Cold Air And Wasabi Linked To Longer Lifespan In Worms, Study

Cool temperatures and the spicy condiment wasabi activate a protein that increases the lifespans of nematode worms, according to a new study.

AsianScientist (Feb. 18, 2013) – Scientists have known for nearly a century that cold-blooded animals, such as worms, flies, and fish all live longer in cold environments, but have not known exactly why.

The research, published recently in the journal Cell, has identified a genetic program that promotes longevity of roundworms in cold environments – and this genetic program also exists in warm-blooded animals, including humans.

“This raises the intriguing possibility that exposure to cold air – or pharmacological stimulation of the cold-sensitive genetic program – may promote longevity in mammals,” said Shawn Xu, faculty member at the University of Michigan Life Sciences Institute and the Bernard W. Agranoff Collegiate Professor in the Life Sciences at the U-M Medical School.

Scientists had long assumed that animals live longer in cold environments because of a passive thermodynamic process, reasoning that low temperatures reduce the rate of chemical reactions and thereby slow the rate of aging.

“But now, at least in roundworms, the extended lifespan observed at low temperature cannot be simply explained by a reduced rate of chemical reactions,” Xu said. “It’s, in fact, an active process that is regulated by genes.”

Xu found that cold air activates a receptor known as the TRPA1 channel, found in nerve and fat cells in nematodes, and TRPA1 then passes calcium into cells. The resulting chain of signaling ultimately reaches DAF-16/FOXO, a gene associated with longevity. Mutant worms that lacked TRPA1 had shorter life spans at lower temperatures.

Because the mechanisms identified by Xu and his collaborators also exist in a range of other organisms, including humans, the research suggests that a similar effect might be possible.

Researchers have known that lowering the core body temperature of warm-blooded animals, such as mice, by 0.9 degrees Fahrenheit can extend lifespan by 20 percent, but it hasn’t been practical for humans to attempt to lower the core body temperature, Xu said.

“But if some aspects of the aging process are initiated in skin and fat cells in humans as they are in nematodes, should we go out to embrace some cold air in the winter?” Xu said.

In addition to cool temperatures, the spicy condiment wasabi activates TRPA1 as well, and feeding wasabi to nematodes increases their life spans, said Xu.

“Maybe we should be going to sushi restaurants more often.”

The article can be found at: Xiao R et al. (2013) A Genetic Program Promotes C. elegans Longevity at Cold Temperatures via a Thermosensitive TRP Channel.

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Source: University of Michigan; Photo: geekstinkbreath/Flickr/CC.
Disclaimer: This article does not necessarily reflect the views of AsianScientist or its staff.

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