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KMID : 0624620130460020086
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BMB Reports
2013 Volume.46 No. 2 p.86 ~ p.91
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Tetrahydropteridines possess antioxidant roles to guard against glucose-induced oxidative stress in Dictyostelium discoideum
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Park Seon-Ok
Kim Hye-Lim
Lee Soo-Woong
Park Young-Shik
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Abstract
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Glucose effects on the vegetative growth of Dictyostelium discoideum Ax2 were studied by examining oxidative stress and tetrahydropteridine synthesis in cells cultured with different concentrations (0.5X, 7.7 g L(-1); 1X, 15.4 g L(-1); 2X, 30.8 g L(-1)) of glucose. The growth rate was optimal in 1X cells (cells grown in 1X glucose) but was impaired drastically in 2X cells, below the level of 0.5X cells. There were glucose-dependent increases in reactive oxygen species (ROS) levels and mitochondrial dysfunction in parallel with the mRNA copy numbers of the enzymes catalyzing tetrahydropteridine synthesis and regeneration. On the other hand, both the specific activities of the enzymes and tetrahydropteridine levels in 2X cells were lower than those in 1X cells, but were higher than those in 0.5X cells. Given the antioxidant function oftetrahydropteridines and both the beneficial and harmful effects of ROS, the results suggestglucose-induced oxidative stress in Dictyostelium, a process that might originate from aerobic glycolysis, as well as a protective role of tetrahydropteridines against this stress.
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KEYWORD
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Dictyostelium, Glucose, Mitochondria, Oxidative stress, Tetrahydropteridines
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