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Agent slows aging in mice

ANN ARBOR, Mich. -- Aspirin didnt pan out. Neither did two other potential anti-aging agents. But a synthetic derivative of a pungent desert shrub is now a front- runner in ongoing animal experiments to find out if certain chemicals, known to inhibit inflammation, cancer and other destructive processes, can boost the odds of living longer.

Today at the annual meeting of the American Aging Association, University of Michigan scientist Richard A. Miller reports early results from a mouse study his lab and two others are conducting for the National Institute on Aging. The study, now in its fourth year, will test as many as two dozen possible anti-aging agents in animals in the next five years. The other centers are the University of Texas Health Science Center in San Antonio, Texas, and the Jackson Laboratory in Bar Harbor, Maine.

The scientists were surprised to find so quickly that one agent showed promise: NDGA, a compound derived from creosote bushes. These common North American desert shrubs have been traditionally used by Native Americans as healing remedies.

The preliminary results, to be published in August in the journal Aging Cell, show that male mice fed a normal diet and NDGA so far have survived in significantly greater numbers than mice on a normal diet. Scientists measured the difference at a point called median lifespan, when half the control mice had died of natural causes associated with aging.

This is the first time to my knowledge when an agent has been shown to extend median life span in three laboratories, says Miller, professor of pathology at the U-M Medical School and associate director of the U-M Geriatrics Center. Miller is also a research scientist at the Ann Arbor VA Medical Center.

No significant difference occurred in female mice. The scientists cant explain why at this point. We dont know how NDGA is having its effect on survival in this first analysis, Miller says.

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Contact: Anne Rueter
arueter@umich.edu
734-764-2220
University of Michigan Health System
1-Jun-2007


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