文章基本信息

标题：The Effect of Hydroxylated Polychlorinated Biphenyl (OH-PCB) on Thyroid Hormone Receptor (TR)-mediated Transcription through Native-Thyroid Hormone Response Element (TRE)
本地全文：下载
作者：Izuki AMANO ; Wataru MIYAZAKI ; Toshiharu IWASAKI 等
期刊名称：Industrial Health
印刷版ISSN：0019-8366
电子版ISSN：1880-8026
出版年度：2010
卷号：48
期号：1
页码：115-118
DOI：10.2486/indhealth.48.115
出版社：National Institute of Occupational Safety and Health
摘要：Polychlorinated biphenyls (PCBs) are known as environmental contaminants that may cause abnormal effect in various organs. We have previously reported that low dose of hydroxylated PCBs (OH-PCBs) including 4'-OH-2',3,3',4',5'-pentachloro biphenyl (4'-OH-PCB 106), suppressed thyroid hormone (TH) receptor (TR)-mediated transcription on several artificial TH-response elements (TREs) due to partial dissociation of TR from TRE. In the present study, we examined the effect of OH-PCB on TR-mediated transcription on native TRE-containing promoter, using malic enzyme (ME)-TRE. Transcriptional activity was measured by transient transfection based reporter gene assay in CV-1, fibroblast-derived clonal cells. TR-mediated transcription was suppressed by 4'-OH-PCB106 significantly and 4'-OH-PCB187 weakly, but not by 4'-OH-PCB165. To examine TR-TRE bindings under exposure of 4'-OH-PCB106, electrophoretic mobility shift assay (EMSA) was performed. In EMSA, TR was dissociated from ME-TRE by 4'-OH-PCB106. These findings suggest that OH-PCB may disrupt TR-mediated transcription on native promoter.
关键词：TR;Malic enzyme;Hydroxylated-PCB;Transcriptional regulation;Native promoter