Ischemic preconditioning in the aging heart: from bench to bedside.

Area of Science:

• Cardiovascular Research
• Gerontology
• Molecular Cardiology

Background:

• Coronary artery disease (CAD) is a primary cause of mortality in individuals over 65 in industrialized nations.
• The decline in endogenous protective mechanisms, particularly cardiac ischemic preconditioning, is a proposed factor in age-related CAD.
• Cardiac ischemic preconditioning, a phenomenon where brief ischemia protects against subsequent prolonged ischemia, appears diminished in aging hearts.

Purpose of the Study:

• To investigate the age-related reduction in cardiac ischemic preconditioning.
• To explore potential mechanisms behind this age-related decline.
• To evaluate interventions that may preserve or restore ischemic preconditioning in aging.

Main Methods:

• Review of experimental and clinical studies examining age-related changes in cardiac ischemic preconditioning.
• Analysis of potential alterations in mediator release and intracellular pathways.
• Assessment of the efficacy of pharmacological stimuli, exercise training, and caloric restriction.

Main Results:

• Evidence suggests a reduction in ischemic preconditioning with aging, though some studies are debated due to methodology.
• Alterations in signaling molecules and intracellular pathways are implicated in this age-related deficit.
• Pharmacological approaches have largely failed to mimic preconditioning in older hearts.

Conclusions:

• The age-related decline in cardiac ischemic preconditioning is a significant concern for cardiovascular health in the elderly.
• Exercise training and caloric restriction, especially in combination, show promise in preserving or restoring this protective mechanism.
• Further research is needed to fully elucidate the mechanisms and optimize interventions for age-related cardiovascular protection.