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Current Topics in Pharmacology   Volumes    Volume 3 
The intricate story of nitric oxide as regulator of skeletal muscle activity: a brief report
Giorgio Fanò, Pierre Tijskens, Francesco Coscia, Franco Cuccurullo, Giovanni Menchetti
Pages: 247 - 254
Number of pages: 8
Current Topics in Pharmacology
Volume 3 

Copyright © 1997 Research Trends. All rights reserved

Nitric oxide synthase (NOs) is an enzyme family that converts L-arginine into citrulline with the formation of an oxygen reactive intermediate, nitric oxide. This volatile compound can exist under three redox forms: nitric oxide radical, nitrosonium cation and nitroxyl anion with different chemical-physical properties. In skeletal muscle the most representative isoform which is typical of the nervous system (ncNOs) and about 90% of its activity is related to the dystrophin-glycoprotein complex of sarcolemmal component. The first data concerning a possible NO implication in the regulation of skeletal muscle activity, were those of Balon and Nadler who demonstrated a direct correlation “in vitro” between a long time electrical stimulation and skeletal muscle NO production. More recently other authors have demonstrated several NO-dependent effects during muscular activity: cGMP-mediated relaxing effect in fast twitch fibres, a stimulating action on force generation, and opposite effects (depending of NO species) on terminal cisternae calcium channels. These and others possibilities are discussed.
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