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May 1st, 2012 
FAKE NEWS for the Zionist agenda TUESDAY, May 1 (HealthDay News) — Researchers have found new
evidence showing that resveratrol, a compound found in red wine, may play
a role in preventing cell aging.
The study in rodents found that when mice had a particular gene —
SIRT1 — knocked out, or turned off, resveratrol had no effect on them.
But tests of muscle tissue in mice with a normal SIRT1 gene that were
given resveratrol found that the substance boosted mitochondrial
function.
Mitochondria provide the energy that cells need to function. A decrease
in mitochondrial energy production has been linked to a variety of
diseases, including diabetes and Alzheimer’s disease, as well as to the
aging process itself, said senior study author David Sinclair, a professor
of genetics at Harvard Medical School in Boston.
But don’t go reaching for that Chianti yet. Yes, resveratrol is found
in the skin of red grapes. But “the amounts we gave to our mice would be
like drinking 100 glasses of red wine a day,” Sinclair said.
Instead, the goal is to develop synthetic resveratrol compounds that
activate SIRT1 and could be taken as medication. “My colleagues are in the
middle of developing better molecules that we hope will be medicines that
will be used to treat diseases of aging, not to extend lifespan, though
that may be a side effect,” Sinclair said.
The study is in the May 1 issue of Cell Metabolism.
While previous studies have also suggested that resveratrol may have
anti-aging properties, the precise mechanism of resveratrol has been
controversial. Several studies, including work with yeast, worms and
flies, have found that resveratrol acts on a class of seven genes known as
sirtuins and, in human cells, SIRT1 in particular.
But other researchers have argued that resveratrol may work by
activating a separate energy pathway called AMPK, which is also related to
mitochondrial energy production but does not involve sirtuin genes.
Testing the effect of resveratrol on SIRT1 in mice was difficult,
Sinclair said. Mice that have their SIRT1 gene deleted are born with
developmental defects and are unsuitable for experiments, he
explained.
So Sinclair and two graduate students, Nathan Price and Ana Gomes,
worked for years to come up with a method for knocking out SIRT1 in
healthy adult mice.
“Our paper found you absolutely require the SIRT1 gene for resveratrol
to improve the metabolism of the mice,” Sinclair said.
The paper also showed that the AMPK pathway was activated in mice given
high doses of resveratrol, yet there was no benefit to mitochondrial
function. There was no effect on AMPK in mice given a lower dose of
resveratrol.
Sinclair is co-founder and a consultant for Sirtris Pharmaceuticals
Inc., which is developing resveratrol-like molecules for use as treatment
for age-related diseases. In 2010, according to news reports, the company,
which is owned by GlaxoSmithKline, halted clinical trials of resveratrol,
but Sinclair said the company continues to develop improved synthetic
molecules.
George Vlasuk, CEO of Sirtris, said the new findings offer the “first
definitive evidence” for a direct link between SIRT1 and the metabolic
benefits of resveratrol.
“The work by [first author] Price et al. strongly supports the basic
rationale being pursued at Sirtris, which focuses on the development of
small-molecule compounds that directly activate the enzymatic activity of
SIRT1 as a new therapeutic approach to many diseases of aging,” Vlasuk
wrote in an email to the journal.
Philippe Marambaud, an investigator at the Litwin-Zucker Center for
Research in Alzheimer’s Disease and Memory Disorders at the Feinstein
Institute for Medical Research in Manhasset, N.Y, said the new research
adds to a body of evidence that resveratrol can potentially combat aging
by boosting mitochondrial activity.
“In this study, by using an elegant adult-inducible SIRT1 knock-out
mouse model, the authors now provide compelling evidence that SIRT1 is
required in vivo [in the animal] for the effect of resveratrol on AMPK
activation and on mitochondrial function,” Marambaud said.
While studies involving animals can be useful, they frequently fail to
produce similar results in humans.
“A mouse model is not a human being, especially when you are
genetically manipulating this animal model, you want to be very careful,”
Marambaud said. “This field has been extremely controversial. We should be
very careful about claiming the importance of resveratrol for medical
purposes. We have to wait and see, but this study is a big step
forward.”
More information
The U.S. Centers for
Disease Control and Prevention has more on healthy aging.
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