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The Androgen and Progesterone Receptors Regulate Distinct Gene Networks and Cellular Functions in Decidualizing Endometrium

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The Androgen and Progesterone Receptors Regulate Distinct Gene Networks and Cellular Functions in Decidualizing Endometrium View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by St George's Online Research Archive 0013-7227/08/$15.00/0 Endocrinology 149(9):4462–4474 Printed in U.S.A. Copyright © 2008 by The Endocrine Society doi: 10.1210/en.2008-0356 The Androgen and Progesterone Receptors Regulate Distinct Gene Networks and Cellular Functions in Decidualizing Endometrium Brianna Cloke, Kaisa Huhtinen, Luca Fusi, Takeshi Kajihara, Maria Yliheikkila¨, Ka-Kei Ho, Gijs Teklenburg, Stuart Lavery, Marius C. Jones, Geoffrey Trew, J. Julie Kim, Eric W.-F. Lam, Judith E. Cartwright, Matti Poutanen, and Jan J. Brosens Institute of Reproductive and Developmental Biology (B.C., L.F., T.K., S.L., M.C.J., G.T., J.J.B.), Imperial College London, Hammersmith Hospital, London W12 ONN, United Kingdom and Department of Physiology (K.H., M.Y., M.P.), Institute of Biomedicine, University of Turku, 20520 Turku, Finland; Department of Obstetrics and Gynecology (T.K.), Saitama Medical School, Moroyama, Saitama, Japan; Cancer Research UK Labs (K.-K.H., E.W.-F.L.), Department of Oncology, Imperial College London, London W12 ONN, United Kingdom; Department of Reproductive Medicine and Gynecology (G.T.), University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands; Department of Obstetrics and Gynecology (J.J.K.), Division of Reproductive Biology Research, Northwestern University, Chicago, Illinois 60611; and Division of Basic Medical Sciences (J.E.C.), St. George’s, University of London, London SW17 0BZ, United Kingdom Progesterone is indispensable for differentiation of human formation and promoted motility and proliferation of de- endometrial stromal cells (HESCs) into decidual cells, a pro- cidualizing cells. In comparison, PR depletion perturbed cess that critically controls embryo implantation. We now the expression of many more genes, underscoring the im- show an important role for androgen receptor (AR) signal- portance of this nuclear receptor in diverse cellular func- ing in this differentiation process. Decreased posttransla- tions. However, several PR-dependent genes encode for sig- tional modification of the AR by small ubiquitin-like modifier naling intermediates, and knockdown of PR, but not AR, (SUMO)-1 in decidualizing cells accounted for increased compromised activation of WNT/␤-catenin, TGF␤/SMAD, responsiveness to androgen. By combining small interfer- and signal transducer and activator of transcription (STAT) ing RNA technology with genome-wide expression profil- pathways in decidualizing cells. Thus, the nonredundant ing, we found that AR and progesterone receptor (PR) reg- function of the AR in decidualizing HESCs, centered on ulate the expression of distinct decidual gene networks. cytoskeletal organization and cell cycle regulation, implies Ingenuity pathway analysis implicated a preponderance of an important role for androgens in modulating fetal-mater- AR-induced genes in cytoskeletal organization and cell mo- nal interactions. Moreover, we show that PR regulates tility, whereas analysis of AR-repressed genes suggested HESC differentiation, at least in part, by reprogramming involvement in cell cycle regulation. Functionally, AR de- growth factor and cytokine signal transduction. (Endocri- pletion prevented differentiation-dependent stress fiber nology 149: 4462–4474, 2008) ROGESTERONE IS A pleiotropic hormone that reg- transformation of endometrial stromal fibroblast into se- P ulates all aspects of female reproduction, from ovu- cretory, epithelioid-like decidual cells (2–4). In addition to lation and embryo implantation to parturition. The actions the morphological changes, decidualization bestows some of progesterone (P4) on reproductive target tissues are unique functional properties on human endometrial stro- mediated predominantly by its cognate nuclear receptors, mal cells (HESCs), including the ability to modulate local P4 receptor (PR)-A and PR-B, members of the superfamily immune cells, to resist environmental stress signals, and of ligand-dependent transcription factors. In the uterus, to modulate trophoblast invasion (2–4). Mice deficient in the postovulatory rise in P4 levels induces differentiation PR fail to mount a decidual response and are sterile (1). of the endometrial mucosa in preparation for pregnancy However, activation of PR is in itself insufficient to induce (1). A cardinal event in this remodeling process is the decidualization in mice or humans. Initiation of HESC differentiation is strictly dependent upon elevated cAMP First Published Online May 29, 2008 levels and sustained activation of the protein kinase A Abbreviations: AR, Androgen receptor; DHT, dihydrotestosterone; pathway, which in turn sensitize the cells to P4 (5, 6). Once EGFP, enhanced green fluorescent protein; F-actin, filamentous actin; decidualized, the endometrium becomes inextricably de- HESC, human endometrial stromal cell; IGFBP-1, insulin-like growth factor-binding protein-1; MLC2, light chain of myosin 2; MPA, me- pendent upon continuous P4 signaling for homeostasis, droxyprogesterone acetate; NT, nontargeting; P4, progesterone; PIAS1, and in the absence of pregnancy, falling P4 levels trigger protein inhibitor of activated STAT1; PR, P4 receptor; PRL, prolactin; RB, a cascade of events that results in apoptosis, proteolytic retinoblastoma protein; RTQ, real-time quantitative; siRNA, small in- breakdown of the superficial endometrium, focal bleed- terfering RNA; STAT3, signal transducer and activator of transcription 3; SUMO, small ubiquitin-like modifier. ing, and menstrual shedding (7). Endocrinology is published monthly by The Endocrine Society (http:// HESCs also abundantly express the androgen receptor www.endo-society.org), the foremost professional society serving the (AR) (8, 9), yet little is known about the function of this endocrine community. nuclear receptor family member in the decidual process. AR 4462 Cloke et al. • AR Function in Decidual Cells Endocrinology, September 2008, 149(9):4462–4474 4463 and PR are phylogenetically closely related and share 54 and are higher in secretory than proliferative endometrium (15). 80% sequence homology in their ligand- and DNA-binding Moreover, a rise in circulating androgen levels in the late domains, respectively (10). AR expression, which is confined luteal phase is associated with a conception cycle and levels to the stroma in cycling endometrium, decreases during the continue to rise in early pregnancy (16). Interestingly, both secretory phase, although the receptor remains detectable in lack and excess of circulating androgens in premature ovar- the decidua of early pregnancy (11, 12). Serum androgen ian failure and polycystic ovary syndrome, respectively, are levels fluctuate throughout the menstrual cycle, with levels associated with increased risk of early fetal loss and late peaking around ovulation (13, 14). However, tissue andro- obstetric complication due to impaired placental function, gen levels and conversion of androstenedione to testosterone such as preeclampsia (17–19). A B 345 6 cAMP/DHT/P4 * 5 cAMP/DHT 340 4 cAMP/P4 * 335 3 185 PRL P4 180 mIU/L/µg RNA) 2 cAMP * 3 175 1 170 (x10 0 250 secretion PRL 60 40 (relative to cAMP/P4) 200 20 150 0 DHT: 100 Days:2468 IGFBP-1 50 (ng/ml/10 µg RNA) 0 E Day: 0 2 4 6 8 6 cAMP+P4+DHT+CDX * cAMP+P4+DHT C 10 4 cAMP+P4 * 8 PRL ) 3 6 2 3 (x10 4 2 (x10 0 PRL/L19 mRNA PRL/L19 0 Days: 02468 cAMP: - + + + + P4: - - + - + DHT: - - - + + F 250 200 * * D dPRL luc -3000 -1 120 150 100 100 80 60 effect Relative 50 40 (%) secretion on PRL 20 0 (fold induction) (fold promoter activity 0 NT siRNA: --++-- cAMP: - + + + + AR siRNA: ----++ P4: - - + - + cAMP/P4: ++++++ DHT: - - - + + DHT: - + - + - + FIG. 1. DHT selectively enhances decidual PRL expression in a time-dependent manner. A, Primary HESCs were cultured in the presence of 8-br-cAMP, P4, and DHT as indicated. The medium was collected and cells harvested every 48 h. The data represent the mean PRL (upper panel) and IGFBP-1 (lower panel) concentrations (ϮSD) in the supernatant, with normalization for RNA content at each time point, of triplicate cultures. Significant differences were found in terms of PRL secretion between cultures treated with cAMP/P4 and cAMP/P4/DHT at 4, 6, and 8 d (*, P Ͻ 0.05). B, Primary HESCs were decidualized with 8-Br-cAMP, P4, and increasing concentrations of DHT (0.001, 0.01, 0.1, and 1 ␮M). The medium was collected and assayed for PRL concentration. The data are expressed as percentage increase over cAMPϩP4 alone (mean ϮSD). C, RTQ-PCR analysis was carried out for PRL mRNA levels in cultures treated as in A. The results show mean PRL mRNA levels (ϮSD) normalized to L19 mRNA of three independent cultures. D, HESCs were treated as in A for 48 h followed by transfection with dPRL-3000/Luc. Subsequently, the cells were maintained in the same culture conditions for 24 h. Luciferase and galactosidase assays were performed, and the results represent the mean (ϮSD) of triplicate measurements of one representative experiment. E, Primary HESCs were cultured in the presence of 8-br-cAMP, P4, DHT, and bicalutamide (Casodex; CDX) as indicated and PRL secretion determined as described above. PRL secretion was significantly different between cAMP/P4/DHT- and cAMP/P4/DHT/CDX-treated cultures (*, P Ͻ 0.05). F, HESCs, decidualized with a combination of 8-Br-cAMP, P4, and DHT for 48 h, were either mock-transfected or transfected with NT or AR siRNAs. The treatments were continued for 72 h and the supernatants assayed for PRL. The data represent
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