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• W1601932687 abstract "High concentrations of glutathione (GSH) and two of its constituent amino acids, glutamate and glycine, are normally found in rat bile. To examine the role of intrabiliary GSH hydrolysis as a source of these amino acids, as well as of cystine in bile, the biliary excretion of GSH and free amino acids was measured in normal male Sprague-Dawley rats; in animals given either phenol 3,6-dibromphthalein disulfonate or diethyl maleate, inhibitors of GSH secretion into bile; and after a retrograde intrabiliary infusion of (alpha S, 5S)-alpha-amino-3-chloro-4,5-dihydro-5-isoxazoleacetic acid (AT-125), an irreversible inhibitor of gamma-glutamyl transferase activity. Total concentration of amino acids in normal rat bile ranged from 4 to 7 mM and was more than double the concentration in plasma (2-3 mM). Although most amino acids were detected in bile, glutamate and glycine were the most prevalent (1.2 and 1.0 mM, respectively), followed by the branched chain amino acids valine and leucine. The administration of phenol 3,6-dibromphthalein disulfonate (180 mumol/kg, intravenous), or of diethyl maleate (1 mmol/kg, intraperitoneal), resulted in a marked decrease in the biliary excretion of GSH, as well as a decrease in the excretion of glutamate, cystine, and glycine; however, the effects of these agents were not specific for the amino acid constituents of GSH. Following retrograde intrabiliary infusion of AT-125 (10 mumol/kg), there was an immediate and sustained doubling in the rate of biliary excretion of both GSH and glutathione disulfide and a marked decrease in the rate of excretion of glutamate. Varying the dose of AT-125 (0-20 mumol/kg) resulted in an inverse linear relation between hepatic gamma-glutamyl transferase activity and the biliary excretion of intact GSH. These findings suggest that most, if not all, of the free glutamate in excreted bile is formed from the intrabiliary hydrolysis of GSH. Prior to hydrolysis within the biliary tree, substantial concentrations of GSH must be transported from liver cells into bile; minimal canalicular concentrations of this tripeptide are estimated at 5 mM." @default.
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• W1601932687 date "1986-06-01" @default.
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• W1601932687 title "Intrabiliary glutathione hydrolysis. A source of glutamate in bile." @default.
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• W1601932687 doi "https://doi.org/10.1016/s0021-9258(19)57482-8" @default.
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