Concentration-dependent wrestling between detrimental and protective effects of H2O2 during myocardial ischemia/reperfusion.

Abstract:

:Reactive oxygen species (ROS) and endoplasmic reticulum (ER) stress are paradoxically implicated in myocardial ischemia/reperfusion (I/R) injury and cardioprotection. However, the precise interpretation for the dual roles of ROS and its relationship with the ER stress during I/R remain elusive. Here we investigated the concentration-dependent effects of hydrogen peroxide (H2O2) preconditioning (PC) and postconditioning (PoC) on the ER stress and prosurvival reperfusion injury salvage kinase (RISK) activation using an ex vivo rat myocardial I/R model. The effects of H2O2 PC and PoC showed three phases. At a low level (1 μM), H2O2 exacerbated I/R-induced left ventricular (LV) contractile dysfunction and ER stress, as indicated by enhanced phosphorylation of protein kinase-like ER kinase and expressions of glucose-regulated protein 78, X-box-binding protein 1 splicing variant, TNF receptor-associated factor 2, activating transcription factor-6 cleaved 50 kDa fragment, and caspase-12 cleavage, but the I/R-induced RISK activation including protein kinase B (PKB/Akt) and protein kinase Cɛ (PKCɛ) remained unchanged. Consistently, the postischemic LV performance in 1 μM H2O2 PC and PoC groups was improved by inhibiting ER stress with 4-phenyl butyric acid but not affected by the ER stress inducer, tunicamycin. At a moderate level (10-100 μM), H2O2 significantly improved postischemic LV performance and enhanced RISK activation, but it did no further alter the ER stress. The cardioprotection but not ER stress was abrogated with Akt or PKCɛ inhibitor wortmannin or ɛV1-2. At a high level (1 mM), H2O2 markedly aggravated the reperfusion injury and the oxidative stress but did not further enhance the RISK activation. In addition, 1 or 20 μM of H2O2 PC did not alter cardioprotective effects of ischemic PC in postischemic contractile performance and protein oxidation. Our data suggest that the differential effects of H2O2 are derived from a concentration-dependent wrestling between its detrimental stress and protective signaling.

journal_name

Cell Death Dis

journal_title

Cell death & disease

authors

Wang ZH,Liu JL,Wu L,Yu Z,Yang HT

doi

10.1038/cddis.2014.267

subject

Has Abstract

pub_date

2014-06-19 00:00:00

pages

e1297

issn

2041-4889

pii

cddis2014267

journal_volume

5

pub_type

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