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Published on: November 3, 2023
Ischemia-reperfusion-induced cardiac injury: a brief review
Scott K Powers1, Zsolt Murlasits, Min Wu
1Department of Applied Physiology and Kinesiology, Center for Exercise Science, University of Florida, Gainesville, FL 32611, USA. spowers@hhp.ufl.edu
Insights
Myocardial ischemia-reperfusion (IR) injury, a major cause of heart disease mortality, involves radical production, calcium disturbances, and protease activation. Mitochondria play a key role in determining cell death pathways in IR injury.
Area of Science:
- Cardiovascular Science
- Cellular Biology
- Pathophysiology
Background:
- Myocardial ischemia-reperfusion (IR) injury is a significant cause of mortality in coronary artery disease.
- IR injury results from complex cellular events including radical production, calcium homeostasis disturbances, and protease activation.
- Mitochondrial injury is increasingly recognized as a critical factor in IR-induced cell death, influencing necrosis or apoptosis.
Purpose of the Study:
- To summarize current understanding of cellular events contributing to IR-induced cardiac injury and cell death.
- To introduce the concept of cardioprotection and successful cardioprotective strategies.
- To identify knowledge gaps in IR-induced myocardial injury to stimulate future research.
Main Methods:
- This is a review article, synthesizing existing research.
- It summarizes established knowledge on cellular mechanisms of IR injury.
- It discusses current approaches to cardioprotection based on scientific literature.
Main Results:
- IR injury involves radical production, calcium dysregulation, protease activation, and critical mitochondrial dysfunction.
- Mitochondria are key determinants of myocyte fate (necrosis vs. apoptosis) post-IR.
- Several successful cardioprotective strategies exist that can induce a protective phenotype.
Conclusions:
- Understanding the cellular basis of IR injury is crucial for developing effective treatments.
- Cardioprotection strategies aim to mitigate IR-induced damage by targeting key cellular pathways.
- Further research is needed to address existing gaps in knowledge regarding IR injury mechanisms and interventions.
Abstract:
Myocardial ischemia-reperfusion (IR) injury is the primary contributor to the morbidity and mortality associated with coronary artery disease. Depending on the duration of ischemia, three levels of IR-induced cardiac injury have been identified. The cellular events leading to IR-induced cellular injury are complex, but the key elements include IR-induced radical production, cellular disturbances in calcium homeostasis, and activation of cellular proteases. Moreover, growing evidence indicates that mitochondrial injury plays a major role in IR-induced injury, because mitochondria seem to be the final arbitrators of IR-induced cell death and determine whether the myocyte will die from necrosis or apoptosis. This review will provide a brief summary of our current understanding of the cellular events that contribute to IR-induced cardiac injury and cell death. Further, we will briefly introduce the concept of cardioprotection and outline several successful approaches that can induce a cardioprotective phenotype. Finally, in hopes of stimulating future research, this review will also identify important gaps in our knowledge of IR-induced myocardial injury.
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