Cited by 533Protein Kinase Regulation and GTPase SignalingCellular Mechanics and InteractionsCellular transport and secretion

A role for Rho in Ras transformation

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Qiu, R G, Chen, J, McCormick, F, Symons, M·1995·Proceedings of the National Academy of Sciences

Abstract

The small GTP-binding proteins Rac and Rho are key elements in the signal-transduction pathways respectively controlling the formation of lamellipodia and stress fibers induced by growth factors or oncogenic Ras. We recently reported that Rac function is necessary for Ras transformation and that expression of constitutively activated Rac1 is sufficient to cause malignant transformation. We now show that, although expression of constitutively activated V14-RhoA in Rat 1 fibroblasts does not cause transformation on its own, it strongly cooperates with constitutively active RafCAAX in focus-formation assays in NIH 3T3 cells. Furthermore, dominant-negative N19-RhoA inhibits focus formation by V12-H-Ras and RafCAAX in NIH 3T3 cells, and stable coexpression of N19-RhoA and V12-H-Ras in Rat1 fibroblasts reverts Ras transformation. Interestingly, stress fiber formation is inhibited in V12-H-Ras lines and restored by coexpression of N19-RhoA. We conclude that Rho drives at least two separate pathways, one that induces stress fiber formation and another one that is important for transformation by oncogenic Ras.

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Crossref · 10.1073/pnas.92.25.11781

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Authors
Qiu, R. G., Chen, J., McCormick, F., & Symons, M.
Affiliations
Onyx Pharmaceuticals, Richmond, CA 94806, USA.
Venue
Proceedings of the National Academy of Sciences
Published
1995-12-05
Volume
92
Issue
25
Pages
11781-11785
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2058795586
Cited by
533
References
45
Citations by year
2026: 2 · 2025: 2 · 2024: 1 · 2023: 6 · 2022: 2 · 2021: 6 · 2020: 5 · 2019: 7 · 2018: 5 · 2017: 4 · 2016: 7 · 2015: 9 · 2014: 6 · 2013: 12 · 2012: 11
FWCI
14.14
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
RhoA, Ras transformation, oncogenic Ras, small GTPases, stress fiber formation, lamellipodia, Raf, dominant-negative RhoA, focus formation, malignant transformation, signal transduction
MeSH terms
Amino Acid Sequence, Animals, Cell Division, Cell Transformation, Neoplastic, Cells, Cultured, Cytoskeleton, Fluorescent Antibody Technique, Models, Biological, Molecular Sequence Data, Transferases, Signal Transduction, ras Proteins, GTP-Binding Proteins, Alkyl and Aryl Transferases, rhoA GTP-Binding Protein, Rats

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