U.S. patent application number 12/041440 was filed with the patent office on 2008-09-11 for therapeutic uses for aminosterol compounds.
Invention is credited to Mark Anderson, William Kinney, Michael McLane, Jon Williams, Michael Zasloff.
Application Number | 20080221075 12/041440 |
Document ID | / |
Family ID | 25386479 |
Filed Date | 2008-09-11 |
United States Patent
Application |
20080221075 |
Kind Code |
A1 |
Zasloff; Michael ; et
al. |
September 11, 2008 |
Therapeutic Uses For Aminosterol Compounds
Abstract
A pharmaceutical composition includes, as an active ingredient,
a compound according to formula 1436 as shown in FIG. 1, or a
pharmaceutically acceptable salt thereof, and a pharmaceutically
acceptable carrier or excipient. Various pharmaceutical products
may be produced including this pharmaceutical composition. Such
pharmaceutical products may be used for the treatment of obesity or
diabetes. Methods for using the pharmaceutical compositions also
are described. In these methods, various diseases are treated or
other body functions are activated or inhibited by administering an
effective amount of the pharmaceutical composition. For example,
diabetes and obesity may be treated by administering an effective
amount of the pharmaceutical compositions. Weight gain, and growth
factor production can be inhibited by administering an effective
amount of these pharmaceutical compositions. Appetite can be
suppressed by administering an effective amount of the
pharmaceutical compositions, and a diuretic effect can be
produced.
Inventors: |
Zasloff; Michael; (Plymouth
Meeting, PA) ; Williams; Jon; (Plymouth Meeting,
PA) ; Kinney; William; (Plymouth Meeting, PA)
; Anderson; Mark; (Plymouth Meeting, PA) ; McLane;
Michael; (Plymouth Meeting, PA) |
Correspondence
Address: |
MORGAN LEWIS & BOCKIUS LLP
1111 PENNSYLVANIA AVENUE NW
WASHINGTON
DC
20004
US
|
Family ID: |
25386479 |
Appl. No.: |
12/041440 |
Filed: |
March 3, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09885247 |
Jul 13, 2000 |
|
|
|
12041440 |
|
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Current U.S.
Class: |
514/182 ;
552/521 |
Current CPC
Class: |
A61K 31/575 20130101;
A61P 9/10 20180101; A61P 3/04 20180101; C07J 41/0055 20130101; A61P
3/06 20180101 |
Class at
Publication: |
514/182 ;
552/521 |
International
Class: |
A61K 31/56 20060101
A61K031/56; C07J 41/00 20060101 C07J041/00; A61P 3/04 20060101
A61P003/04 |
Claims
1-13. (canceled)
14: The compound ##STR00002## or a pharmaceutically acceptable salt
thereof.
15: A pharmaceutical composition comprising the compound of claim
14 or a pharmaceutically acceptable salt thereof and a
pharmaceutically acceptable carrier or excipient.
16: A method for treating obesity in a mammal, comprising
administering to a mammal in need thereof an amount of the
pharmaceutical composition according to claim 15 effective to treat
the obesity.
17: A method for inhibiting weight gain in a mammal, comprising
administering to a mammal in need thereof an amount of the
pharmaceutical composition according to claim 15 effective to
inhibit the weight gain.
18: The method according to claim 16, wherein the composition is
administered in an amount from about 0.01 mg/kg of body weight/day
to about 100 mg/kg of body weight/day.
19: The method according to claim 17, wherein the composition is
administered in an amount from about 0.01 mg/kg of body weight/day
to about 100 mg/kg of body weight/day.
20: The method according to claim 16, wherein the composition is
administered in an amount from about 0.1 mg/kg of body weight/day
to about 25 mg/kg of body weight/day.
21: The method according to claim 17, wherein the composition is
administered in an amount from about 0.1 mg/kg of body weight/day
to about 25 mg/kg of body weight/day.
22: The method according to claim 16, wherein the composition is
administered orally.
23: The method according to claim 17, wherein the composition is
administered orally.
24: The method according to claim 16, wherein the mammal is a
human.
25: The method according to claim 17, wherein the mammal is a
human.
26: The method according to claim 25, wherein the human is
obese.
27: The method according to claim 25, wherein the human is
overweight.
28: The method according to claim 25, wherein the human is of
normal weight.
29: The method of claim 16 or claim 17, wherein administration of
the composition is associated with inhibition of growth factor
production in the mammal.
Description
RELATED APPLICATION DATA
[0001] This application is related to U.S. patent application Ser.
No. 08/857,288 filed May 16, 1997 which claims priority benefits
under 35 U.S.C. .sctn.119 based on U.S. Provisional Patent Appl.
Nos. 60/017,627, filed May 17, 1996 and 60/029,541, filed Nov. 1,
1996, which applications each are entirely incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] I. Information Relating to Previous Patents and
Applications
[0003] Several aminosterol compositions have been isolated from the
liver and stomach of the dogfish shark, Squalus acanthias. One
important aminosterol, squalamine, is the subject of U.S. Pat. No.
5,192,756 to Zasloff, et al., which patent is entirely incorporated
herein by reference. That patent describes the antibiotic
properties of squalamine. Since the discovery of squalamine,
several interesting properties of this compound have been
discovered. For example, as described in U.S. Pat. Nos. 5,733,899
and 5,721,226, squalamine may function as an antiangiogenic agent.
These patents are entirely incorporated herein by reference.
Additional uses of squalamine (e.g., as an NHE3 inhibiting agent
and as an agent for inhibiting the growth of endothelial cells) are
disclosed in U.S. Pat. No. 5,792,635 and U.S. patent application
Ser. No. 08/840,706 (filed Apr. 25, 1998, entitled "Treatment of
Carcinomas Using Squalamine in Combination with Other Anti-cancer
Agents," in the names of Michael Zasloff and Jon Williams) and
continuation of this application Ser. No. 09/150,724 filed Sep. 10,
1998 and PCT Application US99/20645. These applications also are
entirely incorporated herein by reference.
[0004] Methods for synthesizing squalamine have been devised, such
as the methods described in WO 98/24800 (published Jun. 10, 1998)
and in U.S. Patent Appl. No. 60/032,378. This PCT publication and
the U.S. patent application are entirely incorporated herein by
reference. The PCT application relates to U.S. patent application
Ser. No. 08/985,876, which application also is entirely
incorporated herein by reference. Additionally, U.S. Pat. No.
5,792,635 also discloses squalamine isolation and synthesis
techniques.
[0005] Stemming from the discovery of squalamine, other
aminosterols have been discovered in the dogfish shark liver and
stomach and have been investigated. One important aminosterol that
has been isolated and identified has the structure shown in FIG. 1.
In this application, the compound having the structure shown in
FIG. 1 will be referred to as "compound 1436" or simply "1436."
This compound has the general molecular formula
C.sub.37H.sub.72N.sub.4O.sub.5S and a calculated molecular weight
of 684.53017.
[0006] Compound 1436 previously has been described in U.S. Pat.
Nos. 5,795,885, 5,763,430, and 5,847,172. Each of these U.S.
patents is entirely incorporated herein by reference. These U.S.
patents describe the structure of compound 1436 and other
aminosterols, as well as processes for synthesizing and isolating
compound 1436 and related aminosterols. For example, compound 1436
may be prepared from squalamine as starting material. Additional
methods for synthesizing compound 1436 (as well as squalamine) are
described in U.S. Provisional Patent Appl. No. 60/032,378, filed
Dec. 6, 1996, which application is entirely incorporated herein by
reference.
[0007] As further described in these patents and patent
applications, compound 1436 has a variety of interesting
properties. For example, compound 1436 has been found to be capable
of inhibiting mitogen-induced mouse, dog or human T-lymphocyte
proliferation, as well as being capable of inhibiting the
proliferation of a variety of other cells and tissues.
[0008] II. Information Relating to this Application
[0009] Compound 1436 and other aminosterol compounds isolated from
the dogfish shark liver and stomach have been found to possess
interesting antibiotic and anti-proliferative properties with
respect to a variety of cells and tissues. These interesting
properties of compound 1436 have prompted applicants to conduct
further investigation into the uses and properties of this
compound.
[0010] In addition to treating various ailments and diseases, such
as viral based ailments and diseases, cancers, and arthritis,
compound 1436 has been found to have other favorable properties and
effects. As one specific example, applicants have found that
compound 1436 may be used to reduce weight gain in mammals and in a
mouse model of type II diabetes to prevent weight gain and to
maintain blood glucose at normal levels. The weight gain of the
animals in these studies was controlled due to reduction of net
food consumption and they were apparently healthy, viable
animals.
SUMMARY OF THE INVENTION
[0011] This invention relates to a pharmaceutical composition,
including a compound according to formula 1436 as shown in FIG. 1,
or a pharmaceutically acceptable salt thereof (as an active
ingredient), and a pharmaceutically acceptable carrier or
excipient. The invention further relates to pharmaceutical products
including the pharmaceutical composition described above. Such
pharmaceutical products may be provided for the treatment of
obesity and diabetes.
[0012] In another aspect of this invention it was determined that
extended treatment of mice with the compound 1436 not only produced
a inhibition of weight gain but also caused a reduction of serum
cholesterol levels. Therefore one use for compound 1436 is for the
reduction of serum cholesterol and the treatment of
atherosclerosis.
[0013] In a further embodiment of the invention it was determined
that analogues of the compound 1436 were also active in the
prevention of weight gain in mice and it was found that the
compounds were covered by the following generic formula:
##STR00001##
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] These and other advantageous aspects of the invention will
be evident from the following detailed description, which should be
considered in conjunction with the attached drawings, wherein:
[0015] FIG. 1 illustrates the molecular structure of aminosterol
1436;
[0016] FIG. 2 shows the effect of 1436 on mouse body weight in one
study;
[0017] FIG. 3 shows the effect of 1436 on the body weight of mice
in a dose response study;
[0018] FIG. 4 shows the effect of oral dosing of 1436 on the body
weight of mice;
[0019] FIG. 5 shows the effect of 1436 on the body weight of obese
mice (OB/OB);
[0020] FIG. 6 shows the effect of 1436 on the body weight of
diabetic mice (db/db);
[0021] FIG. 7 shows that 1436 inhibits the action of growth hormone
releasing factor (GHRF);
[0022] FIG. 8 shows the effect of 1436 on body weight in DBA/2J
mice;
[0023] FIG. 9 shows the effect of 1436 on food consumption in
DBA/2J mice;
[0024] FIG. 10 shows the effect of 1436 on urine output in DBA/2J
mice;
[0025] FIG. 11 shows the effect of 1436 on water consumption in
DBA/2J mice; and
[0026] FIG. 12 shows the effect of 1436 on plasma levels of
electrolytes and osmolality.
[0027] FIG. 13 shows structures of MSI-1436 analogues compared to
MSI-1436.
[0028] FIG. 14 shows the effect of analogues of MSI-1436 on weight
gain in mice.
[0029] FIG. 15 shows the effect of long term dosing of
MSI-1436.
DETAILED DESCRIPTION OF THE INVENTION
[0030] As described above, compound 1436 has been discovered in and
isolated from the liver and stomach of the dogfish shark. Compound
1436 has been shown to have an effect on weight gain, and
specifically in the control of weight gain in the diabetic mouse
(db/db). In addition it has been shown to control blood glucose and
cholesterol in this mouse and therefore should be useful for the
treatment of diabetes and athrosclorsis.
[0031] To determine the long-term effects of MSI-1436 on the
metabolic status of genetically obese mice, ob/ob animals were
treated once weekly for 4 months (FIG. 15). MSI-1436 produces a
dose dependent reduction in weight gain. Animals receiving 10 or 20
mg/kg/wk lose excessive weight and grow emaciated and moribund
within several weeks (FIG. 15). However, safely managed weight
control (i.e., no deaths) was possible over a four-month period
using an intermittent dosing regimen (FIG. 15 A, 3.1 mg kg/week
cohort). When weight fell to about 10% above starting weight,
MSI-1436 dosing was stopped, permitting a continued but limited
decline in weight; as feeding increased, and weight recovered,
dosing resumed. Ob/ob mice eventually develop diabetes, possibly
because of fat accumulation within pancreatic islet cells (Chen G,
Koyama K, Yuan X, Lee Y, Zhou Y-T, O'Doherty R, Newgard C B, Unger
R H. Disappearance of body fat in normal rats induced by
adenovirus-mediated leptin gene therapy. Proc. Natl. Acad. Sci. USA
1996; 93: 14795-14799 and Shimabukuro M, Koyama K, Chen G, Wang
M-Y, Trieu F, Lee Y, Newgard C B, Unger R H. Direct antidiabetic
effect of leptin through triglyceride depletion of tissues. Proc.
Natl. Acad. Sci. USA 1997; 94: 4637-4641). Animals were evaluated
about 40 days after treatment ceased (day 63). Mice receiving 3.1
mg/kg/week were within 10% above their starting weight, while
untreated controls had gained 70%. An oral glucose tolerance test
revealed a normal metabolic response in the MSI-1436 treated group,
in contrast to the diabetic pattern in the vehicle-treated cohort
(FIG. 15 B). At 120 days, after dosing had resumed, serum
cholesterol was normalized in animals with controlled weight gain
(1.0 and 3.1 mg/kg/week) regardless of their absolute weight (FIG.
15 C)
[0032] This invention further relates to various methods for using
the pharmaceutical compositions in accordance with the invention.
In the methods according to the invention, various diseases or
symptoms of diseases or ailments are treated by administering an
effective amount of the above-described pharmaceutical composition.
"Treat," "treated," or "treating," as used in this application may
mean complete elimination of the disease, ailment, or symptoms, or
it may mean reducing, suppressing, or ameliorating the severity of
the disease, ailment, or symptoms. As examples, certain body
functions may be inhibited or enhanced by administering an
effective amount of the above-described pharmaceutical
compositions. In this manner, weight gain and growth factor
production can be inhibited, or a diuretic effect can be produced
by administering an effective amount of the pharmaceutical
compositions in accordance with the invention. In a further
embodiment of the invention compound 1436 can be used to treat type
II diabetes where it can be used to prevent excessive weight gain
and to control blood glucose levels.
[0033] This invention will be described below in terms of various
specific examples and preferred embodiments. These examples and
embodiments should be considered to be illustrative of the
invention, and not as limiting the same.
EXAMPLE 1
Body Weight Effect of Compound 1436
[0034] Tests were conducted on compound 1436 to determine the
effect of its administration on the body weight of mammals.
[0035] An animal model for testing the effectiveness of a compound
against arthritis is the bovine type II Collagen Induced Arthritis
Model in mice. Six to eight week old mice (male DBA/1LacJ from
Jackson Labs) were separated into groups of 10. On Day 0, these
mice were immunized subcutaneously with 100 .mu.g of bovine
articular cartilage-derived type II collagen in an adjuvant system
(RIBI Immunochem.). A booster injection of collagen in RIBI
adjuvant was given on Day 21. Compound 1436 was dissolved in
sterile, endotoxin-screened dH.sub.2O and administered
subcutaneously at 200 .mu.g/mouse (10 mg/kg). Dosing with 1436 was
continued every fourth day (10 mg kg) for the duration of the
study. An additional group of immunized mice (including 5 mice) was
treated in this manner for the purpose of observing the
weight-modulating effect of compound 1436. This additional group of
1436 treated mice, did not receive a collagen-booster at Day 21.
Like the other group of 1436 treated mice, these mice received
their first 1436 dose on Day 17. The mice were weighed
approximately weekly on the days indicated in FIG. 2.
[0036] Between Day 25 and Day 32, mice in the mouse serum
albumin/PBS control group lost about 15% of their body weight,
coinciding with the onset and progression of arthritis. See FIG. 2.
A similar weight loss was observed in the 1436 treated mice,
irrespective of whether the mice received the collagen booster
injection at Day 21, and despite the fact that the 1436 treated
mice were relatively disease free. While the body weight of the
mouse serum albumen/PBS mice remained relatively constant after Day
32, the body weights of the 1436 treated mice (with and without the
collagen booster) continued to decline through Day 39. Thus, this
study indicates that 1436 may be useful to regulate weight gain.
The Dex treated mice showed a stable weight pattern over the entire
course of the study period.
[0037] In the Collagen Induced Arthritis Model described above, two
of the five mice in the additional 1436 control group developed
mild arthritis (clinical score of 2) despite having received no
collagen booster immunization at Day 21. It was noted, however,
that these mice received the priming collagen immunization at Day
0. This priming collagen injection is sufficient to induce
arthritis in some animals.
[0038] Additional testing was performed to demonstrate the effect
of compound 1436 on the body weight of mice. The dosage effect of
compound 1436 was tested in one experiment. As illustrated in FIG.
3, compound 1436 was administered subcutaneously into BDF1 male
mice in dosages of 1, 5 and 10 mg 1436/kg body weight every third
day ("QTD") from Day 1 to Day 22. The control vehicle and the 1436
administration vehicle in this experiment was 5% Dex in water. At 5
and 10 mg/kg 1436, weight gain was suppressed in these groups, and
in fact, significant weight loss was experienced. Note the
surprising decrease in the body weight of the mice treated with
these doses of compound 1436. While these 1436 treated animals
experienced a significant weight loss, however, they did not slow
down and become lethargic. Rather, they were normally active and
apparently healthy. 1 mg/kg 1436 did not appear to have a
significant effect on the body weight of the mice in that group.
Notably, after the 1436 treatment was stopped (at Day 22), weight
gain returned in the animals treated with the 5 and 10 mg 1436/kg
body weight doses. Eventually, after 1436 treatment was
discontinued, the body weight of the animals in these groups
reached the level of the animals in the other groups.
[0039] For oral dosing of compound 1436, as shown in FIG. 4, about
60 mg/kg active agent induced a weight suppression effect, which
was most obvious on day 10 of the study. In this experiment, the
CD-1 male mice were dosed orally with 60 mg/kg active once every
third day (QTD) on days 0, 3 and 6, with a dosage volume of 0.01
ml/g. Note that 100 mg/kg 1436 is approximately equivalent to 60
mg/kg active. Again, after 1436 treatment was stopped, the body
weight of the 1436 treated animals returned to the level of the
animals in the control group.
[0040] In another experiment, genetically obese mice (OB/OB) and
diabetic (db/db) mice were treated with compound 1436 to determine
the effect on their body weight. Both homozygous (n=5) and
heterozygous (n=5) control mice for both OB/OB and db/db mice were
treated with sterile H.sub.2O (vehicle). The test results are
illustrated in FIGS. 5 and 6. Weight loss and weight control were
achieved for the 1436 treated mice. FIGS. 5 and 6 show the effects
of compound 1436 (administered s.c. at a dose of 10 mg/kg on days
0, 3 and 6 and 60) on weight in OB/OB and db/db mice, respectively.
In FIGS. 5 and 6, "OB/OB" and "db/db" relate to the leptin/leptin
receptor.
[0041] The body weight suppression effect of compound 1436 may be
the result of suppression of growth factor production and/or growth
factor release in the treated animals. To test this possibility,
the effect of compound 1436 on release of growth hormone during a
GHRF stimulatory test was studied. Compound 1436 or saline
(vehicle) was administered at 10 mg/kg i.v. to rats 30 minutes
prior to a growth hormone releasing factor (GHRF) challenge (2.5
.mu.g GHRF/kg, i.v. at t=0), and the plasma growth hormone output
was measured. Blood samples were taken at t=0, 5, 10 and 15
minutes. As illustrated in FIG. 7, compound 1436 was found to
inhibit growth hormone secretion in rats during a GHRF provocation
test. In this test, the GHRF is added in this system to induce an
increase in growth hormone release.
[0042] To determine the roles of food and water consumption as well
as urine output of compound 1436 on body weight suppression, 20
DBA/2J mice were randomly assigned to one of four groups (5
mice/group) that received either vehicle or compound 1436 at 1,
2.5, or 5 mg active/kg (i.p. every third day ("q 3 d") for 4
dosings (i.e., dosed on Days 0, 3, 6 and 9)). Using metabolic cages
for accurate measurements, group food consumption, group water
consumption, and group urine output were measured daily, and
individual body weight were monitored three times per week. FIG. 8
shows a dose-dependent change in body weight. FIG. 9 shows that
food consumption of the group receiving compound 1436 at 5 mg/kg
was lower than the other groups from Day 3 through Day 7 and lower
than vehicle or low dose 1436 from Day 7 through 13. The mid-dose
1436 group had lower food consumption than control or low dose on
Days 7 through 14. These reductions in food consumption preceded
body weight loss by a few days; the lag would be consistent with a
depletion of endogenous fuel storage (fat, glycogen, etc.). FIGS.
10 and 11 show a dose-dependent increase in urine output and water
consumption that temporarily aligns with reductions in body weight.
Water balance in the body is composed of intake via ingestion and
formation of metabolic water and output is via urine, feces and
insensible loss (perspiration, respiration). This study only
measured water ingested and urine output so the animals may be in a
negative water balance, even though water consumption was in excess
of urine output. This study suggests that both food consumption as
well as a diuresis (negative water balance) may contribute to the
suppression of body weight.
[0043] In a separate arm of the study, 10 CD-1 mice (5 mice/group)
were randomly assigned to receive either compound 1436 or vehicle
as control administered intraperitoneally once per day, every day
("QD") for 13 days (Days 0 to 12). Body weights were monitored
daily, and blood samples were obtained on Day 13 (one day post-last
administration). Plasma levels of electrolytes (in mEq) and
osmolality (in mOsm) were measured. The results in FIG. 12 show
that compound 1436 caused weight loss without changing the
isotonicity or electrolyte levels of plasma compared to vehicle
control mice.
EXAMPLE 2
Effect of Compound 1436 on Serum Glucose in db/db Mice
[0044] Age matched animals (4 females/group) were treated with
MSI-1436, 10 mg/kg via the i.p. route every 3 days for a total of 4
doses. Animals were provided food and water ad lib. At day 0, db/db
(untreated), db/db (treated), and db/+(untreated) cohorts weighed
28.1.+-.2.2, 30.8.+-.1.3 and 17.8.+-.0.9 gms, respectively. At day
20, 7 hours after the last feeding, blood was drawn and glucose
determined using a standard clinical glucose meter. Animals were
sacrificed and the body composition of the carcasses was determined
by published methods (Pellymounter, M. A., M. J. Cullen, M. B.
Baker, R. Hecht, D. Winters, T. Boone, and F. Collins. 1995.
Effects of the obese gene product on body weight regulation in
ob/ob mice. Science 269: 540-543). Over the 20 day period of the
study, the weight of untreated homozygotes increased from about 28
to 39 grams. Treated animals dropped from about 31 to 20 grams,
losing significant fat and water stores as well as a small but
significant fraction of lean mass (Table 1). Treated homozygotes
retained more fat than a comparable group of phenotypically normal
(but untreated) db/+heterozygotes (Table 1). Note that the severe
hyperglycemia of the db/db homozygote was corrected, reduced from
465.0 mg/dl to 53.5 mg/dl (Table 1).
TABLE-US-00001 TABLE 1 Effects of MSI-1436 on body composition and
serum glucose in obese mice Body Composition Serum Water Fat Lean
mass Glucose Mice Treatment g % g % g % (mg/dl) db/db saline 12.6
32.4 20.7 52.8 5.8 14.8 465.0 db/db MSI-1436 7.3.sup.b 36.6
8.7.sup.c 42.8.sup.a 4.2.sup.a 20.6.sup.c 53.5.sup.c db/+ saline
10.4 53.6 3.9 19.6 4.9 25.5 94.8 P-values (two-sided) are based on
comparison of the treated and untreated db/db groups. .sup.a0.01
< p .ltoreq. 0.05; .sup.b0.001 < p .ltoreq. 0.01; .sup.cp
.ltoreq. 0.001
EXAMPLE 3
Effect of MSI-1436 and Structural Analogues on Body Weight of CD-1
Mice
[0045] Experiments were performed using age-matched (4-5 weeks old)
male mice (Jackson Laboratories) provided food and water ad lib.
Mice corresponding to a single experimental cohort were housed
together in a single cage. Animals were used 1 week after arrival.
Lights were on from 0600 to 1800 and room temperature was kept at
21.+-.2.degree. C. Daily at 0800-1000 animals were weighed, food
and water replaced. Drug dosing was conducted with 10 mg/kg of each
compound via the i.p. route every 3 days for 4 doses, beginning on
day 0. The structures of the compounds used is shown in FIG. 13 and
the results in FIG. 14. Analogues that differ from MSI-1436 at only
a single stereocenter, such as MSI-1701 (the polyamine at C-3) or
MSI-1777 (the methyl at C-20) exhibit significantly reduced
activity, while MSI-1673 (the OH at C-7) is completely inactive.
The naturally occurring aminosterol, squalamine, identical to
MSI-1436 except for a difference in the polyamine, is inactive
highlighting the importance of a precise polyamine structure (not
shown). This can be further demonstrated by the analogue MSI-1750,
identical to MSI-1436, but differing by the substitution of the two
central amino groups of the spermine moiety with oxygens. Additions
of longer alkyl groups on the primary amine of the MSI-1436
molecule also reduces activity (MSI-1888), as does the addition of
a CH.sub.2OH group on C-24 (MSI-1839). The presence of the sulfate
on the C-24 hydroxyl moiety is required for activity (MSI-1521)
(not shown). However, chirality of the C-24 hydroxyl itself appears
to be relatively unimportant (MSI-1814). These studies suggest that
MSI-1436 affects weight loss through a specific pathway, rather
than as a consequence of a "non-specific" side effect of this
chemical class of substance.
EXAMPLE 4
Extended Dosing of ob/ob Mice with MSI-1436
[0046] Male ob/ob mice received weekly dosing of MSI-1436. All
doses were administered via the i.p. route (8 animals/dosing level)
on Mondays in the A.M. Animals were provided standard mouse chow
and water ad lib. Dosing was stopped (FIG. 15 A, large circles) or
resumed (FIG. 15 A, large X) at various times, as noted. Animals in
the 20 mg/kg and 10 mg/kg groups were euthanized at days 16 and 30,
respectively due to extreme emaciation. Animals being treated
weekly at 3.1 mg kg/week stopped receiving MSI-1436 at day 21.
MSI-1436 produces a dose dependent reduction in weight gain.
Animals receiving 10 or 20 mg/kg/wk lose excessive weight and grow
emaciated and moribund within several weeks (FIG. 15 A). However,
safely managed weight control (i.e., no deaths) was possible over a
four-month period using an intermittent dosing regimen (FIG. 15 A,
3.1 mg/kg/week cohort). When weight fell to about 10% above
starting weight, MSI-1436 dosing was stopped, permitting a
continued but limited decline in weight; as feeding increased, and
weight recovered, dosing resumed.
[0047] Following overnight restriction of food, an oral glucose
tolerance test was conducted on day 65 on this group, on an
untreated group of ob/ob mice, and on a cohort of wt/wt mice of the
ob/ob background strain (C57BL/6J) of the same age. Each animal
received 5 ml/kg of 30% glucose by gavage. Blood was drawn by tail
vein puncture at indicated times and blood glucose measured used a
clinical glucose-meter (Life Scan, model One-touch II) (FIG. 15 B).
The test revealed a normal metabolic response in the MSI-1436
treated group, in contrast to the diabetic pattern in the
vehicle-treated cohort (FIG. 15 B).
[0048] Serum cholesterol was measured at study termination. Animals
had received their last doses of MSI-1436 one week prior. Blood was
drawn after overnight food restriction, and cholesterol measured by
automated methodology (Vet-Test model 8008, IDEXX Labs) (FIG. 15
C). It was seen that serum cholesterol was normalized in animals
with controlled weight gain (1.0 and 3.1 mg/kg/week) regardless of
their absolute weight (FIG. 15 C).
[0049] III. Therapeutic Administration and Compositions
[0050] The mode of administration of compound 1436 and the other
aminosterol compounds may be selected to suit the particular
therapeutic use. Also, the compound can be administered to any
subject for whom treatment is believed to be beneficial, but
administration to humans or other mammals is particularly preferred
in the invention. Modes of administration generally include, but
are not limited to, transdermal, intramuscular, intraperitoneal,
intravenous, subcutaneous, intranasal, inhalation, intralesional,
endothelial, and oral routes. The compounds may be administered by
any convenient route, for example, by infusion or bolus injection,
or by absorption through epithelial or mucocutaneous linings (e.g.,
oral mucosa, rectal, and intestinal mucosa, etc.), and the active
1436 ingredient may be administered together with other
biologically active agents. Administration may be local or
systemic.
[0051] In this application, the abbreviation "s.q." or "s.c." is
used to represent subcutaneous administration of compound 1436 or
other substances. The abbreviation "i.p." is used to represent
intraperitoneal administration of compound 1436 or other
substances. The abbreviation "i.v." is used to represent
intravenous administration of compound 1436 or other substances.
The abbreviation "i.m." is used to represent intramuscular
administration of compound 1436 or other substances. In certain
figures attached to this application, one graph axis is labeled
"RT." This stands for "reverse transcriptase," which relates to the
manner in which a viral enzyme can copy a RNA molecule into a DNA
copy. Those skilled in the art are familiar with this measurement
technique.
[0052] The present invention also provides pharmaceutical
compositions that include compound 1436 or another aminosterol
compound as an active ingredient. Such pharmaceutical compositions
include a therapeutically effective amount of compound 1436 (or a
pharmaceutically acceptable salt thereof) or another aminosterol
compound (or a pharmaceutically acceptable salt thereof and a
pharmaceutically acceptable carrier or excipient. Examples of such
a carrier include, but are not limited to, saline, buffered saline,
dextrose, water, glycerol, ethanol, and combinations thereof. The
particular form and formulation of the pharmaceutical composition
should be selected to suit the mode of administration and can be
determined and selected by the skilled artisan, e.g., through
routine experimentation.
[0053] The pharmaceutical composition, if desired, also may contain
minor amounts of other conventional agents, such as wetting or
emulsifying agents, or pH buffering agents. The pharmaceutical
composition may be in any suitable form, such as a liquid solution,
suspension, emulsion, tablet, pill, capsule, sustained release
formulation, or powder. The pharmaceutical composition also may be
formulated as a suppository, with traditional binders and carriers,
such as triglycerides. Oral formulations may include standard
carriers, such as pharmaceutical grades of mannitol, lactose,
starch, magnesium stearate, sodium saccharine, cellulose, magnesium
carbonate, etc.
[0054] Various delivery systems are known and may be used to
administer a therapeutic compound of the invention, e.g.,
encapsulation in liposomes, microparticles, microcapsules and the
like.
[0055] In one embodiment, the pharmaceutical composition is
formulated in accordance with routine procedures as a
pharmaceutical composition adapted for intravenous administration
to humans. Typically, compositions for intravenous administration
are solutions in sterile isotonic aqueous buffer. Where necessary,
the pharmaceutical composition also may include a solubilizing
agent and a local anesthetic to ameliorate pain at the site of the
injection. Generally, the ingredients are supplied either
separately or mixed together in unit dosage form, for example, as a
dry lyophilized powder or water-free concentrate in a hermetically
sealed container such as an ampule or sachet indicating the
quantity of active agent. Where the pharmaceutical composition is
to be administered by infusion, it may be dispensed with an
infusion bottle containing sterile pharmaceutical grade water or
saline. Where the pharmaceutical composition is administered by
injection, an ampoule of sterile water for injection or saline may
be provided so that the ingredients may be mixed prior to
administration.
[0056] The amount of the therapeutic compound of the invention that
will be effective in the treatment of a particular disorder or
condition will depend on the nature of the disorder or condition,
and this amount can be determined by standard clinical techniques
known to those skilled in the art through routine experimentation.
The precise dose to be employed in the pharmaceutical composition
also will depend on the route of administration and the seriousness
of the disease or disorder, and should be decided according to the
judgment of the practitioner and each patient's circumstances.
Effective therapeutical doses may be determined from extrapolations
of dose-response curves derived from in vitro or animal-model test
systems.
[0057] The following dosage ranges are exemplary. Suitable dosages
for intravenous administration are generally about 20 micrograms to
40 milligrams of active compound per kilogram body weight. Suitable
dosage ranges for intranasal administration are generally about
0.01 mg/kg body weight to 1 mg/kg body weight. Suitable dosage
ranges for topical administration are generally at least about
0.01% by weight. Suitable dosages for oral administration are
generally about 500 micrograms to 800 milligrams per kilogram body
weight, and preferably about 1-200 mg/kg body weight. Suppositories
generally contain, as the active ingredient, 0.5 to 10% by weight
of the aminosterol active ingredient. Oral formulations preferably
contain 10% to 95% active ingredient.
[0058] Exemplary dosages of the aminosterol active ingredient for
most pharmacological or therapeutical uses fall within the range of
about 0.01 mg kg body weight to about 100 mg/kg body weight.
Preferred dosages are from 0.1 to 25 mg/kg body weight.
[0059] For subcutaneous administration, applicants have performed a
pharmacokinetics study of the administration of compound 1436 in a
mouse model. For this test, compound 1436 was administered s.q. at
a dose of 10 mg/kg in mice. The peak 1436 concentration in the
blood plasma from this 10 mg/kg dose was about 175 .mu.g/ml after a
time of about 2 hours. After 48 hours, the 1436 concentration is
still about 10-15 .mu.g/ml. This data indicates that relatively
small 1436 doses may be used for s.q. administration. This data
also provides an indication that oral dosing of 1436 will be
effective.
[0060] The invention also may include a pharmaceutical pack or kit
including one or more containers filled with pharmaceutical
compositions in accordance with the invention. Associated with such
containers may be a notice in the form prescribed by a government
agency regulating the manufacture, use or sale of pharmaceuticals
or biological products, which notice reflects approval by the
agency of manufacture, use or sale for human administration.
[0061] By the term "effective amount" in this application,
applicants refer to a suitable amount of the active ingredient of
the invention, with an appropriate carrier or excipient, including
a sufficient amount of the active ingredient to provide the desired
effects or results. The effective amount can be readily ascertained
by those skilled in the art through routine experimentation.
[0062] In describing the invention, applicant has stated certain
theories in an effort to disclose how and why the invention works
in the manner in which it works. These theories are set forth for
informational purposes only. Applicants do not wish to be bound by
any specific theory of operation.
[0063] While the invention has been described in terms of various
specific preferred embodiments and specific examples, those skilled
in the art will recognize that various changes and modifications
can be made without departing from the spirit and scope of the
invention, as defined in the appended claims.
* * * * *