Increased MAPK signaling during in vitro muscle wounding.
Regeneration of skeletal muscle upon injury is a complex process, involving activation of satellite cells, followed by migration, fusion, and regeneration of damaged myofibers. Previous work concerning the role of the mitogen activated protein (MAP) kinase signaling pathways in muscle injury comes primarily from studies using chemically induced wounding. The purpose of this study was to test the hypothesis that physical injury to skeletal muscle cells in vitro activates the MAP kinase signaling pathways. We demonstrate that extracellular signal regulated kinases (ERKs) 1, 2, and p38 are rapidly and transiently activated in response to injury in C2C12 cells, and are primarily localized to cells adjacent to the wound bed. Culture medium from wounded cells is able to stimulate activation of p38 but not ERK in unwounded cells. These results suggest that both ERK and p38 are involved in the response of muscle cells to physical injury in culture, and reflect what is seen in whole tissues in vivo.
Yeow
K
K
CNRS UMR 6548, Laboratoire de Physiologie Cellulaire et Moléculaire, Faculté des Sciences, Université de Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France.
Cabane
C
C
Turchi
L
L
Ponzio
G
G
Dérijard
B
B
D000818:Animals; D002478:Cells, Cultured; D003470:Culture Media; D004789:Enzyme Activation; D020935:MAP Kinase Signaling System / Q000502:physiology*; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D018482:Muscle, Skeletal / Q000293:injuries*; D010766:Phosphorylation; D013997:Time Factors; D014947:Wounds and Injuries / Q000473:pathology / Q000503:physiopathology*; D048051:p38 Mitogen-Activated Protein Kinases
D003470:Culture Media; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases