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A Signaling Pathway from the α5β1 and αvβ3 Integrins That Elevatesbcl-2 Transcription

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Matter, Michelle L., Ruoslahti, Erkki·2001·Journal of Biological Chemistry

Abstract

Integrin-mediated cell adhesion is necessary for the survival of many cell types, and loss of adhesion causes apoptosis. We have previously shown that the alpha5beta1 integrin supports cell survival on fibronectin and increases Bcl-2 protein expression. Here we show that bcl-2 transcription is elevated in cells that attach to fibronectin through alpha(v)beta1 or to vitronectin through alpha(v)beta3 but is not elevated in cells attaching through the alpha(v)beta1 integrin. Bcl-2 protein expression and protection from apoptosis under serum-free conditions correlated with bcl-2 transcription. This integrin-mediated regulation of bcl-2 is Shc- and FAK-dependent, and activation of Ras by FAK is required. Furthermore, Ras mediates this up-regulation of bcl-2 by activating the phosphatidylinositol 3-kinase-AKT pathway. Mitogen-activated protein kinase did not appear to be necessary for the activation of bcl-2 transcription. Therefore, our work characterizes the pathway that mediates the effect of integrins on bcl-2 transcription and cell survival.

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Metadata

Authors
Matter, M. L., & Ruoslahti, E.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-07
Volume
276
Issue
30
Pages
27757-27763
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1494507441
Cited by
244
References
4
FWCI
8.18
Type
journal article
Language
en
Open access
hybrid

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Matter, M. L., & Ruoslahti, E. (2001). A Signaling Pathway from the α5β1 and αvβ3 Integrins That Elevatesbcl-2 Transcription. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m102014200

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