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• W2078198580 abstract "Although glutathione (GSH) concentration has been reported to diminish with age, the mechanism underlying such age-associated decline in the GSH content is not well understood. In this study, we compared the gene expression of both subunits of gamma-glutamylcysteine synthetase (GCS), the rate-limiting enzyme in de novo GSH synthesis, in young, adult, and old Fisher 344 rats. It was found that GCS activity was significantly decreased with increased age in liver, kidney, lung, and red blood cells (RBC). Parallel with the decreased enzyme activity, the protein and mRNA contents of both GCS subunits also changed inversely with age in liver, kidney, and lung, implying a decreased GCS gene expression during aging. Such a reduced GCS gene expression was accompanied by a decline in total GSH content without any change in cysteine concentration. Furthermore, the decreased GCS gene expression in old rats was not associated with a decline in the plasma insulin or cortisol level. This study showed, for the first time, that the expression of both GCS subunit genes was decreased in some organs of old rats, which would result in a reduced rate of GSH biosynthesis. Such decline in GSH synthetic capacity may underlie the observed decrease in GSH content during aging." @default.
• W2078198580 created "2016-06-24" @default.
• W2078198580 creator A5022255793 @default.
• W2078198580 creator A5031345172 @default.
• W2078198580 date "2000-02-01" @default.
• W2078198580 modified "2023-10-02" @default.
• W2078198580 title "Age-associated decline in γ-glutamylcysteine synthetase gene expression in rats" @default.
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• W2078198580 doi "https://doi.org/10.1016/s0891-5849(99)00269-5" @default.
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