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Cooperating oncogenes converge to regulate cyclin/cdk complexes

A C Lloyd1, F Obermüller, S Staddon

  • 1Imperial Cancer Research Fund (ICRF), London, UK.

Genes & Development
|March 1, 1997
PubMed
Summary
This summary is machine-generated.

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Oncogene cooperation drives synergistic cell transformation. Raf kinase activation halts cell cycle via p21(CiP1), but SV40 large T antigen or mutant p53 overrides this arrest, promoting proliferation by modulating cyclin/cdk activity.

Area of Science:

  • Cellular biology
  • Molecular oncology
  • Cancer research

Background:

  • Oncogene cooperation is crucial for synergistic cell transformation.
  • Understanding the molecular mechanisms of oncogene cooperation is key to cancer research.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying synergistic transformation of primary rat Schwann cells by cooperating oncogenes.
  • To elucidate the roles of Raf kinase, SV40 large T antigen (LT), and p53 in cell cycle regulation during transformation.

Main Methods:

  • Activation of an inducible Raf kinase in primary rat Schwann cells.
  • Coexpression of SV40 large T (LT) or a dominant-negative p53 mutant.
  • Analysis of cell cycle arrest, p21(CiP1) induction, and cyclin/cdk activity.

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Main Results:

  • Raf kinase activation induced cell cycle arrest at G1 by upregulating p21(CiP1), inhibiting cyclin/cdk activity.
  • SV40 LT or dominant-negative p53 abolished p21(CiP1) induction and growth arrest.
  • Raf and LT cooperated to increase cyclin A/cdk2 activity, stimulating proliferation independently of mitogens.

Conclusions:

  • Raf signaling converges with cooperating partners (LT, p53) at the regulation of cyclin/cdk complexes.
  • Cellular responses to Raf activation are modulated by p53 status.
  • This study reveals a critical interplay between oncogenes and cell cycle regulators in cancer development.