Expression and function of myometrial PSF suggest a role in progesterone withdrawal and the initiation of labor

XieN.; LiuL.; LiY.YuC.LamS.ShynlovaO.GleaveM.ChallisJ.R.G.LyeS.DongX.

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Expression and function of myometrial PSF suggest a role in progesterone withdrawal and the initiation of labor

机译：Expression and function of myometrial PSF suggest a role in progesterone withdrawal and the initiation of labor

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Progesterone (P4), acting through its receptor (PR), is essential for the maintenance of pregnancy. P4 acts by suppressing uterine contractility and the expression of contraction-associated proteins (CAP) such as connexin 43 (C×43). P4 levels must be reduced or its actions blocked to allow the increased expression of CAP genes and the initiation of labor. Although the importance of progesterone in pregnancy has been known for about 80 yr, the fundamental mechanisms by which P4/PR maintains myometrial quiescence and by which this signaling is blocked at term labor remain to be determined. In this manuscript, we demonstrate that ligand-bound PR interacts with the C×43 gene promoter through activator protein-1 transcription factors. We show that the ability of PR to repress C×43 transcription is conferred through the recruitment of the PR coregu- lator, polypyrimidine tract binding protein-associated splicing factor (PSF), and the further re- cruitment of the yeast switch independent 3 homolog A/histone deacetylase corepressor complex. PSF expression is elevated during pregnancy but falls toward term as a result of increased me- chanical stretch of the myometrium and a rise in the concentrations of circulating estrogen. These data together indicate that PSF is a critical regulator of P4/PR signaling and labor. We suggest that decreased PSF at term may result in a de-repression of PR transcriptional control of CAP genes and thereby contributes to a functional withdrawal of progesterone at term labor.

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《Molecular Endocrinology》 |2012年第8期|1370-1379|共10页
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XieN.; LiuL.; LiY.YuC.LamS.ShynlovaO.GleaveM.ChallisJ.R.G.LyeS.DongX.;
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Vancouver Prostate Center, Department of Urologic Sciences, University of British Columbia;

Samuel Lunenfeld Research Institute, University of Toronto, Toronto M5G 1X5, Canada;

Samuel Lunenfeld Research Institute, University of Toronto, Toronto M5G 1X5, Canada, Mount Sinai;

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中图分类内分泌腺疾病及代谢病;
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Expression and function of myometrial PSF suggest a role in progesterone withdrawal and the initiation of labor

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