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• W1979393171 abstract "The potential role of iron and copper and the involvement of hydroxyl radicals in the DNA cleavage caused by chromate and glutathione (GSH) has been investigated. We have also studied the ability of chromate, on reaction with ascorbate as well as in mixed solutions of ascorbate and GSH, to cause DNA strand breaks. In both fully demetalated and conventional (i.e., metal contaminated) systems, chromate and GSH induced similar numbers of DNA strand breaks. This observation suggests that traces of iron or copper contaminating the reaction mixtures do not play a major role in the DNA cleavage caused by chromate and GSH. A series of hydroxyl radical scavengers exhibited a protective influence on the induction of DNA strand breaks. However, glucose and sucrose, both strong hydroxyl radical scavengers, showed no concentration-dependent inhibition of DNA cleavage. Competition kinetics studies yielded apparent rate constants that were not consistent with hydroxyl radicals being the species responsible for DNA strand breaks. Ascorbate in combination with chromate was also found to induce strand breaks in DNA; this damage could be attributed to reactive intermediates generated during the reduction. When mixed systems of ascorbate and GSH in the presence of chromate were investigated, there were clearly interactions between the two reductants." @default.
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• W1979393171 date "1994-09-01" @default.
• W1979393171 modified "2023-10-18" @default.
• W1979393171 title "The generation of DNA single-strand breaks during the reduction of chromate by ascorbic acid and/or glutathione in vitro." @default.
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• W1979393171 doi "https://doi.org/10.1289/ehp.94102s3237" @default.
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