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- W2168550816 abstract "In liver, cysteine dioxygenase (CDO), cysteinesulfinate decarboxylase (CSD), and gamma-glutamylcysteine synthetase (GCS) play important regulatory roles in the metabolism of cysteine to sulfate, taurine and glutathione. Because glutathione is released by the liver and degraded by peripheral tissues that express gamma-glutamyl transpeptidase, some peripheral tissues may be exposed to relatively high concentrations of cysteine. Rats were fed diets that contained low, moderate or high concentrations of protein or supplemental cysteine or methionine for 2 wk, and CDO, CSD and GCS activities, concentrations and mRNA levels and the concentrations of cysteine, taurine and glutathione were measured in liver, kidney, lung and brain. All three enzymes in liver responded to the differences in dietary protein or sulfur amino acid levels, but only CSD in kidney and none of the three enzymes in lung and brain responded. Renal CSD activity was twice as much in rats fed the low protein diet as in rats fed the other diets. Changes in renal CSD activity were correlated with changes in CSD concentration. Some significant differences in cysteine concentration in kidney and lung and glutathione and taurine concentrations in kidney were observed, with higher concentrations in rats fed higher levels of protein or sulfur amino acids. In liver, the changes in cysteine level were consistent with cysteine-mediated regulation of hepatic CDO activity, and changes in taurine level were consistent with predicted changes in cysteine catabolism due to the changes in cysteine concentration and CDO activity. Changes in renal and lung cysteine, taurine or glutathione concentrations were not associated with a similar pattern of change in CDO, CSD or GCS activity. Overall, the results confirm the importance of the liver in the maintenance of cysteine homeostasis." @default.
- W2168550816 created "2016-06-24" @default.
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- W2168550816 date "2002-11-01" @default.
- W2168550816 modified "2023-10-16" @default.
- W2168550816 title "Enzymes and Metabolites of Cysteine Metabolism in Nonhepatic Tissues of Rats Show Little Response to Changes in Dietary Protein or Sulfur Amino Acid Levels" @default.
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- W2168550816 doi "https://doi.org/10.1093/jn/132.11.3369" @default.
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