If cancer cells represent a kind of immortality (having lost their inability to die naturally), then it is not surprising that tumor suppressor proteins would be implicated in the opposite of immortality, aging toward natural death.  Recently, researchers at the Fox Chase Cancer Center in Philadelphia found not only that coincidence, but also strong indications that accumulation of the p16 tumor suppressor protein actually causes aging. In mice, they found that shutting off p16 reverses aging.            MIORE