Category Archives: Longevity Medicine

A review paper: "The definition of sarcopenia continues to evolve, from an observational phenomenon to a differential diagnostic approach. Clinical relevance for sarcopenia is defined by a loss in lean muscle mass and impairment of functional status. A therapeutic approach to the loss of skeletal muscle mass and strength in older persons depends on correct classification. The term sarcopenia is reserved for age-related decline in muscle mass not attributable to the presence of proinflammatory cytokines. For persons with sarcopenia, the primary intervention should include resistance exercise. An improvement in muscle mass and strength has been demonstrated with resistance exercise, even in the very old. Targeting the hormonal changes with aging is an attractive intervention. However, testosterone replacement in elderly hypogonadal men has demonstrated only modest increases in muscle mass and strength. Administration of growth hormone in pharmacologic doses increases muscle mass but not muscle strength. Nutritional therapy is promising, but the effects in clinical trials have been small."

View the Article Under Discussion: http://www.ncbi.nlm.nih.gov/pubmed/20497850

Read More Longevity Meme Commentary: http://www.longevitymeme.org/news/

A brace of popular science books on gerontology and engineered longevity have been written in past years - one of the many signs that the field is growing in profile in the public eye, an important step on the way to obtaining funding for more rapid progress. Here the Village Voice notes an irreverent forthcoming addition to the portfolio. Per the article, we probably shouldn't take it seriously as anything but a sign of the times: "Along with the origin of life and the nature of consciousness, why and how we age is one of the weightiest questions out there. It's one Weiner tackles in his new book Long for This World, a brilliant and improbably funny look inside the mind-bending science of immortality ... These people are asking what makes us mortal. It's something everyone's curious about, whether they're scientists or not. ... Human life expectancy has doubled over the past 200 years, Weiner writes, thanks primarily to advancements in medicine. And while prominent gerontologists argue that we can expect another seven years fairly soon, the most fervent members of the field are gunning for the total eradication of death. Chief among the latter is Aubrey David Nicholas Jasper de Grey, Weiner's arch protagonist."

View the Article Under Discussion: http://www.villagevoice.com/2010-05-25/books/jonathan-weiner-follows-search-for-immortality/

Read More Longevity Meme Commentary: http://www.longevitymeme.org/news/

From Impact Aging earlier this year, an open access paper on some of the mechanics of hormesis: a little stress on your system improves longevity. "Oxidative stress constitutes the basis of physio-pathological situations such as neurodegenerative diseases and aging. However, sublethal exposure to toxic molecules such as reactive oxygen species can induce cellular responses that result in stress fitness. Studies in Schizosaccharomyces pombe have recently showed that the Sty1 MAP kinase, known to be activated by hydrogen peroxide and other cellular stressors, plays a pivotal role in promoting fitness and longevity when it becomes activated by calorie restriction, a situation which induces oxidative metabolism and reactive oxygen species production. Activation of the MAP kinase by calorie restriction during logarithmic growth induces a transcriptional anti-stress response including genes essential to promote lifespan extension. Importantly enough, the lifespan promotion exerted by deletion of the pka1 or sck2 genes, inactivating the two main nutrient-responsive pathways, is dependent on the presence of a functional Sty1 stress pathway, since double mutants also lacking Sty1 or its main substrate Atf1 do not display extended viability. ... We propose that moderate stress levels that are not harmful for cells can make them stronger."

View the Article Under Discussion: http://www.impactaging.com/papers/v2/n4/full/100133.html

Read More Longevity Meme Commentary: http://www.longevitymeme.org/news/

Some people do have better genes than others when it comes to a long life, though lifestyle choices do still seem to play a greater role. Here, researchers were looking to "determine whether offspring of parents with exceptional longevity (OPEL) have a lower rate of dementia than offspring of parents with usual survival (OPUS). ... [Participants were a] volunteer sample of 424 community-residing older adults without dementia aged 75 to 85 recruited from Bronx County starting in 1980 and followed for up to 23 years. ... Epidemiological, clinical, and neuropsychological assessments were completed every 12 to 18 months. OPEL were defined as having at least one parent who reached the age of at least 85. OPUS were those for whom neither parent reached the age of 85. ... The OPEL group had a lower incidence of Alzheimer's disease. After adjusting for sex, education, race, hypertension, myocardial infarction, diabetes mellitus, and stroke, results were essentially unchanged. OPEL also had a significantly lower rate of memory decline on the Selective Reminding Test (SRT) than OPUS. ... OPEL develop dementia and Alzheimer's disease at a significantly lower rate than OPUS. Demographic and medical confounders do not explain this result. Factors associated with longevity may protect against dementia and Alzheimer's disease."

View the Article Under Discussion: http://www.ncbi.nlm.nih.gov/pubmed/20487085

Read More Longevity Meme Commentary: http://www.longevitymeme.org/news/

Raised levels of heat shock proteins can protect against sarcopenia, age-related loss of muscle mass and strength: "HSP10 (Heat Shock Protein), helps monitor and organise protein interactions in the body, and responds to environmental stresses, such as exercise and infection, by increasing its production inside cells. Researchers [found] that excessive amounts of HSP10 inside mitochondria - 'organs' that act as energy generators in cells - can [preserve] muscle strength. ... We studied the role of HSP10 inside mitochondria, as it is here that unstable chemicals are produced which can harm parts of the cell. The damage caused by this is thought to play an important part in the ageing process, in which skeletal muscle becomes smaller and weaker and more susceptible to stress damage. In response to these stresses HSP10 increases its levels and helps cells resist damage and recover more effectively. Our research is the first to demonstrate that age-related loss of skeletal muscle mass is not inevitable." The article is sadly sensationalist, overhyping a slowing of muscle loss as "halting the aging process" when it is of course no such thing. It is unfortunate that university publicists feel the need to do this - it only makes them and the researchers they promote look foolish.

View the Article Under Discussion: http://www.physorg.com/news193913231.html

Read More Longevity Meme Commentary: http://www.longevitymeme.org/news/

Sulforaphane, an active compound extracted from broccoli, offers hope to breast cancer sufferers as it is capable of killing off cancer stem cells.

According to new research from the US, a compound found in the popular vegetable broccoli is capable of targeting and killing off cancer stem cells.  According to the research, which was published recently in the journal Clinical Cancer Research, the compound sulforaphane was capable of killing off cancer stem cells and prevented new cancerous growths from emerging.

Broccoli vs. cancerous tumors

Collating their data with other earlier studies on the subject, the US researchers noted that sulforaphane was able to reduce the resistance of cancerous tumors to conventional treatment.  Since the compound reduces tumor resistance, a second theory arose: the compound may be the key to solving the problem with relapses, or recurring cancer.

The researchers further noted that people who consumed more broccoli tend to have less risk of breast cancer.  Since the compound is derived naturally from the vegetable, it has very low toxicity and can be utilized by the body easily (high bioavailability).

Bioavailability is an important concept in medical treatments because if a drug has low bioavailability, it becomes less effective and the patient would eventually need to take higher doses of the drug to get the desired results.  To date, sulforaphane has already been marketed as a food supplement.  However, the amount of sulforaphane in supplements is not being regulated.

Broccoli vs. diabetes

It seems that like a few other organic compounds like resveratrol, sulforaphane is enjoying widespread popularity because it provides so many benefits.  In another study published in the medical journal Diabetes, it was found that the same compound may be helpful in reducing the vascular damage associated with long-term diabetes.

As you may know, diabetes causes a lot of problems to diabetics, including damage to blood vessels.  This damage to blood vessels may even cause blindness if the diabetes is not treated and monitored correctly.

Sulforaphane, according to the study in Diabetes, was capable of reducing the damage to body’s blood vessels by activating enzyme production.  The enzyme produced protects the blood vessels from the ravages of diabetes.

The compound also helped the body by helping produce enzymes that disabled free radicals in the body.  In yet another study, the compound offered hope to family lines with histories of cancer.

It appears that the compound was also capable of preventing cells from passing on damaged or corrupted genetic information to the next generation of cells.  In another study (this is the fourth!) sulforaphane was also linked to reducing the chances of aggressive prostate cancer in men by more than forty-five percent.

Sources:
mayoclinic.com
nutraingredients.com

Discuss this post in Frank Mangano’s forum!