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Cardiovascular Research 2006 69(4):788-797; doi:10.1016/j.cardiores.2005.12.014
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Copyright © 2006, European Society of Cardiology

Caveolins and the regulation of endothelial nitric oxide synthase in the heart

Olivier Feron and Jean-Luc Balligand*

Unit of Pharmacology and Therapeutics, FATH 5349, Department of Medicine, Université catholique de Louvain, 53 avenue Mounier, 1200 Brussels, Belgium

* Corresponding author. Tel.: +32 2 764 9326; fax: +32 2 764 9322. Email address: Balligand{at}mint.ucl.ac.be

Virtually all cell types within the myocardium express caveolae, where cell-specific isoforms of caveolin both maintain the structural organisation of these cholesterol-rich of the plasmalemma and serve as scaffolds for the dynamic constitution of "signalosomes", or hubs concentrating numerous transmembrane signaling proteins and their effectors. Analysis of the phenotype of mice with genetic deletion or overexpression of specific caveolin isoforms has provided key evidence for the importance of caveolins and caveolae in several aspects of the cardiovascular biology, including vascular contractility, lipid metabolism, angiogenesis, or the control of cardiac hypertrophy. Among specific protein–protein interactions involving caveolins in cardiac tissue, these genetic models unequivocally confirmed the functional importance of the dynamic association of the endothelial isoform of nitric oxide synthase (eNOS) for its post-translational regulation in endothelial cells and cardiac myocytes, which bears on the enzyme's capacity to modulate nitric oxide (NO)-dependent endothelial function, angiogenesis, and excitation–contraction coupling. We will review the current understanding of this regulation of eNOS (and potentially other NOS isoforms) through protein–protein interactions involving several G-protein-coupled receptors and other allosteric modulators in the context of emerging paradigms on the regulation of cardiac function by NO.

KEYWORDS Nitric oxide synthase; Caveolin; Endothelium; Cardiac myocytes; Angiogenesis; Contractility

Time for primary review 24 days


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