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Functioning of aged brains and muscles in mice made younger
Date:5/4/2014

agile when young, and these two unusually exciting papers actually point to a possible answer: the higher levels of the protein GDF11 we have when young. There seems to be little question that, at least in animals, GDF11 has an amazing capacity to restore aging muscle and brain function," he said.

Melton, Harvard's Xander University Professor continued, saying that the ongoing collaboration between Wagers, a stem cell biologist whose focus has been on muscle, Rubin, whose focus is on neurodegenerative diseases and using patient generated stem cells as targets for drug discover, and Lee, a practicing cardiologist and researcher, "is a perfect example of the power of the Harvard Stem Cell Institute as an engine of truly collaborative efforts and discovery, bringing together people with big, unique ideas and expertise in different biological areas."

As Melton noted, GDF11 is naturally found in much higher concentration in young mice than in older mice, and raising its levels in the older mice has improved the function of every organ system thus far studied.

Wagers first began using the parabiotic system in mice 14 years ago as a post doctoral fellow at Stanford University, when she and colleagues Thomas Rando, of Stanford, Irina Conboy, of UC Berkley, and Irving Weissman, of Stanford, observed that the blood of young mice circulating in old mice seemed to have some rejuvenating effects on muscle repair after injury.

Last year she and Richard Lee published a paper in which they reported that when exposed to the blood of young mice, the enlarged, weakened hearts of older mice returned to a more youthful size, and their function improved. And then working with a Colorado firm, the pair reported that GDF11 was the factor in the blood apparently responsible for the rejuvenating effect. That finding has raised hopes that GDF11 may prove, in some form, to be a possible treatment for diastolic heart failure, a fatal condition in the elderly that
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Contact: B. D. Colen
bd_colen@harvard.edu
617-413-1224
Harvard University
Source:Eurekalert  

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