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Gene May Regulate Cellular Aging

ounger animals.' In mice with an excess of p16INK4a, 'islet cells aged prematurely; they stopped dividing early.' 'This suggests that if we could attenuate p16INK4a expression in some way in humans, it could lead to enhanced islet re-growth in adults and a possible new treatment for diabetes,' Sharpless said.

Similar results were found in the other studies, which focused on brain stem cells and blood stem cells.

The Michigan researchers, led by Dr. Sean Morrison, examined the role played by p16INK4a in neural stem cells, progenitor cells that can form new neurons and other brain cells. The team showed that p16INK4a increases markedly in those cells with aging. Moreover, p16INK4a -deficient neural stem cells work better and don't age to the same extent that wild-type (normal) stem cells do, Sharpless said.

Dr. Janakiraman Krishnamurthy, lead author of the UNC study and a postdoctoral scientist in the Sharpless lab, was a co-author of the Michigan report. The Harvard team, led by Dr. David Scadden, studied the role of p16INK4a in hematopoietic stem cells, which proliferate continuously during the adult lifespan and produce massive amounts of new blood cells on an hourly basis. Their results suggest that p16INK4a is the molecular basis for an old-age 'signal' previously observed in blood stem cells. The Harvard study also showed that blood stem cells from old mice lacking p16INK4a functioned better than old cells from wild-type mice, suggesting p16INK4a causes aging of these cells as well.

Sharpless cautions that any promise of a potential new aging treatment based on p16INK4a should include two important caveats. 'First, even though old mice lacking p16INK4a show enhanced stem cell function, they do not live longer. This is because p16INK4a is an important cancer-suppressor gene, and mice lacking p16INK4a develop more cancers than old, normal mice,' he said.

'Secondly, in all three studies, p16INK4a l
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