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The myocardial renin-angiotensin system: existence, importance, and clinical implications
1Multi-Organ Transplant Center, Methodist Hospital, Houston, TX.
American Heart Journal
|April 1, 1992
Insights
The heart contains components of the renin-angiotensin system. ACE inhibition benefits may extend to the heart, impacting cardiac function and potentially mitigating negative effects.
Area of Science:
- Cardiovascular Physiology
- Molecular Cardiology
Background:
- The renin-angiotensin system (RAS) plays a crucial role in cardiovascular regulation.
- Components of the RAS, including angiotensin II, are present within cardiac tissue.
Purpose of the Study:
- To investigate the presence and functional implications of the cardiac renin-angiotensin system.
- To explore the direct effects of angiotensin II on myocardial function and the potential benefits of ACE inhibition within the heart.
Main Methods:
- Localization studies of RAS components in cardiac tissue.
- Functional assays assessing the impact of angiotensin II on myocardial contractility, hypertrophy, and electrophysiology.
- Evaluation of the effects of ACE inhibitors on cardiac RAS activity and function.
Main Results:
- Cardiac tissue harbors key components of the renin-angiotensin system.
- Cardiac-derived angiotensin II demonstrates a dual role, potentially enhancing myocardial contractility while promoting adverse effects like hypertrophy, vasoconstriction, and arrhythmias.
- Evidence suggests that Angiotensin-Converting Enzyme (ACE) inhibition offers benefits that extend directly to the cardiac tissue, beyond its systemic effects.
Conclusions:
- The heart possesses an intrinsic renin-angiotensin system with significant functional implications.
- ACE inhibition may exert direct cardioprotective effects by modulating the cardiac RAS.
- Targeting the cardiac RAS presents a potential therapeutic strategy for various cardiovascular conditions.
Abstract:
Major components of the renin-angiotensin system have been localized to cardiac tissue. Cardiac-derived angiotensin II may benefit myocardial contractility but may promote detrimental myocardial hypertrophy, coronary vasoconstriction, and arrhythmias. The benefits of ACE inhibition probably extend beyond the classic circulating RAS to include the heart directly.