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• W2085426763 abstract "The aryl hydrocarbon receptor (AHR) mediates the toxic effects of halogenated aromatic hydrocarbons (HAHs), such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD), 2,3,4,7,8-pentachlorodibenzofuran (2,3,4,7,8-PeCDF) and 2,3,7,8-tetrachlorodibenzofuran (2,3,7,8-TCDF). Non-traditional activators, including omeprazole (Omp), are thought to regulate AHR action through phosphorylation rather than binding to the receptor. In this study, we examined the ability of these compounds to induce AHR-dependent regulation of cytochrome P450 1A1 (CYP1A1) and CYP1B1 in T-47D human breast cancer cells. The role of Y322, a residue implicated in Omp-dependent activation of AHR was also investigated. All four compounds induced CYP1A1 and CYP1B1 mRNA expression, with Omp differing from the HAHs. Chromatin immunoprecipitation assays revealed ligand- and gene-selectivity in the recruitment patterns of AHR coactivators. We also found that residue Y322 of human AHR was important for maximum activation of AHR by 2,3,7,8-TCDD and 2,3,4,7,8-PeCDF, but required for 2,3,7,8-TCDF and Omp in an AHR-deficient MCF-7 human breast cancer cell line. In summary, this study provides evidence for context- and ligand-selective differences in coactivator recruitment in AHR-regulated gene expression and reveal an important role of Y322 in AHR activation." @default.
• W2085426763 created "2016-06-24" @default.
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• W2085426763 date "2011-07-01" @default.
• W2085426763 modified "2023-09-27" @default.
• W2085426763 title "Differential ligand-dependent activation and a role for Y322 in aryl hydrocarbon receptor-mediated regulation of gene expression" @default.
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• W2085426763 doi "https://doi.org/10.1016/j.bbrc.2011.06.079" @default.
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