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Single adult stem cell can self renew, repair tissue damage in live mammal
Date:12/14/2008

lowing muscle stem cells from the transplanted animal, the scientists duplicated, or cloned, the cells in the lab. Like the original MuSC, the cloned copies were intact and capable of self-renewal.

"We are thrilled with the results," says Sacco. "It's been known that these satellite cells are crucial for the regeneration of muscle tissue, but this is the first demonstration of self-renewal of a single cell."

The ability to isolate and then transplant skeletal adult muscle stems cells could have a wide impact in treating not only a variety of muscle wasting diseases such as muscular dystrophy but also severe muscle injuries or loss of function from aging and disuse.

In other experiments, the researchers transplanted between 10 and 500 luciferase-tagged MuSC into the leg muscles of mice.

These cells also proliferated and engrafted, forming new myofibers and fusing with injured fibers.

Unlike tumor cells, the transplanted stem cells achieved homeostasis, growing to a stable, constant level and ceasing replication.

After demonstrating that the transplanted stem cells proliferated and fully restored the animal's lost function, Sacco and Blau recovered new stem cells from the transplant with full stem cell potency, meeting the final "gold standard" test for adult multipotent stem cells.


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Contact: Cathy Yarbrough
sciencematter@yahoo.com
858-243-1814
American Society for Cell Biology
Source:Eurekalert

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