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In this report, we demonstrated that the PSF heterodimer partner, p54nrb (non-POU-domain-containing, octamer binding protein), can also function as a transcription corepressor, independent of PSF. p54nrb Interacts directly with PR independent of progesterone. In contrast to PSF, p54nrb neither enhances PR protein degradation nor blocks PR binding to DNA. Rather, p54nrb recruits mSin3A through its N terminus to the PR-DNA complex, resulting in an inhibition of PR-mediated transactivation of the progesterone-response element-luciferase reporter gene. PR also repressed transcription of the connexin 43 gene (Gja1), an effect dependent on the presence of an activator protein 1 site within the proximal Gja1 promoter. Mutation of this site abolished PR-mediated repression and decreased the recruitment of PR and p54nrb onto the Gja1 promoter. Furthermore, knockdown p54nrb expression by small interfering RNA alleviated PR-mediated repression on Gja1 transcription, whereas overexpression of p54nrb enhanced it. In the physiological context of pregnancy, p54nrb protein levels decrease with the approach of labor in the rat myometrium. We conclude that p54nrb is a transcriptional corepressor of PR. Decreased expression of p54nrb at the time of labor may act to derepress PR-mediated inhibition on connexin 43 expression and contribute to the initiation of labor.<\/jats:p>","DOI":"10.1210\/me.2008-0357","type":"journal-article","created":{"date-parts":[[2009,5,7]],"date-time":"2009-05-07T20:44:50Z","timestamp":1241729090000},"page":"1147-1160","source":"Crossref","is-referenced-by-count":70,"title":["p54nrb Is a Transcriptional Corepressor of the Progesterone Receptor that Modulates Transcription of the Labor-Associated Gene, Connexin 43 (Gja1)"],"prefix":"10.1210","volume":"23","author":[{"given":"Xuesen","family":"Dong","sequence":"first","affiliation":[{"name":"Samuel Lunenfeld Research Institute (X.D., C.Y., O.S., S.J.L.), Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada M5G 1X5"},{"name":"The Prostate Center at Vancouver General Hospital (X.D., P.S.R.), Department of Urologic Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6H 3Z6"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Celeste","family":"Yu","sequence":"additional","affiliation":[{"name":"Samuel Lunenfeld Research Institute (X.D., C.Y., O.S., S.J.L.), Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada M5G 1X5"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oksana","family":"Shynlova","sequence":"additional","affiliation":[{"name":"Samuel Lunenfeld Research Institute (X.D., C.Y., O.S., S.J.L.), Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada M5G 1X5"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John R. 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