Cited by 223Protein Kinase Regulation and GTPase SignalingPI3K/AKT/mTOR signaling in cancerCellular transport and secretion

R-Ras can activate the phosphoinositide 3-kinase but not the MAP kinase arm of the Ras effector pathways

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Marte, Barbara M., Rodriguez-Viciana, Pablo, Wennström, Stefan, Warne, Patricia H., Downward, Julian·1997·Current Biology

Abstract

Background The small GTPase R-Ras displays a less potent transforming activity than the closely related Ras oncogene products. Although R-Ras has been reported to interact with c-Raf1 and Ral-GDS in vitro, the pathways by which it exerts its effects on cellular proliferation are not known.Results Both Ras and R-Ras interact with phosphoinositide (PI) 3-kinase in vitro, and induce elevation of the levels of PI 3-kinase lipid products in intact cells. Unlike Ras, R-Ras does not activate Raf or mitogen-activated protein (MAP) kinase in cells. In co-transfection assays, the serine/threonine protein kinase PKB (or Akt) is effectively stimulated by R-Ras, Ras, mutants of Ras that activate PI 3-kinase but not other effectors, and activated forms of PI 3-kinase. Ras and R-Ras stimulate PKB/Akt through a non-autocrine mechanism that involves PI 3-kinase. The constitutive activation of PI 3-kinase alone is sufficient to activate PKB/Akt, but not the MAP kinase ERK or the stress-activated protein kinase, Jun N-terminal kinase. Transformation assays in fibroblasts suggest that PKB/Akt and Raf are part of distinct oncogenic signalling pathways.Conclusions Both the Raf-MAP kinase and PI 3-kinase-PKB/Akt pathways are activated by Ras, but only the PI 3-kinase-PKB/Akt pathway is activated by R-Ras. PI 3-kinase, and downstream targets such as PKB/Akt, are likely to be essential mediators of transformation induced by R-Ras. PI 3-kinase, as well as Raf, is thus implicated also in Ras transformation.

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Crossref · 10.1016/s0960-9822(06)00028-5

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Authors
Marte, B. M., Rodriguez-Viciana, P., Wennström, S., Warne, P. H., & Downward, J.
Corresponding author
Downward, Julian
Venue
Current Biology
Publisher
Elsevier BV
Published
1997-01
Volume
7
Issue
1
Pages
63-71
ISSN
0960-9822 (ISSN-L)
OpenAlex
W2074830772
Cited by
223
References
55
Citations by year
2026: 3 · 2024: 6 · 2023: 2 · 2022: 2 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 4 · 2017: 5 · 2016: 2 · 2015: 2 · 2014: 7 · 2013: 4 · 2012: 4
FWCI
9.60
Type
journal article
Language
en
Open access
Locations
  • Current Biology (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
National Institutes of Health
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 › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
R-Ras, oncogenic Ras, phosphatidylinositol 3-kinase, Akt, Ras transformation, oncogenic signalling pathways, ERK, JNK, fibroblast transformation
MeSH terms
Animals, Cell Transformation, Neoplastic, Enzyme Activation, Gene Expression Regulation, Neoplastic, Phosphotransferases (Alcohol Group Acceptor), Calcium-Calmodulin-Dependent Protein Kinases, ras Proteins, Phosphatidylinositol 3-Kinases, GTP Phosphohydrolases, Mice

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