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• W1990225079 abstract "FSH is an important regulator of mammalian gametogenesis and the female reproductive cycle. Although little is known about the transcriptional regulation of the β-subunit (the rate-limiting subunit of FSH synthesis), sequence analysis of the ovine FSHβ promoter has revealed a number of potential activating protein-1 (AP-1; Jun/Fos)-binding sites. To determine whether the gene encoding theβ -subunit of ovine FSH (oFSHβ) is responsive to AP-1 transcriptional complexes, chimeric constructs containing deleted portions of the oFSHβ promoter fused to a luciferase reporter were transiently transfected along with c-Jun and c-Fos expression constructs into JAR cells. Analysis of these deletion constructs revealed that the proximal promoter of oFSHβ is highly stimulated by c-Jun and c-Fos proteins (typically 20-fold with a reporter construct containing oFSHβ sequences from −215 to +759 bp). This stimulation was lost when a similar construct containing sequences from −84 to+ 759 bp was tested. Transcriptional start site analysis using reverse transcription-PCR verified that the transcriptional initiation of the− 215-bp deletion construct, with or without cotransfected c-Jun/c-Fos, was the same as that observed in vivo. Computer analysis of oFSHβ sequences from −215 to +1 bp identified four putative AP-1-like elements, located at −155, −120, −83, and −10 bp. Gel retardation experiments using oligonucleotides corresponding to the four putative AP-1-like sites revealed that only −120 and −83 sites in oFSHβ bound AP-1 proteins in vitro. Site-directed mutagenesis of the −120 and −83 sites showed that each element was required for stimulation by c-Jun and c-Fos proteins as well as 12-O-tetradecanoyl phorbol-13-acetate in transient transfection assays. Finally, immunocytochemical dual labeling was used to show that more than 75% of all FSHβ-containing cells in ovine pituitary sections from cycling ewes contained nuclear c-Jun, JunB, JunD, and Fos proteins. These data, taken together, show that oFSHβ transcription can be stimulated by c-Jun and c-Fos proteins via two functionally linked AP-1-like sites in the oFSHβ proximal promoter and that these sites are likely to be important regulators of FSH production in vivo." @default.
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• W1990225079 date "1997-06-01" @default.
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• W1990225079 title "Two Proximal Activating Protein-1-Binding Sites Are Sufficient to Stimulate Transcription of the Ovine Follicle-Stimulating Hormone-β Gene*" @default.
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• W1990225079 doi "https://doi.org/10.1210/endo.138.6.5205" @default.
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