TGFβ superfamily signaling and uterine decidualization
© The Author(s). 2017
Received: 15 July 2017
Accepted: 2 October 2017
Published: 13 October 2017
Decidualization is an intricate biological process where extensive morphological, functional, and genetic changes take place in endometrial stromal cells to support the development of an implanting blastocyst. Deficiencies in decidualization are associated with pregnancy complications and reproductive diseases. Decidualization is coordinately regulated by steroid hormones, growth factors, and molecular and epigenetic mechanisms. Transforming growth factor β (TGFβ) superfamily signaling regulates multifaceted reproductive processes. However, the role of TGFβ signaling in uterine decidualization is poorly understood. Recent studies using the Cre-LoxP strategy have shed new light on the critical role of TGFβ signaling machinery in uterine decidualization. Herein, we focus on reviewing exciting findings from studies using both mouse genetics and in vitro cultured human endometrial stromal cells. We also delve into emerging mechanisms that underlie decidualization, such as non-coding RNAs and epigenetic modifications. We envision that future studies aimed at defining the interrelationship among TGFβ signaling circuitries and their potential interactions with epigenetic modifications/non-coding RNAs during uterine decidualization will open new avenues to treat pregnancy complications associated with decidualization deficiencies.
Major roles of TGFβ superfamily in reproduction and development
Main signaling component
TGFβs, GDF9, BMP2, BMP4, BMP7
BMP15, activin, inhibin, AMH
BMPR1A, BMPR1B, SMAD2/3, SMAD4
TGFβs, BMP7, BMPR1B, BMPR2, SMAD1, SMAD6
TGFβ1, ACVR1, BMPR1A, TGFBR1, BMP7
BMP2, SMAD1/5/4, SMAD2/3, ACVR1, BMPR1A, BMPR2, FST, LEFTY
TGFβs, BMP2, BMP4, BMP5, BMP6, BMP7, BMP8, INHBA, INHBB, GDF1, LEFTY, NODAL, AMH, SMAD1, SMAD2, SMAD4, SMAD5, SMAD6, SMAD7, ACVRL1, ACVR1, BMPR1A, ACVR1B, TGFBR1, BMPR1B, TGFBR2, ACVR2/2B, AMHR2, BMPR2
Reproductive tract development
TGFBR1, AMH, AMHR2, ACVR1, BMPR1A, SMAD1/5/8, SMAD4
It is important to note that, in addition to its role in female reproductive function, TGFβ signaling also regulates the development and function of the male reproductive system such as testis development . However, this topic is beyond the scope of this review.
Uterine decidualization: A critical event during pregnancy
A successful pregnancy relies on a delicate interplay among hormonal, cellular, and molecular signals. Decidualization, a process where extensive remodeling of the endometrium occurs to set the stage for embryo development, is a key event in pregnancy in some mammals including mice and humans. Despite its critical role in pregnancy, the timing of decidualization differs among species. Decidualization is induced by attachment of the blastocyst to uterine luminal epithelium in mice, whereas differentiation of the estradiol (E2)-primed endometrium occurs following the postovulatory rise of progesterone (P4) during the secretory phase of menstrual cycle in humans [33, 34]. During decidualization, dramatic cellular and molecular changes occur, as endometrial stroma cells (ESCs) transform from fibroblast-like cells into large polygonal cells that are rich in cytoplasmic glycogen and lipid droplets . Stromal cell polyploidy is a unique phenomenon that occurs during decidual cell differentiation following blastocyst implantation . Decidual cell-secreted factors include prolactin (PRL) and insulin-like growth factor binding protein-1 (IGFBP-1) that are key regulators of decidualization and are widely used as markers of decidualization [36, 37].
Ovarian steroid hormones, E2 and P4, play fundamental roles in implantation of blastocysts and uterine decidualization . It has been increasingly recognized that progesterone receptor (PGR) signaling is of paramount importance for blastocyst implantation, uterine decidualization, and pregnancy maintenance [38, 39]. P4, via binding to its cognate receptor, activates a complex array of molecular events mediated by Indian hedgehog (IHH) , BMP2 , nuclear receptor subfamily 2 group F member 2 (NR2F2/COUP-TFII) , Wingless-type MMTV integration site family (WNT) 4 , and HAND2  during implantation and/or decidualization. Examples of additional PGR-associated regulators of endometrial function include forkhead box O1 (FOXO1) , CCAAT/enhancer-binding protein beta (CEBPB) , and homeobox A10 (HOXA10) [47, 48]. Of note, immune cells, particularly uterine natural killer (uNK) cells, can be recruited to regulate important events such as decidual angiogenesis during pregnancy .
In the following sections, we review literature that documents a role for TGFβ superfamily signaling in uterine decidualization, with a focus on major findings from genetically modified mouse models and cell culture studies using human ESCs.
TGFB superfamily signaling regulates uterine decidualization
Evidence from mouse models
TGFβ superfamily ligands
The role of TGFβ ligands in uterine decidualization in mice is not clear. Existing evidence suggests that TGFβ signaling pathway may be involved in regression of the uterine decidua in the rat, as TGFβ1, TGFβ2, TGFβ3 are highly expressed during the regression of the decidua basalis, accompanied by an upregulation of expression of phosphorylated SMAD2 . In vitro studies using rat decidual cells in culture revealed a role of TGFβ1 in inducing cellular apoptosis potentially through activation of SMAD2 and downregulation of AKT and X-linked inhibitor of apoptosis (XIAP) . TGFβ2 and TGFβ3 also promote apoptosis in cultured decidual stromal cells potentially through regulation of AKT and XIAP expression .
Compelling evidence supporting an essential role for BMPs in uterine decidualization derives from studies using conditional deletion of Bmp2 in the uteri of mice . Loss of BMP2 in the uterus renders the mouse infertile and the uterus is unable to decidualize, owing to the dysregulation of multiple genes including Wnt4/6, FK-506 binding proteins (Fkbps), and prostaglandin synthase2 (Ptgs2) . Recently, conditional deletion of Bmp7 induces implantation defects and dysregulation of decidual genes including Bmp2, Ptgs2, Wnt4, and epiregulin (Ereg) . However, Bmp7 cKO mice respond normally to artificial decidualization stimuli . Results of in vitro culture studies using undifferentiated uterine stromal cells from pregnant mice reinforce the role of BMP2-WNT4 signaling in decidualization . In contrast to BMPs, the role of activins in uterine decidualization in mice remains elusive. However, a recent study has shown that follistatin (FST), an antagonist of activin, is required for blastocyst implantation and normal uterine decidualization .
NODAL, a key regulator of embryogenesis, is implicated in several pregnancy-associated events, including implantation of blastocyst and uterine decidualization . Deletion of Nodal in the mouse uterus using Pgr-Cre leads to fertility defects, accompanied by fetal loss and preterm birth due to intrauterine growth restriction and malformation of the decidua basalis . Of note, the NODAL antagonist, LEFTY, appears to inhibit uterine decidualization. Artificial decidualization of mice promotes the expression of LEFTY . However, overexpression of LEFTY in the uteri of pregnant mice compromises artificial decidualization .
The function of TGFβ superfamily signaling receptors in uterine decidualization is poorly understood, due in part to the promiscuity and redundancy of the receptor signaling. The application of Cre-LoxP approach to circumvent embryonic lethality of the receptor null mice greatly facilitates the dissection of the functional roles of TGFβ receptor signaling in the uterus.
BMPs generally signal through activin A receptor type 1 (ACVR1, also known as ALK2), BMP receptor type 1A (BMPR1A, known as ALK3), BMPR1B (known as ALK6), and BMP type 2 receptor (BMPR2). Conditional ablation of ACVR1 in the mouse uterus causes infertility, with delayed embryo invasion into the endometrium and defective implantation . Expression of uterine stromal cell differentiation markers including Prl8a2 and Prl3c1 and the activity of alkaline phosphatase (ALP) are reduced in Acvr1 cKO mice. Gene profiling using artificially decidualized uterine tissues identified CEBPB as a critical BMP downstream target . Conditional deletion of Bmpr1a in the uteri of mice using Pgr-Cre leads to sterility . Bmpr1a Pgr-Cre cKO mice manifest defective implantation and decidualization, with reduced expression of implantation-associated genes such as Cox2 and Wnt4. Enhanced E2 signaling is evident in Bmpr1a Pgr-Cre cKO mice, where the expression levels of ER and its downstream signaling targets are higher than for controls . Thus, BMPR1A-mediated signaling is critical for implantation and decidualization in mice. In contrast, conditional deletion of Bmpr1a using Amhr2-Cre leads to subfertility and a prolonged diestrous phase, without compromising decidualization . Since Amhr2-Cre does not delete genes in uterine epithelia compared with Pgr-Cre, this finding suggests a potential involvement of epithelial BMPR1A in uterine decidualization. Knocking out of Bmpr1b results in infertility, accompanied by impaired cumulus expansion and uterine gland formation . The uterine function of the type 2 receptor for BMPs, BMPR2, has been investigated via the creation of Bmpr2 cKO mice using Pgr-Cre . Bmpr2 cKO mice are sterile, with intrauterine growth retardation and hemorrhaging observed in developing conceptuses (embryo/fetus and placenta) . Unlike Bmpr1a Pgr-Cre cKO mice, the uteri of Bmpr2 cKO mice are able to decidualize, although to a lesser extent than controls . Interestingly, the number of uNK cells is substantially reduced in the decidua basalis of pregnant Bmpr2 cKO mice . Findings from Bmpr2 cKO mice indicate that BMPR2-meidated signaling is not fully responsible for uterine decidualization.
In contrast to the reproductive phenotypes manifested by the aforementioned BMP signaling related mouse models, conditional ablation of TGFβ receptor 1 (TGFBR1, known as ALK5) leads to prominent defects in the female reproductive tract . While the formation of myometrial layers is disrupted in Tgfbr1 Amhr2-Cre cKO mice, uterine decidualization can be induced artificially . In contrast, Tgfbr1 Pgr-Cre cKO mice display defects in multiple pregnancy-related events including implantation, development of trophoblast cells, recruitment of uNKs, and uterine vascularization . Of note, artificial decidualization occurs despite impaired recruitment of uNKs to the decidua and dysregulated expression of NK cell associated genes such as interleukin 15 (Il-15) .
Mouse models to study TGFβ superfamily signaling in uterine function
Tgfbr1 Amhr2-Cre cKO
Disrupted myometrial formation with occurrence of artificial decidualization
Tgfbr1 Pgr-Cre cKO
Defective placentation, impaired recruitment of uNK cells, with occurrence of artificial decidualization
Bmp2 Pgr-Cre cKO
Infertility with loss of decidualization
Bmp7 Pgr-Cre cKO
Defective implantation with normal response to artificial decidualization stimuli
Fst Pgr-Cre cKO
Defective uterine receptivity and decidualization
Nodal Pgr-Cre cKO
Malformation of decidua basalis with fetal loss and preterm birth
Acvr1 Pgr-Cre cKO
Infertility with defective implantation and decidualization
Acvr1b Pgr-Cre cKO
Defective placental development but normal occurrence of implantation and decidualization
Bmpr1a Pgr-Cre cKO
Impaired implantation and decidualization
Bmpr1a Amhr2-Cre cKO
Subfertility with prolonged diestrous phase and occurrence of decidualization
Infertility, impaired expansion of cumulus cells of oocytes and uterine gland formation
Bmpr2 Pgr-Cre cKO
Infertility, defective decidual vascularization and decidualization
Impaired artificial decidualization
Smad1/5/4 Amhr2-Cre cKO
Defective oviductal and myometrial development, impaired implantation and decidualization
SMADs are intracellular mediators of canonical TGFβ signaling. Recent studies begin to facilitate understanding of the role of SMAD proteins in the uterus. Artificial decidualization is moderately impaired in Smad3 null mice . A potential overlapping function between SMAD2 and SMAD3 in decidualization has been revealed; in vitro knockdown of Smad2 using an siRNA approach reduces expression of prolactin-related protein in Smad3 −/− decidual cells . As a central mediator of the canonical TGFβ signaling pathway, SMAD4 transduces signals of both TGFβ/activin and BMP family members. However, the role of SMAD4 in the uterus remains elusive. Uterine specific ablation of SMAD4 is expected to provide insight into its role. The role of BMP-associated SMADs in the uterus has been investigated. Conditional deletion of Smad1 and Smad5 using Amhr2-Cre causes fertility defects and the development of ovarian granulosa cell tumors, with no uterine phenotype reported . Interestingly, triple deletion of Smad1, Smad5, and Smad4 using the same Cre leads to defects in oviductal and myometrial development and blastocyst implantation . Furthermore, expression of genes associated with oviductal development and cell differentiation is impaired in Smad1/5/4 Amhr2-Cre cKO mice . Smad1/5/4 Amhr2-Cre cKO mice also show partially compromised decidualization, which may be caused by dysregulation of decidualization-associated genes such as Bmp2, Wnt4, and Ptgs2 . These studies suggest a complex role of SMAD signaling in uterine decidualization.
Evidence from human studies
Supporting a role for TGFβ signaling in uterine decidualization in humans, the expression of a number of TGFβ family ligands including BMP2, BMP4, BMP7, GDF5, GDF8, and GDF11 is detectable in the secretory phase human endometrium and cultured human ESCs . Decidual cells also express BMP2, GDF5, and TGFβ1 . Although it has been long studied, the functional role of TGFβ1 in human decidualization remains controversial. It has been shown that TGFβ1 reduces the expression of PRL, IGFBP-1, and tissue factor (TF) in human ESCs, suggesting an inhibitory role of TGFβ1 in decidualization . Further studies revealed the involvement of SMAD-dependent and SMAD-independent pathways in TGFβ1 inhibition of PRL and IGFBP-1 expression, respectively . Moreover, TGFβ1 inhibits the expression of PGR and WNT antagonist Dickkopf-1 (DKK) in differentiated ESCs via the respective SMAD-dependent and SMAD-independent mechanisms . In contrast to the inhibitory role of TGFβ1 in decidualization, other investigators have demonstrated that the secretion of TGFβ1 increases during in vitro decidualization of human ESCs, and that recombinant TGFβ1 promotes the decidualization process [70, 73, 74]. The reason for the contradictory effects of TGFβ1 on ESC decidualization is not known, but may be associated with differences in experimental conditions utilized in different studies.
Strong evidence supports the implication of BMP signaling in human ESC decidualization. The aforementioned role of BMP2 in uterine decidualization in mice has been reinforced by studies using in vitro cultured human ESCs, where secretion of BMP2 is increased during decidualization and recombinant BMP2 protein stimulates the decidual response . A similar BMP2-WNT4 signaling mechanism may operate during decidualization in human and mouse ESCs ; downregulation of WNT4 hampers BMP2-induced differentiation while overexpression of WNT4 promotes cell differentiation . The receptors that mediate BMP2 signaling during ESC decidualization have not been well defined. However, knockdown of expression of the BMP type 1 receptor, ACVR1, in human ESCs impairs the expression of decidualization markers . Further experiments using chromatin immunoprecipitation revealed the importance of the BMP-ACVR1-SMAD1/5-CEBPB-PGR signaling axis in human ESC decidualization . Unlike BMP2, BMP7 reduces E2/P4-induced expression of IGFBP1 mRNA in human ESCs in culture, suggesting an inhibitory role of BMP7 in ESC decidualization . This finding seems to contradict results from the mouse model in which loss of BMP7 affects decidual gene expression . Expression analysis has shown that the levels of BMPR1A, BMPR1B and BMPR2 are lower in leiomyoma-associated endometrium that secretes high levels of TGFβ3 versus normal endometrium . Furthermore, treatment of ESCs with TGFβ3 reduces the expression of BMP receptors, suggesting that TGFβ signaling may be intertwined with BMP signaling in regulating functions of uterine decidual cells . Further experiments are needed to determine potential interactions between TGFβs and BMPs during uterine decidualization.
There is also considerable evidence for the involvement of activins in human decidualization . Activin receptors in the stromal and endothelial cells of human endometria are highly expressed during the early secretory phase of the menstrual cycle and early pregnancy . Furthermore, activin A dose-dependently increases the production of PRL, and the effect can be attenuated by follistatin in decidualizing ESCs . In combination with the fact that decidual cells secrete dimeric activin A, these findings point to an autocrine/paracrine action of activin A in human decidualization . Furthermore, a potential link between activin A and the production of matrix metalloproteinases and IL11 in the mechanism of decidualization has been suggested [81, 82]. In addition, concentrations of activin B in serum are lower in ectopic pregnancies containing less decidualized stroma versus intrauterine pregnancies; and decidualization of uterine stromal cells is accompanied by upregulation of expression of inhibin/activin beta-B . Thus, both activins A and B are plausible regulators of decidualization in human ESCs.
Consistent with the inhibitory role of LEFTY in uterine decidualization in mice, overexpression of LEFTY1 in human ESCs impairs their secretion of PRL and IGFBP1 . Studies using human uterine fibroblast cells also support an inhibitory function of LEFTY in uterine decidualization, with the involvement of key transcription factors, FOXO1 and ETS proto-oncogene 1 (ETS1) . These findings led to the suggestion that LEFTY may serve as a molecular switch controlling stromal cell differentiation and decidual reprogramming during early pregnancy .
Conclusion and future directions
The application of Cre-LoxP technology has accelerated the generation of new knowledge and understanding of the functions of TGFβ signaling in decidualization, a key event associated with implantation and development of blastocysts/conceptuses (Fig. 1b). Despite that advancement in knowledge, the functional signaling circuitries among ligands, receptors, and SMADs remain to be elucidated. Future studies are warranted to not only define the signaling landscape, but also unravel the functional interactions among TGFβ signaling circuitries. For instance, it has been reported that PI3K/AKT, ERK, and JNK are regulators of decidualization [85–88] and some studies have suggested that PI3K/AKT signaling activities are downregulated during decidualization [87, 88]. Little is known about the role of TGFβ-activated kinase 1 (TAK1) in uterine decidualization. It is also not clear whether those non-canonical TGFβ signaling elements are also activated by TGFβ superfamily proteins in the context of uterine decidualization (Fig. 1b). If so, how are their functions orchestrated to fulfill the program of differentiation of endometrial cells? In addition, it remains challenging to delineate the functional ligands-receptor-SMAD/non-SMAD pathways and signaling crosstalk on the roadmap to decidualization.
Non-coding RNAs and epigenetic modifications are emerging regulators of uterine decidualization. MicroRNAs (miRNAs), non-coding RNAs that are ~22 nt long transcript, play important roles in post-transcriptional gene regulation . Recent findings point to a likely role for non-coding RNAs in blastocyst implantation, uterine development, decidualization, and myometrial function [90–93]. For example, the levels of miR-542-3p are lower in decidualizing versus normal human ESCs, and overexpression of miR-542-3p inhibits the expression of IGFBP1, PRL, and WNT4, suggesting an inhibitory role of miR-542-3p in decidualization . It has also been reported that miR-181b-5p regulates the expression of cell migration associated proteins during decidualization . Although TGFβ signaling regulates miRNA biosynthesis/expression [96–98], little is known about interactions between TGFβ signaling and miRNAs in the regulation of decidualization. Future efforts are needed to gain a comprehensive understanding of the role of TGFβ-associated non-coding RNAs in uterine decidualization.
DNA/histone methylation appears to be involved in uterine decidualization. DNA methylation at cytosines represents a common epigenetic modification of genes. Our understanding of DNA methylation in decidualization is just beginning . Recent studies have shown that DNA methyltransferase 1 (Dnmt1) and Dnmt3a are expressed in mouse ESCs during early pregnancy . Treatment of mice with the DNA methyltransferase inhibitor 5-aza-2-deoxycytodine (5-aza-dC) during the peri- or postimplantation period impairs uterine decidualization . Histone methylation, an important post-translational modification, adds methyl groups to specific amino acids of histones. Enhancer of zeste homolog 2 (EZH2), a histone methyltransferase, represses gene transcription by tri-methylation of lysine 27 on H3 histones (H3K27me3) . The expression of EZH2 mRNA and protein is reduced in cultured human decidualizing cells induced by 8-bromo-cAMP and/or medroxyprogesterone acetate (MPA), as is associated with loss of H3K27me3 in the proximal promoters of PRL and IGFBP1 . Meanwhile, a transcriptionally permissive chromatin seems to be established due to the loss of H3K27me3 and enrichment in acetylation of H3K27 . The outcome of such a chromatic remodeling is the phenotypic switch of ESCs from proliferation to decidualization . As further evidence, chromobox 4 (CBX4)/ring finger protein 2 (RNF2/Ring1B) containing polycomb repressive complex 1 (PRC1) is an important regulator of decidualization in mice . Of note, TGFβ superfamily members regulate EZH2 expression . Therefore, it is imperative to determine whether TGFβ signaling and epigenetic programming are linked to event responsible for uterine decidualization during pregnancy.
In summary, further understanding TGFβ superfamily signaling associated cellular, molecular, and epigenetic mechanisms underlying decidualization is needed. In particular, deciphering the interrelationship among TGFβ signaling circuitries and their potential interactions with epigenetic modifications/non-coding RNAs may prove useful in developing novel therapeutic strategies for the treatment of uterine disorders associated with deficiencies in decidualization.
The authors sincerely thank Drs. Robert C. Burghardt and Fuller W. Bazer for critical reading of this manuscript. Dr. Yang Gao and Ms. Xin Fang are also acknowledged for helpful feedback.
Research in the related field in the Li laboratory is supported by the Eunice Kennedy Shriver National Institute of Child Health & Human Development of the National Institutes of Health under award number R01HD087236 (to QL).
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QL contributed to the concept of this manuscript. NN wrote the first draft and QL revised it. Both authors approved the final manuscript.
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