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Extracellular signal-regulated kinase 1/2 mitogen-activated protein kinase pathway is involved in myostatin-regulated

Wei Yang1, Yan Chen, Yong Zhang

  • 1National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100-005, P.R. China.

Cancer Research
|February 3, 2006
PubMed

Insights

Myostatin negatively regulates muscle cell growth by activating the Erk1/2 MAPK pathway. This pathway, involving Ras and ActRIIb, is crucial for myostatin

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Muscle Development

Background:

  • Transforming growth factor beta (TGF-beta) superfamily cytokines regulate tumorigenesis and cellular events.
  • Myostatin, a TGF-beta superfamily member, inhibits cell proliferation and differentiation.

Purpose of the Study:

  • To investigate the role of the extracellular signal-regulated kinase 1/2 (Erk1/2) mitogen-activated protein kinase (MAPK) pathway in myostatin signaling.
  • To elucidate the upstream regulators and downstream effects of myostatin-induced Erk1/2 activation in muscle cells.

Main Methods:

  • Utilized C2C12 myoblasts to study myostatin's effects on Erk1/2 activation and myogenic differentiation.
  • Employed dominant-negative Ras and MEK1 inhibitor (PD98059) to assess pathway involvement.
  • Used small interfering RNAs (siRNAs) and dominant-negative Activin receptor type IIb (ActRIIb) to investigate receptor function.

Main Results:

  • Myostatin rapidly activated the Erk1/2 cascade in C2C12 myoblasts, with greater activation in differentiating cells.
  • Ras was identified as an upstream regulator of myostatin-induced Erk1/2 activation and proliferation inhibition.
  • Myostatin-suppressed myotube fusion and differentiation were rescued by blocking the Erk1/2 MAPK pathway.
  • ActRIIb knockdown prevented myostatin-induced Erk1/2 phosphorylation and differentiation suppression, confirming its necessity.

Conclusions:

  • The Erk1/2 MAPK pathway is a key mediator of myostatin's negative regulatory effects on muscle cell growth and differentiation.
  • ActRIIb is essential for myostatin signaling, including Erk1/2 activation and inhibition of myogenic differentiation.

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