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- W2000570774 abstract "Thyroid hormones have a profound influence on human development and disease. The hypothalamic-pituitary-thyroid axis involves finely tuned feedback mechanisms to maintain thyroid hormone (TH) levels. Despite the important role of TH-negative feedback in regulating this axis, the mechanism by which this occurs is not clearly defined. Previous in vivo studies suggest separate roles for the two thyroid hormone receptor isoforms, THRA and THRB, in this axis. We performed studies using a unique pituitary thyrotroph cell line (TαT1.1) to determine the relative roles of THRA and THRB in the regulation of Tshb. Using chromatin immunoprecipitation assays, we found that THRB, not THRA, bound to the Tshb promoter. By selectively depleting THRB, THRA, or both THRA and THRB in TαT1.1 cells, we found that simultaneous knockdown of both THRB and THRA abolished T3-mediated down-regulation of Tshb at concentrations as high as 100 nm T3. In contrast, THRA knockdown alone had no effect on T3-negative regulation, whereas THRB knockdown alone abolished T3-mediated down-regulation of Tshb mRNA levels at 10 nm but not 100 nm T3 concentrations. Interestingly, chromatin immunoprecipitation assays showed that THRA becomes enriched on the Tshb promoter after knockdown of THRB. Thus, a likely mechanism for the differential effects of THR isoforms on Tshb may be based on their differential DNA-binding affinity to the promoter." @default.
- W2000570774 created "2016-06-24" @default.
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- W2000570774 date "2012-06-01" @default.
- W2000570774 modified "2023-10-18" @default.
- W2000570774 title "Fundamentally Distinct Roles of Thyroid Hormone Receptor Isoforms in a Thyrotroph Cell Line Are due to Differential DNA Binding" @default.
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- W2000570774 doi "https://doi.org/10.1210/me.2011-1290" @default.
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