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• W2040772236 endingPage "1196" @default.
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• W2040772236 abstract "We have shown previously that the PTH/PTHrP (PTH-related peptide) receptor mRNA becomes expressed very early in murine embryogenesis, i.e. during the formation of extraembryonic endoderm. Retinoic Acid (RA) is a potent inducer of extraembryonic endoderm formation and PTH/PTHrP-receptor expression in embryonal carcinoma (EC) and embryonal stem (ES) cells. Using the P19 EC cell line, we have characterized promoter elements of the murine PTH/PTHrP-receptor gene that are involved in this RA-induced expression. The data show that RA-induced expression of the PTH/ PTHrP-receptor gene is mediated by the downstream P2 promoter. Analysis of promoter reporter constructs in transiently transfected P19 cells treated with RA identified an enhancer region between nucleotides -2714 and -2702 upstream of the P2 transcription start site that is involved in the RA effect. This region matches a consensus hormone response element consisting of a direct repeat with an interspacing of 1 bp (R-DR1). The R-DR1 efficiently binds retinoic acid receptor-alpha (RARalpha)-retinoid X receptor-alpha (RXRalpha) and chicken ovalbumin upstream promoter (COUP)-transcription factor I (TFI)-RXRalpha heterodimers and RXRalpha and COUP-TFI homodimers in a bandshift assay using extracts of transiently transfected COS-7 cells. RA differentiation of P19 EC cells strongly increases protein binding to the R-DR1 in a band-shift assay. This is caused by increased expression of RXR (alpha, beta, or gamma) and by the induction of expression of RARbeta and COUP TFI/TFII, which bind to the R-DR1 as shown by supershifting antibodies. The presence of RXR (alpha, beta, or gamma) in the complexes binding to the R-DR1 suggests that RXR homodimers are involved in RA-induced expression of the PTH/PTHrP-receptor gene. The importance of the R-DR1 for RA-induced expression of PTH/ PTHrP-receptor was shown by an inactivating mutation of the R-DR1, which severely impairs RA-induced expression of PTH/PTHrP-receptor promoter reporter constructs. Since this mutation does not completely abolish RA-induced expression of PTH/PTHrP-receptor promoter reporter constructs, sequences other than the R-DR1 might also be involved in the RA effect. Finally, we show that the RA-responsive promoter region is also able to induce expression of a reporter gene in extraembryonic endoderm of 7.5 day-old transgenic mouse embryos." @default.
• W2040772236 created "2016-06-24" @default.
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• W2040772236 date "1999-07-01" @default.
• W2040772236 modified "2023-10-15" @default.
• W2040772236 title "Identification of a Retinoic Acid-Inducible Element in the Murine PTH/PTHrP (Parathyroid Hormone/Parathyroid Hormone-Related Peptide) Receptor Gene" @default.
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• W2040772236 doi "https://doi.org/10.1210/mend.13.7.0313" @default.
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