Cytokine changes and embryo attachment in mouse endometrial cells following treated with peripheral blood mononuclear cells (PBMCs) expressing ectopic hCG, and hCG–activated PBMCs

Objective: To compare the effect of human chorionic gonadotropin (hCG)-producing peripheral blood mononuclear cells (PBMCs) and PBMCs activated by hCG in vitro and expressions of related immune genes in mouse implantation. Methods: hCG-producing PBMCs (transfected PBMC) and PBMCs activated by hCG in vitro were introduced into isolated mouse endometrial cells, while cell cultures were divided into four groups: the control, PBMC, transfected, and activated PBMC groups. The expression of studied genes (IL-lβ, IL-6, Lif, and Vegf) was evaluated and blastocyst attachment on the cocultured cells (isolated endometrial cells and PBMC cells) was monitored in all four groups. Results: Data showed that expression decreased in the PBMC group compared to the treated PBMC (transfected and activated PBMCs) and increased in transfected PBMC compared to the activated PBMC. Attachment and migration of blastocysts were dramatically enhanced in the transfected PBMC group compared to the activated PBMC group (P<0.05). Conclusions: Use of hCG-producing PBMCs (transfected PBMC) has more influence on endometrial receptivity.