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Anti-Aging Drug Closer to Reality
Date:10/1/2009

Scientists extend lifespan of female mice and thwart diseases of old age in both sexes

THURSDAY, Oct. 1 (HealthDay News) -- In a possible advance toward a treatment for aging in people, researchers report that by genetically modifying mice, they reduced their susceptibility to age-related disease and expanded the lifespan of female mice by 19 percent.

Scientists have known for decades that taking in fewer calories can extend lifespan in some animals, but they have yet to figure out why that is so. In this new study, published in the Oct. 2 issue of Science, researchers manipulated mouse genes so they wouldn't produce a protein known as S6K1, thereby mimicking the effects of a strict diet.

No one knows if trying something similar in humans would slow their aging, and male mice didn't gain a longer lifespan. But researchers are hopeful, especially since the mice seemed to suffer no ill effects.

The mice were "in general, happier and healthier. We added life to their years as well as years to their lives," said study co-author Dr. Dominic J. Withers, a professor at University College London in England.

In essence, he explained, researchers have found a "mechanism" connected to the benefits of eating little that could be manipulated by existing medications. "We are therefore closer to treatments for aging and age-related diseases," he said.

At issue is finding a way to replicate the benefits of a severely restricted diet. But, keeping extremely tight control on eating can be "arduous" on a long-term basis, Withers acknowledged.

Female mice lived for an average of 950 days, 19 percent longer than usual, were skinnier and had stronger bones. They appeared to be better protected against type 2 diabetes and also appeared to be smarter: They were more "inquisitive and exploratory," Withers noted.

"Even their T cells, an important part of the immune system, appeared more '
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