Abstract
The aim of the present study was to examine the uterine expression pattern of implantation serine proteinase 2 (ISP2) protein during early pregnancy in mice and the effects of anti-ISP2 antibody on embryo implantation. Expression of ISP2 protein was found to be specifically up-regulated in mouse uterine endometrial glands following the initiation of embryo implantation. Similarly, ISP2 protein expression was observed during pseudopregnancy, indicating that its expression is not embryo dependent. In other experiments, rabbit anti-ISP2 IgG was infused into the mouse uterine lumen on Day 3 or 4 of pregnancy to examine its effects on embryo implantation, whereas vehicle (saline) or unspecific rabbit IgG served as controls. The mean number of implanted embryos from anti-ISP2-IgG-treated mice was significantly lower than that from control mice. These results suggest that ISP2 may play an important role during embryo implantation.
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