© 2003 by European Society of Cardiology
Copyright © 2003, European Society of Cardiology
Antihypertrophic actions of the natriuretic peptides in adult rat cardiomyocytes: importance of cyclic GMP
Howard Florey Institute, c/- The University of Melbourne, Parkville VIC 3010, Australia
* Corresponding author. Tel.: +61-383-445-654; fax: +61-393-481-707 r.ritchie{at}hfi.unimelb.edu.au
Atrial natriuretic peptide (ANP) prevents hypertrophy of neonatal cardiomyocytes. However, whether this effect is retained in the adult phenotype or if other members of the natriuretic peptide family exhibit similar antihypertrophic properties, has not been elucidated. Objective: Our objective was to examine whether the natriuretic peptides protect against adult cardiomyocyte hypertrophy in vitro. Methods: Adult rat cardiomyocytes were incubated with angiotensin II (Ang II)±ANP, B-type (BNP) or C-type (CNP) natriuretic peptides for determination of [3H]phenylalanine incorporation, c-fos mRNA expression and cyclic GMP. The effects of 8-bromo-cyclic GMP (cyclic GMP analogue), HS-142-1 (particulate guanylyl cyclase inhibitor) and KT5823 (cyclic GMP-dependent protein kinase inhibitor) were also investigated. Results: Ang II-stimulated increases in markers of hypertrophy, [3H]phenylalanine incorporation (to 136±3% of control, n=9) and c-fos mRNA expression (4.3±1.4-fold, n=5), were completely prevented by each of ANP, BNP or CNP. This protective action was accompanied by increased cardiomyocyte cyclic GMP. Inhibitory actions on [3H]phenylalanine incorporation were mimicked by 8-bromo-cyclic GMP, and were abolished by HS-142-1. KT5823 blocked the response to BNP and CNP, but not to ANP. Conclusion: ANP prevents hypertrophy of adult rat cardiomyocytes. This protective action is shared by BNP and CNP and involves activation of particulate guanylyl cyclase receptors. Antihypertrophic effects of BNP and CNP are mediated through cyclic GMP-dependent protein kinase, but ANP can activate additional pathways independent of cyclic GMP to prevent adult cardiomyocte hypertrophy. These novel findings are of interest particularly since BNP appears to exert antifibrotic rather than antihypertrophic actions in vivo [12], while CNP is thought to act at least in part via the endothelium [8].
KEYWORDS Angiotensin; Hypertrophy; Natriuretic peptide; Second messengers
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