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- W2004758712 abstract "Rat heart ornithine decarboxylate activity from isoproterenol-treated rats was inactivated in vitro by reactive species of oxygen generated by the reaction xanthine/xanthine oxidase. Reduced glutathione, dithiothreitol and superoxide dismutase has a protective effect in homogenates and in partially purified ornithine decarboxylase exposed to the xanthine/xanthine oxidase reaction, while diethyldithiocarbamate, which is an inhibitor of superoxide dismutase, potentiated the damage induced by O2- on enzyme activity. Dithiothreitol at concentrations above 1.25 mM had an inhibitory effect upon supernatant ornithine decarboxylase activity, while at 2.5 mM it was most effective in the recovery of ornithine decarboxylase activity, after the purification of the enzyme by the ammonium sulphate precipitation procedure. The ornithine decarboxylase inactivated by the xanthine/xanthine oxidase reaction showed a higher value of Km and a reduction of Vmax with respect to control activity. The exposure of rats to 100% oxygen for 3 h reduced significantly the isoproterenol-induced heart ornithine decarboxylase activity. The injection with diethyldithiocarbamate 1 h before hyperoxic exposure further reduced heart ornithine decarboxylase activity." @default.
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- W2004758712 date "1982-10-01" @default.
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- W2004758712 title "Effect of oxygen radicals and hyperoxia on rat heart ornithine decarboxylase activity" @default.
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- W2004758712 doi "https://doi.org/10.1016/0304-4165(82)90214-8" @default.
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