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• W2101292083 abstract "Abstract An assay for reduced and oxidized glutathione was adapted to isolated rat epididymal adipocytes in order to correlate pentose phosphate cycle activity and glutathione metabolism. In collagenase-digested adipocytes the [GSH/GSSG] molar ratio was in excess of 100. Cells incubated for 1 hr with low glucose concentrations (0.28–0.55 m m ) had higher GSH contents (3.2 μg/10 6 cells) than in the absence of glucose (2.3 μg/10 6 cells). The glutathione oxidant diamide caused a dose-related decrease in intracellular GSH, an increase in GSSG released into the medium, but no detectable change in the low intracellular GSSG content. The intracellular content of GSH and amount of GSSG released into the medium were therefore taken to reflect the glutathione status of the adipocytes most closely. Addition of H 2 O 2 to a concentration of 60 μ m to adipocytes caused to decline within 5 min in GSH content, which was less severe and more rapid to recover in the presence of 1.1 m m glucose, suggesting that the concomitant stimulation of glucose C-1 oxidation induced by the peroxide in the presence of glucose provided NADPH for regeneration of GSH. Further evidence for tight coupling between adipocyte [GSH/GSSG] ratios and pentose phosphate cycle activity was that (i) lowering intracellular GSH to 35–60% of control values by agents as diverse in action as t-butyl hydroperoxide, diamide, or the sulfhydryl blocker N -ethylmaleimide resulted in optimal stimulation of glucose C-1 oxidation and fractional pentose phosphate cycle activity, and (ii) incubating adipocytes directly with 2.5 m m GSSG resulted in a slight increase in glucose C-1 oxidation and when 0.5 m m NADP + was also added a synergistic effect on pentose phosphate cycle activity was found. On the other hand, electron acceptors such as methylene blue did not lower cellular GSH content, but did stimulate the pentose phosphate cycle, confirming a site of action independent of glutathione metabolism. The results show that (i) glucose metabolism by the pentose phosphate cycle contributes to regeneration of GSH and that (ii) glutathione metabolism either directly or via coupled changes in [NADPH/NADP + ] ratios may play a significant role in short-term control of the pentose phosphate cycle." @default.
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• W2101292083 date "1981-03-01" @default.
• W2101292083 modified "2023-09-23" @default.
• W2101292083 title "The role of glutathione in rat adipocyte pentose phosphate cycle activity" @default.
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• W2101292083 doi "https://doi.org/10.1016/0003-9861(81)90016-3" @default.
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