RGS5 promotes arterial growth during arteriogenesis.

Abstract:

:Arteriogenesis-the growth of collateral arterioles-partially compensates for the progressive occlusion of large conductance arteries as it may occur as a consequence of coronary, cerebral or peripheral artery disease. Despite being clinically highly relevant, mechanisms driving this process remain elusive. In this context, our study revealed that abundance of regulator of G-protein signalling 5 (RGS5) is increased in vascular smooth muscle cells (SMCs) of remodelling collateral arterioles. RGS5 terminates G-protein-coupled signalling cascades which control contractile responses of SMCs. Consequently, overexpression of RGS5 blunted Gαq/11-mediated mobilization of intracellular calcium, thereby facilitating Gα12/13-mediated RhoA signalling which is crucial for arteriogenesis. Knockdown of RGS5 evoked opposite effects and thus strongly impaired collateral growth as evidenced by a blockade of RhoA activation, SMC proliferation and the inability of these cells to acquire an activated phenotype in RGS5-deficient mice after the onset of arteriogenesis. Collectively, these findings establish RGS5 as a novel determinant of arteriogenesis which shifts G-protein signalling from Gαq/11-mediated calcium-dependent contraction towards Gα12/13-mediated Rho kinase-dependent SMC activation.

journal_name

EMBO Mol Med

journal_title

EMBO molecular medicine

authors

Arnold C,Feldner A,Pfisterer L,Hödebeck M,Troidl K,Genové G,Wieland T,Hecker M,Korff T

doi

10.15252/emmm.201403864

subject

Has Abstract

pub_date

2014-08-01 00:00:00

pages

1075-89

issue

8

eissn

1757-4676

issn

1757-4684

pii

emmm.201403864

journal_volume

6

pub_type

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