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Gladstone scientists discover novel mechanism by which calorie restriction influences longevity
Date:12/6/2012

t Gladstone and is also a professor at the University of California, San Francisco, with which Gladstone is affiliated. "Here, we find that βOHBthe body's major source of energy during exercise or fastingblocks a class of enzymes that would otherwise promote oxidative stress, thus protecting cells from aging."

Oxidative stress occurs as cells use oxygen to produce energy, but this activity also releases other potentially toxic molecules, known as free radicals. As cells age, they become less effective in clearing these free radicalsleading to cell damage, oxidative stress and the effects of aging.

However, Dr. Verdin and his team found that βOHB might actually help delay this process. In a series of laboratory experimentsfirst in human cells in a dish and then in tissues taken from micethe team monitored the biochemical changes that occur when βOHB is administered during a chronic calorie-restricted diet. The researchers found that calorie restriction spurs βOHB production, which blocked the activity of a class of enzymes called histone deacetylases, or HDACs.

Normally HDACs keep a pair of genes, called Foxo3a and Mt2, switched off. But increased levels of βOHB block the HDACs from doing so, which by default activates the two genes. Once activated, these genes kick-start a process that helps cells resist oxidative stress. This discovery not only identifies a novel signaling role for βOHB, but it could also represent a way to slow the detrimental effects of aging in all cells of the body.

"This breakthrough also greatly advances our understanding of the underlying mechanism behind HDACs, which had already been known to be involved in aging and neurological disease," said Gladstone Investigator Katerina Akassoglou, PhD, an expert in neurological diseases and one of the paper's co-authors. "The findings could be relevant for a wide range of neurological conditions, such as Alzheimer's, Parkinson's, aut
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Contact: Anne Holden
anne.holden@gladstone.ucsf.edu
415-734-2534
Gladstone Institutes
Source:Eurekalert  

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