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The aryl hydrocarbon receptor (AhR), when activated by exogenous ligands such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), regulates expression of several phase I and phase II enzymes and is also involved in the regulation of cell proliferation. Several studies suggest that endogenous AhR ligand(s) may exist. One putative endogenous ligand is indirubin, which was recently identified in human urine...
The effects of a series of non-ortho-substituted polychlorinated biphenyls (PCBs) on human cytochrome P450 1A1 (CYP1A1), a 17β-estradiol (E 2 ) 2-hydroxylase, and P450 1B1 (CYP1B1), an E 2 4-hydroxylase, were investigated in HepG2 and MCF-7 cells. Elevated rates of 2- and 4-methoxyestradiol (2- and 4-MeOE 2 ) formation in PCB-treated cultures were measured as activities of...
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