The establishment of endometrial receptivity is required for successful embryo implantation during early pregnancy in many mammals. Extracellular vesicles (EVs) microRNAs (miRNAs) play an important role during embryo implantation. While their roles have been characterized in other species, the specific functions of trophoblast-derived EVs miRNAs in ovine endometrial receptivity remain undefined. In this study, we systematically investigated the effects of ovine placental trophoblast (OTR) cells-derived EVs on ovine endometrial epithelial cells (EECs) by cck-8 assay, EdU assay, cell migration assay, RT-qPCR and ultrastructural examination of apical plasma membranes. Subsequently, miRNA expression profiles of EV-treated EECs were identified and analyzed by miRNA-Seq. The results showed that OTR cells-derived EVs were taken up by EECs, enhancing the migration of EECs. EVs treatment reduced microvilli on the apical plasma membranes of EECs. The expression of genes involved in endometrial receptivity increased. OTR cells-derived EVs induced changes consistent with a receptive phenotype through coordinated cellular remodeling and gene expression changes. The miRNA-Seq results revealed 287 detectable miRNAs, including 34 with significant differential expression (20 upregulated and 14 downregulated) in EV-treated versus control EECs. The predicted target genes of these differentially expressed miRNAs were enriched in signaling pathways regulating embryo implantation and endometrial receptivity, such as MAPK, Toll-like receptor, adherens junction and focal adhesion. Our in vitro findings suggested that OTR cells-derived EVs may promote endometrial receptivity by facilitating the transformation of EECs, as indicated by receptivity-associated morphological and molecular changes. It provided novel insights for improving successful pregnancy rate in sheep.
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