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Cell. 1997 Feb 21;88(4):521-30.

Suppression of integrin activation: a novel function of a Ras/Raf-initiated MAP kinase pathway.

Author information

1
Department of Vascular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.

Abstract

Rapid modulation of ligand binding affinity ("activation") is a central property of the integrin cell adhesion receptors. Using a screen for suppressors of integrin activation, we identified the small GTP-binding protein, H-Ras, and its effector kinase, Raf-1, as negative regulators of integrin activation. H-Ras inhibited the activation of integrins with three distinct alpha and beta subunit cytoplasmic domains. Suppression was not associated with integrin phosphorylation and was independent of both mRNA transcription and protein synthesis. Furthermore, suppression correlated with activation of the ERK MAP kinase pathway. Thus, regulation of integrin affinity state is a novel, transcription-independent function of a Ras-linked MAP kinase pathway that may mediate a negative feedback loop in integrin function.

PMID:
9038343
DOI:
10.1016/s0092-8674(00)81892-9
[Indexed for MEDLINE]
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