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Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement
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Oncostatin M inhibits myoblast differentiation and regulates muscle regeneration

Fang Xiao1, Haixia Wang, Xinrong Fu

  • 1Department of Biochemistry, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Cell Research
|October 20, 2010
PubMed

Insights

Oncostatin M (OSM) inhibits muscle stem cell differentiation by activating the JAK/STAT pathway. This cytokine is induced by injury but must decrease for proper muscle regeneration.

Area of Science:

  • Cell Biology
  • Immunology
  • Muscle Physiology

Background:

  • Oncostatin M (OSM) is an interleukin-6 family cytokine involved in inflammation.
  • The role of OSM in myoblast differentiation and muscle regeneration is not well understood.

Purpose of the Study:

  • To investigate the function of OSM in myoblast differentiation and muscle regeneration.

Main Methods:

  • Investigated OSM's effects on myoblast differentiation.
  • Analyzed the JAK/STAT signaling pathway activation.
  • Examined the expression of key muscle regulatory factors (MEF2A, Id1, Id2, MyoD).
  • Assessed OSM's role in a mouse model of muscle injury.

Main Results:

  • OSM significantly inhibited myoblast differentiation via JAK1/STAT1/STAT3 activation.
  • OSM downregulated MEF2A and inhibited MyoD and MEF2 transcriptional activity.
  • OSM induced a positive feedback loop by upregulating STAT3 and its receptor.
  • STAT1 directly repressed MEF2 transcriptional activity.
  • OSM expression peaked post-injury and declined before differentiation, with prolonged expression impairing regeneration.

Conclusions:

  • OSM acts as a negative regulator of myoblast differentiation.
  • OSM prevents premature myoblast differentiation during early muscle regeneration.
  • OSM signaling is crucial for the temporal control of muscle repair.

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