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A model of mitochondrial superoxide production during ischaemia-reperfusion injury for therapeutic development and mechanistic understanding.

Published version
Peer-reviewed

Repository DOI


Type

Article

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Authors

Sorby-Adams, Annabel 
Prime, Tracy A 
Miljkovic, Jan Lj 
Prag, Hiran A 

Abstract

Ischaemia-reperfusion (IR) injury is the paradoxical consequence of the rapid restoration of blood flow to an ischaemic organ. Although reperfusion is essential for tissue survival in conditions such as myocardial infarction and stroke, the excessive production of mitochondrial reactive oxygen species (ROS) upon reperfusion initiates the oxidative damage that underlies IR injury, by causing cell death and inflammation. This ROS production is caused by an accumulation of the mitochondrial metabolite succinate during ischaemia, followed by its rapid oxidation upon reperfusion by succinate dehydrogenase (SDH), driving superoxide production at complex I by reverse electron transport. Inhibitors of SDH, such as malonate, show therapeutic potential by decreasing succinate oxidation and superoxide production upon reperfusion. To better understand the mechanism of mitochondrial ROS production upon reperfusion and to assess potential therapies, we set up an in vitro model of IR injury. For this, isolated mitochondria were incubated anoxically with succinate to mimic ischaemia and then rapidly reoxygenated to replicate reperfusion, driving a burst of ROS formation. Using this system, we assess the factors that contribute to the magnitude of mitochondrial ROS production in heart, brain, and kidney mitochondria, as well as screening for inhibitors of succinate oxidation with therapeutic potential.

Description

Keywords

Complex I, Ischaemia-reperfusion injury, Malonate, Mitochondria, Reverse electron transport, Succinate, Reperfusion Injury, Animals, Superoxides, Mitochondria, Succinic Acid, Reactive Oxygen Species, Succinate Dehydrogenase, Oxidation-Reduction, Malonates, Male, Rats, Mice

Journal Title

Redox Biol

Conference Name

Journal ISSN

2213-2317
2213-2317

Volume Title

72

Publisher

Elsevier BV
Sponsorship
Wellcome Trust (220257/Z/20/Z)
MRC (MC_UU_00028/4)