From The Daily Galaxy...
A discovery by Stanford University Medical School researchers contradicts the prevailing theory that aging is a buildup of tissue damage similar to rust. The Stanford findings suggest specific genetic instructions drive the process. If they are right, science might one day find ways of switching the signals off and halting or even reversing aging.
“Everyone has assumed we age by rust,” Kim said. “But then how do you explain animals that don’t age?”
Some tortoises lay eggs at the age of 100, he points out. There are whales that live to be 200, and clams that make it past 400. The chemistry of the wear-and-tear process, including damage from oxygen free-radicals, should be the same in all cells, which makes it hard to explain why species have dramatically different life spans. “A free radical doesn’t care if it’s in a human cell or a worm cell,” Kim said.
If aging is not a cost of unavoidable chemistry but is instead driven by changes in regulatory genes, the aging process may not be inevitable. It is at least theoretically possible to slow down or stop developmental drift.
“The take-home message is that aging can be slowed and managed by manipulating signaling circuits within cells,” said Marc Tatar, PhD, a professor of biology and medicine at Brown University who was not involved in the research. “This is a new and potentially powerful circuit that has just been discovered for doing that.”
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