Prodeath signaling of G protein-coupled receptor kinase 2 in cardiac myocytes after ischemic stress occurs via extracellular signal-regulated kinase-dependent heat shock protein 90-mediated mitochondrial targeting.

Abstract:

RATIONALE:G protein-coupled receptor kinase 2 (GRK2) is abundantly expressed in the heart, and its expression and activity are increased in injured or stressed myocardium. This upregulation has been shown to be pathological. GRK2 can promote cell death in ischemic myocytes, and its inhibition by a peptide comprising the last 194 amino acids of GRK2 (known as carboxyl-terminus of β-adrenergic receptor kinase [bARKct]) is cardioprotective. OBJECTIVE:The aim of this study was to elucidate the signaling mechanism that accounts for the prodeath signaling seen in the presence of elevated GRK2 and the cardioprotection afforded by the carboxyl-terminus of β-adrenergic receptor kinase. METHODS AND RESULTS:Using in vivo mouse models of ischemic injury and also cultured myocytes, we found that GRK2 localizes to mitochondria, providing novel insight into GRK2-dependent pathophysiological signaling mechanisms. Mitochondrial localization of GRK2 in cardiomyocytes was enhanced after ischemic and oxidative stress, events that induced prodeath signaling. Localization of GRK2 to mitochondria was dependent on phosphorylation at residue Ser670 within its extreme carboxyl-terminus by extracellular signal-regulated kinases, resulting in enhanced GRK2 binding to heat shock protein 90, which chaperoned GRK2 to mitochondria. Mechanistic studies in vivo and in vitro showed that extracellular signal-regulated kinase regulation of the C-tail of GRK2 was an absolute requirement for stress-induced, mitochondrial-dependent prodeath signaling, and blocking this led to cardioprotection. Elevated mitochondrial GRK2 also caused increased Ca(2+)-induced opening of the mitochondrial permeability transition pore, a key step in cellular injury. CONCLUSIONS:We identify GRK2 as a prodeath kinase in the heart, acting in a novel manner through mitochondrial localization via extracellular signal-regulated kinase regulation.

journal_name

Circ Res

journal_title

Circulation research

authors

Chen M,Sato PY,Chuprun JK,Peroutka RJ,Otis NJ,Ibetti J,Pan S,Sheu SS,Gao E,Koch WJ

doi

10.1161/CIRCRESAHA.112.300754

subject

Has Abstract

pub_date

2013-04-12 00:00:00

pages

1121-34

issue

8

eissn

0009-7330

issn

1524-4571

pii

CIRCRESAHA.112.300754

journal_volume

112

pub_type

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