Article (Scientific journals)
Regulation of the mammalian heart function by nitric oxide.
MASSION, Paul; Pelat, Michel; Belge, C. et al.
2005In Comparative Biochemistry and Physiology. Part A, Molecular and Integrative Physiology, 142 (2), p. 144-50
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Keywords :
Animals; Catecholamines/metabolism; Diastole; Heart/physiology; Humans; Models, Biological; Muscles/metabolism; Myocardial Contraction; Myocardial Infarction/metabolism; Myocardium/metabolism; Nitric Oxide/metabolism; Nitric Oxide Synthase/chemistry/metabolism; Protein Isoforms; Receptors, Adrenergic, beta/metabolism; Signal Transduction; Systole
Abstract :
[en] The mammalian heart expresses all three isoforms of nitric oxide synthases (NOS) in diverse cell types of the myocardium. Despite their apparent promiscuity, the NOS isoforms support specific signaling because of their subcellular compartmentation with colocalized effectors and limited diffusibility of NO in muscle cells. eNOS and nNOS sustain normal EC coupling and contribute to the early and late phases of the Frank-Starling mechanism of the heart. They also attenuate the beta1-/beta2-adrenergic increase in inotropy and chronotropy, and reinforce the pre- and post-synaptic vagal control of cardiac contraction. By doing so, the NOS protect the heart against excessive stimulation by catecholamines, just as an "endogenous beta-blocker". In the ischemic and failing myocardium, induced iNOS further reinforces this effect, as does eNOS coupled to overexpressed beta3-adrenoceptors. nNOS expression also increases in the aging and infarcted heart, but its role (compensatory or deleterious) is less clear. In addition to their direct regulation of contractility, the NOS modulate oxygen consumption, substrate utilization, sensitivity to apoptosis, hypertrophy and regenerative potential, all of which illustrate the pleiotropic effects of this radical on the cardiac cell biology.
Disciplines :
Anesthesia & intensive care
Author, co-author :
MASSION, Paul ;  Centre Hospitalier Universitaire de Liège - CHU > Soins intensifs
Pelat, Michel
Belge, C.
Balligand, J.-L.
Language :
English
Title :
Regulation of the mammalian heart function by nitric oxide.
Publication date :
2005
Journal title :
Comparative Biochemistry and Physiology. Part A, Molecular and Integrative Physiology
ISSN :
1095-6433
eISSN :
1531-4332
Publisher :
Elsevier Science, New York, United States - New York
Volume :
142
Issue :
2
Pages :
144-50
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 January 2012

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