GSH added to rat liver homogenates inhibited respiration and increased GSSG formation approximately proportionally to the amount of GSH added; the effect was increased by added magnesium chloride. Added NADPH and citrate decreased GSSG formation and increased respiration; 6·0mm-nicotinamide prevented GSSG formation and increased respiration. There was a negative correlation between GSSG formation and oxygen uptake. It is suggested that the decrease in oxygen uptake is mainly due to GSSG concentration and also that in vivo a GSH–GSSG steady state occurs.

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