Journal of Clinical Endocrinology & Metabolism, Vol 81, 3594-3598, Copyright © 1996 by Endocrine Society

ARTICLES

Human ovarian expression of 17 beta-hydroxysteroid dehydrogenase types 1, 2, and 3

Y Zhang, RA Word, S Fesmire, BR Carr and WE Rainey
Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas 75235-9032, USA.

Three isozymes of 17 beta-hydroxysteroid dehydrogenase (17 beta HSD) have been cloned and characterized as distinct gene products (17 beta HSD1, 17 beta HSD2, and 17 beta HSD3). The presence and location of these isozymes in the human ovary have not been defined. In this study, we utilized Northern analysis and RT-PCR to examine transcripts for the three isozymes of 17 beta HSD. RNA was isolated from ovarian cortex, stroma (pre- and postmenopausal), hilum, follicles, and corpora lutea obtained from adult women, as well as whole fetal ovaries. By Northern analysis, high levels of 17 beta HSD1 messenger RNA were found in follicles, corpora lutea, and cortex, whereas low levels were detected in the postmenopausal stroma and in fetal ovaries by RT-PCR. 17 beta HSD1 messenger RNA was not detected in hilar tissue by either Northern analysis or RT-PCR. Utilizing RT-PCR, transcripts for 17 beta HSD2 were not detectable in cortex, stroma, (pre-or postmenopausal), hilum, or follicles, but were present in RNA derived from the corpora lutea and fetal ovary. The androgenic isozyme 17 beta HSD3 was not detectable in any of the ovarian compartments examined by either Northern analysis or RT-PCR. These data provide additional insight into the mechanism of testosterone and estradiol synthesis within the ovary. Specifically, the high level of 17 beta HSD1 is clearly localized to follicles and corpora lutea indicating involvement in the synthesis of estradiol. Secondly, androgenic 17 beta HSD3 is not expressed in the human ovary. Thus testosterone production within the human ovary, occurring under physiological conditions, arises from either the 17 beta HSD1 or an uncharacterized isozyme.

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