It's premature to call the compound, alpha-ketoglutarate, an antiaging drug, but it has been found to extend the longevity of C. elegans by 50 percent

Caenorhabditis elegans treated with a -ketoglutarate displayed youthful vigour even after two weeks. Credit:Zeynep F. Altun via Wikimedia Commons

A compound available in some dietary supplements extends lifespan in the nematode worm Caenorhabditiselegansby interfering with cellular energy production and mimicking the effects of severe calorie restriction. The results, published online inNaturetoday, suggest that the compound, called -ketoglutarate, could provide a way to increase longevity.

Though intriguing, data linking the compound to longevity are limited to short-term studies in a worm and should not lead people to start taking -ketoglutarate supplements, cautions Matt Kaeberlein, who studies ageing at the University of Washington in Seattle. I'm not sure I would characterize -ketoglutarate as an anti-ageing drug yet, says Kaeberlein, who was not involved in the study. Its premature.

Power interruption Chemical biologist Jing Huang at the University of California in Los Angeles and her colleagues stumbled on -ketoglutarate while screening metabolites for the ability to improve lifespan inC. elegans. -ketoglutarate boosted longevity by about 50% over untreated controls.

Differences in behavior were also clear, says Huang: as untreated worms surpassed the age of two weeks, they became sluggish. They move their head if you poke them, she says, but otherwise theres not much activity. Treated nematodes, however, wriggled and squirmed with youthful vigor.

-Ketoglutarate is a component of a metabolic pathway called the tricarboxylic acid cycle, which is part of cells' energy-generating machinery. Huang and her colleagues found that -ketoglutarate can also inhibit a crucial enzyme called ATP synthase. That enzyme is the main producer of ATP, the chemical energy currency in cells, and so reduces energy production in the body.

Huang and her colleagues reasoned that the interruption in energy production could mimic the effects of diets very low in calories, which have beenshown to extend lifespan in some animals.To back up this notion, they also showed that calorie restriction raised levels of -ketoglutarate.

Calorie counter Calorie restriction had no added effect on longevity in worms given -ketoglutarate, suggesting that the metabolite is a key part of the mechanism by which low-calorie diets aid longevity. If this is so, the findings hint at a way to gain the benefits of calorie restriction without the suffering. Only a dedicated few are able to withstand the rigors of such dietary deprivation.

But while the results are promising, researchers need to pursue longer-term studies in animals that more closely resemble humans to fully understand -ketoglutarates potential, cautions Brian Kennedy, president of the Buck Institute for Research on Aging in Novato, California. We dont just want to make the animals live longer, he adds. We want to make them healthy longer.

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Lifespan Boosted in Worms via Dietary Supplement Compound