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Reducing infarct size in the setting of acute myocardial infarction
James M Downey1, Michael V Cohen
1Department of Physiology, University of South Alabama, College of Medicine, Mobile, AL 36688, USA. jdowney@usouthal.edu
Insights
Strategies to protect the heart during reperfusion after acute myocardial infarction are crucial. Research shows interventions applied during reperfusion, mimicking ischemic preconditioning, hold clinical promise for cardioprotection.
Area of Science:
- Cardiology
- Pharmacology
- Molecular Biology
Background:
- Acute myocardial infarction (AMI) necessitates reperfusion, but delays often prevent infarction prevention.
- Cardioprotection research has focused on interventions since ischemic preconditioning (IP) proved effective in animal models.
- IP's clinical use is limited by its requirement for pre-ischemic application.
Purpose of the Study:
- To explore cardioprotective strategies applicable during reperfusion for acute myocardial infarction.
- To identify interventions that trigger similar signaling pathways as ischemic preconditioning.
- To assess the potential of reperfusion-based strategies for clinical application in AMI.
Main Methods:
- Review of established animal models for testing pharmacological cardioprotective agents.
- Analysis of signaling pathways involved in ischemic preconditioning and reperfusion injury.
- Evaluation of novel strategies applied during reperfusion for their potential to mimic IP effects.
Main Results:
- Ischemic preconditioning is a potent cardioprotectant, with protection occurring during reperfusion.
- Reperfusion-based strategies activate signaling cascades like ERK and PI3K, preventing mitochondrial permeability transition pore formation.
- These strategies hold clinical promise by bypassing the need for pre-ischemic intervention.
Conclusions:
- Reperfusion-based cardioprotective strategies offer a promising clinical approach for acute myocardial infarction.
- Further preclinical vetting is essential before pharmaceutical industry involvement and clinical trials.
- Successful translation requires rigorous validation to maximize success in patient application.
Abstract:
Acute myocardial infarction is caused by coronary occlusion, and the mainstay of treatment has become reperfusion by either coronary angioplasty with possible stenting or surgical bypass grafting. Unfortunately, reperfusion can seldom be done soon enough to prevent infarction. Thus, the search for effective cardioprotection has been ongoing for more than 3 decades. After establishment of a suitable animal model to test the efficacy of pharmacological agents and other interventions, investigators found ischemic preconditioning to be a powerful and reproducible cardioprotectant. Much of the signaling pathway from cell receptor to end-effector has now been established even if the identity of the latter has not been proven. Remarkably, the actual protection is believed to occur during reperfusion rather than during ischemia. Yet, the clinical applicability of ischemic preconditioning is limited because of the obligate need to initiate it before ischemia. However, several strategies have been developed that can be applied at the time of reperfusion and which, therefore, hold clinical promise. These interventions are thought to trigger the same signaling cascades as ischemic preconditioning, which include activation of extracellular signal-regulated kinase and phosphatidylinositol 3-kinase and also somehow prevent mitochondrial permeability transition pore formation. Ultimately, deployment of any of these strategies for clinical use must involve the pharmaceutical industry, which is becoming increasingly reluctant to be involved. Before any approach is tested in the clinical arena, however, it should be thoroughly vetted in preclinical settings. Only then can industry maximize the chances that its application in man will have the highest chance of success.
