Today on Fox News Live
with E.D. Hill, we discussed a new
weight loss pill, Acomplia
(rimonabant). This pill currently
being sold in Europe has been seen
by many patients struggling with
obesity as a "miracle
pill."
Many studies have shown that
this medication helps patients
loose weight when compared to a
placebo. Most of the weight
reduction results from patients
limiting the number of calories
they consume on a daily basis.
Acomplia helps to control
appetite-- something that for many
patients involved in weight
reduction programs is a major
obstacle to success.
Even though the safety of the
medication is being monitored, no
major problems have yet been
reported. There are some mild side
effects that people should be
aware of, including nausea,
dizziness, anxiety and depression.
Many Europeans have accepted
the efficacy of this medication.
Sweden, for example, has approved
reimbursement of the drug through
their public service program.
How does it work? It controls
the urge to eat. Many are calling
this the "anti munchie
effect." Acomplia works in
the central nervous system by
affecting the cannabioids
receptors in the brain.
Yes, the same receptors that give
people the urge to eat when
exposed to marijuana.
NEW YORK
- A pill that helps you lose
weight and quit smoking? That was
amazing enough to capture
headlines last week. But
scientists say the experimental
drug might be even more versatile,
providing a new tool to help
people stop abusing drugs and
alcohol, too.
It’s
called rimonabant, or Acomplia,
and last week researchers reported
it could help people not only lose
weight but keep it off for two
years.
That
burnished the drug’s reputation
after two studies in March, which
suggested it could fight both
obesity and smoking, two of
humanity’s biggest killers
RIMONABANT
The
French pharmaceutical firm
Sanofi-Aventis plans to seek
federal approval for rimonabant
next year.
But the
drug’s benefits may go beyond
just smokers and obese people,
researchers say.
“I
think it’s going to have a big
impact on the treatment of
addiction,” said Dr. Charles
O’Brien, an addiction expert at
the University of Pennsylvania and
the Philadelphia Veterans Affairs
Medical Center.
Animal
studies suggest rimonabant can
block the effects of marijuana and
fight relapse in alcohol and
cocaine abuse, he said. Once it is
approved for treating obesity or
smoking, “we’ll be free to
study it in these other areas and
I’ll try to get my hands on it
as quickly as possible,”
O’Brien said.
He’s
not alone in his enthusiasm.
Halting
the brain's reward system
The National Institute on Alcohol
Abuse and Alcoholism is interested
in seeing whether rimonabant can
help treat heavy drinkers, said
Dr. George Kunos of the institute.
No human test results for
rimonabant in alcohol abuse have
yet been published, he said.
But
researchers at the National
Institute on Drug Abuse reported
in 2001 that a single dose of the
drug could block the effects of
smoked marijuana in people, not
just animals. That suggests the
drug could be useful in treating
marijuana dependence, said Marilyn
Huestis, principal investigator of
the study. The institute is now
pursuing follow-up research, said
Huestis, acting chief for
chemistry and drug metabolism
research at NIDA.
Rimonabant’s
versatility traces back to its
effects on the brain’s reward
system, circuitry that tells you
to keep on doing something.
Basically, it appears to help
break the connection between an
activity like smoking and the
rewarding feeling it causes in the
brain.
The body
has its own marijuana-like
substances called endocannabinoids,
and they activate certain brain
cells that in turn can lead to
stimulation of the brain’s
reward system. Pleasurable things
like drinking alcohol are thought
to activate a feeling of reward by
acting through the endocannabinoid
system.
“We
think that the (endocannabinoid)
system is overactivated by chronic
smoking, or perhaps even excessive
overeating,” said Dr. Robert
Anthenelli of the University of
Cincinnati College of Medicine and
the Cincinnati Veterans Affairs
Medical Center. He’s on the
advisory board of Sanofi-Aventis.
Rimonabant
blocks the effect of the natural
endocannabinoids by keeping them
from latching onto the brain cells
they normally stimulate, he said.
In smokers, for example, that
seems to restore the natural
balance of the brain reward
circuitry, he said.
What makes us fat? A
generation ago, the answer was
simple -- eating more than we
needed to.
That may still be true, but
researchers investigating the
genetics behind appetite,
metabolism and weight gain have
learned that putting on pounds
is much more complicated than a
simple equation of calories.
They're finding certain genes
allow some people to pig out and
not gain weight, while others
put on pounds after a slight
overindulgence. Other research
has shed light on genes that may
play a role in how much we crave
food.
weight loss
But can these findings lead
to surefire treatments to tackle
this country's growing weight
problem? A consensus among
scientists is surprisingly
optimistic.
"I truly believe that
the discovery of obesity
susceptibility genes will
identify new molecules and
pathways that will lead to
effective new medications and
other interventions," said
Dr. Alan Shuldiner, head of
endocrinology, diabetes and
nutrition research at the
University of Maryland's School
of Medicine. Shuldiner adds,
however, "I do not think
this will occur in the near
future."
Still, Andrew Greenberg,
director of obesity and
metabolism studies at Tufts
University, pointed out that
obesity research has accelerated
in recent years, and that's
bound to help scientists find
cures sooner.
"The Internet has
changed science," he said.
"It has changed the pace at
which we learn about each
other's research and then build
on it. Advances are happening
faster than ever before."
Rimonabant
An Anti-Obesity Wonder Drug?
In fact, the introduction of
new treatments has already
begun. In the coming year, the
French pharmaceutical giant
Sanofi-Aventis plans to release
what many believe could be one
of the first truly effective
anti-obesity drugs. Preliminary
data from large trials have
suggested that weight loss is
much greater than with any
current drugs on the market.
The drug, rimonabant, targets
receptors of cannabinoid 1,
which stimulates appetite and
other cravings (including
nicotine) in the brain. By
blocking cannabinoid 1's
receptors, rimonabant helps
people beat their cravings and
lose weight.
Shuldiner said so far the
trials for rimonabant have been
"very impressive. "I
believe it will be a very useful
agent forweight loss. But not
the end-all."
While a drug like rimonabant
is designed to help any person
beat cravings and lose weight,
part of finding
"end-all" treatments
may lie in figuring out how
people's genetics vary and
tailoring drugs to match.
A recent study in Spain has
offered insight into one such
variation. The research,
published in the Journal of
Clinical Endocrinology &
Metabolism, examined the role of
a gene that may lie behind a
phenomenon that so many find
frustrating -- you cut back
calories but still don't lose
weight at the same pace as your
thinner friends. Jose Ordovas,
director of nutrition and
genomics research at Tufts
University, said those
frustrated dieters may share a
variation in a gene called
perilipin.
Rimonabant Targeting a Fat Guardian
Perilipin, he explained,
creates a protein that settles
around fat droplets and protects
the fat from being destroyed.
"That may sound funny
these days," Ordovas said.
"But in old times, fat was
difficult to hold on to, so this
protein protected it."
Some versions of the
perilipin gene (originally
identified by Greenberg and
colleagues) make this fat
bodyguard stronger, while other
mutations make it weaker.
"This means we have
identified one of probably many
genetic variations that help us
distinguish between those who
will and won't respond to
diet," said Ordovas.
"Some people think that
patients don't lose weight
because they don't follow the
recommendations. But in some
cases, their bodies may just be
more thrifty with the fat."
Figuring out how people's
genes react differently when it
comes to weight loss might also
help prevent dangerous side
effects to obesity-fighting
drugs as they emerge on the
market.
Many may remember the
controversy over phen-fen, a
once popular obesity-fighting
combination of drugs that was
recalled in 1997 after some
studies and reports showed it
caused heart problems in some
patients. By tailoring drugs to
people with specific genomes,
drug manufacturers may be able
to avoid such fallouts in the
future.
WEIGHTLOSS
"Sometimes side effects
only affect a minority of
people," said Ordovas.
"In the future, we can
identify drugs and supplements
and target them to people with
specific genetic profiles."
The pace at which scientists
identify new obesity-related
genes has stepped up in the past
few years as genetic research
gains momentum. But Greenberg
cautions that not every new
discovery means new cures are on
the way.
"We've come a long way
in understanding obesity,"
he said. "But every study
has to be carefully replicated.
And exercise and diet will
always form the cornerstone of
any obesity treatment.
Rimonabant
