Biol Reprod. 2007 Sep;77(3):517-25. Epub 2007 May 30.

Regulation of 17-beta hydroxysteroid dehydrogenase type 2 in human placental endothelial cells.

Su EJ, Cheng YH, Chatterton RT, Lin ZH, Yin P, Reierstad S, Innes J, Bulun SE.

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Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Northwestern University, Chicago, Illinois 60611, USA.

Abstract

17-beta hydroxysteroid dehydrogenase type 2 (HSD17B2) oxidizes estradiol to estrone, testosterone to androstenedione, and 20 alpha-dihydroprogesterone to progesterone. HSD17B2 is highly expressed in human placental tissue where it is localized to placental endothelial cells lining the fetal compartment. The aim of this study was to investigate the effects of potential regulatory factors including progesterone, estradiol, and retinoic acid (RA) onHSD17B2 expression in primary human placental endothelial cells in culture.HSD17B2 mRNA expression was not regulated by progesterone, the progesterone agonist R5020, or estradiol treatment. RA significantly induced HSD17B2 mRNA levels and enzyme activity in a dose- and time-dependent manner. Maximal stimulation occurred at Hour 48 at an RA concentration of 10(-6) M. Both retinoic acid receptor alpha (RARA) and retinoid X receptor alpha (RXRA) were readily detected by immunoblotting in isolated placental endothelial cells. RNA interference directed against RARA or RXRA led to reduced basal levels of HSD17B2 mRNA levels and significantly abolished RA-stimulated HSD17B2 expression. Together, these data indicate that regulation of HSD17B2 mRNA levels and enzymatic activity by RA in the placenta is mediated by RARA and RXRA.

PMID:: 17538076; [PubMed - indexed for MEDLINE]

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