Abstract:
:Thyroid hormones stimulate gap junctional communication in rat liver WB-F344 epithelial cells, elevating connexin43 mRNA and protein levels. In the present work we analysed connexin43 expression in liver and heart samples from thyroid hormone-treated Wistar rats. Connexin43 mRNA was elevated 2.1-fold in rat liver samples as compared to controls, while there was no change in heart. Thyroid hormone response elements in the rat connexin43 promoter region were examined; a candidate sequence, including a binding site for ligand-dependent transcription factors, was identified at position -480 to -464. This putative regulatory element, rCx-480, contains a direct repeat structure separated by three base pairs (DR3-type element). In electrophoretic mobility shift assays using in vitro translated proteins, the rCx-480 element formed stronger complexes with thyroid hormone receptor alpha/retinoid X receptor alpha heterodimers than with vitamin D receptor/retinoid X receptor alpha heterodimers. In transfected Cos-7 cells, promoter activation was observed via this element after treatment with 3,3',5-triiodo-L-thyronine. Loss of binding was seen when the 3' half-site or the spacer region of the rCx-480 element were experimentally mutated, while a stronger binding was observed with mutations introduced in the 5' half-site.
journal_name
Biol Chemjournal_title
Biological chemistryauthors
Stock A,Sies Hdoi
10.1515/BC.2000.120keywords:
subject
Has Abstractpub_date
2000-09-01 00:00:00pages
973-9issue
9-10eissn
1431-6730issn
1437-4315journal_volume
381pub_type
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