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Ischaemic preconditioning: from molecular characterisation to clinical application--part I
N P Riksen1, P Smits, G A Rongen
1Departments of Pharmacology-Toxicology and General Internal Medicine, University Medical Centre St Radboud, Nijmegen, the Netherlands. N.Riksen@aig.umcn.nl
The Netherlands Journal of Medicine
|February 3, 2005
Summary
Ischaemic preconditioning enhances tolerance to reperfusion injury by activating intracellular signaling pathways. This protection, including delayed and remote effects, is crucial for limiting infarct size in myocardial ischaemia.
Area of Science:
- Cardiology
- Cellular Biology
- Biochemistry
Background:
- Ischaemic preconditioning is a protective mechanism against reperfusion injury.
- It is the most effective endogenous strategy for limiting infarct size, besides timely reperfusion.
- Understanding its mechanisms is vital for developing therapeutic interventions.
Purpose of the Study:
- To review the different forms of ischaemic preconditioning.
- To summarize the underlying molecular mechanisms of ischaemic preconditioning.
- To highlight the clinical relevance of preconditioning knowledge.
Main Methods:
- Review of existing scientific literature on ischaemic preconditioning.
- Analysis of trigger substances and intracellular signaling cascades.
- Examination of mitochondrial end-effectors involved in cardioprotection.
Main Results:
- Preconditioning involves trigger substances (adenosine, bradykinin, norepinephrine, opioids) activating signaling pathways.
- Mitochondrial targets include ATP-sensitive potassium channels and the permeability transition pore.
- Protection occurs acutely (2-3 hours) and is delayed (24 hours) requiring new protein synthesis (iNOS, COX-2, heat shock proteins).
- Remote preconditioning demonstrates organ protection beyond the preconditioned site.
Conclusions:
- Ischaemic preconditioning confers protection against cardiomyocyte necrosis and apoptosis.
- Delayed and remote preconditioning represent distinct protective phenomena.
- Knowledge of these mechanisms is essential for drug development targeting myocardial ischaemia.