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J. Biol. Chem., Vol. 259, Issue 15, 9355-9358, Aug, 1984

Inhibition of glutathione efflux from isolated rat hepatocytes by methionine

TY Aw, M Ookhtens and N Kaplowitz

A substantial inhibition (50-70%) of GSH efflux by methionine was demonstrated in hepatocytes isolated from fed rats. Concurrent measurements of intracellular GSH revealed maintenance of a higher concentration in methionine-supplemented cells over the 1-h incubation. Analysis of total GSH suggested that maintenance of higher intracellular GSH by methionine could be quantitatively accounted for by inhibition of GSH efflux rather than by net GSH synthesis. This conclusion was supported by studies with propargylglycine, a potent inhibitor of cysteine synthesis from methionine. Identical results were obtained in incubations containing either propargylglycine and methionine or methionine alone, thereby suggesting that net synthesis of GSH from methionine was minimal under the assay conditions. Similar decreases (40-60%) in the rate of extracellular accumulation of GSH were observed with ethionine and buthionine, two higher homologs of methionine, but not with a wide range of other naturally occurring and synthetic amino acids. The inhibition of GSH efflux by methionine was not dependent on the presence of sodium in the medium and did not correlate with metabolic consumption of ATP.
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