2,2',6,6'-Tetrachlorobiphenyl is estrogenic in vitro and in vivo.

Abstract:

:Polychlorinated biphenyls (PCBs) are ubiquitous environmental contaminants whose effects on biological systems depend on the number of and the positions of the chlorine substitutions. In the present study we examined the estrogenicity of the fully ortho-substituted PCB, 2,2',6,6'-tetrachlorobiphenyl (2,2',6,6'-TeCB). This PCB was chosen as the prototypical ortho-substituted PCB to test the hypothesis that ortho-substitution of a PCB with no para- or meta-chlorine-substitutions results in enhanced estrogenic activity. The results indicate that 2,2',6,6'-TeCB is estrogenic both in vitro, in the MCF-7 cell focus assay, and in vivo, in the rat uterotropic assay. The estrogenic activity elicited by the addition of 5 microM 2,2',6,6'-TeCB to the medium of MCF-7 cultures was inhibited by the estrogen receptor (ER) antagonist, LY156758, suggesting that 2,2',6,6'-TeCB or a metabolite is acting through an ER-dependent mechanism. Results from competitive binding assays using recombinant human (rh) ER indicate that 2,2',6,6'-TeCB does not bind rhERalpha or rhERbeta. A metabolite of 2,2',6,6'-TeCB, 2,2',6,6'-tetrachloro-4-biphenylol (4-OH-2,6,2',6'-TCB), does bind rhERalpha and rhERbeta and is also 10-fold more estrogenic than 2,2',6,6'-TeCB in the MCF-7 focus assay; however, this metabolite is not detected in the medium of MCF-7 cultures exposed to 2,2',6,6'-TeCB. Taken together, the results suggest that the estrogenicity observed in human breast cancer cells and the rat uterus may be due to 1) an undetected metabolite of 2,2',6,6'-TeCB binding to the ER, 2) 2,2',6,6'-TeCB binding directly to a novel form of the ER, or 3) an unknown mechanism involving the ER.

journal_name

J Cell Biochem

authors

Arcaro KF,Yi L,Seegal RF,Vakharia DD,Yang Y,Spink DC,Brosch K,Gierthy JF

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

94-102

issue

1

eissn

0730-2312

issn

1097-4644

pii

10.1002/(SICI)1097-4644(19990101)72:1<94::AID-JCB1

journal_volume

72

pub_type

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