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- W1736629708 abstract "Reactive oxygen or nitrogen species (RONS) are produced during exercise due, at least in part, to the activation of xanthine oxidase. When exercise is exhaustive they cause tissue damage; however, they may also act as signals inducing specific cellular adaptations to exercise. We have tested this hypothesis by studying the effects of allopurinol-induced inhibition of RONS production on cell signalling pathways in rats submitted to exhaustive exercise. Exercise caused an activation of mitogen-activated protein kinases (MAPKs: p38, ERK 1 and ERK 2), which in turn activated nuclear factor kappaB (NF-kappaB) in rat gastrocnemius muscle. This up-regulated the expression of important enzymes associated with cell defence (superoxide dismutase) and adaptation to exercise (eNOS and iNOS). All these changes were abolished when RONS production was prevented by allopurinol. Thus we report, for the first time, evidence that decreasing RONS formation prevents activation of important signalling pathways, predominantly the MAPK-NF-kappaB pathway; consequently the practice of taking antioxidants before exercise may have to be re-evaluated." @default.
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- W1736629708 date "2005-08-01" @default.
- W1736629708 modified "2023-10-14" @default.
- W1736629708 title "Decreasing xanthine oxidase-mediated oxidative stress prevents useful cellular adaptations to exercise in rats" @default.
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- W1736629708 doi "https://doi.org/10.1113/jphysiol.2004.080564" @default.
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