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- W2017385114 abstract "Autoregulation of the human thyroid hormone receptor beta 1 (hTR beta 1) promoter was assessed by chloramphenicol acetyltransferase and luciferase reporter assays of transient transfections into COS1 and GH3 cells, DNase I footprinting, and gel shift assays. A 5'-deletional analysis of the promoter showed that the region between -906 and -839 and the sequence from -438 to -130 were positively regulated by T3 in COS1 cells cotransfected with an hTR beta 1 expression vector. We also transfected deletion constructs into GH3 cells and showed similar effects of T3 on the trans-activation of the reporters. DNase I footprinting showed a protected inverted palindromic thyroid response element (TRE) at position -890 to -866 in the distal fragment and a direct repeat at position -190 to -166 in the proximal fragment, which were protected by TRs. Mutation of each TRE significantly decreased the trans-activation of the promoter by T3. Gel mobility shift assays showed both proximal and distal TREs formed a retarded band with hTR alpha 1 or hTR beta 1 expressed in COS1 cells and reticulocyte lysates. The bands formed on the distal TRE and the proximal TRE appear to be preferentially formed by a TR homodimer and a heterodimer, respectively. Furthermore, the band formed on the distal TRE disappeared after adding T3 but that on the proximal TRE did not. These results indicate that hTR beta 1 expression is directly regulated by hTR alpha 1, beta 1, and their ligand through two TREs. The different structure of the TREs in this promoter suggests their physiological role in transcriptional regulation may be different." @default.
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- W2017385114 date "1994-03-01" @default.
- W2017385114 modified "2023-09-26" @default.
- W2017385114 title "Two thyroid hormone response elements are present in the promoter of human thyroid hormone receptor beta 1." @default.
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- W2017385114 doi "https://doi.org/10.1210/mend.8.3.8015548" @default.
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