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• W2113554624 abstract "Arsenic is an environmental contaminant with known cytotoxic and carcinogenic properties, but the cellular mechanisms of its action are not fully known. As retrotransposition consists a potent mutagenic factor affecting genome stability, we investigated the effect of arsenic on retrotransposition of an enhanced green fluorescent protein (EGFP)-tagged nonautonomous long terminal repeat (LTR)-retrotransposon viral-like 30 (VL30) in a mouse NIH3T3 cell culture-retrotransposition assay. Flow cytometry analysis of assay cells treated with 2.5-20μM sodium arsenite revealed induction of retrotransposition events in a dose- and time-dependent manner, which was further confirmed as genomic integrations by PCR analysis and appearance of EGFP-positive cells by UV microscopy. Specifically, 20μM sodium arsenite strongly induced the VL30 retrotransposition frequency, which was ~90,000-fold higher than the natural one and also VL30 RNA expression was ~6.6-fold. Inhibition of the activity of endogenous reverse transcriptases by efavirenz at 15μM or nevirapine at 375μM suppressed the arsenite-induced VL30 retrotransposition by 71.16 or 79.88%, respectively. In addition, the antioxidant N-acetyl-cysteine reduced the level of arsenite-induced retrotransposition, which correlated with the rescue of arsenite-induced G2/M cell cycle arrest and cell toxicity. Treatment of assay cells ectopically overexpressing the human heat-shock protein 70 (Hsp70) with 15μM sodium arsenite resulted in an additional ~4.5-fold induction of retrotransposition compared with normal assay cells, whereas treatment with 20μM produced a massive cell death. Our results show for the first time that arsenic both as an oxidative and heat-shock mimicking agent is a potent inducer of VL30 retrotransposition in mouse cells. The impact of arsenic-induced retrotransposition, as a cellular response, on contribution to or explanation of the arsenic-associated toxicity and carcinogenicity is discussed." @default.
• W2113554624 created "2016-06-24" @default.
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• W2113554624 date "2013-05-24" @default.
• W2113554624 modified "2023-10-16" @default.
• W2113554624 title "Arsenic Induces VL30 Retrotransposition: The Involvement of Oxidative Stress and Heat-Shock Protein 70" @default.
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• W2113554624 doi "https://doi.org/10.1093/toxsci/kft118" @default.
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• W2113554624 hasPublicationYear "2013" @default.
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