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Submitted on June 20, 2005
Accepted on November 28, 2005
B May Contribute to the Onset of Labor through Inhibition of PR Function
Departments of Biochemistryand Obstetrics and Gynecology, North Texas March of Dimes Birth Defects Center, University of Texas Southwestern Medical Center, Dallas, Texas
* To whom correspondence should be addressed. E-mail: carole.mendelson{at}utsouthwestern.edu.
Progesterone acting via the progesterone receptor (PR) plays a critical role in maintaining uterine quiescence during pregnancy. In the present study, we tested the hypothesis that the transactivating capability of the PR is downregulated in the myometrium at term by a change in uterine PR isoform ratio resulting from local activation of the NF-
B pathway. Overexpression of the truncated PR-C isoform in human myometrial cells inhibited PR-B transactivation. Expression of PR isoforms, PR-A, PR-B and PR-C, was characterized by immunoblotting and quantitative (Q)-PCR, in fundal and lower uterine segment (LUS) myometrium from pregnant women in labor and not in labor and in the pregnant mouse uterus during late gestation. We observed a marked increase in levels of PR-C and transcriptionally active PR-B specifically in fundal myometrium of women in labor. In pregnant mouse uterus, levels of PR-B and PR-C also increased between 15 dpc and term, while expression of PR-A was dramatically upregulated on 19 dpc. In studies of uterine tissues of mice injected intraamniotically with surfactant protein A (SP-A) and of human myometrial and T47D breast cancer cells in culture, up-regulation of PR isoform expression was observed in response to activation of the NF-B pathway. ChIP analysis revealed interleukin-1-induced binding of NF-B to the PR promoter. Collectively these findings suggest that up-regulation of inhibitory PR isoform expression by NF-B activation in both laboring human fundus and pregnant mouse uterus near term may inhibit PR transactivation and thereby lead to a loss of uterine quiescence and the onset of labor.
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