Endocrinology, Vol 118, 1312-1318, Copyright © 1986 by Endocrine Society

ARTICLES

Modulation of aromatase activity in human endometrial stromal cells by steroids, tamoxifen and RU 486

L Tseng, J Mazella and B Sun

The regulation of aromatase activity (AA) in human endometrial stromal cells by various steroids was studied in primary cell culture. Various progestins, but not androgens or glucocorticoids, stimulated AA. Medroxyprogesterone acetate (MPA) was the most potent progestin. Estrogen (E) alone did not change the activity but it potentiated the stimulation of AA by progestin. Biphasic regulation of AA by progestin was noted in both time- and dose-dependent manners. Endometrial AA was stimulated by MPA and reached the maximum rate between 2-5 days of incubation with subsequent decline of AA in prolonged culture. When stromal cells were treated with MPA (0.03 to 30 microM) for 3 days, AA was increased over the control at all the concentrations tested. The maximum was found at doses between 0.1-1 microM. The activities reduced steadily from the maximum stimulation to less than 50% when the concentration of MPA increased from 1-30 microM. In addition, initial treatment of stroma cells with MPA (1-3 days) resulted in further increase of activity after progestin withdrawal. The enhancement of the induction of AA by E did not alter the biphasic pattern regulated by progestin alone, i.e. E enhanced both the stimulation and the decay of AA. The time study of the effect of E showed that enhancement of AA required at least 10 h of incubation of E with MPA conditioned cells. The effect of E is dose dependent between 0.04-40 nM and shows the greatest effect in the presence of MPA between 0.01-1 microM. The optimal concentrations of E and progestin that stimulate AA in culture are similar to the plasma concentrations after pregnancy, suggesting that the physiological function of the endometrial aromatase is at the time of decidualization. The effects of antiprogestin, Ru 486, and antiestrogen, tamoxifen (TAM), on AA were studied. Ru 486 or TAM alone did not alter AA. Ru 486 inhibited the MPA stimulated AA in a dose- dependent manner suggesting that the effect of progestin may be mediated through a receptor mechanism. Enhancement, but no inhibitory effect, was observed when cells were treated with TAM + MPA and TAM + MPA + E. The effectiveness of Ru 486 to inhibit the induction of AA in endometrial cells may be of primary importance for contraception.

This article has been cited by other articles:

				M. Engman, L. Skoog, G. Soderqvist, and K. Gemzell-Danielsson The effect of mifepristone on breast cell proliferation in premenopausal women evaluated through fine needle aspiration cytology Hum. Reprod., June 24, 2008; (2008) den228v1. [Abstract] [Full Text] [PDF]

				N. Chabbert-Buffet, G. Meduri, P. Bouchard, and I. M. Spitz Selective progesterone receptor modulators and progesterone antagonists: mechanisms of action and clinical applications Hum. Reprod. Update, May 1, 2005; 11(3): 293 - 307. [Abstract] [Full Text] [PDF]

				L. Bernardini, I. Moretti-Rojas, M. Brush, F.J. Rojas, and J.P. Balmaceda Changes in expression of adenyl cyclase activity in human endometrium during hormone replacement therapy and ovarian stimulation Mol. Hum. Reprod., October 1, 1999; 5(10): 955 - 960. [Abstract] [Full Text] [PDF]

				D. Ghosh, S. Dhara, A. Kumar, and J. Sengupta Immunohistochemical localization of receptors for progesterone and oestradiol-17{beta} in the implantation site of the rhesus monkey Hum. Reprod., February 1, 1999; 14(2): 505 - 514. [Abstract] [Full Text] [PDF]

				L. Tseng and H. H. Zhu Progestin, Estrogen, and Insulin-like Growth Factor-I Stimulate the Prolactin Receptor mRNA in Human Endometrial Stromal Cells Reproductive Sciences, May 1, 1998; 5(3): 149 - 155. [Abstract] [PDF]