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Modulation of cellular antioxidant defense activities by sodium arsenite in human fibroblasts

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Abstract

Many studies have shown that oxygen radicals can be produced during arsenic metabolism. We report here that in human fibroblasts (HFW cells) sodium arsenite exposure caused increased formation of fluorescent dichlorofluorescein (DCF) by oxidation of the nonfluorescent form. The enhanced DCF fluorescence was inhibited by a radical scavenger, butylated hydroxytoluene. The effects of sodium arsenite treatment on cellular antioxidant activities were then examined. Treatment of HFW cells with sodium arsenite resulted in a significant increase in heme oxygenase activity and ferritin level. Sodium arsenite-enhanced heme oxygenase synthesis was inhibited by co-treatment of cells with the antioxidants sodium azide and dimethyl sulfoxide. Furthermore, sodium arsenite treatment did not apparently affect glucose-6-phosphate dehydrogenase activity, but resulted in significantly increased glutathione levels and superoxide dismutase activity, slightly decreased glutathione peroxidase activity, and significantly decreased catalase activity. Sodium arsenite toxicity was partly reduced by addition of catalase to the culture medium. These results imply that arsenite can enhance oxidative stress in HFW cells.

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  1. Institute of Biomedical Sciences, Academia Sinica, 115, Taipei, Taiwan, Republic of China

    Te -Chang Lee & I -Ching Ho

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  1. Te -Chang Lee
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Lee, T.C., Ho, I.C. Modulation of cellular antioxidant defense activities by sodium arsenite in human fibroblasts. Arch Toxicol 69, 498–504 (1995). https://doi.org/10.1007/s002040050204

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  • DOI: https://doi.org/10.1007/s002040050204

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