Mitochondrial membrane permeabilization and cell death during myocardial infarction: Roles of calcium and reactive oxygen species

Keith A Webster

Research output: Contribution to journalArticle

143 Citations (Scopus)

Abstract

Excess generation of reactive oxygen species (ROS) and cytosolic calcium accumulation play major roles in the initiation of programmed cell death during acute myocardial infarction. Cell death may include necrosis, apoptosis and autophagy, and combinations thereof. During ischemia, calcium handling between the sarcoplasmic reticulum and myofilament is disrupted and calcium is diverted to the mitochondria causing swelling. Reperfusion, while essential for survival, reactivates energy transduction and contractility and causes the release of ROS and additional ionic imbalance. During acute ischemia-reperfusion, the principal death pathways are programmed necrosis and apoptosis through the intrinsic pathway, initiated by the opening of the mitochondrial permeability transition pore and outer mitochondrial membrane permeabilization, respectively. Despite intense investigation, the mechanisms of action and modes of regulation of mitochondrial membrane permeabilization are incompletely understood. Extrinsic apoptosis, necroptosis and autophagy may also contribute to ischemia-reperfusion injury. In this review, the roles of dysregulated calcium and ROS and the contributions of Bcl-2 proteins, as well as mitochondrial morphology in promoting mitochondrial membrane permeability change and the ensuing cell death during myocardial infarction are discussed.

Original languageEnglish
Pages (from-to)863-884
Number of pages22
JournalFuture Cardiology
Volume8
Issue number6
DOIs
StatePublished - Nov 1 2012

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Mitochondrial Membranes
Reactive Oxygen Species
Cell Death
Myocardial Infarction
Calcium
Autophagy
Apoptosis
Reperfusion
Necrosis
Ischemia
Myofibrils
Sarcoplasmic Reticulum
Reperfusion Injury
Permeability
Mitochondria
Proteins

Keywords

  • apoptosis
  • Bcl-2
  • caspase
  • ischemia-reperfusion
  • necrosis
  • oxidative stress

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Molecular Medicine

Cite this

Mitochondrial membrane permeabilization and cell death during myocardial infarction : Roles of calcium and reactive oxygen species. / Webster, Keith A.

In: Future Cardiology, Vol. 8, No. 6, 01.11.2012, p. 863-884.

Research output: Contribution to journalArticle

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