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Raf-MEK-Erk cascade in anoikis is controlled by Rac1 and Cdc42 via Akt.
Zugasti, O; Rul, W; Roux, P; Peyssonnaux, C; Eychene, A; Franke, T F; Fort, P; Hibner, U.
Affiliation
  • Zugasti O; Institut de Génétique Moléculaire, CNRS UMR5535, F-34293 Montpellier Cedex 5, France.
Mol Cell Biol ; 21(19): 6706-17, 2001 Oct.
Article in En | MEDLINE | ID: mdl-11533257
ABSTRACT
Signals from the extracellular matrix are essential for the survival of many cell types. Dominant-negative mutants of two members of Rho family GTPases, Rac1 and Cdc42, mimic the loss of anchorage in primary mouse fibroblasts and are potent inducers of apoptosis. This pathway of cell death requires the activation of both the p53 tumor suppressor and the extracellular signal-regulated mitogen-activated protein kinases (Erks). Here we characterize the proapoptotic Erk signal and show that it differs from the classically observed survival-promoting one by the intensity of the kinase activation. The disappearance of the GTP-bound forms of Rac1 and Cdc42 gives rise to proapoptotic, moderate activation of the Raf-MEK-Erk cascade via a signaling pathway involving the kinases phosphatidlyinositol 3-kinase and Akt. Moreover, concomitant activation of p53 and inhibition of Akt are both necessary and sufficient to signal anoikis in primary fibroblasts. Our data demonstrate that the GTPases of the Rho family control three major components of cellular signal transduction, namely, p53, Akt, and Erks, which collaborate in the induction of apoptosis due to the loss of anchorage.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Proto-Oncogene Proteins / Mitogen-Activated Protein Kinase 1 / Proto-Oncogene Proteins c-raf / Rho GTP-Binding Proteins / Mitogen-Activated Protein Kinases / Anoikis Limits: Animals Language: En Journal: Mol Cell Biol Year: 2001 Document type: Article

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Proto-Oncogene Proteins / Mitogen-Activated Protein Kinase 1 / Proto-Oncogene Proteins c-raf / Rho GTP-Binding Proteins / Mitogen-Activated Protein Kinases / Anoikis Limits: Animals Language: En Journal: Mol Cell Biol Year: 2001 Document type: Article