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Effect of Pregnancy-Specific β1-Glycoprotein on the Development of Preimplantation Embryo

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The objective of this study is to test the hypothesis that members of the pregnancy-specific β1-glycoprotein (PSG) family enhance the growth and maturation of embryos. cDNA encoding two members of the PSG family, namely PSG1 and PSG3, were expressed in Chinese Hamster Ovary (CHO) cells with the expression vector pHβAPr-1-neo. Two-cell stage mouse embryos were co-cultured in a two-chamber system with CHO cells expressing either recombinant PSG1 (rPSG1) or PSG3 (rPSG3) in the presence and absence of neutralizing PSG antibodies. The cleavage and maturation stage of the embryos was assessed at 12-hr intervals. Mouse embryos co-cultured with transfectants expressing rPSG1 showed a significant enhancement of cleavage and maturation rate compared to controls with P < 0.005–0.004. In co-cultures with CHO cells expressing rPSG3, no significant difference from the controls was observed in the early stage of development until late blastocyst formation. At that stage, there was a statistically significant enhancement of development by rPSG3 when compared to controls with P < 0.001. These results suggest that PSG1 and PSG3 exhibit embryotropic activity at different stages of development in the mouse model.

Document Type: Research Article

Affiliations: 1: Department of Pediatrics, Georgetown University Medical Center, Washington, DC 20007 2: Department of Obstetrics and Gynecology, Georgetown University Medical Center, Washington, DC 20007 3: Department of Cell Biology and Biochemistry & Molecular Biology, Georgetown University Medical Center, Washington, DC 20007

Publication date: 1999-03-01

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