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In vitro studies on the last stage of rabbit blastocyst implantation



In vitro studies on the last stage of rabbit blastocyst implantation



Japanese Journal of Fertility & Sterility 34(4): 15-23



An in vitro experimental model of rabbit blastocyst implantation was carried out to study the interactions between blastocysts and endometrial cells. Blastocysts obtained 6 1/2 days after mating were placed on endometrial cells sheets prepared prior to the addition of blastocysts. After 60 or 72 hours in culture, the blastocysts and the endometrial cells were studied morphologically and the following results were obtained. 1) After 60 hours in culture, the zona pellucida of the blastocysts was attached firmly to the endometrial cells covering the protuberant structures at several discrete points and made direct contact with collagen fibrils in parts. 2) After 72 hours, collagen fibrils and multiple protuberant structures consisting predominantly of collagen fibrils disappeared, and the trophoblast came into broad contact with endometrial cells through a ruptured zona pellucida, resulting in adhesion and fusion of both cells. The results of these three in vitro studies of rabbit blastocyst implantation demonstrate the intimate mutual relationship and interaction between the blastocyst and endometrial cells during implantation.

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