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• W2023806468 abstract "The molecular mechanisms by which arsenic (As3+) causes human cancers remain to be fully elucidated. Enhancer of zeste homolog 2 (EZH2) is the catalytic subunit of polycomb-repressive complexes 2 (PRC2) that promotes trimethylation of lysine 27 of histone H3, leading to altered expression of tumor suppressors or oncogenes. In the present study, we determined the effect of As3+ on EZH2 phosphorylation and the signaling pathways important for As3+-induced EZH2 phosphorylation in human bronchial epithelial cell line BEAS-2B. The involvement of kinases in As3+-induced EZH2 phosphorylation was validated by siRNA-based gene silencing. The data showed that As3+ can induce phosphorylation of EZH2 at serine 21 in human bronchial epithelial cells and that the phosphorylation of EZH2 requires an As3+-activated signaling cascade from JNK and STAT3 to Akt. Transfection of the cells with siRNA specific for JNK1 revealed that JNK silencing reduced serine727 phosphorylation of STAT3, Akt activation and EZH2 phosphorylation, suggesting that JNK is the upstream kinase involved in As3+-induced EZH2 phosphorylation. Because As3+ is capable of inducing miRNA-21 (miR-21), a STAT3-regulated miRNA that represses protein translation of PTEN or Spry2, we also tested the role of STAT3 and miR-21 in As3+-induced EZH2 phosphorylation. Ectopic overexpression of miR-21 promoted Akt activation and phosphorylation of EZH2, whereas inhibiting miR-21 by transfecting the cells with anti-miR-21 inhibited Akt activation and EZH2 phosphorylation. Taken together, these results demonstrate a contribution of the JNK, STAT3 and Akt signaling axis to As3+-induced EZH2 phosphorylation. Importantly, these findings may reveal new molecular mechanisms underlying As3+-induced carcinogenesis." @default.
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• W2023806468 date "2012-12-19" @default.
• W2023806468 modified "2023-10-16" @default.
• W2023806468 title "JNK and STAT3 signaling pathways converge on Akt-mediated phosphorylation of EZH2 in bronchial epithelial cells induced by arsenic" @default.
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• W2023806468 doi "https://doi.org/10.4161/cc.23030" @default.
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