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Yahoo! My Yahoo! Mail Yahoo! Search Search: Sign InNew User? Sign Up News Home - Help Navigation Primary Navigation Home Singapore Asia Pacific World Business Entertainment Sports Technology Top Stories Most Popular Secondary Navigation Search Search: Easter Island drug makes Methuselah mice AFP - Thursday, July 9 PARIS (AFP) - - A compound found in the soil of Easter Island stunningly boosts the lifespan of mice, enabling some to live more than 100 years old in human terms, researchers reported on Wednesday. ADVERTISEMENT The remarkable molecule, a bacterial byproduct discovered in a sample taken from the remote Pacific archipelago in the 1970s, is called rapamycin, after the island's Polynesian name of Rapa Nui. Rapamycin first came to light because of its qualities as a fungus fighter. It was later used to prevent organ rejection in transplant patients and then became incorporated into "stents" -- implants used to keep arteries open in patients with coronary disease. It is now in clinical trials for cancer treatment. The latest step in this remarkable odyssey is the vision that rapamycin, or something like it, may one day massively boost human life expectancy. "I've been in ageing research for 35 years and there have been many so-called anti-ageing interventions over those years that were never successful," said Arlan Richardson, director of the Barshop Institute, one of three centres that carried out the experiments. "I never thought we could find an anti-ageing pill for people in my lifetime. However, rapamycin shows a great deal of promise to do just that." Intrigued by findings that suggest rampamycin inhibits an enzyme linked to ageing in invertebrates, the researchers decided to add the drug to the diet of older mice. The rodents were 20 months old at the time, which in human terms is equivalent to around 60 years of age. Female mice with rapamycin added to their food lived 13 percent longer on average compared with non-rapamycin counterparts. Males which were fed the drug gained nine percent in their lifetime. The change was even more striking among the 10 percent of mice that lived longest. Within this group, rapamycin females lived 38 percent longer and rapamycin males 28 percent longer than non-rapamycin counterparts. Rapamycin may retard ageing processes or the onset of cancer but has no impact on the causes of death itself, the study adds. The project, reported in the British science journal Nature, is part of a test programme under the US National Institute on Ageing (NIA), which is looking for drugs that will help people remain healthy and active throughout their lives. Previous work on rapamycin longevity was carried out on yeast, worms and flies. This study is the first to show it also appears to work on mammals. Scientists have already found that by keeping mice skinny by restricting their diet, they could make the rodents live longer. The theory behind rapamycin is that it works on the same molecular mechanisms as calorie restriction. Initially, the US researchers hoped to start giving rapamycin to mice from four months of age. But the project was hit by delays in formulating the drug so that it could enter the specially-bred animals' bloodstream more effectively. As a result, the experiment was not started until the mice were 20 months old, but the team decided to press ahead anyway. "Most reports indicate that calorie restriction doesn't work when implemented in old animals," said Richardson. "The fact that rapamycin increases lifespan in relatively old mice was totally unexpected." In a commentary also published by Nature, University of Washington biocehmists Matt Kaeberlein and Brian Kennedy cautioned middle-aged people against rushing to take rapamycin, given that the drug is known to suppress the immune system, which fights invading microbes. Despite the rush of optimism sparked by rapamycin, "extending human lifespan with a pill remains the purview of science-fiction writers for now," they said. Email Story IM Story Printable View Blog This Sign in to recommend this article » 0 users recommend Enlarge Photo A boy dives into the water during the summer season in Easter Island, in 2005. A compound found in the soil of Easter Island stunningly boosts the lifespan of mice, enabling some to live more than 100 years old in human terms, researchers reported on Wednesday. Most Popular – Top Stories Viewed Jackson 'best father' ever, daughter tells the world Jackson mother relieved of estate on funeral eve Miniskirts, cleavage upset male SKoreans: survey World's oldest surviving Bible published online Grown-up Harry Potter stars at premiere of sixth film View Complete List » Search: Home Singapore Asia Pacific World Business Entertainment Sports Technology Top Stories Most Popular Copyright © 2009 Yahoo! Southeast Asia Pte Ltd. (Co. Reg. No. 199700735D). All Rights Reserved. Privacy Policy - Terms of Service - Community - Intellectual Property Rights Policy - Help

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