Embryonic Regulation of Integrins β3,α 4, and α1 in Human Endometrial Epithelial Cells in Vitro1

In the present study, we examined the embryonic regulation ofβ 3 integrin in human endometrial epithelial cells (EEC) at the protein level and analyzed putative embryonic factors responsible for this regulation. The model employed is based on a clinical in vitro fertilization program in which single human embryos were cocultured with EEC until blastocyst stage and then transferred back to the uterus. After embryo transfer, EEC wells were divided according to the embryonic status reached: EEC with embryos that achieved the blastocyst stage, EEC with arrested embryos, and EEC without embryos. Immunostaining for β3 was positive in plasma membrane of EEC. Flow cytometry showed a mean percentage ofβ 3-stained cells of 24.1 ± 5.7 in EEC cocultured with embryos that achieved the blastocyst stage (n = 13) vs. 9.5 ± 1.6 (P < 0.05) in those EEC cultured with arrested embryos (n = 12). Immunostaining for α1 and α4 integrins was negative in EEC monolayers studied, regardless of the presence or absence of embryos, and...

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