beta-Arrestin 1 and Galphaq/11 coordinately activate RhoA and stress fiber formation following receptor stimulation.

Journal Article (Journal Article)

beta-Arrestins were initially shown, in conjunction with G protein-coupled receptor kinases, to be involved in the desensitization and internalization of activated seven-transmembrane receptors. Recently, beta-arrestin 2 has been shown to act as a signal mediator in mitogen-activated protein kinase cascades and to play a positive regulatory role in chemotaxis. We now show that beta-arrestin 1 is required to activate the small GTPase RhoA leading to the re-organization of stress fibers following the activation of the angiotensin II type 1A receptor. This angiotensin II type 1A receptor-directed RhoA activation and stress fiber formation also require the activation of the heterotrimeric G protein G(alphaq/11). Whereas neither beta-arrestin 1 nor G(alphaq/11) activation alone is sufficient to robustly activate RhoA, the concurrent recruitment of beta-arrestin 1 and activation of G(alphaq/11) leads to full activation of RhoA and to the subsequent formation of stress fibers.

Full Text

Duke Authors

Cited Authors

  • Barnes, WG; Reiter, E; Violin, JD; Ren, X-R; Milligan, G; Lefkowitz, RJ

Published Date

  • March 4, 2005

Published In

Volume / Issue

  • 280 / 9

Start / End Page

  • 8041 - 8050

PubMed ID

  • 15611106

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.M412924200


  • eng

Conference Location

  • United States