Analysis and identifying adhesion molecules on endometrial epithelial cells that induce and activate embryo

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This study demonstrated that ephrin A1 is expressed on human endometrial epithelial cells. On the other hand, mRNA expression of Eph A1 was detected in human embryos in the blastocyst stage, suggesting a physiological role of the Eph-ephrin system in embryo implantation. These findings indicate a possible interaction between human blastocysts and endometrial epithelial cells via the Eph-ephrin system. Because intracytoplasmic signals are induced by Eph receptors after ephrin stimulation, this system may be involved in the activation process of the human embryo during the implantation period.Also, this study demonstrated that ALCAM is expressed on human endometrial epithelial cells and blastocysts. The developing stage-specific expression on the embryo suggests that the ALCAM-ALCAM cell adhesion system is involved in an initial interaction of the embryo with maternal endometrium.Further investigation of these expression and functions of these molecules will provide new insights into the mechanisms of the initial embryo-maternal interaction.