期刊
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
卷 93, 期 6, 页码 2366-2374出版社
OXFORD UNIV PRESS INC
DOI: 10.1210/jc.2007-2813
关键词
-
资金
- NICHD NIH HHS [HD 11149, P01 HD011149] Funding Source: Medline
- NIDDK NIH HHS [DK 52167] Funding Source: Medline
Context: Experimental and clinical studies in a variety of nonprimate species demonstrate that progesterone withdrawal leads to changes in gene expression that initiate parturition at term. Mice deficient in 5 alpha-reductase type I fail to undergo cervical ripening at term despite the timely onset of luteolysis and progesterone withdrawal in blood. Objective: Our objective was to test the hypothesis that estrogen and progesterone metabolism is regulated in cervical tissues during pregnancy, even in species in which parturition is not characterized by progesterone withdrawal in blood. Design: Estradiol and progesterone metabolism was quantified in intact cervical tissues from nonpregnant and pregnant women at term before or after labor. Setting: The study was conducted at a university hospital. Patients: Tissues were obtained from five nonpregnant and 21 pregnant women (nine before labor and 12 in labor). Main Outcome Measures: Enzyme activity measurements, Northern blot analysis, quantitative real-time RT-PCR, and immunohistochemistry were used to quantify steroid hormone metabolizing enzymes in cervical and myometrial tissues. Results: During pregnancy, 17 beta-hydroxysteroid dehydrogenase type 2 was induced in glandular epithelial cells to catalyze the conversion of estradiol to estrone and stroma-derived 20 alpha-hydroxyprogesterone to progesterone. During parturition, 17 beta-hydroxysteroid dehydrogenase type 2 was down-regulated in endocervical cells, thereby creating a microenvironment favorable for cervical ripening. Conclusions: Together, the data indicate that cervical ripening during parturition involves localized regulation of estrogen and progesterone metabolism through a complex relationship between cervical epithelium and stroma, and that steroid hormone metabolism in cervical tissues from pregnant women is unique from that in mice.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据