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Adult stem cells use special pathways to repair damaged muscle, MU researchers find
Date:12/1/2011

COLUMBIA, Mo. When a muscle is damaged, dormant adult stem cells called satellite cells are signaled to "wake up" and contribute to repairing the muscle. University of Missouri researchers recently found how even distant satellite cells could help with the repair, and are now learning how the stem cells travel within the tissue. This knowledge could ultimately help doctors more effectively treat muscle disorders such as muscular dystrophy, in which the muscle is easily damaged and the patient's satellite cells have lost the ability to repair.

"When your muscles are injured, they send out a 'mayday' for satellite cells to come and fix them, and those cells know where to go to make more muscle cells, and eventually new muscle tissue," said D Cornelison, an associate professor of biological sciences in the College of Arts and Science and a researcher in the Bond Life Sciences Center. "There is currently no effective satellite cell-based therapy for muscular dystrophy in humans. One problem with current treatments is that it requires 100 stem cell injections per square centimeter, and up to 4,000 injections in a single muscle for the patient, because the stem cells don't seem to be able to spread out very far. If we can learn how normal, healthy satellite cells are able to travel around in the muscles, clinical researchers might use that information to change how injected cells act and improve the efficiency of the treatment."

In a new study, researchers in Cornelison's lab used time-lapse microscopy to follow the movement of the satellite cells over narrow "stripes" of different proteins painted onto the glass slide. The researchers found that several versions of a protein called ephrin had the same effect on satellite cells: the cells that touch stripes made of ephrin immediately turn around and travel in a new direction.

"The stem cell movement is similar to the way a person would act if asked to walk blindfolded down a hallway. They
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Contact: Steven Adams
AdamsST@missouri.edu
573-882-8353
University of Missouri-Columbia
Source:Eurekalert  

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