PMID: 9178621Jul 1, 1997Paper

Effects of nitric oxide on force-generating proteins of skeletal muscle

Pflügers Archiv : European journal of physiology
S GallerA Göbesberger

Abstract

Nitric oxide (NO) has recently been identified as a physiologically important intracellular messenger modulating the contractile activity of skeletal muscle [Kobzik L, Reid MB, Bredt DS, Stamler JS (1994) Nature 372: 546-548]. However, the mechanism of action of NO is not yet known. We used skinned (demembranated) muscle fibres to investigate the mechanism of NO function in muscle contraction. Maximally Ca2+-activated single fibres of rat skeletal muscle were exposed to physiologically relevant NO concentrations by adding NO donor molecules into the bath solution. Donor application caused a decline both in the contractile properties and in the myofibrillar adenosine triphosphatase (ATPase) activity. These results reveal a novel molecular mechanism of NO action: a direct inhibition of the force-generating proteins in skeletal muscle.

Citations

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