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Suppression of c-Src activity stimulates muscle differentiation via p38 MAPK activation

Min Jin Lim1, Yong Hak Seo, Kyu Jin Choi

  • 1Department of Biochemistry and Molecular Biology (BK21 project), Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, School of Medicine, Kyung Hee University, Seoul 130-701, Republic of Korea.

Archives of Biochemistry and Biophysics
|July 7, 2007
PubMed

Insights

Suppression of c-Src kinase activity promotes muscle differentiation by activating p38 MAPK. This study clarifies the role of c-Src in myogenesis using cell line models.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The role of c-Src (a non-receptor tyrosine kinase) in muscle differentiation is complex and debated.
  • Understanding c-Src's precise function is crucial for elucidating mechanisms of myogenesis.

Purpose of the Study:

  • To investigate whether c-Src positively or negatively regulates muscle differentiation.
  • To determine the signaling pathways modulated by c-Src during myogenesis.

Main Methods:

  • Utilized H9c2 and C2C12 cell lines for muscle differentiation studies.
  • Employed pharmacologic inhibitors (PP1, SU6656) and dominant-negative c-Src expression to inhibit c-Src activity.
  • Analyzed the Raf/MEK/ERK and p38 MAPK signaling pathways.

Main Results:

  • Inhibition of c-Src induced muscle differentiation in proliferation medium.
  • c-Src activity decreased during differentiation; its inhibition suppressed Raf/MEK/ERK but activated p38 MAPK.
  • Concomitant inhibition of c-Src and p38 MAPK blocked differentiation.

Conclusions:

  • Suppression of c-Src activity stimulates muscle differentiation.
  • This stimulation is mediated, at least in part, by the activation of p38 MAPK.
  • c-Src acts as a negative regulator of muscle differentiation through the Raf/MEK/ERK pathway and its suppression allows p38 MAPK activation.

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