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• W1966207112 endingPage "1304" @default.
• W1966207112 startingPage "1293" @default.
• W1966207112 abstract "Reduced glutathione (GSH) serves as a primary redox buffer and its depletion causes growth inhibition or apoptosis in many organisms. In Dictyostelium discoideum, the null mutant (gcsA(-)) of gcsA encoding gamma-glutamylcysteine synthetase shows growth arrest and developmental defect when GSH is depleted. To investigate the mechanism by which GSH depletion induces growth arrest, a proteomic analysis was performed and aldose reductase (AlrA) was identified as the most prominently induced protein in gcsA(-) cells. Induction of AlrA was dependent on GSH concentration and was repressed by GSH but not effectively by either the reducing agent such as dithiothreitol or overexpression of superoxide dismutase. Methylglyoxal (MG), a toxic alpha-ketoaldehyde, strongly induced alrA expression and AlrA catalysed MG reduction efficiently. The alrA knockdown gcsA(-) cells (gcsA(-)/alrA(as)) exhibited more decreased growth rate than gcsA(-) cells, whereas the gcsA(-) cells overexpressing alrA (gcsA(-)/alrA(oe)) showed the recovery of growth rate. Interestingly, intracellular MG levels were significantly augmented in gcsA(-)/alrA(as) cells compared with gcsA(-) cells following GSH depletion. By contrast, gcsA(-)/alrA(oe) cells showed repression of MG induction. Furthermore, MG treatment inhibited growth of wild-type KAx3 cells, inducing G1 phase arrest. Thus, our findings suggest that MG accumulated by GSH depletion inhibits cell growth in Dictyostelium." @default.
• W1966207112 created "2016-06-24" @default.
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• W1966207112 date "2008-11-04" @default.
• W1966207112 modified "2023-10-15" @default.
• W1966207112 title "Methylglyoxal accumulation by glutathione depletion leads to cell cycle arrest in<i>Dictyostelium</i>" @default.
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• W1966207112 doi "https://doi.org/10.1111/j.1365-2958.2008.06497.x" @default.
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