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Related Experiment Videos

A role for Rho in Ras transformation

R G Qiu1, J Chen, F McCormick

  • 1Onyx Pharmaceuticals, Richmond, CA 94806, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 5, 1995
PubMed
Summary

Rho GTPase signaling is crucial for cell transformation. While RhoA alone doesn't transform cells, it cooperates with oncogenic Ras and Raf pathways, impacting stress fiber formation and malignant transformation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Small GTP-binding proteins Rac and Rho regulate cell signaling pathways.
  • Rac controls lamellipodia formation, while Rho influences stress fibers.
  • Oncogenic Ras signaling is linked to cell transformation and cytoskeletal rearrangements.

Purpose of the Study:

  • To investigate the role of Rho GTPase in oncogenic Ras-mediated cell transformation.
  • To determine if RhoA cooperates with other signaling pathways in transformation.
  • To elucidate the specific pathways regulated by Rho involved in transformation.

Main Methods:

  • Expression of constitutively active and dominant-negative RhoA mutants in Rat 1 and NIH 3T3 fibroblasts.
  • Focus-formation assays to assess cell transformation.
  • Analysis of stress fiber formation in transfected cells.

Main Results:

  • Constitutively active RhoA (V14-RhoA) cooperates with RafCAAX in focus-formation assays.
  • Dominant-negative RhoA (N19-RhoA) inhibits focus formation induced by V12-H-Ras and RafCAAX.
  • Coexpression of N19-RhoA reverts Ras transformation and restores stress fiber formation.
  • RhoA drives separate pathways for stress fiber formation and Ras transformation.

Conclusions:

  • Rho GTPase plays a critical role in oncogenic Ras-driven cell transformation.
  • RhoA regulates at least two distinct pathways: one for stress fiber formation and another for transformation.
  • Targeting Rho signaling could be a therapeutic strategy for Ras-driven cancers.

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