induces an insulin response which is similar
to the response obtained after intravenous administration of GLP-1,
but different in peak time and amount of endogenous insulin
produced than with subcutaneous GLP-1 administration, which
indicates that pulmonary administration of GLP-1 using the present
formulation is more efficacious at inducing an insulin
response.
[0110] FIG. 3 depicts the plasma C-peptide concentrations in
subjects treated with an inhalable dry powder formulation
containing a GLP-1 dose of 1.5 mg measured at various times after
inhalation. The data demonstrate that C-peptide is released
following GLP-1 inhalation confirming endogenous insulin
release.
[0111] FIG. 4 depicts fasting plasma glucose concentrations in
subjects treated with the GLP-1 formulation containing GLP-1. Mean
fasting plasma glucose (FPG) concentrations were approximately 4.7
mmol/L for the 1.5 mg GLP-1 treated subjects. GLP-1 mediated
insulin release is glucose dependent. Hypoglycemia is not
historically observed in euglycemic subjects. In this experiment,
the data clearly show that glucose concentrations in these
euglycemic healthy subjects were reduced following pulmonary
administration of GLP-1. At the 1.5 mg GLP-1 dose, two of the six
subjects had glucose concentrations lowered by GLP-1 to below 3.5
mmol/L, the laboratory value that defines hypoglycemia. Plasma
glucose decreased more than 1.5 mol/L in two of the six subjects
that received the 1.5 mg GLP-1 dose. Moreover, decreases in plasma
glucose were correlated to the GLP-1 dose. The smallest decrease in
glucose concentration was seen with the 0.05 mg dose, and the
largest decrease was seen with the 1.5 mg dose. The three
intermediate doses of GLP-1 produced roughly equal decreases in
plasma glucose. The data indicate that the GLP-1 glucose-dependency
was overcome based on GLP-1 concentrations above the physiologic
range. Physiologic ranges for GLP-1 (7-36) amide in normal
individuals has been reported to be in the range of 5-10 pmol/L
during fasting, and increase rapidly after eating to 15 to 50
pmol/L (Drucker, D. and Nauck, M. The Lancet 368:1696-1705,
2006).
[0112] FIG. 5 further depicts insulin concentrations in plasma
after GLP-1 pulmonary administration are dose dependent. In most
subjects, the insulin release was not sustained, since plasma
insulin concentration fell rapidly after the initial response to
GLP-1 administration. In most subjects, the peak plasma insulin
response ranged from 200-400 pmol/L with one subject exhibiting
peak plasma insulin levels that exceeded 700 pmol/L. Thus, the data
indicate that insulin response is GLP-1 dose dependent.
[0113] FIG. 6 depicts glucagon concentrations in plasma after GLP-1
pulmonary administration at the various dosing groups. Baseline
glucagon levels ranged from 13.2 pmol/L to 18.2 pmol/L in the
various dose groups. The maximum change in plasma glucagon was seen
at 12 min after dosing. The largest decrease in plasma glucagon was
approximately 2.5 pmol/L and was seen in the 1.5 mg dose group. The
maximum suppression of glucagon secretion was potentially
underestimated because the minima did not always occur at 12
min.
[0114] Tables 2 and 3 report the adverse events or side effect
symptoms recorded for the patient population in the study. The list
of adverse events reported in the literature for GLP-1 administered
by injection is not extensive; and those reported have been
described as mild or moderate, and tolerable. The primary adverse
events reported have been profuse sweating, nausea and vomiting
when active GLP-1 concentrations exceed 100 pmol/L. As shown in
Tables 1 and 3, and FIG. 1, pulmonary administration at doses of
1.05 mg and 1.5 mg resulted in active GLP-1 concentrations greatly
exceeding 100 pmol/L without the side effects normally observed
with parenteral (subcutaneous, intravenous [either bolus or
infusion]) GLP-1. None of the subjects in this study reported
symptoms of nausea, profuse sweating or vomiting. Subjects in
Cohort 5 reached C.sub.max comparable to that observed with a 50
.mu.g/kg IV bolus data (reported by Vilsboll et al. 2000), where
the majority of subjects reported significant adverse events.
TABLE-US-00002 TABLE 2 Adverse Events 0.05 mg 0.45 mg 0.75 mg 1.05
mg 1.5 mg Adverse Event (n = 4) (n = 4) (n = 6) (n = 6) (n = 6)
Cough 3 1 3 5 5 Dysphonia 2 -- 2 3 3 Productive Cough -- -- 1 -- --
Throat Irritation -- -- -- 1 -- Headache 1 1 -- 1 1 Dizziness -- --
-- -- 2 Dysgeusia -- -- 1 -- -- Fatigue -- -- 1 1 1 Seasonal
Allergy -- -- -- 1 -- Rhinitis -- -- -- 1 -- Increased Appetite --
-- -- -- 1
TABLE-US-00003 TABLE 3 Comparative Adverse Events of GLP-1: IV vs.
Pulmonary Administration IV.sup..dagger. IV.sup..dagger.*
Pulmonary* Adverse Events (16.7 .mu.g) (50 .mu.g) (1.5 mg) Reduced
well-being 42% 100% 17% Nausea 33% 83% 0% Profuse sweating 17% 67%
0% .sup..dagger.Vilsboll et al. Diabetes Care, June 2000;
*Comparable C.sub.max
[0115] Tables 2 and 3 show there were no serious or severe adverse
events reported by any subjects in the study who received GLP-1 by
pulmonary inhalation. The most commonly reported adverse events
were those associated with inhalation of a dry powder, cough and
throat irritation. Surprisingly, in the patients treated by
pulmonary inhalation, no subject reported nausea or dysphoria, and
there was no vomiting associated with any of these subjects. The
inventors also found that pulmonary administration of GLP-1 in a
dry powder formulation lack inhibition of gastric emptying in the
above subjects (data not shown). Inhibition of gastric emptying is
a commonly encountered unwanted side effect associated with
injected standard formulations of GLP-1.
[0116] In summary, the clinical GLP-1/FDKP powder contained up to
15 wt % GLP-1 providing a maximum dose of 1.5 mg GLP-1 in 10 mg of
powder. Andersen cascade measurements indicated that 35-70% of the
particles had aerodynamic diameters <5.8 .mu.m. A dose of 1.5 mg
GLP-1 produced mean peak concentrations >300 pmol/L of active
GLP-1 at the first sampling time (3 min); resulted in mean peak
insulin concentrations of 375 pmol/L at the first measured time
point (6 min); reduced mean fasting plasma glucose from 85 to 70
mg/dL 20 min after dosing; and was well tolerated and did not cause
nausea or vomiting.
Example 2
Comparison of Pulmonary Administration of GLP-1 and Exenatide, and
Subcutaneous Administration of Exenatide to male Zucker Diabetic
Fat Rats
[0117] Much effort has been expended in developing analogs of GLP-1
with longer circulating half-lives to arrive at a clinically useful
treatment. As demonstrated herein pulmonary administration of GLP-1
also provides clinically meaningful activity. It was thus of
interest to compare these two approaches.
[0118] Preparation of FDKP Particles.
[0119] Fumaryl diketopiperazine (FDKP) and polysorbate 80 were
dissolved in dilute aqueous ammonia to obtain a solution containing
2.5 wt % FDKP and 0.05 wt % polysorbate 80. The FDKP solution was
then mixed with an acetic acid solution containing polysorbate 80
to form particles. The particles were washed and concentrated by
tangential flow filtration to achieve approximately 11% A solids by
weight.
[0120] Preparation of GLP-1 Stock Solution.
[0121] A 10 wt % GLP-1 stock solution was prepared in deionized
water by combining 60 mg GLP-1 solids (86.6% peptide) with 451 mg
deionized water. About 8 .mu.L glacial acetic acid was added to
dissolve the peptide.
[0122] Preparation of GLP-1/FDKP Particles.
[0123] A 1 g portion of the stock FDKP suspension (108 mg
particles) was transferred to a 2 mL polypropylene tube. The
appropriate amount of GLP-1 stock solution (Table 1) was added to
the suspension and gently mixed. The pH of the suspension was
adjusted from pH .about.3.5 to pH .about.4.5 by adding 1 .mu.L
aliquote of 50% (v/v) ammonium hydroxide. The GLP-1/FDKP particle
suspension was then pelleted into liquid nitrogen and lyophilized.
The dry powders were analyzed by high performance liquid
chromatography (HPLC) and found comparable to theoretical
values.
[0124] Preparation of Exenatide Stock Solution.
[0125] A 10 wt % exendin stock solution was prepared in 2% wt
acetic acid by combining 281 mg exendin solids (88.9% peptide) with
2219 mg 2% wt acetic acid.
[0126] Preparation of Exenatide/FDKP Particles.
[0127] A 1533 mg portion of a stock FDKP particle suspension (171
mg particles) was transferred to a 4 mL glass vial. A 304 mg
portion of exendin stock solution was added to the suspension and
gently mixed. The pH of the suspension was adjusted from pH
.about.3.7 to pH .about.4.5 by adding 3-5 .mu.L aliquots of 25%
(v/v) ammonium hydroxide. The exenatide/FDKP particle suspension
was then pelleted into liquid nitrogen and lyophilized. The dry
powders were analyzed by high performance liquid chromatography
(HPLC) and found comparable to theoretical values.
[0128] Pharmacokinetic and Pharmacodynamic Assessment in Rats.
[0129] Male Zucker Diabetic Fatty (ZDF) rats (5/group) were
assigned to one of four test groups. Animals were fasted overnight
then administered glucose (1 g/kg) by intraperitoneal injection
immediately prior to test article dosing. Animals in the control
group received air by pulmonary insufflation. Animals in Group 1
received exenatide (0.3 mg) in saline (0.1 mL) by subcutaneous (SC)
injections. Animals in Group 2 received 15% by weight
exenatide/FDKP (2 mg) by pulmonary insufflation. Animals in Group 3
received 15% by weight GLP-1/FDKP (2 mg) by pulmonary insufflation.
Blood samples were collected from the tail prior to dosing and at
15, 30, 45, 60, 90, 120, 240, and 480 min after dosing. Plasma was
harvested. Blood glucose and plasma GLP-1 or plasma exenatide
concentrations were determined.
[0130] Exenetide pharmacokinetics are reported in FIG. 7A. These
data showed that exenetide is absorbed rapidly following
insufflation of exenetide/FDKP powder. The bioavailability of the
inhaled exenetide was 94% compared to subcutaneous injection. This
may indicate that pulmonary administration is particularly
advantageous to exenatide. The time to maximum peak circulating
exenetide concentrations (T.sub.max) was 30 min in rats receiving
subcutaneous exenetide compared to <15 min in rats receiving
inhaled exenetide. This T.sub.max was similar to that of
insufflated GLP-1/FDKP (data not shown).
[0131] Comparative pharmacodynamics are reported in FIG. 8. These
data showed the changes in blood glucose for all four test groups.
Glucose excursions following the glucose tolerance test were lower
in animals receiving inhaled exenetide/FDKP as compared to animals
receiving SC exenetide. Since exenetide exposure was comparable in
both groups (FIG. 7), these data suggest that the shorter time to
peak exenetide concentrations in the exenetide/FDKP group provided
better glucose control. Additionally, glucose excursions were
comparable in animals receiving either GLP-1/FDKP or
exenetide/FDKP. These data are surprising because the circulating
half-life of exenetide (89 min) is considerably longer than that of
GLP-1 (15 min). Indeed, exenetide was developed to maximize
circulating half-life for the purpose of increasing efficacy. These
data suggest that the longer circulating half-life of exenetide
offers no advantage in controlling hyperglycemia when using
pulmonary administration. Moreover pulmonary administration of
either molecule provided superior blood glucose control the SC
exenatide.
[0132] FIG. 7 depicts mean plasma exendin concentrations in male
ZDF rats receiving exendin-4/FDKP powder formulation administered
by pulmonary insufflation versus subcutaneous exendin-4. The closed
squares represent the response following pulmonary insufflation of
exendin-4/FDKP powder. The open squares represent the response
following administration of subcutaneously administered exendin-4.
The data are plotted as .+-.standard deviation. The data show that
rats insufflated with powders providing GLP-1 doses of 0.12, 0.17,
and 0.36 mg produced maximum plasma GLP-1 concentrations
(C.sub.max) of 2.3, 4.9 and 10.2 nM and exposures (AUC) of 57.1
nMmin, 92.6 nMmin, and 227.9 nMmin, respectively (t.sub.max=10 min,
t.sub.1/2=10 min). In an intraperitoneal glucose tolerance test
conducted after 4 consecutive days of dosing 0.3 mg GLP-1 per day,
treated animals exhibited significantly lower glucose
concentrations than the control group (p<0.05). At 30 min
post-challenge, glucose increased by 47% in control animals but
only 17% in treated animals.
[0133] FIG. 8 depicts the change in blood glucose from baseline in
male ZDF rats receiving either air control, exendin-4/FDKP powder,
or GLP-1/FDKP powder via pulmonary insufflation versus subcutaneous
exendin-4 and exendin-4 administered by pulmonary insufflation. The
closed diamonds represent the response following pulmonary
insufflation of exendin-4/FDKP powder. The closed circles represent
the response following administration of subcutaneous exendin-4.
The closed triangles represent the response following
administration of GLP-1/FDKP powder. The closed squares represent
the response following pulmonary insufflation of air alone. The
open squares represent the response given by 2 mg of GLP-1/FDKP
given to the rats by insufflation followed by a 2 mg exendin-4/FDKP
powder administered also by insufflation.
Example 3
[0134] Oxyntomodulin/FDKP Powder Preparation.
[0135] Oxyntomodulin, also known as glucagon-37, is a peptide
consisting of 37 amino acid residues. The peptide was manufactured
and acquired from American Peptide Company, Inc. of Sunnyvale,
Calif. FDKP particles in suspension were mixed with an
oxyntomodulin solution, then flash frozen as pellets in liquid
nitrogen and lyophilized to produce sample powders.
[0136] Six powders were prepared with target peptide content
between 5% and 30%. Actual peptide content determined by HPLC was
between 4.4% and 28.5%. The aerodynamic properties of the 10%
peptide-containing powder were analyzed using cascade
impaction.
[0137] The FDKP solution was then mixed with an acetic acid
solution containing polysorbate 80 to form particles. The particles
were washed and concentrated by tangential flow filtration to
achieve approximately 11% A solids by weight.
[0138] FDKP particle suspension (1885 mg.times.11.14% solids=210 mg
FDKP particles) was weighed into a 4 mL clear glass vial. The vial
was capped and mixed using a magnetic stirrer to prevent settling.
Oxyntomodulin solution (909 mg of 10% peptide in 2 wt % acetic
acid) was added to the vial and allowed to mix. The final
composition ratio was approximately 30:70 oxyntomodulin:FDKP
particles. The oxyntomodulin/FDKP suspension had an initial pH of
4.00 which was adjusted to pH 4.48 by adding 2-10 .mu.L increments
of 1:4 (v/v) ammonium hydroxide/water. The suspension was pelleted
into a small crystallization dish containing liquid nitrogen. The
dish was placed in a freeze dryer and lyophilized at 200 mTorr. The
shelf temperature was ramped from -45.degree. C. to 25.degree. C.
at 0.2.degree. C./min and then held at 25.degree. C. for
approximately 10 hours. The resultant powder was transferred to a 4
mL clear glass vial. Total yield of the powder after transfer to
the vial was 309 mg (103%). Samples were tested for oxyntomodulin
content by diluting the oxyntomodulin preparation in sodium
bicarbonate and assaying by high pressure liquid chromatography in
a Waters 2695 separations system using deionized with 0.1%
trifluoroacetic acid (TFA) and acetonitrile with 0.1% TFA as mobile
phases, with the wavelength detection set at 220 and 280 nm. Data
was analyzed using a Waters Empower.TM. software program.
[0139] Pharmacokinetic and Pharmacodynamic Assessment in Rats.
[0140] Male ZDF rats (10/group) were assigned to one of four
groups. Animals in the one group received oxyntomodulin by
intravenous injection. Animals in the other three groups received
5% oxyntomodulin/FDKP powder (containing 0.15 mg oxyntomodulin),
15% oxyntomodulin/FDKP powder (containing 0.45 mg oxyntomodulin),
or 30% oxyntomodulin/FDKP powder (containing 0.9 mg oxyntomodulin)
by pulmonary insufflation. Blood samples were collected from the
tail prior to dosing and at various times after dosing for
measurement of plasma oxyntomodulin concentrations (FIG. 9A). Food
consumption was also monitored at various times after dosing with
oxyntomodulin (FIG. 9B).
[0141] FIG. 9A is a graph comparing the plasma concentrations of
oxyntomodulin following administration of an inhalable dry powder
formulation at various amounts in male ZDF rats and control rats
receiving oxyntomodulin by intravenous injection. These data show
that oxyntomodulin is absorbed rapidly following insufflation of
oxyntomodulin/FDKP powder. The time to maximum peak circulating
oxyntomodulin concentrations (T.sub.max) was less than 15 min in
rats receiving inhaled oxyntomodulin. This study shows that the
half life of oxyntomodulin is from about 22 to about 25 min after
pulmonary administration.
[0142] FIG. 9B is a bar graph showing cumulative food consumption
in male ZDF rats treated with intravenous oxyntomodulin or
oxyntomodulin/FDKP powder administered by pulomonary insufflation
compared to control animals receiving an air stream. The data show
that pulmonary administration of oxyntomodulin/FDKP reduced food
consumption to a greater extent than either intravenous
oxyntomodulin or air control with a single dose.
[0143] In a similar set of experiments, rats received an air stream
as control (Group 1) or 30% oxyntomodulin/FDKP powder by pulmonary
insufflation. Rats administered oxyntomodulin/FDKP inhalation
powder received doses of either 0.15 mg oxyntomodulin (as 0.5 mg of
oxyntomodulin/FDKP powder; Group 2), 0.45 mg oxyntomodulin (as 1.5
mg of oxyntomodulin/FDKP powder, Group 3) or 0.9 mg oxyntomodulin
(as 3 mg of oxyntomodulin/FDKP powder, Group 4) prepared as
described above. The studies were conducted in ZDF rats fasted for
24 hr prior to the start of the experiment. Rats were allowed to
eat after receiving the experimental dose. A predetermined amount
of food was given to the rats and the amount of food the rats
consumed was measured at various times after the start of the
experiment. The oxyntomodulin/FDKP dry powder formulation was
administered to the rats by pulmonary insufflation and food
measurements and blood samples were taken at various points after
dosing.
[0144] FIGS. 10A and 10B show circulating oxyntomodulin
concentrations for all test animals and the change in food
consumption from control, respectively. Rats given oxyntomodulin
consumed significantly less food than the control rats for up to 6
hr after dosing. Higher doses of oxyntomodulin appeared to suppress
appetite more significantly that the lower doses indicating that
appetite suppression is dose dependent, as the rats given the
higher dose consumed the least amount of food at all time points
measured after dosing.
[0145] Maximal concentrations of oxyntomodulin in blood were
detected at 10 to 30 min and that maximal concentration of
oxyntomodulin was dose dependent as the rats receiving 1.5 mg of
oxyntomodulin had a maximal plasma concentration of 311 .mu.g/mL
and rats receiving 3 mg of oxyntomodulin had a maximal plasma
concentration of 660 .mu.g/mL. The half-life (t.sub.1/2) of
oxyntomodulin in the Sprague Dawley rats after administration by
pulmonary insufflation ranged from about 25 to 51 min.
Example 4
Administration of GLP-1 in an Inhalable Dry Powder to Type 2
Diabetic Patients
[0146] A Phase 1 clinical trial of GLP-1/FDKP inhalation powder was
conducted in patients suffering with Type 2 diabetes mellitus to
assess the glucose levels of the patients before and after
treatment with GLP-1 dry powder formulation by pulmonary
inhalation. These studies were conducted according to Example 1 and
as described herein. GLP-1 inhalation powder was prepared as
described in U.S. patent application Ser. No. 11/735,957, which
disclosure is incorporated herein by reference. The dry inhalation
powder contained 1.5 mg of human GLP-1(7-36) amide in a total of 10
mg dry powder formulation containing FDKP in single dose cartridge.
For this study, 20 patients with Type 2 diabetes, including adult
males and postmenopausal females, were fasted overnight and
remained fasted for a period of 4 hr after GLP-1 inhalation powder
administration. The dry powder formulation was administered using
the Medtone.RTM. dry powder inhaler (MannKind Corporation), and
described in U.S. patent application Ser. No. 10/655,153, which
disclosure is incorporated herein by reference in its entirety.
[0147] Blood samples for assessing serum glucose levels from the
treated patients were obtained at 30 min prior to dosing, at dosing
(time 0), and at approximately 2, 4, 9, 15, 30, 45, 60, 90, 120 and
240 min following GLP-1 administration. The serum glucose levels
were analyzed for each sample.
[0148] FIG. 11 is a graph showing the results of these studies and
depicts the glucose values obtained from six fasted patients with
Type 2 diabetes following administration of a single dose of an
inhalable dry powder formulation containing GLP-1 at various time
points. The glucose values for all six patients decreased following
administration of GLP-1 and remained depressed for at least 4 hrs
after administration at the termination of the study.
[0149] FIG. 12 is a graph showing the mean glucose values for the
group of six fasted patients with Type 2 diabetes whose glucose
values are shown in FIG. 11. In FIG. 12, the glucose values are
expressed as the mean change of glucose levels from zero time
(dosing) for all six patients. FIG. 12 shows a mean glucose drop of
approximately 1 mmol/L, which is approximately equivalent to from
about 18 mg/dL to about 20 mg/dL, is attained by the 30 min time
point. This mean drop in glucose levels to last for 120 min. The
changes are larger in subjects with higher baseline glucose and
more prolonged, whereas in 2 of the 6 subjects, those subjects with
the lowest baseline fasted blood glucose, showed only a transient
lowering of glucose levels in this timeframe (data not shown). It
was noted that those with higher fasting glucose do not typically
have the same insulin response as those with lower values, so that
when stimulated, those subjects with higher fasting glucose
typically exhibit a greater response than those whose glucose value
are closer to normal.
Example 5
First Pass Distribution Model of Intact GLP-1 to Brain and
Liver
[0150] First pass distribution of GLP-1 through the systemic
circulation following pulmonary delivery and intravenous bolus
administration was calculated to determine the efficacy of delivery
for both methods of GLP-1 administration. A model was developed
based on the assumptions that: (1) the absorption of GLP-1 from the
lungs and into the pulmonary veins exhibited zero-order kinetics;
(2) the distribution of GLP-1 to the brain and within the brain
occurs instantaneously, and (3) clearance of GLP-1 from the brain
and liver distribution is driven by basal blood flow only. Based on
these assumptions, the analysis to determine the amount of GLP-1 in
the brain and liver was based on published data with respect to
extraction of GLP-1 by certain tissues and organs (Deacon, C. F. et
al. "Glucagon-like peptide 1 undergoes differential tissue-specific
metabolism in the anesthetized pig." American Physiological
Society, 1996, pages E458-E464), and blood flow distribution to the
body and rate due to cardiac output from human studies (Guyton
Textbook of Physiology, 10.sup.th Edition; W. B. Saunders, 2000,
page 176). In a normal subject (70 kg) having normal physiological
parameters such as blood pressure at resting, the basal flow rate
to the brain and liver are 700 mL/min and 1350 mL/min,
respectively. Based on cardiac output, blood flow distribution to
the body has been calculated to be 14% to the brain, 27% to the
liver and 59% to remaining body tissues (Guyton).
[0151] Using the above-mentioned parameters, the relative amounts
of GLP-1 that would be distributed to the brain and liver for a 1
mg dose given by pulmonary and intravenous administration were
determined. One mg of GLP-1 was divided by 60 seconds, and the
resultant number was multiplied by 14% flow distribution to the
brain. Therefore, every second a fraction of the dose is appearing
in the brain. From the data available indicating that blood in the
brain is equal to 150 mL and the clearance rate is 700 mL/min, the
calculations on clearance of GLP-1 yields about 12 mL/second, which
equals approximately 8% of the blood volume being cleared from the
brain per second. In the intravenous studies in pigs reported by
Deacon et al., 40% of GLP-1 was instantaneously metabolized in the
vein and 10% was also metabolized in the deoxygenated blood in the
lung. Accordingly, 40% followed by another 10% of the total GLP-1
was subtracted from the total amount administered in the
calculations with respect to the intravenous data analysis.
[0152] For the GLP-1 amounts estimated in the liver, the same
degradation assumptions were made for the intravenous and pulmonary
administration routes, with 40% followed by another 10% total
amount loss for the IV dose. Twenty-seven percent of the remaining
GLP-1 was assumed to be distributed to the liver, with 75% of the
blood passing through the portal bed first. Instantaneous
distribution of blood in the liver was assumed. Calculations were
as follows: One mg of GLP-1 was divided by 60 seconds, 40% followed
by another 10% of the total GLP-1 was subtracted from the total
amount administered with respect to the intravenous data analysis.
No degradation was assumed for the pulmonary administration. The
resultant numbers were multiplied by 27% flow distribution to the
liver, for both routes of administration, with 75% of this amount
passing though the portal bed first. In the intravenous studies in
pigs reported by Deacon et al., 20% extraction by the portal bed
was reported; hence 75% of the amount of GLP-1 was reduced by 20%
before being introduced into the liver. Therefore, the total amount
of GLP-1 appearing in the liver every second is comprised of a
fraction which has undergone metabolism in the portal bed. From the
data available indicating that blood volume in the liver is equal
to 750 mL and the clearance rate is 1350 mL/minute, the
calculations on clearance of GLP-1 yields about 22.5 mL/second,
which equals approximately 3% of the blood volume being cleared
from the liver per second. Deacon et al. reported 45% degradation
in the liver, accordingly, 45% of the total GLP-1 was subtracted
from the total amount appearing in the liver, and the remainder was
added to the total remaining amount.
[0153] The results of the calculations described above are
presented in Tables 4 and 5. The calculated GLP-1 distribution in
brain and liver after pulmonary administration (Table 4) are shown
below:
TABLE-US-00004 TABLE 4 Pulmonary administration of 1 mg GLP-1 Time
in Seconds Brain (.mu.g) Liver (.mu.g) 1 2.3 2.10 5 9.94 9.91 60
29.0 58.9
[0154] The results illustrating the distribution of GLP-1 after an
intravenous bolus administration are shown in Table 5 below:
TABLE-US-00005 TABLE 5 Intravenous bolus administration of 1 mg
GLP-1 over 1 minute Time in Seconds Brain (.mu.g) Liver (.mu.g) 1
1.26 1.14 5 5.37 5.35 60 15.6 31.7
[0155] The data above are representative illustrations of the
distribution of GLP-1 to specific tissues of the body after
degradation of GLP-1 by endogenous enzymes. Based on the above
determinations, the amounts of GLP-1 in brain and liver after
pulmonary administration are about 1.82 to about 1.86 times higher
than the amounts of GLP-1 after intravenous bolus administration.
Therefore, the data indicate that pulmonary delivery of GLP-1 can
be a more effective route of delivery when compared to intravenous
administration of GLP-1, as the amount of GLP-1 at various times
after administration would be about double the amount obtained with
intravenous administration. Therefore, treatment of a disease or
disorder comprising GLP-1 by pulmonary administration would require
smaller total amounts, or almost half of an intravenous GLP-1 dose
that is required to yield the same or similar effects.
Example 6
[0156] The studies in this example were conducted to measure the
pharmacokinetic parameters of various active agents by subcutaneous
administration and in formulations comprising a FDKP, FDKP disodium
salt, succinyl-substituted-DKP (SDKP, also referred to herein as
Compound 1) or asymmetrical (fumaryl-monosubstituted)-DKP (also
referred herein as Compound 2) to ZDF rats administered by
pulmonary insufflation. The rats were divided into 8 groups and
five rats were assigned to each group. Each rat in Group 1 received
a 0.3 mg dose of exendin-4 in phosphate buffered saline solution by
pulmonary liquid instillation; Group 2 received 0.3 mg of exendin-4
in phosphate buffered saline by subcutaneous injection.
[0157] Rats in Groups 3-8 received their dosing of active agent or
exendin-4 by pulmonary insufflation as follows: Group 3 rats
received a 2 mg formulation of GLP-1/FDKP by pulmonary
insufflation, followed by a 2 mg dose of exendin-4; Group 4
received a formulation of exendin-4/FDKP; Group 5 rats received a 3
mg dose of exendin-4 formulated as a 9.2% load in a disodium salt
of FDKP; Group 6 rats received a 2 mg dose of exendin-4 formulated
as a 13.4% load in a disodium salt of FDKP; Group 7 rats received a
2 mg dose of exendin-4 formulated as a 14.5% load in SDKP, and
Group 8 rats received a 2 mg dose of exendin-4 formulated as a
13.1% load in asymmetrical (fumaryl-mono-substituted) DKP.
[0158] The dosing of the animals occurred over the course of two
days to accommodate the high numbers of subjects. The various test
articles were administered to the animals and blood samples were
taken at various times after dosing. Exendin-4 concentrations were
measured in plasma isolates; the results for which are provided in
FIG. 13. As depicted in the graph, Group 4 treated rats which
received exendin-4 in a formulation containing FDKP exhibited high
levels of exendin-4 in the blood earlier than 30 min and at higher
levels than the rats in Group 2, which received exendin-4 by
subcutaneous administration. In all groups, the levels of exendin-4
decrease sharply at about an hour after administration.
[0159] Administration of exendin-4/FDKP by pulmonary insufflation
in ZDF rats has similar dose-normalized C.sub.max, AUC, and
bioavailability as exendin-4 administered as a subcutaneous
injection. Exendin-4/FDKP administered by pulmonary insufflation
showed a greater than two-fold half life compared to exendin-4 by
subcutaneous injection. Exendin-4 administered as an
fumaryl(mono-substituted)DKP, or SDKP formulation showed lower dose
normalized C.sub.max, AUC, and bioavailability compared to
subcutaneous injection (approximately 50% less) but higher levels
than pulmonary instillation.
[0160] After an overnight fast, ZDF rats were given a glucose
challenge by intraperitoneal injection (IPGTT). Treatment with
exendin-4/FDKP showed a greater reduction in blood glucose levels
following the IPGTT compared to exendin-4 by the subcutaneous
route. Compared to air control animals, blood glucose levels were
significantly lowered following an IPGTT for 30 and 60 min in
animals administered exendin-4 by subcutaneous injection and
exendin-4/FDKP powder by pulmonary administration, respectively.
Group 3 ZDF rats treated with exendin-4/FDKP and GLP-1 by pulmonary
insufflation after treatment with intraperitoneal glucose
administration (IPGTT) showed surprisingly lower blood glucose
levels following IPGTT compared to either treatment alone at 30 min
post dose (-28% versus -24%).
Example 7
[0161] The studies in this example were conducted to measure the
pharmacokinetic and pharmacodynamic profile of peptide YY(3-36)
formulations by pulmonary administration to ZDF rats compared to
intravenous injections.
[0162] Preparation of PYY/FDKP Formulation for Pulmonary
Delivery:
[0163] Peptide YY(3-36) (PYY) used in these experiments was
obtained from American Peptide and was adsorbed onto FDKP particles
as a function of pH. A 10% peptide stock solution was prepared by
weighing 85.15 mg of PYY into an 8 ml clear vial and adding 2%
aqueous acetic acid to a final weight of 762 mg. The peptide was
gently mixed to obtain a clear solution. FDKP suspension (4968 mg,
containing 424 mg of FDKP preformed particles) was added to the
vial containing the PYY solution, which formed a PYY/FDKP particle
suspension. The sample was placed on a magnetic stir-plate and
mixed thoroughly throughout the experiment. A micro pH electrode
was used to monitor the pH of the mixture. Aliquots of 2-3 .mu.L of
a 14-15% aqueous ammonia solution were used to incrementally
increase the pH of the sample. Sample volumes (75 .mu.L for
analysis of the supernatant; 10 .mu.L for suspension) were removed
at each pH point. The samples for supernatant analysis were
transferred to 1.5 ml, 0.22 .mu.m filter tubes and centrifuged. The
suspension and filtered supernatant samples were transferred into
HPLC autosampler vials containing 990 .mu.L of 50 mM sodium
bicarbonate solution. The diluted samples were analyzed by HPLC to
assess the characteristics of the preparations. The experiments
indicated that, for example, a 10.2% of PYY solution can be
adsorbed onto FDKP particles at pH 4.5 In this particular
preparation, for example, the PYY content of the resultant powder
was determined by HPLC to be 14.5% (w/w). Cascade measurements of
aerodynamic characteristics of the powder showed a respirable
fraction of 52% with a 98% cartridge emptying when discharged
through the MedTone.RTM. dry powder inhaler (MannKind Corporation).
Based on the results above, multiple sample preparations of
PYY/FDKP powder were made, including, 5%, 10%, 15% and 20% PYY.
[0164] Pharmacokinetic and Pharmacodynamic Studies:
[0165] Female ZDF rats were used in these experiments and divided
into 7 groups; five rats were assigned to each group, except for
Group 1 which had 3 rats. The rats were fasted for 24 hr prior to
being given their assigned dose and immediately provided with food
after dosing and allowed to eat as desired for the period of the
experiment. Each rat in Group 1 received a 0.6 mg IV dose of PYY in
phosphate buffered saline solution; Group 2 rats received 1.0 mg of
PYY pulmonary liquid instillation; Group 3 rats were designated as
control and received a stream of air; Groups 4-7 rats received a
dry powder formulation for inhalation administered by pulmonary
insufflation as follows: Group 4 rats received 0.15 mg of PYY in a
3 mg PYY/FDKP powder formulation of 5% PYY (w/w) load; Group 5 rats
received 0.3 mg of PYY in a 3 mg PYY/FDKP powder formulation of 10%
PYY (w/w) load; Group 6 rats received 0.45 mg of PYY in a 3 mg
PYY/FDKP powder formulation of 15% PYY (w/w) load; Group 7 rats
received 0.6 mg of PYY in a 3 mg PYY/FDKP powder formulation of 20%
PYY (w/w) load.
[0166] Food consumption was measured for each rat at 30, 60, 90,
120, 240 min and 24 hr after dosing. PYY plasma concentrations and
glucose concentrations were determined for each rat from blood
samples taken from the rats before dosing and at 5, 10, 20, 30, 45,
60 and 90 min after dosing. The results of these experiments are
shown in FIGS. 14-16 and Table 6 below. FIG. 14 is a bar graph of
representative data from experiments measuring food consumption in
female ZDF rats receiving PYY formulations by intravenous
administration and by pulmonary administration in a formulation
comprising a fumaryl-diketopiperazine at the various doses. The
data show that food consumption was reduced for all PYY-treated
rats when compared to control with the exception of Group 2 which
received PYY by instillation. Reduction in food consumption by the
rats was statistically significant for the rats treated by
pulmonary insufflation at 30, 60, 90 and 120 min after PYY-dosing
when compared to control. The data in FIG. 14 also show that while
IV administration (Group 1) is relatively effective in reducing
food consumption in the rats, the same amount of PYY (0.6 mg)
administered by the pulmonary route in an FDKP formulation (Group
7) was more effective in reducing the amount of food intake or
suppressing appetite for a longer period of time. All PYY-treated
rats receiving pulmonary PYY-FDKP powders consumed less food when
compared to controls.
[0167] FIG. 15 depicts the measured blood glucose levels in the
female ZDF rats given PYY formulations by IV administration; by
pulmonary administration with various formulations comprising a
fumaryl-diketopiperazine and air control rats. The data indicate
the blood glucose levels of the PYY-treated rats by pulmonary
insufflation remained relatively similar to the controls, except
for the Group 1 rats which were treated with PYY IV. The Group 1
rats showed an initial lower blood glucose level when compared to
the other rats up to about 15 min after dosing.
[0168] FIG. 16 depicts representative data from experiments
measuring the plasma concentration of PYY in the female ZDF rats
given PYY formulations by IV administration; by pulmonary
administration with various formulations comprising a
fumaryl-diketopiperazine, and air control rats taken at various
times after administration. These measurements are also represented
in Table 6. The data show that Group 1 rats which were administered
PYY IV attained a higher plasma PYY concentration (30.7 .mu.g/mL)
than rats treated by pulmonary insufflation. Peak plasma
concentration (T.sub.max) for PYY was about 5 min for Groups 1, 6
and 7 rats and 10 min for Group 2, 4 and 5 rats. The data show that
all rats treated by pulmonary insufflation with a PYY/FDKP
formulation had measurable amounts of PYY in their plasma samples,
however, the Group 7 rats had the highest plasma PYY concentration
(4.9 .mu.g/mL) and values remained higher than the other groups up
to about 35 min after dosing. The data also indicate that the
plasma concentration of PYY administered by pulmonary insufflation
is dose dependent. While administration by IV injection led to
higher venous plasma concentration of PYY that did pulmonary
administration of PYY/FDKP at the dosages used, the greater
suppression of food consumption was nonetheless achieved with
pulmonary administration of PYY/FDKP.
TABLE-US-00006 TABLE 6 Rat Group T1/2 Tmax Cmax AUCall/D BA Number
(min) (min) (.mu.g/mL) (min/mL) (%) 1 13 5 30.7 0.61 100% 2 22 10
1.7 0.06 11 4 23 10 0.51 0.10 16 5 30 10 1.33 0.15 25 6 26 5 2.79
0.20 33 7 22 5 4.90 0.22 36
[0169] FIG. 17 illustrates the effectiveness of the present drug
delivery system as measured for several active agents, including
insulin, exendin, oxyntomodulin and PYY and exemplified herewith.
Specifically, FIG. 17 demonstrates the relationship between drug
exposure and bioeffect of the pulmonary drug delivery system
compared to IV and SC administration of the aforementioned active
agents. The data in FIG. 17 indicate that the present pulmonary
drug delivery system provides a greater bioeffect with lesser
amounts of drug exposure than intravenous or subcutaneous
administration. Therefore, lesser amounts of drug exposure can be
required to obtain a similar or greater effect of a desired drug
when compared to standard therapies. Thus, in one embodiment, a
method of delivering of an active agent, including, peptides such
as GLP-1, oxyntomodulin, PYY, for the treatment of disease,
including diabetes, hyperglycemia and obesity which comprises
administering to a subject in need of treatment an inhalable
formulation comprising one or more active agents and a
diketopiperazine whereby a therapeutic effect is seen with lower
exposure to the active agent than required to achieve a similar
effect with other modes of administration. In one embodiment, the
active agents include peptides, proteins, lipokines.
Example 8
Assessment of GLP-1 Activity in Postprandial Type 2 Diabetes
Mellitus
[0170] The purpose of this study was to evaluate the effect of a
GLP-1 dry powder formulation on postprandial glucose concentration
and assess its safety including adverse events, GPL-1 activity,
insulin response, and gastric emptying.
[0171] Experimental Design: The study was divided into two periods
and enrolled 20 patients diagnosed with type 2 diabetes ranging in
age from 20 to 64 years of age. Period 1 was an open-label,
single-dose, trial in which 15 of the patients received a dry
powder formulation comprising 1.5 mg of GLP-1 in FDKP administered
after having fasted overnight. As control, 5 subjects received FDKP
inhalation powder after fasting overnight. Period 2 was performed
after completion of Period 1. In this part of the study, the
patients were given 4 sequential treatments each with a meal
challenge consisting of 475 Kcal and labeled with
.sup.13C-octanoate as marker. The study was designed as a
double-blind, double dummy, cross-over, meal challenge study, in
which saline as control and exenatide were given as injection 15
minutes before a meal and dry powder formulations of inhalable
GLP-1 or placebo consisting of a dry powder formulation without
GLP-1, were administered immediately before the meal and repeated
30 minutes after the meal. The four treatments were as follows:
Treatment 1 consisted of all patients receiving a placebo of 1.5 mg
of dry powder formulation without GLP-1. In Treatment 2, all
patients received one dose of 1.5 mg of GLP-1 in a dry powder
formulation comprising FDKP. In Treatment 3, all patients received
two doses of 1.5 mg of GLP-1 in a dry powder formulation comprising
FDKP, one dose immediately before the meal and one dose 30 minutes
after the meal. In Treatment 4, the patients received 10 .mu.g of
exenatide by subcutaneous injection. Blood samples from each
patient were taken at various times before and after dosing and
analyzed for several parameters, including GLP-1 concentration,
insulin response, glucose concentration and gastric emptying. The
results of this study are depicted in FIGS. 18-20.
[0172] FIG. 18 depicts the mean GLP-1 levels in blood by treatment
group as described above. The data demonstrate that the patients
receiving the dry powder formulation comprising 1.5 mg of GLP-1 in
FDKP had significantly higher levels of GLP-1 in blood soon after
administration as shown in panels A, B and C and that the levels of
GLP-1 sharply declined after administration in fed or fasted
individuals. There were no measurable levels of GLP-1 in the
exenatide-treated group (Panel D), or in controls (Panel E)
receiving the dry powder formulation.
[0173] FIG. 19 depicts the insulin levels of the patients in the
study before or after treatment. The data show that endogenous
insulin was produced in all patients after treatment including the
placebo-treated patients in the meal challenge studies (Panel B),
except for the fasted control patients (Panel C) who received the
placebo. However, the insulin response was more significant in
patients receiving GLP-1 in a dry powder composition comprising
FDKP, in which the insulin response was observed immediately after
treatment in both fed and fasted groups (Panels D-F). The results
also showed that the glucose levels were reduced in patients
treated with the dry powder formulation of GLP-1. Administration of
the dry powder formulation of GLP-1 resulted in a delayed rise in
blood glucose and reduced overall exposure (AUC) to glucose. Both
the delayed rise and lessened exposure were more pronounced in
subjects receiving a second administration of GLP-1 inhalation
powder (data not shown). The magnitude of insulin release varied
among patients, with some showing small but physiologically
relevant levels of insulin whereas others exhibited much larger
insulin releases. Despite the difference in insulin response
between the patients, the glucose response was similar. This
difference in insulin response may reflect variations in degree of
insulin resistance and disease progression. Assessment of this
response can be used as a diagnostic indicator of disease
progression with larger releases (lacking greater effectiveness at
controlling blood glucose levels) indicating greater insulin
resistance and disease progression.
[0174] FIG. 20 depicts the percent gastric emptying by treatment
groups. Panel A (patients in Treatment 3) and Panel B (patients in
Treatment 2) patients had similar gastric emptying characteristics
or percentages as the control patients shown in Panel D (Placebo
treated patients with a dry powder formulation comprising FDKP
without GLP-1). The data also show that patients treated with
exenatide even at a 10 .mu.g dose exhibited a significant delay or
inhibition in gastric emptying when compared to controls. The data
also demonstrate that the present system for delivering active
agents comprising FDKP and GLP-1 lacks inhibition of gastric
emptying; induces a rapid insulin release following GLP-1 delivery
and causes a reduction in glucose AUC levels.
[0175] While the invention has been particularly shown and
described with reference to particular embodiments, it will be
appreciated that variations of the above-disclosed and other
features and functions, or alternatives thereof, may be desirably
combined into many other different systems or applications. Also
that various presently unforeseen or unanticipated alternatives,
modifications, variations or improvements therein may be
subsequently made by those skilled in the art which are also
intended to be encompassed by the following claims.
[0176] Unless otherwise indicated, all numbers expressing
quantities of ingredients, properties such as molecular weight,
reaction conditions, and so forth used in the specification and
claims are to be understood as being modified in all instances by
the term "about." Accordingly, unless indicated to the contrary,
the numerical parameters set forth in the specification and
attached claims are approximations that may vary depending upon the
desired properties sought to be obtained by the present invention.
At the very least, and not as an attempt to limit the application
of the doctrine of equivalents to the scope of the claims, each
numerical parameter should at least be construed in light of the
number of reported significant digits and by applying ordinary
rounding techniques. Notwithstanding that the numerical ranges and
parameters setting forth the broad scope of the invention are
approximations, the numerical values set forth in the specific
examples are reported as precisely as possible. Any numerical
value, however, inherently contains certain errors necessarily
resulting from the standard deviation found in their respective
testing measurements.
[0177] The terms "a," "an," "the" and similar referents used in the
context of describing the invention (especially in the context of
the following claims) are to be construed to cover both the
singular and the plural, unless otherwise indicated herein or
clearly contradicted by context. Recitation of ranges of values
herein is merely intended to serve as a shorthand method of
referring individually to each separate value falling within the
range. Unless otherwise indicated herein, each individual value is
incorporated into the specification as if it were individually
recited herein. All methods described herein can be performed in
any suitable order unless otherwise indicated herein or otherwise
clearly contradicted by context. The use of any and all examples,
or exemplary language (e.g., "such as") provided herein is intended
merely to better illuminate the invention and does not pose a
limitation on the scope of the invention otherwise claimed. No
language in the specification should be construed as indicating any
non-claimed element essential to the practice of the invention.
[0178] Groupings of alternative elements or embodiments of the
invention disclosed herein are not to be construed as limitations.
Each group member may be referred to and claimed individually or in
any combination with other members of the group or other elements
found herein. It is anticipated that one or more members of a group
may be included in, or deleted from, a group for reasons of
convenience and/or patentability. When any such inclusion or
deletion occurs, the specification is deemed to contain the group
as modified thus fulfilling the written description of all Markush
groups used in the appended claims.
[0179] Certain embodiments of this invention are described herein,
including the best mode known to the inventors for carrying out the
invention. Of course, variations on these described embodiments
will become apparent to those of ordinary skill in the art upon
reading the foregoing description. The inventor expects skilled
artisans to employ such variations as appropriate, and the
inventors intend for the invention to be practiced otherwise than
specifically described herein. Accordingly, this invention includes
all modifications and equivalents of the subject matter recited in
the claims appended hereto as permitted by applicable law.
Moreover, any combination of the above-described elements in all
possible variations thereof is encompassed by the invention unless
otherwise indicated herein or otherwise clearly contradicted by
context.
[0180] Furthermore, numerous references have been made to patents
and printed publications throughout this specification. Each of the
above-cited references and printed publications are individually
incorporated herein by reference in their entirety.
[0181] In closing, it is to be understood that the embodiments of
the invention disclosed herein are illustrative of the principles
of the present invention. Other modifications that may be employed
are within the scope of the invention. Thus, by way of example, but
not of limitation, alternative configurations of the present
invention may be utilized in accordance with the teachings herein.
Accordingly, the present invention is not limited to that precisely
as shown and described.
* * * * *