Drug-maker Pfizer is
testing an experimental drug called capromorelin as a
new anti aging treatment. The new anti aging drug is a
growth-hormone stimulator that is meant to force the body to
secrete human growth hormone like it did during adolescence.
During a person's teen and young-adult years, the body
increases production of growth hormones, which are associated
with a buildup of lean muscle mass and strength.
As a person ages, growth hormone levels gradually decrease. Dr.
George Merriam of the University of Washington/VA Puget Sound Health Care System led the anti aging capromorelin research.
Patients are reported to have gained an average
of three pounds in lean muscle mass after six months on the
drug, and they showed improvement in strength, balance and
coordination. A little under 400 men and women aged 65 to 84
participated in the anti aging study. While low levels of
growth hormones are associated with less lean muscle mass, it
is well known that people can maintain strength and health
through physical activity and weight-bearing exercise.
Dr. Agnieszka Baranowska-Bik and colleagues at
the University of Poland recently studied 133 women ranging in
age from 20 to 102. Surprisingly, the researchers found that
the women aged over 100 were healthier than many of their
younger counterparts. The centenarians had lower cholesterol
and better control of blood sugar, an indicator of diabetes
risk. Both Dr. George Merriam's drug test and Dr. Agnieszka
Baranowska-Bik's research were presented at the International
Congress of Neuroendocrinology.
Anti
Aging - Putting The Research into
Practice
by Karin Granstrom Jordan, M.D Ph.D.
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Scientists believe that humans
are made for a life span of approx 120 years. Why do so
few of us achieve this
potential? |
Getting older is not the real
problem- the diseases of aging are what we fear. So far,
modern medicine has done relatively little to prevent the
underlying disorders that tend to accelerate the aging process
and bring the vulnerability, pain, and suffering that we
associate with aging.
Anti aging research has discovered that aging is
accelerated by declining cellular energy production, free
radical damage, the "browning" of proteins by glucose
(glycation), and impaired immune defenses. We will examine
some fascinating recent anti aging research on key compounds
that have a strong potential for influencing these processes
and keeping you young (anti aging).
Anti Aging - Mitochondrial
decay
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Mitochondria are tiny structures within the cells
that convert nutrients into energy through the process
of cellular respiration |
. Mitochondrial decay-and the consequent decline in
cellular energy production-may be one of the most important
causes of cellular decline in aging.
This age associated mitochondrial dysfunction seems to a
great extent to be due to cumulative free radical damage as
well as a lack of important micronutrients in the cell. One
co-factor that is critical for the transport of proteins in
the mitochondria is a phospholipid called cardiolipin.
Coenzyme Q10 is another cofactor that participates directly in
energy production. Both of these mitochondrial cofactors
decline with age
Cellular energy production itself produces free radicals
that can damage cell structures, including the mitochondria,
and ultimately lead to various diseases if the body's natural
antioxidant (anti aging) capacity is inadequate.
Acetyl-L-carnitine and lipoic acid are both endogenous
(naturally present in the body) antioxidants (anti aging) that
have been shown to restore mitochondrial function and reduce
free radical damage. (Hagen TM et al., 1998; Lyckesfeldt J et
al., 1998). Together with coenzyme Q10, they work to maintain
the function of the mitochondria.
Acetyl-L-carnitine enhances energy production by
facilitating the transport of fatty acids into the
energy-producing units in the cells. In two animal studies
from the University of California at Berkeley (Hagen TM et
al., 1998) acetyl-L-carnitine significantly reversed
age-associated mitochondrial decay ( anti aging ). It
increased cellular respiration, membrane potential and
cardiolipin levels.
Acetyl-L-carnitine has been shown to improve energy
production within brain cells and is considered a
neuroprotective agent because of its antioxidant ( anti aging
) action and membrane stabilizing effects. Several
controlled clinical studies in Europe show that
acetyl-L-carnitine slows down the natural course of
Alzheimer's disease in many important respects. (Calvani M et
al., 1992)
Remarkably, a 1995 study of acetyl-L-carnitine provided the
first demonstration that any drug or supplement could bring
about both clinical and neurochemical improvements in patients
with Alzheimer's disease (Pettegrew JW et al., 1995). Patients
given acetyl-L-carnitine (3g/day for 1 year) fared
significantly better than control patients on both the ADAS
(Alzheimer's Disease Assessment Scale) and MMS (Mini-Mental
Status) rating scales. The researchers used magnetic resonance
spectroscopy to measure neurochemical activity in the
patients' brains. They found that acetyl-L-carnitine
normalized the levels of key neurochemicals involved in neural
membrane function and energy metabolism (high-energy
phosphates and phosphomonoesters).
Anti
Aging - Lipoic acid
Alpha lipoic acid helps break down sugars so that energy
can be produced from them through cellular respiration. In
addition, recent research has discovered that alpha lipoic
acid plays a truly central role in antioxidant ( anti aging )
defense. It is an extraordinarily broad spectrum antioxidant
able to quench a wide range of free radicals in both aqueous
(water) and lipid (fat) domains. Moreover, it has the
remarkable ability to recycle several other important
antioxidants including vitamins C and E, glutathione and
coenzyme Q10, as well as itself! For these reasons, alpha
lipoic acid has been called the universal antioxidant ( anti
aging ).
In addition to serving as the hub of the body's antioxidant
( anti aging ) network, lipoic acid is the only antioxidant
that can boost the level of intracellular glutathione, a
cellular antioxidant of tremendous importance. Besides being
the body's primary water-soluble antioxidant and a major
detoxification agent, glutathione is absolutely essential for
the functioning of the immune system. Scientists have known
for a decade that maintaining a high cellular level of
glutathione is critical for life and crucial for health.
Raising glutathione levels has been shown to alter the
cytokine balance in favor of a Th1 immune response mode (the
anti-cancer and anti-viral mode of the immune defense-see
sidebar, "The immune system"). (Peterson JD et al., 1998).
Agents that deplete glutathione, such as ethanol, have been
shown to impair the body's immune defense. TNF-a (tumor
necrosis factor alpha), increased in many diseases of aging,
has been shown to be involved in depletion of cellular
glutathione. (Phelps DT et al., 1995). As we shall see later
in this article, TNF-a is thought to be a major factor in the
immune decline associated with aging.
People with chronic illnesses such as AIDS, cancer and
autoimmune diseases generally have very low levels of
glutathione. White blood cells are particularly sensitive to
changes in glutathione levels, and even subtle changes may
have profound effects on the immune response. It was shown
that glutathione deficiency in HIV-infected individuals
correlates with decreased survival (Herzenberg LA et al.,
1997).
The practical problem for those who wish to maintain
healthful glutathione levels is that taking glutathione itself
as a supplement does not boost cellular glutathione levels,
since glutathione breaks down in the digestive tract before it
reaches the cells. Therefore, the discovery that lipoic acid
can effectively boost glutathione levels has very important
implications in the prevention and treatment of numerous
diseases.
In a number of experimental and clinical studies, lipoic
acid has now been shown to be useful in the treatment of such
conditions as diabetes, ischemia-reperfusion damage,
neurodegeneration, heavy-metal poisoning, radiation damage and
HIV infection and may offer significant protection against
stroke, heart disease and cataracts (Packer L et al., 1995).
It is likely that much of the beneficial effect of lipoic acid
may be attributed to its ability to increase levels of
glutathione, chelate metals (such as iron and copper), quench
diverse free radicals, and recycle antioxidants.
Anti
Aging - Inhibiting glycation
Glycation is the name of a process in which glucose reacts
with protein in an undesired way, resulting in sugar-damaged
proteins (similar to browning food in the oven!) called
advanced glycation end products (AGE). The formation of AGE
happens in everyone and is a major factor in the aging process
itself. These damaged proteins may lead to premature signs of
aging (wrinkles and brown spots) and in the long run to
damaging effects on most organ systems within the body.
Glycation reactions are accelerated in the diabetic patient
and contribute to the development of diabetic
complications.
It has been observed that glycated proteins produce 50-fold
more free radicals than nonglycated proteins. As a result of
this, AGE exert multiple detrimental effects in the body. For
example, AGE induced free radicals activate the
proinflammatory cytokine TNF-a (tumor necrosis factor alpha),
known to be elevated in the elderly. TNF-a has been shown to
be particularly high in inflammatory diseases of the central
nervous system (Alzheimer's disease, multiple sclerosis and
ischemia) and is considered to promote neurodegeneration
(Venters HD et al., 1999).
AGE formation is increased under conditions of oxidative
stress, such as glutathione depletion that can for example be
found in the substantia nigra in the brain of patients with
Parkinson's disease. Glutathione is suggested to be the
decisive factor that triggers the formation of Lewy bodies in
pre-symptomatic cases of this disease.
The amino acid carnosine is a natural AGE inhibitor found
in high concentrations in the brain, muscle tissue and the
lens of the human eye. It is also known to be an antioxidant
capable of protecting cell membranes and other cell
structures. In vitro studies demonstrated that carnosine
inhibits glycosylation and crosslinking of proteins induced by
reactive aldehydes, and that it is effective in reducing AGE
formation by competing with proteins for binding with the
sugars. The authors suggest that this nontoxic compound should
be explored in the treatment of such conditions as diabetic
complications, inflammatory disorders, alcoholic liver disease
and possibly Alzheimer's disease (Hipkiss AR et al.,
1998).
Many additional functions for carnosine have been
suggested, such as immunomodulator, neurotransmitter, metal
ion chelator and wound healing agent. In a series of animal
studies it was demonstrated that carnosine was effective in
overcoming muscle fatigue, lowering blood pressure, reducing
stress and hyperactivity and inducing sleep (Quinn PR et al.,
1992). More recently carnosine was shown to delay senescence
in cultured human fibroblasts (McFarland GA et al., 1994).
In an animal study on the effect of carnosine in the
ischemic brain, carnosine had a protective effect, preserving
nerve cells from damage and death, suggesting that this amino
acid might be a promising treatment for patients with stroke
(Stvolinsky, SL et al., 1998). In other studies carnosine was
shown to be effective in the treatment of senile cataracts in
dogs, suggesting the possible use of carnosine in the
prevention and treatment of cataracts in humans (Halliwell B
et al., 1985).
Along with carnosine, lipoic acid has been shown to control
the formation of AGE and reduce protein damage from glycation
in both humans and animals. This has proven to be of special
value in preventing and treating diabetic neuropathy, which is
believed to be due in part to glycation and protein oxidation
by glucose (glycoxidation). Lipoic acid has been an approved
treatment for this condition in Germany for 25 years. |