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Oxidation of glutathione during hydroperoxide metabolism in isolated hepatocytes of rainbow trout (Salmo gairdneri).
Fish Physiology and Biochemistry 1990 January
Freshly isolated rainbow trout hepatocytes were exposed to tert-butyl hydroperoxide (BuOOH), a substrate for glutathione peroxidase. BuOOH at a concentration approximately equimolar (1 mM) with intracellular reduced glutathione (GSH) caused a reversible increase in intracellular glutathione disulphide (GSSG) but did not compromise cell viability or damage membrane lipids. BuOOH at 10 mM caused a large irreversible increase in intracellular GSSG followed by efflux into the medium. Considerable leakage of lactate dehydrogenase and loss of highly unsaturated fatty acids, particularly docosahexaenoic acid also occurred. Dependence of hydroperoxide removal on flux through the hexose monophosphate pathway was suggested by the increased release of (14)CO2 from [1-(14)C] glucose from hepatocytes incubated with BuOOH.
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