Cited by 683Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesMelanoma and MAPK Pathways

Activation of Rac1, RhoA, and mitogen-activated protein kinases is required for Ras transformation

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Khosravi-Far, Roya, Solski, Patricia A., Clark, Geoffrey J., Kinch, Michael S., Der, Channing J.·1995·Molecular and Cellular Biology

Abstract

Although substantial evidence supports a critical role for the activation of Raf-1 and mitogen-activated protein kinases (MAPKs) in oncogenic Ras-mediated transformation, recent evidence suggests that Ras may activate a second signaling pathway which involves the Ras-related proteins Rac1 and RhoA. Consequently, we used three complementary approaches to determine the contribution of Rac1 and RhoA function to oncogenic Ras-mediated transformation. First, whereas constitutively activated mutants of Rac1 and RhoA showed very weak transforming activity when transfected alone, their coexpression with a weakly transforming Raf-1 mutant caused a greater than 35-fold enhancement of transforming activity. Second, we observed that coexpression of dominant negative mutants of Rac1 and RhoA reduced oncogenic Ras transforming activity. Third, activated Rac1 and RhoA further enhanced oncogenic Ras-triggered morphologic transformation, as well as growth in soft agar and cell motility. Finally, we also observed that kinase-deficient MAPKs inhibited Ras transformation. Taken together, these data support the possibility that oncogenic Ras activation of Rac1 and RhoA, coupled with activation of the Raf/MAPK pathway, is required to trigger the full morphogenic and mitogenic consequences of oncogenic Ras transformation.

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Crossref · 10.1128/mcb.15.11.6443

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Authors
Khosravi-Far, R., Solski, P. A., Clark, G. J., Kinch, M. S., & Der, C. J.
Affiliations
  • Departments of Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
  • University of North Carolina at Chapel Hill (US)
Venue
Molecular and Cellular Biology
Published
1995-11-01
Volume
15
Issue
11
Pages
6443-6453
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2146055738
Cited by
683
References
54
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 9 · 2022: 5 · 2021: 7 · 2020: 8 · 2019: 19 · 2018: 8 · 2017: 7 · 2016: 8 · 2015: 11 · 2014: 13 · 2013: 16 · 2012: 9
FWCI
20.59
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • UNC Libraries
Funders
  • National Science Foundation
  • National Institutes of Health (7r01ca055008-03, 5r01ca042978-30, 5r01ca052072-05)
  • National Cancer Institute (CA42978, CA 55008, CA52072)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
Keywords
oncogenic Ras, Ras transformation, Rac1, RhoA, mitogen-activated protein kinase, Raf-1, MAPK/ERK pathway, morphological transformation, cell motility, soft agar growth, dominant-negative mutant, signal transduction
MeSH terms
Animals, Cell Division, Cell Movement, Cell Transformation, Neoplastic, Cytoskeleton, Enzyme Activation, Genes, Dominant, Humans, Proto-Oncogene Proteins, Signal Transduction, Proto-Oncogene Proteins p21(ras), 3T3 Cells, Protein Serine-Threonine Kinases, Point Mutation, Calcium-Calmodulin-Dependent Protein Kinases, GTP-Binding Proteins, Proto-Oncogene Proteins c-raf, rhoA GTP-Binding Protein, rac GTP-Binding Proteins, Mice

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