Yesterdays Public Relation announcement on the Dr. Schneider's
GM1 ganglioside treatment of Parkinson's disease was an early pilot
study for the safety and efficacy of using GM1.
The initial trial consisted of 10 Parkinson's patients excluding those
with the presence of signs indicative of progressive supranuclear
palsy or suspected Parkinson-plus syndromes, focal or lateralized
abnormalities on neurologic examination (other than parkinsonism),
or history of any of the following: infective or inflammatory brain
disease; alcohol or drug abuse; recent acute myocardial infarct;
severe psychiatric disturbance; hepatic, renal, hematologic, or
endocrine disease; multiple episodes of head trauma associated
with sustained loss of conciousness; or Guillain-Barre syndrome
(GBS).
All patients received an IV loading dose if 1,000 mg GM1 administered
over a 30 minute period. Patients were sent home with a 4-week
supply of GM1, which they were trained to administer to themselves
by subcutaneous injection. They returned each 4 weeks for testing and
were sent home with another 4 week supply until the 12th week when
they were sent home with a 6 week supply. Each patient
self-administered two injections/day for a total daily dose of 200 mg
of GM1.
Two patients dropped out of the study. Eight patients completed
the full 18-week course of treatment.
When the individual items from UPDRS motor examination were
analyzed, most of the improvements resulted from decreased
rigidity and bradykinesia scores.
Several patients reported improvements in walking ability,
ability to dress themselves, overall level of energy, and manual
dexterity.
GM1 was provided by Fidia Pharmaceutical Corporation.
----------------- Start of Press Release ------------------------
06/22 0806 CLINICAL TRIALS BEAR OUT PROMISE OF NEW ...
A pilot clinical trial showed encouraging evidence that the
drug GM1 ganglioside is effective at substantially reducing
some of the functional impairments caused by Parkinson's disease.
Those results, reported in the June issue of Neurology, are
the basis for controlled trials being conducted at Medical
College of Pennsylvania and Hahnemann University (MCPHU),
Philadelphia.
Unlike two controversial Parkinson's procedures recently
under public discussion -- fetal cell transplant and pallidotomy
surgery -- GM1 ganglioside is non-invasive, self-administered and
potentially more accessible to Parkinson's patients.
The drug appears to enhance the brain's ability to produce
the key neurotransmitter dopamine; it is the lack of dopamine
that leads to the tremors, rigidity and cognitive problems that
mark Parkinson's.
"Though the precise mechanism is not clear, GM1 ganglioside
may rescue damaged dopamine neurons, stimulate them to repair
themselves, promote growth of new dopamine terminals on the
neurons -- and perhaps even stimulate remaining dopamine neurons
to produce more than their normal amount of dopamine," said the
study's lead author, Jay Schneider, Ph.D., professor of anatomy,
neurobiology and neurology, MCPHU.
Dr. Schneider and his colleagues reported that the
functional improvements brought about by the drug continued for
the duration of the study. Improvements in motor skills and
activities-of-daily-living included decreased rigidity and
bradykinesia (abnormally slow movement); reduced time required to
perform physical tasks; greater ease in walking and dressing, and
an increased energy level. Cognitively, the patients were less
distractible.
Parkinson's disease, a progressive neurological disorder
that destroys muscular control, afflicts 1 percent of all
Americans over age 55. It is marked by abnormally slow movement,
uncontrollable tremors, stooped posture and a shuffling gait.
"Given a very long life, most people would suffer some
effects of the brain's naturally decreasing production of
dopamine," Dr. Schneider explained. "Unfortunately, Parkinson's
causes a loss of dopamine-producing cells above and beyond that
seen in normal aging, and it accelerates the consequences of
having too little dopamine in the brain."
Doctors currently treat most Parkinson's patients with
L-dopa, which acts as a replacement for their own dopamine.
"While L-dopa ameliorates the symptoms, it loses its efficacy
within a few years, often causes undesirable side effects, and
does not deal with the underlying loss of dopamine-producing
neurons," Dr. Schneider noted.
Given that GM1 fosters repair and revitalization of
remaining neurons, but does not create new neurons, it may prove
most effective in early stages of the disease, he said.
"However, since laboratory research suggests that only a small
portion of the dopamine system needs to be spared or functionally
recovered to achieve normal motor and cognitive skills, GM1 could
benefit even patients with more established Parkinson's disease
-- providing there are enough dopamine neurons remaining for GM1
to act on," Dr. Schneider suggested.
The Neurology report involved 10 patients with mild to
severe symptoms of the disease, most of whom had been taking
L-dopa. At the outset, the patients were given a battery of
tests to assess their functional abilities; those tests were
repeated four times over an 18-week period. Each patient
received a large intravenous dose of GM1 at the trial's
beginning, then self-administered 200 mg of the drug each day by
injection. Eight patients completed the full 18-week treatment;
two patients dropped out early, feeling they were not benefitting
from the trial.
Among those eight participants, significant improvements in
motor skills and ability to perform activities-of-daily-living
occurred in the first eight weeks of the trial and stabilized
over the remaining 10 weeks.
"While the results of this initial study are encouraging, we
must be careful not to overstate the significance of these
findings," Dr. Schneider observed. "Since the patients in this
study all knew they were receiving a new drug, their function may
have improved due to psychological factors unrelated to the
medication. Yet, since some patients have maintained their
original improvement over almost two years now, it is hard to
argue these effects are due primarily to psychological factors."
The current clinical trial is a double blind, placebo
controlled study of 50 patients. If that trial also demonstrates
safety and effectiveness in GM1 treatment, the next step would be
a multicenter trial that could begin as early as 1996.
The big question Dr. Schneider and his colleagues will
ultimately try to answer as their research progresses is whether
early enough treatment with GM1 or related drugs could alter the
course of the underlying disease.
GM1 ganglioside is a normal constituent of nerve cell
membranes and is known to moderate a number of neuron surface and
receptor activities. The type of GM1 used in this study was
extracted from cow brain.
Dr. Schneider is also studying a semi-synthetic derivative
of GM1, called LIGA 20, which could prove even more effective in
restoring the function of the dopamine system.
The MCPHU research was funded by the F.M. Kirby Foundation,
the Marion and Joseph Wesley Foundation, the Alzheimer's Disease
Research Center at Hahnemann, and through donations to the
Parkinson's Disease Research Fund at Hahnemann.
Dr. Schneider's co-authors of the Neurology report were
MCPHU colleagues David Rothblat, Ph.D., Jillian Chapas-Crilly,
B.S., and Louisa Seraydarian, Ph.D.; David Roeltgen, M.D., of The
Health Education and Research Foundation of Williamsport (Pa.)
Hospital, and Jayaraman Rao, M.D., of Louisiana State University
Medical Center.
-------------------------- End of Press Release --------------------
The following are other abstracts on the previous hypothsis and usages
of GM1.
<1>
Authors
Schneider JS. Yuwiler A.
Institution
Department of Neurology, Hahnemann University School of Medicine,
Philadelphia, Pennsylvania 19102.
Title
GM1 ganglioside treatment promotes recovery of striatal dopamine
concentrations in the mouse model of MPTP-induced parkinsonism.
Source
Experimental Neurology. 105(2):177-83, 1989 Aug.
Abstract
GM1 ganglioside (GM1) has in the past been reported to promote
regenerative sprouting and functional recovery in both central and
peripheral nervous systems. The present experiments were performed in
order to investigate whether GM1 might have any therapeutic effect on
young mice who had been exposed to the Parkinson-producing neurotoxin
MPTP. GM1 caused moderate to dramatic increases in striatal dopamine
levels, depending upon duration of exposure to GM1, in animals previously
exposed to MPTP. Furthermore, the effects of GM1 on enhancing striatal
dopamine levels were apparent when GM1 administration was delayed until 3
days after the last MPTP injection was given and these effects were not
reversed when GM1 was withdrawn. Tyrosine hydroxylase (TH)
immunohistochemistry of the striatum demonstrated increased numbers of
TH-positive fibers and TH-positive terminal fields in GM1-treated animals
as compared to animals that received only MPTP. TH immunohistochemistry of
the substantia nigra revealed little or no loss of parts compacta neurons
in the MPTP-treated mice. On the basis of these observations, GM1 appears
to increase the dopamine content of the striatum by promoting or
stimulating regenerative sprouting of dopaminergic terminals and perhaps
collateral sprouting from remaining intact fibers in the MPTP model of
Parkinsonism in the young mouse. We suggest that GM1 ganglioside may hold
some promise as a potential adjunct in the treatment of Parkinson's
Disease.
<2>
Authors
Chapman J. Sela BA. Wertman E. Michaelson DM.
Institution
Department of Biochemistry, Faculty of Life Sciences, Tel-Aviv University,
Ramat, Israel.
Title
Antibodies to ganglioside GM1 in patients with Alzheimer's disease.
Source
Neuroscience Letters. 86(2):235-40, 1988 Mar 31.
Abstract
Gangliosides are thought to have a role in neuronal development and
regeneration while anti-ganglioside antibodies have been shown to impair
these processes. In the present work we examined whether the neuronal
degeneration in Alzheimer's disease is associated with the presence of
anti-ganglioside antibodies. A significant level of antibodies specific to
ganglioside GM1 but not to other gangliosides (GD1a, GD1b, GT1b and GQ1b)
was found in patients with Alzheimer's disease as compared to normal age
matched controls. A high level of antibodies to GM1 was also found in
patients with multi-infarct dementia and Parkinson's disease with dementia
but not in non-demented patients with other neurodegenerative diseases.
These results may reflect a specific change in ganglioside metabolism
which is associated with the neurodegenerative processes underlying
Alzheimer's disease and other causes of dementia.
<3>
Authors
Agnati LF. Fuxe K. Calza L. Goldstein M. Toffano G. Giardino L. Zoli
M.
Title
Further studies on the effects of the GM1 ganglioside on the degenerative
and regenerative features of mesostriatal dopamine neurons.
Source
Acta Physiologica Scandinavica. Supplementum. 532:37-44, 1984.
Abstract
By means of computer assisted morphometry and microdensitometry the
effects of chronic GM-1 ganglioside treatment have been further evaluated
on the degenerative and regenerative features of mesostriatal DA neurons
in the rat brain. In this study mainly a rostrocaudal morphometrical
analysis was performed in the substantia nigra of the lesioned side. The
specificity of the action of the GM-1 ganglioside on the substantia nigra
DA cells was evaluated by a comparison with antiinflammatory drugs such as
betametazon and acetylsalicylic acid. In the rostrocaudal analysis it was
demonstrated that chronic GM-1 treatment preferentially protected the
caudally located dopamine nerve cells from degeneration after partial
hemitransection, while instead this chronic GM-1 treatment increased
tyrosine hydroxylase immunoreactivity mainly within the rostrally located
DA nerve cells present close to the site of the lesion. Furthermore, the
specificity of the GM-1 action was demonstrated by the absence of
protective effects of chronic treatment with betametazon and
acetylsalicylic acid on the dopamine nerve cells of the lesioned side.
These results open up the possibility that chronic GM-1 treatment, by
exerting a stimulatory metabolic action on the DA nerve cells located
close to the lesion, can enhance the production of neurotrophic factors in
these cells, which in turn can diffuse out to increase the survival of the
less severely lesioned DA nerve cells located in the caudal part of the
substantia nigra. These results indicate that chronic GM-1 treatment may
be beneficial in the treatment of neurons undergoing degeneration, which
takes place e.g. in Parkinson's disease and after mechanical injury to the
brain due to accidents or neurosurgical operations.
John Cottingham [log in to unmask] OR [log in to unmask]
