Rapamycin gave mTOR its name — mechanistic target of rapamycin,
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. Giving the drug might do what caloric restriction does without requiring superstrict diets (SN: 6/4/11, p. 22). Matt Kaeberlein,
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, a geroscientist at the University of Washington, and colleagues conducted a safety study of the drug last year in 24 dogs. The study was only 10 weeks long,
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, so the researchers can’t yet draw any conclusions about long-term effects on aging. But the dogs had no major side effects from taking low doses of the drug,
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, a worry because rapamycin impairs immune system function and could make animals (including people) who take it more vulnerable to infection or cancer.
Rapamycin’s drawbacks make it unattractive for human studies. The diabetes drug metformin may instead be the antiaging drug of choice for people, says gerontologist Nir Barzilai. In addition to mTOR,
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, metformin targets an insulin-like growth protein known as IGF-1. That protein has been implicated in a variety of biological processes that promote aging.
Barzilai, of Albert Einstein College of Medicine in New York City,
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, and researchers at more than a dozen centers around the country plan to test metformin for its ability to fight aging in people 65 to 79. Barzilai and colleagues laid out the case for using metformin in the June 14 Cell Metabolism. Metformin is generally safe, with few major side effects. It has been shown to improve a variety of health measures and to impair cancer development in people with type 2 diabetes (SN: 11/30/13, p. 18). Barzilai says the drug may help people who don’t have diabetes also live healthier when they are elderly. If it does,
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, commercials touting metformin might have to add another disclaimer,
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, he jokes. “The commercials will go on: ‘This will make you healthy, but we have to apologize because you might live longer.’?”

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