1.Sobrero, AJ, Macleod, J. The immediate postcoital test. Fertil. Steril. 1962; 13:184–189.
2.Pacey, AA, Hill, CJ, Scudamore, IW, et al. The interaction in vitro of human spermatozoa with epithelial cells from the human uterine (fallopian) tube. Hum. Reprod. 1995; 10:360–366.
3.Hunter, RHF, Petersen, HH, Greve, T. Ovarian follicular fluid, progesterone and Ca2+ ion influences on sperm release from the Fallopian tube reservoir. Mol. Reprod. Dev. 1999; 54:283–291.
4.Sun, F, Bahat, A, Gakamsky, A, et al. Human sperm chemotaxis: both the oocyte and its surrounding cumulus cells secrete sperm attractants. Hum. Reprod. 2005; 20:761–767.
5.Talbot, P. Sperm penetration through oocyte investments in mammals. Am. J. Anat. 1985; 174:331–346.
6.Drobnis, EZ, Katz, DF. Videomicroscopy of mammalian fertilization. In: Wassarman, PM, ed., Elements of Mammalian Fertilization. Boca Raton: CRC Press. 1991; 269–300.
7.Nomikos, M, Kashir, J, Swann, K, Lai, FA. Sperm PLCζ: from structure to Ca2+ oscillations, egg activation and therapeutic potential. FEBS Lett. 2013; 587:3609–3616.
8.Sutovski, P, Moreno, RD, Ramalho-Santos, J, et al. Ubiquitin tag for sperm mitochondria. Nature 1999; 402:371–372.
9.Navot, D, Scott, RT, Droesch, K, et al. The window of embryo transfer and the efficiency of human conception in vitro. Fertil. Steril. 1991; 55:114–118.
10.Duc-Goiran, P, Mignot, TM, Bourgeois, C, Ferré, F. Embryo-maternal interactions at the implantation site: a delicate equilibrium. Eur. J. Obstet. Gynecol. Reprod. Biol. 1999; 83:85–100.
11.Lessey, BA. The role of the endometrium during embryo implantation. Hum. Reprod. 2000; 15:39–50.
12.Edwards, RG. Implantation, interception and contraception. Hum. Reprod. 1994; 9:985–995.
13.Franasiak, JM, Forman, EJ, Hong, KH, et al. The nature of aneuploidy with increasing age of the female partner: a review of 15 169 consecutive trophectoderm biopsies evaluated with comprehensive chromosomal screening. Fertil. Steril. 2014; 101:656–663.
14.Adams, SM, Gayer, N, Hosie, MJ, Murphy, CR. Human uterodomes (pinopods) do not display pinocytotic function. Hum. Reprod. 2002; 17:1980–1986.
15.Nikas, G, Drakakis, P, Loutradis, D, et al. Uterine pinopodes as markers of “nidation window” in cycling women receiving exogenous oestradiol and progesterone. Hum. Reprod. 1995; 10:1208–1213.
16.Licht, P, von Volff, M, Berkholz, A, Wildt, L. Evidence for cycle-dependent expression of full-length human chorionic gonadotropin/luteinizing hormone receptor mRNA in human endometrium and decidua. Fertil. Steril. 2003; 79:718–723.
17.Nikas, G, Aghajanova, L. Endometrial pinopodes: some more understanding on human implantation? RBM Online 2002; 4:18–23.
18.Macklon, NS, Brosens, JJ. The human endometrium as a sensor of embryo quality. Biol. Reprod. 2014; 91:98.
19.Wilcox, AJ, Baird, DD, Weinberg, CR. Time of implantation of the conceptus and loss of pregnancy. N. Engl. J. Med. 1999; 340:1796–1799.
20.Bentin-Ley, U. Relevance of endometrial pinopodes for human blastocyst implantation. Hum. Reprod. 2000; 15:67–73.
21.Aplin, JD, Ruane, PT. Embryo-epithelium interactions during implantation at a glance. J. Cell Sci. 2017; 130:15–22.
22.Feng, Y, Ma, X, Deng, L, et al. Role of selectins and their ligands in human implantation stage. Glycobiology 2017; 27:385–391.
23.Genbacev, OD, Prakobphol, A, Foulk, RI, et al. Trophoblast L-selectin-mediated adhesion at the maternal-fetal interface. Science 2003; 299:405–408.
24.Soygur, B, Moore, H. Expression of syncytin 1 (HERV-W), in the preimplantation human blastocyst, embryonic stem cells and trophoblast cells derived in vitro. Hum. Reprod. 2016; 31:1455–1461.
25.Mori, M, Bogdan, A, Balassa, T, Csabai, T, Szekeres-Bartho, J. The decidua—the maternal bed embracing the embryo—maintains the pregnancy. Semin. Immunopathol. 2016; 38:635–649.
26.Liu, S, Diao, L, Huang, C, et al. The role of decidual immune cells on human pregnancy. J. Reprod. Immunol. 2017; 124:44–53.
27.Han, SW, Lei, ZM, Rao, CV. Treatment of human endometrial stroma cells with chorionic gonadotropin promotes their morphological and functional differentiation into decidua. Mol. Cell. Endocrinol. 1999; 147:7–16.
28.Yang, M, Lei, ZM, Rao, CV. The central role of human chorionic gonadotropin in the formation of human placental syncytium. Endocrinology 2003; 144:1108–1120.
29.Casper, RF. Basic understanding of gonadotropin-releasing hormone-agonist triggering. Fertil. Steril. 2015; 103:867–869.
30.Fournier, T, Guibourdenche, J, Evain-Brion, D. Review: hCGs: different sources of production, different glycoforms and functions. Placenta 2015; 36:S60–S65.
31.Sivalingam, VN, Duncan, WC, Kirk, E, Shephard, LA, Horne, AW. Diagnosis and management of ectopic pregnancy. J. Fam. Plann. Reprod. Health Care 2011; 37:231–240.
32.Tuckey, RC. Progesterone synthesis by the human placenta. Placenta 2005; 26:273–281.
33.Illingworth, PJ, Reddi, K, Smith, K, Baird, DT. Pharmacological “rescue” of the corpus luteum results in increased inhibin production. Clin. Endocrinol. (Oxf). 1990; 33:323–332.
34.Duffy, DM, Stouffer, RL. Gonadotropin versus steroid regulation of the corpus luteum of the rhesus monkey during simulated early pregnancy. Biol. Reprod. 1997; 57:1451–1460.
35.Yoshimi, T, Strott, CA, Marshall, JR, Lipsett, MB. Corpus luteum function in early pregnancy. J. Clin. Endocrinol. 1969; 29:225–230.
36.Nakajima, ST, Nason, FG, Badger, GJ, Gibson, M. Progesterone production in early pregnancy. Fertil. Steril. 1991; 55:516–521.
37.Gagliardi, CL, Goldsmith, LT, Saketos, M, Weiss, G, Schmidt, CL. Human chorionic gonadotropin stimulation of relaxin secretion by luteinized human granulosa cells. Fertil. Steril. 1992; 58:314–320.
38.Conrad, KP. Maternal vasodilation in pregnancy: the emerging role of relaxin. Am. J. Physiol. Regul. Integr. Comp. Physiol. 2011; 301:R267–R275.
39.Craciunas, L, Gallos, I, Chu, J, et al. Conventional and modern markers of endometrial receptivity: a systematic review and meta-analysis. Hum. Reprod. Update 2019; 25:202–223, doi:10.1093/humupd/dmy044.
40.Balasch, J, Fábregues, F, Creus, M, Vanrell, JA. The usefulness of endometrial biopsy for luteal phase evaluation in infertility. Hum. Reprod. 1992; 7:973–977.
41.Pantos, K, Nikas, G, Makrakis, E, et al. Clinical value of endometrial pinopodes detection in artificial donation cycles. RBM Online 2004; 9:86–90.
42.Jin, XY, Zhao, LJ, Luo, DH, et al. Pinopode score around the time of implantation is predictive of successful implantation following frozen embryo transfer in hormone replacement cycles. Hum. Reprod. 2017; 32:2394–2403.
43.Díaz-Gimeno, P, Horcajadas, JA, Martínez-Conejero, JA, et al. A genomic diagnostic tool for human endometrial receptivity based on the transcriptomic signature. Fertil. Steril. 2011; 95:50–60.
44.Hashimoto, T, Koizumi, M, Doshida, M, et al. Efficacy of the endometrial receptivity array for repeated implantation failure in Japan: a retrospective, two-centers study. Reprod. Med. Biol. 2017; 16:290–296.
45.Tan, J, Kan, A, Hitkari, J, et al. The role of the endometrial receptivity array (ERA) in patients who have failed euploid embryo transfers. J. Assist. Reprod. Genet. 2018; 35:683–692.
46.Wang, J, Xia, F, Zhou, Y, et al. Association between endometrial/subendometrial vasculature and embryo transfer outcome: a metaanalysis and subgroup analysis. J. Ultrasound Med. 2018; 37:149–163.
47.Simón, C, Martin, JC, Pellicer, A. Paracrine regulators of implantation. Baillieres Best Pract. Res. Clin. Obstet. Gynaecol. 2000; 14:815–826.
48.Aghajanova, L, Stavrèus-Evers, A, Nikas, Y, Hovatta, O, Landgren, BM. Coexpression of pinopodes and leukemia inhibitory factor, as well as its receptor, in human endometrium. Fertil. Steril. 2003; 79:808–814.
49.Lindhard, A, Bentin-Ley, U, Ravn, V, et al. Biochemical evaluation of endometrial function at the time of implantation. Fertil. Steril. 2002; 78:221–233.
50.Stavrèus-Evers, A, Aghajanova, L, Brismar, H, et al. Co-existence of heparin-binding epidermal growth factor-like growth factor and pinopodes in human endometrium at the time of implantation. Mol. Hum. Reprod. 2002; 8:765–769.
51.Daiter, E, Pampfer, S, Yeung, YG, et al. Expression of colony stimulating factor-1 in the human uterus and placenta. J. Clin. Endocrinol. Metab. 1992; 74:850–858.
52.Licht, P, Russu, V, Lehmeyer, S, et al. Intrauterine microdialysis reveals cycle-dependent regulation of endometrial insulin-like growth factor binding protein-1 secretion by human chorionic gonadotrophin. Fertil. Steril. 2002; 78:252–258.
53.Slayden, OD, Rubin, JS, Lacey, DL, Brenner, RM. Effects of keratinocyte growth factor in the endometrium of rhesus macaques during the luteal-follicular transition. J. Clin. Endocrinol. Metab. 2000; 85:275–285.
54.Tei, C, Maruyama, T, Kuji, N, et al. Reduced expression of alphavbeta3 integrin in the endometrium of unexplained infertility patients with recurrent IVF-ET failures: improvement by danazol treatment. J. Assist. Reprod. Genet. 2003; 20:13–20.
55.Bischof, P. Endocrine, paracrine and autocrine regulation of trophoblastic metalloproteinases. Early Pregnancy 2001; 5:30–31.
56.Xu, P, Wang, YL, Zhu, SJ, et al. Expression of matrix metalloproteinase-2, -9, and -14, tissue inhibitors of metalloproteinase-1, and matrix proteins in human placenta during the first trimester. Biol. Reprod. 2000; 62:988–994.
57.Nguyen, HPT, Simpson, RJ, Salamonsen, LA, Greening, DW. Extracellular vesicles in the intrauterine environment: challenges and potential functions. Biol. Reprod. 2016; 95:109.
58.Gross, N, Kropp, J, Khatib, H. MicroRNA signaling in embryo development. Biology (Basel) 2017; 6:34.
59.Chegini, N, Tang, XM, Dou, Q. The expression, activity and regulation of granulocyte macrophage-colony stimulating factor in human endometrial epithelial and stromal cells. Mol. Hum. Reprod. 1999; 5:459–466.
60.Paiva, P, Hannan, NJ, Hincks, C, et al. Human chorionic gonadotrophin regulates FGF2 and other cytokines produced by human endometrial epithelial cells, providing a mechanism for enhancing endometrial receptivity. Hum. Reprod. 2011; 26:1153–1162.
61.Sjöblom, C, Roberts, CT, Wikland, M, Robertson, SA. Granulocyte-macrophage colony-stimulating factor alleviates adverse consequences of embryo culture on fetal growth trajectory and placental morphogenesis. Endocrinology 2005; 146:2142–2153.
62.Robertson, SA, Roberts, CT, Farr, KL, Dunn, AR, Seamark, RF. Fertility impairment in granulocyte-macrophage colony-stimulating factor-deficient mice. Biol. Reprod. 1999; 60:251–261.
63.Perez-Garcia, V, Fineberg, E, Wilson, R, et al. Placentation defects are highly prevalent in embryonic lethal mouse mutants. Nature 2018; 555:463–468.
64.Hemberger, M, Hanna, CW, Dean, W. Mechanisms of early placental development in mouse and humans. Nat. Rev. Genet. 2019; 21:27–43. doi:10.1038/s41576-019–0169-4.
65.Noyes, RW, Hertig, AT, Rock, J. Dating the endometrial biopsy. Fertil. Steril. 1950; 1:3–25.
66.Pijnenborg, R, Vercruysse, L, Hanssens, M. The uterine spiral arteries in human pregnancy: facts and controversies. Placenta 2006; 27:939–958.
67.Malassine, A, Frendo, J-L, Evain-Brion, D. A comparison of placental development and endocrine functions between the human and mouse model. Hum. Reprod. Update 2003; 9:531–539.
68.Jarvela, IY, Ruokonen, A, Tekay, A. Effect of rising hCG levels on the human corpus luteum during early pregnancy. Hum. Reprod. 2008; 23:2775–2781.
69.Gamliel, M, Goldman-Wohl, D, Isaacson, B, et al. Trained memory of human uterine NK cells enhances their function in subsequent pregnancies. Immunity 2018; 48:951–962.
70.Hanna, J, Goldman-Wohl, D, Hamani, Y, et al. Decidual NK cells regulate key developmental processes at the human fetal-maternal interface. Nat. Med. 2006; 12:1065–1074.
71.Kalkunte, SS, Mselle, TF, Norris, WE, et al. Vascular endothelial growth factor C facilitates immune tolerance and endovascular activity of human uterine NK cells at the maternal-fetal interface. J. Immunol. 2009; 182:4085–4092.
72.Klentzeris, LD, Bulmer, JN, Warren, MA, et al. Lymphoid tissue in the endometrium of women with unexplained infertility: morphometric and immunohistochemical aspects. Hum. Reprod. 1994; 9:646–652.
73.Hunt, JS, Miller, L, Platt, JS. Hormonal regulation of uterine macrophages. Dev. Immunol. 1998; 6:105–110.
74.Bulmer, JN, Williams, PJ, Lash, GE. Immune cells in the placental bed. Int. J. Dev. Biol. 2010; 54:281–294.
75.Abrahams, VM, Kim, YM, Straszewski, SL, Romero, R, Mor, G. Macrophages and apoptotic cell clearance during pregnancy. Am. J. Reprod. Immunol. 2004; 51:275–282.
76.Jiang, TT, Chaturvedi, V, Ertelt, JM, et al. Regulatory T cells: new keys for further unlocking the enigma of fetal tolerance and pregnancy complications. J. Immunol. 2014; 192:4949–4956.
77.Fisher, SJ. Why is placentation abnormal in preeclampsia? Am. J. Obstet. Gynecol. 2015; 213:S115–S122.
78.Hunt, JS, Petroff, MG, McIntire, RH, Ober, C. HLA-G and immune tolerance in pregnancy. FASEB J. 2005; 19:681–693.
79.Helige, C, Ahammer, H, Hammer, A, et al. Trophoblastic invasion in vitro and in vivo: similarities and differences. Hum. Reprod. 2008; 23:2282–2291.
80.Maltepe, E, Fisher, SJ. Placenta: the forgotten organ. Annu. Rev. Cell Dev. Biol. 2015; 31:523–552.
81.Chetty, M, Duncan, WC. Investigation and management of recurrent miscarriage. Obstet. Gynecol. Reprod. Med. 2015; 25:31–36.
82.Lucas, ES, Dyer, NP, Murakami, K, et al. Loss of endometrial plasticity in recurrent pregnancy loss. Stem Cells 2016; 34:346–356.
83.Sotiriadis, A, Makrigiannakis, A, Stefos, T, Paraskevaidis, E, Kalantaridou, SN. Fibrinolytic defects and recurrent miscarriage: a systematic review and meta-analysis. Obstet. Gynecol. 2007; 109:1146–1155.