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- W2035522087 abstract "Deletion analysis of the human PRL promoter in endometrial stromal cells decidualized in vitro revealed a 536-bp enhancer located between nucleotide (nt) -2,040 to -1,505 in the 5'-flanking region. The 536-bp enhancer fragment ligated into a thymidine kinase (TK) promoter-luciferase reporter plasmid conferred enhancer activity in decidual-type cells but not nondecidual cells. DNase I footprint analysis of decidualized endometrial stromal cells revealed three protected regions, FP1-FP3. Transfection of overlapping 100-bp fragments of the 536-bp enhancer indicated that FP1 and FP3 each conferred enhancer activity. Gel shift assays indicated that both FP1 and FP3 bind activator protein 1 (AP-1), and JunD and Fra-2 are components of the AP-1 complex in decidual fibroblasts. Mutation of the AP-1 binding site in either FP1 or FP3 decreased enhancer activity by approximately 50%, while mutation of both sites almost completely abolished activity. Coexpression of the 536-bp enhancer and A-fos, a dominant negative to AP-1, decreased enhancer activity by approximately 70%. Conversely, coexpression of Fra-2 in combination with JunD or c-Jun and p300 increased enhancer activity 6- to 10-fold. Introduction of JunD and Fra-2 into nondecidual cells is sufficient to confer enhancer activity. JunD and Fra-2 protein expression was markedly increased in secretory phase endometrium and decidua of early pregnancy (high PRL content) compared with proliferative phase endometrium (no PRL). These investigations indicate that the 5'-flanking region of the human PRL gene contains a decidua-specific enhancer between nt -2,040/-1,505 and AP-1 binding sites within this enhancer region are critical for activity." @default.
- W2035522087 created "2016-06-24" @default.
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- W2035522087 date "2001-04-01" @default.
- W2035522087 modified "2023-10-14" @default.
- W2035522087 title "Identification of a Decidua-Specific Enhancer on the Human Prolactin Gene with Two Critical Activator Protein 1 (AP-1) Binding Sites" @default.
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- W2035522087 doi "https://doi.org/10.1210/mend.15.4.0623" @default.
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