PMID: 11922895Mar 30, 2002Paper

Increased effects of C-type natriuretic peptide on cardiac ventricular contractility and relaxation in guanylyl cyclase A-deficient mice

Cardiovascular Research
Melanie PierkesMichaela Kuhn

Abstract

The natriuretic peptides (NPs), atrial (ANP), B-type (BNP), and C-type (CNP) natriuretic peptides as well as their respective receptor-guanylyl cyclases (GC-A for ANP and BNP, and GC-B for CNP) are expressed in the heart. However, the local role of NPs in the regulation of cardiac contractility and the mutual interactions of NPs remain controversial. In the present study we evaluated the effects of ANP and CNP on cardiac function of wild-type (GC-A +/+) and GC-A-deficient (GC-A -/-) mice. The effects of NPs and their molecular mechanisms were assessed in the isolated perfused mouse working heart preparation. In GC-A +/+ hearts, CNP exerted a biphasic action: an immediate increase in inotropy and lusitropy, followed by a slowly developing negative inotropic effect. These effects were mimicked by the cGMP-analogue, 8-pCPT-cGMP. In contrast, ANP did not affect cardiac function. In GC-A -/- hearts, the immediate contractile responses to CNP and 8-pCPT-cGMP were significantly enhanced. CNP increased cardiac cGMP levels and stimulated phospholamban (PLB) phosphorylation; the effect on PLB, but not cGMP, was enhanced in GC-A -/- hearts. In addition, cardiac expression of cGMP-dependent protein kinase (cGK I) was significantly increase...Continue Reading

Citations

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