Functional argument for the existence of an avian nitric oxide synthase in muscle mitochondria: effect of cold acclimation.

Abstract:

:We report the first evidence of a mitochondrial NO synthase (mtNOS) in bird skeletal muscle. In vitro, mtNOS activity stimulated by L-arginine reduced intermyofibrillar mitochondrial oxygen uptake and ATP synthesis rates, stimulated endogenous H(2)O(2) generation, but had no effect on oxidative phosphorylation efficiency. Arginine-induced effects were fully reversed by L-NAME, a known NOS inhibitor. When ducklings were cold exposed for 4 weeks, muscle mitochondria displayed an increased state 3 respiration, a reduced H(2)O(2) generation but no significant alteration in mtNOS activity. We conclude that mtNOS is expressed in avian skeletal muscle.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Rey B,Roussel D,Teulier L,Eyenga P,Degletagne C,Belouze M,Duchamp C

doi

10.1016/j.febslet.2010.11.032

subject

Has Abstract

pub_date

2011-01-03 00:00:00

pages

173-7

issue

1

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(10)00937-3

journal_volume

585

pub_type

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