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Ischemic preconditioning protects against cardiac ischemia reperfusion injury without affecting succinate accumulation or oxidation.

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Pell, Victoria R 
Spiroski, Ana-Mishel  ORCID logo  https://orcid.org/0000-0002-8584-8048
Mulvey, John 
Burger, Nils 
Costa, Ana SH 

Abstract

Ischemia-reperfusion (IR) injury occurs when blood supply to an organ is disrupted and then restored, and underlies many disorders, notably myocardial infarction and stroke. While reperfusion of ischemic tissue is essential for survival, it also initiates cell death through generation of mitochondrial reactive oxygen species (ROS). Recent work has revealed a novel pathway underlying ROS production at reperfusion in vivo in which the accumulation of succinate during ischemia and its subsequent rapid oxidation at reperfusion drives ROS production at complex I by reverse electron transport (RET). Pharmacologically inhibiting ischemic succinate accumulation, or slowing succinate metabolism at reperfusion, have been shown to be cardioprotective against IR injury. Here, we determined whether ischemic preconditioning (IPC) contributes to cardioprotection by altering kinetics of succinate accumulation and oxidation during IR. Mice were subjected to a 30-minute occlusion of the left anterior descending coronary artery followed by reperfusion, with or without a protective IPC protocol prior to sustained ischemia. We found that IPC had no effect on ischemic succinate accumulation with both control and IPC mice having profound increases in succinate compared to normoxia. Furthermore, after only 1-minute reperfusion succinate was rapidly metabolised returning to near pre-ischemic levels in both groups. We conclude that IPC does not affect ischemic succinate accumulation, or its oxidation at reperfusion.

Description

Keywords

Ischemia-reperfusion injury, Ischemic preconditioning, Mitochondria, Succinate, Analysis of Variance, Animals, Disease Models, Animal, Energy Metabolism, Ischemic Preconditioning, Myocardial, Male, Metabolome, Metabolomics, Mice, Mitochondria, Myocardial Reperfusion Injury, Myocardium, Oxidation-Reduction, Reactive Oxygen Species, Succinic Acid

Journal Title

J Mol Cell Cardiol

Conference Name

Journal ISSN

0022-2828
1095-8584

Volume Title

123

Publisher

Elsevier BV
Sponsorship
MRC (unknown)
Medical Research Council (MC_UP_1002/1)
Wellcome Trust (110159/Z/15/Z)
Medical Research Council (MC_U105663142)
Medical Research Council (MC_UU_12022/6)
British Heart Foundation (PG/15/84/31670)