Nation & World

<< Previous   of   Next >>   ADVERTISEMENT   CONTACT THE HERALD Do you have a news tip? newstips@heraldnet.com | 425.339.3400   Published: Sunday, November 30, 2008 Scientists find key step in work to reverse aging Los Angeles Times Researchers believe they have identified a fundamental cause of aging, according to a study published this week in the journal Cell. The aging mechanism was previously found in fungus and has now been discovered in mice. It's likely that the same process applies to humans, said the authors of the research, from Harvard. The study found that DNA damage, which accrues as we age, decreases a cell's ability to regulate which genes are turned on and off in particular settings. Although DNA damage speeds up aging, the actual cause is not the DNA damage but the lack of gene regulation. However, this lack of gene regulation, called "epigenetics," might be reversible. The study focused on a group of genes called "sirtuins" that are involved in the aging process. Sirtuins respond to DNA damage to repair it but appear to become overwhelmed as DNA damage accumulates during aging. When DNA damage accumulates, the sirtuins became too distracted to regulate gene activity properly. This was found in yeast about 10 years ago. The new study shows it also occurs in mice. But when stimulated by either the chemical in red wine, resveratrol, or by caloric restriction, sirtuins appear to function better. In the study, researchers administered extra copies of the sirtuin gene or fed resveratrol to mice. That extended their life span by 24 percent to 46 percent. "We see here, through a proof-of-principle demonstration, that elements of aging can be reversed," one of the researchers, Philipp Oberdoerffer, said. READER COMMENTS Be the first to comment. You must be a registered user and verify your e-mail address to post comments to blogs or articles on HeraldNet. To register, click here. To read other terms and conditions, click here. Log out

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