alexa HGF SF is present in normal adult skeletal muscle and is capable of activating satellite cells.
Physicaltherapy & Rehabilitation

Physicaltherapy & Rehabilitation

Journal of Sports Medicine & Doping Studies

Author(s): Tatsumi R, Anderson JE, Nevoret CJ, Halevy O, Allen RE

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Abstract We have shown that hepatocyte growth factor/scatter factor can stimulate activation and early division of adult satellite cells in culture, and that the action of hepatocyte growth factor/scatter factor is similar to the action of the unidentified satellite cell activator found in extracts of crushed muscle. We now provide new evidence that hepatocyte growth factor/scatter factor is present in uninjured adult rat skeletal muscle and that the activating factor in crushed muscle extract is hepatocyte growth factor/scatter factor. Immunoblots of crushed muscle extract demonstrate the presence of hepatocyte growth factor/scatter factor. Furthermore, crushed muscle extract stimulates the scattering of cultured MDCK cells. Immunolocalization studies with adult rat skeletal muscle show the presence of hepatocyte growth factor/scatter factor in the extracellular matrix surrounding muscle fibers; in addition, the receptor for hepatocyte growth factor/scatter factor, c-met, is localized to putative satellite cells. In muscle from mdx mice, hepatocyte growth factor/scatter factor and c-met are colocalized in activated satellite cells in regions of muscle repair. Moreover, the satellite cell-activating activity of crushed muscle extract is abolished by preincubation with anti-hepatocyte growth factor antibodies. Finally, direct injection of hepatocyte growth factor/scatter factor into uninjured tibialis anterior muscle of 12-month-old rats stimulated satellite cell activation. These experiments demonstrate that hepatocyte growth factor/scatter factor is present in muscle, can be released upon injury, and has the ability to activate quiescent satellite cells in vivo. Copyright 1998 Academic Press. This article was published in Dev Biol and referenced in Journal of Sports Medicine & Doping Studies

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