PMID: 9449244Aug 1, 1997Paper

3,5,3',5'-tetrachlorobiphenyl is a weak oestrogen agonist in vitro and in vivo

The Journal of Steroid Biochemistry and Molecular Biology
K Nesaretnam, P D Darbre

Abstract

Polychlorinated biphenyls (PCBs) are widespread, persistent environmental contaminants of which some congeners can act as endocrine disrupters. Previous work has shown that 3,4,3',4'-tetrachlorobiphenyl (PCB77) can act as an oestrogen with actions mediated through the oestrogen receptor. Here, oestrogenic actions have been assessed for two further tetrachlorobiphenyl isomers. Assays of oestrogenic action have involved (1) ligand regulation of oestrogen-sensitive gene expression; (2) ligand regulation of cell growth in oestrogen-dependent human breast cancer cell lines MCF7 McGrath and ZR-75-1; and (3) ligand activity in the immature mouse uterine weight bioassay in vivo. These results demonstrate that 3,5,3',5'-tetrachlorobiphenyl (PCB 80) can be considered to be a weak oestrogen agonist, but the 2,5,2',5'-congener (PCB 52) revealed no oestrogenic properties in any of these assays. Implications of these results are discussed in relation to structure-activity predictions for environmental oestrogens.

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Citations

Sep 5, 2002·Journal of Applied Toxicology : JAT·P D DarbreM J Sauer
Feb 28, 2002·The Journal of Steroid Biochemistry and Molecular Biology·J R ByfordP D Darbre
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