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Endocrinology Vol. 138, No. 3 898-904
Copyright © 1997 by The Endocrine Society

Articles

Retinoic Acids Increase 17ß-Hydroxysteroid Dehydrogenase Type 1 Expression in JEG-3 and T47D Cells, but the Stimulation Is Potentiated by Epidermal Growth Factor, 12-O-Tetradecanoylphorbol-13-Acetate, and Cyclic Adenosine 3',5'-Monophosphate Only in JEG-3 Cells1

Yun-shang Piao, Hellevi Peltoketo, Annukka Jouppila and Reijo Vihko

Biocenter Oulu and Department of Clinical Chemistry, University of Oulu, Oulu, Finland

Address all correspondence and requests for reprints to: Dr. Hellevi Peltoketo, Biocenter Oulu, and Department of Clinical Chemistry, University of Oulu, Kajaanintie 50, FIN-90220 Oulu, Finland. E-mail: hpeltoke{at}whoccr.oulu.fi

Human 17ß-hydroxysteroid dehydrogenase type 1 (17HSD type 1) primarily catalyzes the reduction of low activity estrone to high activity estradiol in ovarian granulosa cells and placental trophoblasts. 17HSD type 1 is also present in certain peripheral tissues, such as breast tissue. In the present study we investigated the effects of retinoic acids (RAs) together with other stimuli known to modulate estradiol production and/or cell growth on expression of 17HSD type 1 in JEG-3 choriocarcinoma cells and estrogen-responsive T47D breast cancer cells. Treatment of cultured JEG-3 and T47D cells with all-trans-RA and 9-cis-RA increased reductive 17HSD activity and 17HSD type 1 messenger RNA expression severalfold in both cell lines. On the other hand, epidermal growth factor (EGF), Ca ionophore, the protein kinase C activator 12-O-tetradecanoylphorbol-13-acetate (TPA), and cAMP elevated 17HSD type 1 expression only in JEG-3 cells. Correspondingly, the effects of RAs were potentiated by EGF, TPA, and cAMP in JEG-3 cells, whereas no such phenomenon was observed in T47D cells. In JEG-3 cells, simultaneous administration of RAs with TPA and EGF maximally resulted in approximately 40- and 20-fold increases in 17HSD type 1 messenger RNA expression, respectively. The present data indicate that RAs may stimulate estradiol biosynthesis by regulating 17HSD type 1 expression in certain breast cancer and choriocarcinoma cells. The results suggest that interaction of multiple regulatory pathways is involved in maintaining high 17HSD type 1 expression in the placenta. In addition, regulation of 17HSD type 1 expression may be different in trophoblast cells from that in breast epithelial cells.




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