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Signaling by the angiotensin-converting enzyme
1Vascular Signalling Group, Institut für Kardiovaskuläre Physiologie, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany. fleming@em.uni-frankfurt.de
Circulation Research
|April 15, 2006
Summary
Angiotensin-converting enzyme (ACE) inhibitors offer cardiovascular protection through novel mechanisms beyond reducing angiotensin II and bradykinin. These include ACE substrate accumulation and signaling cascades, revealing complex renin-angiotensin system regulation.
Area of Science:
- Cardiovascular Pharmacology
- Biochemistry
- Molecular Biology
Background:
- Angiotensin-converting enzyme (ACE) inhibition is crucial for managing cardiovascular diseases.
- Traditional understanding attributes ACE inhibitor benefits to reduced angiotensin II and increased bradykinin.
- Emerging evidence points to additional, less-understood mechanisms of action.
Purpose of the Study:
- To explore novel mechanisms by which ACE inhibitors exert beneficial cardiovascular effects.
- To investigate the role of ACE substrates and signaling pathways in ACE inhibitor efficacy.
- To understand the interplay between ACE and its homologues, like ACE2, in cardiovascular homeostasis.
Main Methods:
- Review of recent scientific literature and experimental findings on ACE inhibitor mechanisms.
- Analysis of studies investigating ACE substrate accumulation (e.g., N-acetyl-seryl-aspartyl-lysyl-proline).
- Examination of research on ACE-mediated signaling cascades involving kinases like CK2 and JNK in endothelial cells.
Main Results:
- ACE inhibitors promote the accumulation of specific substrates like N-acetyl-seryl-aspartyl-lysyl-proline, which inhibits cardiac collagen deposition.
- ACE activation triggers signaling pathways in endothelial cells, involving CK2 and JNK, influencing gene expression.
- ACE2, an ACE homologue, appears to counterbalance detrimental effects of the classical renin-angiotensin system.
Conclusions:
- ACE inhibitors possess multifaceted mechanisms of action extending beyond classical renin-angiotensin system modulation.
- Novel pathways involving ACE substrates and intracellular signaling contribute significantly to cardiovascular protection.
- The renin-angiotensin system exhibits intricate internal regulatory mechanisms involving ACE and its homologues.