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Development and Utilization of Human Decidualization Reporter Cell Line Uncovers New Modulators of Female Fertility

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Development and Utilization of Human Decidualization Reporter Cell Line Uncovers New Modulators of Female Fertility Development and utilization of human decidualization reporter cell line uncovers new modulators of female fertility Meade Hallera,1, Yan Yina,1, and Liang Maa,2 aDepartment of Internal Medicine, Division of Dermatology, Washington University in St. Louis, St. Louis, MO 63110 Edited by R. Michael Roberts, University of Missouri, Columbia, MO, and approved August 19, 2019 (received for review May 2, 2019) Failure of embryo implantation accounts for a significant percent- Decidualization involves the rapid proliferation, then differ- age of female infertility. Exquisitely coordinated molecular pro- entiation of fibroblast-like endometrial stromal cells into epithelioid- grams govern the interaction between the competent blastocyst like decidual cells, some of which become large and polyploid or and the receptive uterus. Decidualization, the rapid proliferation multinuclear. These cells become part of the decidual tissue that and differentiation of endometrial stromal cells into decidual cells, surrounds the implanting conceptus (2, 9). The maternal de- is required for implantation. Decidualization defects can cause cidual tissue plays a crucial role in the establishment of preg- poor placentation, intrauterine growth restriction, and early nancy (11, 12). Accompanying the transformation of uterine parturition leading to preterm birth. Decidualization has not yet stromal cells to decidual cells are changes occurring in the en- been systematically studied at the genetic level due to the lack of a dometrium that include extensive extracellular matrix remodel- suitable high-throughput screening tool. Herein we describe the ing, vascular remodeling, angiogenesis, and apoptosis. While generation of an immortalized human endometrial stromal cell line these are happening, the conceptus enlarges and placental de- that uses yellow fluorescent protein under the control of the prolactin velopment occurs (2, 9). In addition to implantation defects, ex- promoter as a quantifiable visual readout of the decidualization perimental evidence suggests that early decidualization defects response (hESC-PRLY cells). Using this cell line, we performed a can lead to defects in placentation, intrauterine fetal growth, and genome-wide siRNA library screen, as well as a screen of 910 small parturition (13). A complex network involving transcription fac- CELL BIOLOGY molecules, to identify more than 4,000 previously unrecognized genetic tors, morphogens, cytokines, and their respective signaling path- and chemical modulators of decidualization. Ontology analysis ways is believed to regulate decidualization. Decidualization revealed several groups of decidualization modulators, including requires the continued presence of progesterone produced largely many previously unappreciated transcription factors, sensory re- by the corpora lutea of the ovary (2, 9) and this response is en- ceptors, growth factors, and kinases. Expression studies of hits hanced by the presence of cyclic adenosine monophosphate revealed that the majority of decidualization modulators are acutely (cAMP) (14, 15) and estrogen (16). Although the decidual re- sensitive to ovarian hormone exposure. Gradient treatment of sponse is irrefutably dependent on the presence of progesterone, exogenous factors was used to identify EC50 values of small-molecule hits, as well as verify several growth factor hits identified by the prospective clinical trials of exogenous progesterone supplemen- siRNA screen. The high-throughput decidualization reporter cell tation in pregnant women with a history of recurrent pregnancy line and the findings described herein will aid in the development loss showed little to no effect on the subsequent rate of live births of patient-specific treatments for decidualization-based recurrent (17). This suggests that hormone supplementation may need to be pregnancy loss, subfertility, and infertility. administered prior to the implantation phase to have any effect, and that loss of clinically recognized pregnancies may be more fertility | decidualization | obstetrics | gynecology Significance s many as 15% of couples and ∼72 million females world- Awide have impaired fertility (1). Additionally, 15% of clinically Up to 15% of couples experience infertility. Implantation must recognized pregnancies end in miscarriage (2), with approximately occur in order for the pregnancy hormone hCG to be detected, half of all women whose embryos implant 11 or more days after and thus many pregnancies go unrecognized before being lost ovulation proceeding to miscarry (3). After clinical investigations, due to implantation failure. Decidualization is a complex dif- many of the causes of impaired female fertility were found to ferentiation process during which the uterine lining grows and be identifiable pathologies, including improper ovarian function. dramatically changes form in response to ovarian hormone stimulus, and this process is required for successful implanta- However, ∼10% remained unexplained (4, 5). It is suspected that tion. By developing and utilizing a new reporter cell line, the in some infertile women, fertilization is successfully attained but present study systematically uncovers more than 4,000 genetic pregnancies are immediately lost during the implantation phase (6, and chemical modulators of the human decidual response in 7). These pregnancies are clinically unrecognized, since the hor- the hopes of catalyzing new treatments for female infertility, mone used to diagnose pregnancy, human chorionic gonadotropin subfertility, and recurrent pregnancy loss. (hCG), is only detectable after the implantation phase (8). The ovary, embryo, and endometrium undergo complex changes Author contributions: M.H., Y.Y., and L.M. designed research; M.H. and Y.Y. performed after ovulation. These changes support the onset of implantation research; M.H., Y.Y., and L.M. analyzed data; and M.H., Y.Y., and L.M. wrote the paper. and thus the successful establishment of pregnancy (2, 9, 10). If the The authors declare no conflict of interest. ovary fails to produce correct and sufficient levels of signals, or if This article is a PNAS Direct Submission. the uterus fails to respond to those signals, the success of the Published under the PNAS license. implantation process and the overall health of any achieved 1M.H. and Y.Y. contributed equally to this work. pregnancy can be severely impacted. In particular, the decidualization 2To whom correspondence may be addressed. Email: [email protected]. process, a complex and rapid endometrial remodeling response, This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. is a critical regulator of successful implantation and subsequent 1073/pnas.1907652116/-/DCSupplemental. placental formation and function (2, 9, 10). First published September 9, 2019. www.pnas.org/cgi/doi/10.1073/pnas.1907652116 PNAS | September 24, 2019 | vol. 116 | no. 39 | 19541–19551 Downloaded by guest on October 4, 2021 dependent on the ability of the uterus to respond to progesterone construct containing a cytomegalovirus (CMV) constitutively ac- rather than absolute hormone levels. tive promoter flanked by loxP sites that sits between YFP and an Since it is not possible to directly study human endometrial exogenous shortened version of the hormone-sensitive PRL pro- stromal cell decidualization in vivo due to ethical reasons, cell moter (Fig. 1A) was therefore used. Flanking the entire cassette culture models have been developed to study decidualization in are insulator sites, boundary elements that prevent position effect vitro. Pure populations of endometrial fibroblasts of menstrual variegation (35). This construct allows YFP to be expressed con- cycling women (human endometrial stromal cells, hESCs) have stitutively in any construct-containing cell via the CMV promoter been isolated and cultured in vitro (18–22). Moreover, an im- and then, upon treatment with cre-recombinase enzyme, allows mortalized telomerase-expressing endometrial stromal cell line excision of the CMV promoter such that YFP is instead under the has been developed (23), which has already been of great use to control of the hormone-sensitive PRL promoter. The targeting study human decidualization (24–28). Similar to hESCs, these construct was thus nucleofected into immortalized hESCs. YFP- immortalized cells require progesterone to initiate the decidualization expressing, successfully nucleofected cells were then isolated response (29), which can be enhanced by the addition of cAMP by FACS, briefly propagated and then nucleofected with cre- analogs (dbcAMP, 8-Br-cAMP), estrogen (16), and prostaglandin recombinase–coding plasmid (Fig. 1B). The cells thereafter no E2 (14, 15, 30) as measured by increased gene expression of longer expressing YFP represent the population of immortalized decidualization markers, such as insulin-like growth factor binding hESCs with YFP under control of the PRL rather than CMV protein 1 (IGFBP1), forkhead box protein A1 (FOXO1A), and promoter, and these cells were isolated using several subsequent prolactin (PRL). rounds of FACS. While immortalized hESCs represent an exceptional tool to Due to differences in insertion sites and therefore likely dif- study decidualization in their own right, the endpoint requires ferences in hormone responsiveness, these newly derived hESC- the extractions of RNA or protein from large quantities of cells, PRLY cells were then plated clonally as single cells and allowed and laborious subsequent downstream methods
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