beta-Arrestin 1 couples thrombin to the rapid activation of the Akt pathway.

Abstract:

:In a variety of cell types including chinese hamster embryonic fibroblasts (IIC9 cells), alpha-thrombin is a potent mitogen. Thrombin irreversibly activates Par 1, a member of the seven membrane-spanning superfamily of G protein-coupled receptors (GPCRs). This, in turn, activates several heterotrimeric G proteins and induces signaling pathways that are critical for cell cycle reentry and proliferation. In IIC9 cells, alpha-thrombin activates the phosphatidylinositol-3-OH kinase (PI 3-Kinase)/Akt pathway, which is essential for G1 cell cycle progression. At present the mechanism for activation and regulation of the PI 3-kinase/Akt pathway is not fully understood. My preliminary data demonstrates a role for beta-arrestin 1 in the regulation of alpha-thrombin-induced Akt activity. In addition to their importance in receptor down-regulation, beta-arrestins are now known to scaffold proteins involved in stimulating specific signaling pathways. My preliminary data show that equal to or precedes -thrombin activates a rapid Akt activity in a beta-arrestin 1-dependent manner in IIC9 cells.

journal_name

Ann N Y Acad Sci

authors

Goel R,Baldassare JJ

doi

10.1111/j.1749-6632.2002.tb04622.x

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

138-41

eissn

0077-8923

issn

1749-6632

journal_volume

973

pub_type

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