Differential regulation of the human progesterone receptor gene through an estrogen response element half site and Sp1 sites

The Journal of Steroid Biochemistry and Molecular Biology
Larry N PetzA M Nardulli

Abstract

The progesterone receptor (PR) gene is regulated by estrogen in normal reproductive tissues and in MCF-7 human breast cancer cells. Although it is generally thought that estrogen responsiveness is mediated by interaction of the ligand-occupied estrogen receptor (ER) with estrogen response elements (EREs) in target genes, the human progesterone receptor (PR) gene lacks a palindromic ERE. Promoter A of the PR gene does, however, contain an ERE half site upstream of two adjacent Sp1 sites from +571 to +595, the +571 ERE/Sp1 site. We have examined the individual contributions of the ERE half site and the two Sp1 sites in regulating estrogen responsiveness. Transient transfection assays demonstrated that both Sp1 sites were critical for estrogen-mediated activation of the PR gene. Interestingly, rather than decreasing transcription, mutations in the ERE half site increased transcription substantially suggesting that this site plays a role in limiting transcription. Chromatin immunoprecipitation assays demonstrated that Sp1 was associated with the +571 ERE/Sp1 site in the endogenous PR gene in the absence and in the presence of estrogen, but that ERalpha was only associated with this region of the PR gene after MCF-7 cells had been t...Continue Reading

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Citations

Feb 22, 2012·The Journal of Dairy Research·Lucile YartFrédéric Dessauge
Oct 10, 2013·Animal : an International Journal of Animal Bioscience·L YartF Dessauge
Apr 6, 2013·Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc·Lisa BraunSebastian Aulmann
Jan 28, 2010·Seminars in Reproductive Medicine·Serdar E BulunJ Julie Kim
Jul 20, 2007·Nucleic Acids Research·Jennifer R Schultz-NortonAnn M Nardulli
Sep 13, 2006·Molecular and Cellular Biology·Damon B BoweJeffrey E Kudlow
Jan 24, 2013·Breast Cancer Research : BCR·Claire Médale-GiamarchiGilles Favre
Dec 3, 2009·Molecular Endocrinology·Jamie Bonéy-MontoyaAnn M Nardulli
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