Mitochondrial involvement in cardiac apoptosis during ischemia and reperfusion: can we close the box?
Myocardial ischemia is the main cause of death in the Western societies. Therapeutic strategies aimed to protect the ischemic myocardium have been extensively studied. Reperfusion is the definitive treatment for acute coronary syndromes, especially acute myocardial infarction; however, reperfusion has the potential to exacerbate tissue injury, a process termed reperfusion injury. Ischemia/reperfusion (I/R) injury may lead to cardiac arrhythmias and contractile dysfunction that involve apoptosis and necrosis in the heart. The present review describes the mitochondrial role on cardiomyocyte death and some potential pharmacological strategies aimed at preventing the opening of the box, i.e., mitochondrial dysfunction and membrane permeabilization that result into cell death. Data in the literature suggest that mitochondrial disruption during I/R can be avoided, although uncertainties still exist, including the fact that the optimal windows of treatment are still fairly unknown. Despite this, the protection of cardiac mitochondrial function should be critical for the patient survival, and new strategies to avoid mitochondrial alterations should be designed to avoid cardiomyocyte loss.
Center of Neurosciences and Cell Biology, Department of Zoology, University of Coimbra, 3004-517, Coimbra, Portugal.
Nuno G
NG
Machado
Marco G
MG
Alves
Rui A
RA
Carvalho
Paulo J
PJ
Oliveira
D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D006801:Humans; D008929:Mitochondria, Heart / Q000378:metabolism* / Q000473:pathology*; D017202:Myocardial Ischemia / Q000378:metabolism / Q000473:pathology; D015428:Myocardial Reperfusion Injury / Q000378:metabolism* / Q000473:pathology*; D015398:Signal Transduction / Q000502:physiology