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Transformation by activated ras or fos prevents myogenesis by inhibiting expression of MyoD1

A B Lassar1, M J Thayer, R W Overell

  • 1Department of Genetics, Fred Hutchinson Cancer Research Center, Seattle, Washington 98104.

Cell
|August 25, 1989
PubMed

Insights

Activated ras oncogene blocks muscle cell differentiation by inhibiting key muscle regulatory factors like MyoD1 and myogenin. Restoring MyoD1 reinitiates the differentiation process in these transformed cells.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Myogenesis is a complex process involving muscle regulatory factors.
  • Oncogenes like ras can disrupt normal cellular functions, including differentiation.
  • Understanding oncogene-induced differentiation blockade is crucial for cancer research.

Purpose of the Study:

  • To investigate the mechanism by which activated ras oncogene inhibits myogenic differentiation.
  • To determine the role of muscle regulatory factors (MyoD1 and myogenin) in ras-mediated inhibition.
  • To explore the potential for MyoD1 re-expression to rescue differentiation in ras-transformed myoblasts.

Main Methods:

  • Ras transformation of myoblasts.
  • Analysis of muscle regulatory factor expression (MyoD1 and myogenin) via molecular techniques.
  • Retroviral expression of MyoD1 in transformed myoblasts.
  • Assessment of terminal differentiation and lineage markers.

Main Results:

  • Activated ras transformation of myoblasts inhibits myogenic differentiation.
  • Ras transformation leads to the downregulation of MyoD1 and myogenin expression.
  • Forced expression of MyoD1 in ras-transformed myoblasts restores terminal differentiation and lineage markers.
  • Fos transformation of myoblasts inhibits differentiation via a similar mechanism.

Conclusions:

  • Ras-mediated inhibition of myogenic differentiation is dependent on the loss of MyoD1 expression.
  • MyoD1 plays a critical role in overcoming ras-induced differentiation blockade.
  • The findings suggest a common mechanism of differentiation inhibition by oncogenes like ras and fos.

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