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- W2024887041 abstract "In order to investigate the molecular mechanism(s) by which TRH regulates the biosynthesis of TSH, we are studying the effects of TRH on the expression of the TSH subunit genes (alpha and TSH beta). To study the structure-function relation of TRH stimulation of the activity of the single rat TSH beta gene, chimaeric plasmids were constructed. The 5'-flanking region of the rat TSH beta gene including exon 1 (5'-untranslated region) was inserted into a promoterless, modified pBR, chloramphenicol acetyltransferase (CAT) expression vector. After transfection, specific TSH beta promoter activity was evident in both TRH-responsive pituitary-derived GH3 and primary pituitary cell cultures. To determine potential regulation of TSH beta promoter-directed activity in these cells by TRH, cells were incubated with media containing TRH (10(-7) to 10(-11) M) for 1 to 48 h. TRH stimulated a 1.5- to 3-fold increase in TSH beta promoter activity. Concomitant with an increase in CAT activity was an anticipated increase in PRL synthesis in the GH3 cells in response to TRH. The TRH effect on the TSH beta gene was specific; no increase in CAT activity was detected for TKCAT (thymidine kinase of herpes simplex virus promoter), pBRCAT (no promoter), or TSH beta CAT (3'-5'-orientation). Similar results were obtained using primary pituitary cell cultures. Deletion mutation analysis indicated that TRH sensitivity was detected in a 1.1 kilobase, but not in a 0.38 kilobase TSH beta gene fragment suggesting that the TRH responsive element(s) resides at least in part within the 700 base pairs of the 5'-flanking sequence.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2024887041 date "1989-04-01" @default.
- W2024887041 modified "2023-10-15" @default.
- W2024887041 title "Thyrotropin-Releasing Hormone Stimulates the Activity of the Rat Thyrotropin β-Subunit Gene Promoter Transfected into Pituitary Cells" @default.
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- W2024887041 doi "https://doi.org/10.1210/mend-3-4-717" @default.
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