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Effects of PCBs and MeSO2-PCBs on adrenocortical steroidogenesis in H295R human adrenocortical carcinoma cells.

Abstract：

:Some endocrine disrupting chemicals (EDCs) in the environment have been shown to exert their biological effects through interference with steroidogenesis. In this study, the potential effects of four selected polychlorinated biphenyl (PCB) congeners (PCB101, PCB110, PCB126 and PCB149) as well as several of their environmentally-relevant methylsulfonyl-(MeSO(2)-) PCB metabolites (3'-MeSO(2)-CB101, 4'-MeSO(2)-CB101, 4'-MeSO(2)-CB110, 3'-MeSO(2)-CB149 and 4'-MeSO(2)-CB149) on adrenocortical steroidogenesis were evaluated by in vitro bioassay based on the human adrenocortical carcinoma H295R cell line. The PCBs included in the study represented different structures and potential mechanisms of action. Cells were exposed for 48 h to 10 microM of each PCB congener in the presence or absence of 20% (w/w) of their corresponding MeSO(2)-PCB metabolite(s). After the chemical treatments, changes in mRNA expression of 11 steroidogenic genes (CYP11A, CYP11B1, CYP11B2, CYP17, CYP19, CYP21, 3beta-HSD1, 3beta-HSD2, 17beta-HSD1, StAR and HMGR) were quantified using molecular beacon-based real-time RT-PCR. Genes coding for enzymes involved in the later or final steps of steroid production (CYP11B1, CYP11B2, CYP19, 3beta-HSD1, 3beta-HSD2 and 17beta-HSD1) were up-regulated to various extents by most PCBs. The greatest transcriptional activations (2.8-29.9-fold) were elicited by PCB110 on CYP11B1, CYP11B2, 3beta-HSD2 and CYP19, and PCB149 on CYP11B1, 3beta-HSD1 and 17beta-HSD1. Increased expression of these steroidogenic genes might ultimately lead to a change in hormonal balance through excessive production of steroid hormones including aldosterone, cortisol and estradiol. In addition, co-treatment with 3'- and 4'-MeSO(2)-PCB149 resulted in a significant decrease in PCB149-induced 3beta-HSD1 and 17beta-HSD1 expression. This result indicates that some PCB congeners and their MeSO(2)-metabolites may affect steroidogenesis via different mechanisms. Overall, these findings suggest that PCBs and PCB metabolites can affect regulation of adrenocortical steroidogenesis.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Xu Y,Yu RM,Zhang X,Murphy MB,Giesy JP,Lam MH,Lam PK,Wu RS,Yu H

doi

10.1016/j.chemosphere.2005.08.013

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

772-84

issue

5

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(05)01009-X

journal_volume

63

pub_type

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