Natriuretic peptide receptor-C regulates coronary blood flow and prevents myocardial ischemia/reperfusion injury: novel cardioprotective role for endothelium-derived C-type natriuretic peptide

Circulation
Adrian J HobbsAmrita Ahluwalia

Abstract

Ischemia/reperfusion (I/R) injury complicates myocardial infarction and stroke by exacerbating tissue damage and increasing risk of mortality. We have recently identified C-type natriuretic peptide (CNP) as an endothelium-derived hyperpolarizing factor in the mesenteric resistance vasculature and described a novel signaling pathway involving activation of natriuretic peptide receptor C (NPR-C), which plays a pivotal role in the regulation of local blood flow. We tested the hypothesis that CNP/NPR-C signaling is a novel regulatory pathway governing coronary blood flow and protecting against I/R injury. CNP and (Cys18)-atrial natriuretic factor (4-23) amide (cANF(4-23)) elicited dose-dependent decreases in coronary perfusion pressure (CPP) that were blocked by Ba(2+) and ouabain in the isolated Langendorff rat heart. The endothelium-dependent vasodilator acetylcholine elicited the release of CNP from the coronary endothelium. CNP and cANF(4-23) reduced infarct size after 25 minutes of global ischemia and 120 minutes of reperfusion, maintaining CPP and left ventricular pressure at preischemic values. The vasorelaxant and protective activity of CNP and cANF(4-23) were enhanced in the absence of endothelium-derived nitric oxide. End...Continue Reading

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