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DeltaPKC-mediated activation of epsilonPKC in ethanol-induced cardiac protection from ischemia.

Abstract：

:Previous studies have demonstrated that acute ethanol exposure induces activation of delta protein kinase C (deltaPKC) and epsilonPKC, and mimics ischemic preconditioning via epsilonPKC activation. However, the role of deltaPKC isozyme in ischemia and reperfusion is still controversial. Here, we investigated the role of deltaPKC in ethanol-induced cardioprotection using a selective deltaPKC activator (psideltaRACK), or inhibitor (deltaV1-1), and a selective epsilonPKC inhibitor (epsilonV1-2) in isolated mouse hearts. Mice were injected intraperitoneally or by gavage with ethanol, regulators of delta and epsilonPKC or an adenosine A1 receptor blocker (DPCPX). Isolated perfused mouse hearts were subjected to a 30-min global ischemia and a 120-min reperfusion, ex vivo. Injection of 0.5 g/kg ethanol 1 h, but not 10 min, before ischemia reduced infarct size and CPK release. Pretreatment with epsilonV1-2 abolished this ethanol-induced cardioprotection. Pretreatment with deltaV1-1 induced cardioprotection when injected with ethanol (0.5 g/kg) 10 min before ischemia, but deltaV1-1 partly inhibited ethanol-induced cardioprotection when injected with ethanol 1-h before the onset of ischemia. psideltaRACK injection 1 h, but not 10 min, before ischemia induced cardioprotection and translocation of epsilonPKC from the cytosol to the particulate fraction. Pretreatment with DPCPX or epsilonV1-2 inhibited psideltaRACK-induced cardioprotection and translocation of epsilonPKC. Therefore, activation of deltaPKC-induced by ethanol or by the deltaPKC activator is cardioprotective, provided that sufficient time passes to allow deltaPKC-induced activation of epsilonPKC, an A1 adenosine receptor-dependent process.

journal_name

J Mol Cell Cardiol

journal_title

Journal of molecular and cellular cardiology

authors

Inagaki K,Mochly-Rosen D

doi

10.1016/j.yjmcc.2005.05.014

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

203-11

issue

2

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(05)00169-0

journal_volume

39

pub_type

杂志文章

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