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• W2000392664 abstract "The placenta is responsible for the production of progesterone (P) and estrogens during human pregnancy. In this study, the expression of several key steroidogenic enzymes was investigated in different cell types of human placenta during early and mid-gestation by in situ hybridization. 3Beta-hydroxysteroid dehydrogenase type 1 (3beta-HSD1), P450 aromatase (P450arom) and 17beta-hydroxysteroid dehydrogenase type 1 (17HSD1) were expressed abundantly in syncytiotrophoblast (ST) cells. These three enzymes were also detected in some column cytotrophoblast (CCT) cells. 17HSD5 was found in intravillous stromal (IS) cells in low levels, suggesting that androgens may be synthesized and metabolized in the placenta. 17HSD7 was found in all types of placental cells. Moreover, 17HSD2 was localized in IS cells. The expression level of 17HSD2 gradually increased during pregnancy weeks 7-16, concurrently with the androgen production by the male fetus. The present study provides evidence that CCT and IS cells participate in P and estrogen biosynthesis, in addition to ST cells. 17HSD2 also converts 20alpha-dihydroprogesterone (20-OH-P) to P, whereas 17HSD5 and 17HSD7 inactivate P. Therefore, the action of 3beta-HSD1 and 17HSD2 on P biosynthesis in the placenta is countered by 17HSD5 and 17HSD7, which may provide an optimal level of P for the maintenance and progression of pregnancy." @default.
• W2000392664 created "2016-06-24" @default.
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• W2000392664 date "2005-05-01" @default.
• W2000392664 modified "2023-09-25" @default.
• W2000392664 title "Expression of 3β-hydroxysteroid dehydrogenase type 1, P450 aromatase, and 17β-hydroxysteroid dehydrogenase types 1, 2, 5 and 7 mRNAs in human early and mid-gestation placentas" @default.
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• W2000392664 doi "https://doi.org/10.1016/j.placenta.2004.07.008" @default.
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