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• W2178770720 abstract "Previous studies have shown that progestin induces the production of fibronectin (FN) and its mRNA content in human endometrial stromal cells. The mechanism of the upregulation was unclear. In the present study, we provide evidence that hPR regulates the FN promoter activity mainly through the CRE/AP1 site located in the proximal region of the promoter in human decidual fibroblasts. Various lengths of the proximal region of the FN promoter were linked to the reporter vector to construct promoter-reporter plasmids and were then transfected into human decidual fibroblasts. Deletion and mutation analysis showed that CRE/AP1 and Sp1 sites in the proximal region mediated the basal promoter activity. To evaluate progestin-mediated transcriptional activation, decidual fibroblasts were transfected with p300 (FN promoter-reporter construct) and hPR expression vector. Cells treated with medroxyprogesterone acetate (MPA) increased the promoter activity ranging from 2.5- to 9-fold determined in 10 decidual specimens. hPRA enhanced activation was stronger than that of hPRB. Structural analysis of hPR showed that DNA and ligand binding domains are essential for the activation, and missing the TAF1 domain weakens the activation. The proximal promoter region of the FN gene lacks a canonical PRE site. Mutation at the CRE/AP1 site eliminated the upregulation by progestin. To evaluate the interaction of hPR with the CRE/AP1 site, the CRE/AP1 site was mutated to the consensus AP1 cis-element (TGACGTCA, -172 to -165 bp, mutated to TGAC_TCA) which eliminated the CREB binding. FN promoter activity derived from p300AP1 mutant was found to be higher than that of p300. These results showed that hPR interacts with the AP1 binding proteins, but not with CREB. Progestin treatment or overexpression hPR did not alter appreciably the content of c-jun or c-fos in decidual fibroblasts nuclear extracts. Antibody to hPR (hPRa3), which precipitated hPR also coprecipitated c-jun and c-fos, whereas CREB was not precipitated by hPRa3. The observation implies that hPRs are brought to the FN promoter region by AP1 proteins to enhance the transcription. In summary, this study provides molecular evidence that the CRE/AP1 site and c-jun/c-fos in decidual fibroblasts mediate the hPR-enhanced activation of FN transcription." @default.
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• W2178770720 date "2003-10-01" @default.
• W2178770720 modified "2023-09-27" @default.
• W2178770720 title "Progesterone Receptor (hPR) Upregulates the Fibronectin Promoter Activity in Human Decidual Fibroblasts" @default.
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• W2178770720 doi "https://doi.org/10.1089/104454903770238102" @default.
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