3D model of the maternal-fetal interface: challenges, recent advances and beyond.

Embryo implantation is a complex and highly coordinated process that involves an intricate network of factors establishing intimate contact at the maternal-fetal interface. Knowledge of the human implantation process is compromised by both ethical issues, which do not allow the study of this process in vivo, and by the accuracy and reproducibility of in vitro models of human endometrium. Effective and reliable embryo implantation models are, therefore, necessary to mimic the molecular event cascade that occurs in vivo. 3D models are considered a new step to foster precision medicine and an advanced tool for the study of endometrial biology, endometrium associated diseases and to understand the complex mechanisms surrounding endometrium-embryo crosstalk. In this review we explore the various methods by which 3D cultures of endometrium and trophoblast can be created, exploring targets and applications of these in vitro models.