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KATP channels and myocardial preconditioning: an update.
Garrett J Gross1, Jason N Peart
1Dept. of Pharmacology and Toxicology, Medical College of Wisconsin, 8701 Watertown Plank Rd., Milwaukee, WI 53226, USA. ggross@mcw.edu
American Journal of Physiology. Heart and Circulatory Physiology
|August 14, 2003
Summary
Ischemic preconditioning (IPC) protects the heart by activating ATP-sensitive potassium (KATP) channels. Both sarcolemmal and mitochondrial KATP channels, along with other mitochondrial targets, play crucial roles in this cardioprotective phenomenon.
Area of Science:
- Cardiology
- Molecular Biology
- Physiology
Background:
- Ischemic preconditioning (IPC) is a phenomenon where brief ischemia protects the heart from sustained injury.
- IPC can reduce infarct size, myocardial stunning, and cardiac arrhythmias.
- The ATP-sensitive potassium (KATP) channel is consistently implicated in IPC's cardioprotective signaling pathways.
Purpose of the Study:
- To review the evidence for the roles of sarcolemmal (sarcKATP) and mitochondrial (mitoKATP) channels in IPC.
- To explore recent findings on mitochondrial calcium-activated potassium (mitoKca) channels and the electron transport chain in IPC.
- To elucidate the trigger and downstream mediator roles of these channels in IPC and pharmacologically induced preconditioning (PC).
Main Methods:
- Literature review of existing studies on ischemic and pharmacologic preconditioning.
- Analysis of evidence implicating specific ion channels and cellular components in cardioprotection.
- Synthesis of findings regarding sarcolemmal, mitochondrial KATP, and mitochondrial calcium-activated potassium channels.
Main Results:
- Initial evidence pointed to sarcKATP channels mediating IPC effects.
- More recent findings highlight a significant role for mitoKATP channels.
- Emerging evidence suggests involvement of mitoKca channels and the electron transport chain in IPC-induced cardioprotection.
Conclusions:
- Both sarcKATP and mitoKATP channels are critical for IPC and pharmacologic PC.
- Mitochondrial targets, including mitoKca channels and the electron transport chain, are increasingly recognized as key mediators.
- Understanding these pathways is vital for developing novel cardioprotective strategies.