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We previously reported that TRH stimulated pituitary TSHβ gene expression via an immediate increase in NR4A1 in thyrotrophs. We demonstrated that NR4A1 mRNA levels are regulated by thyroid hormone. Pituitary NR4A1 mRNA levels were decreased in mice injected with L-T4. NR4A1 promoter activity was increased by the overexpression of TRβs, and these increases were decreased by T3, and the −27∼+152 bp...
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