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Pregnancy suppression by a platelet activating factor antagonist, ONO-6240, in mice
M Ando1, H Suginami, S Matsuura
1Department of Obstetrics and Gynecology, Ehime University School of Medicine, Japan.
Abstract:
Mouse embryos produce an embryo-derived platelet activating factor (EDPAF) during their early developmental stages. The present study was aimed at investigating the physiological significance of EDPAF by using a specific PAF antagonist, ONO-6240. EDPAF-induced platelet decrease was antagonized by ONO-6240 in a dose-dependent manner, although this alone did not affect circulating platelet concentrations. ONO-6240, when administered to maternal mice, increased the proportion of mice conceiving small litter sizes, whereas it did not affect in vivo or in vitro development of embryos. EDPAF was suggested to play an important role in establishing pregnancy in mice by promoting implantation.
Insights
Embryo-derived platelet activating factor (EDPAF) is crucial for mouse pregnancy. Blocking EDPAF with ONO-6240 impaired implantation and reduced litter size, highlighting its role in establishing pregnancy.
Area of Science:
- Reproductive biology
- Developmental biology
- Pharmacology
Background:
- Mouse embryos secrete embryo-derived platelet activating factor (EDPAF) during early development.
- The precise physiological role of EDPAF in pregnancy establishment remains unclear.
Purpose of the Study:
- To investigate the physiological significance of EDPAF in mouse pregnancy.
- To determine the role of EDPAF in embryo implantation and development.
Main Methods:
- Utilized ONO-6240, a specific platelet activating factor (PAF) antagonist.
- Administered ONO-6240 to maternal mice and assessed effects on litter size and embryo development.
- Investigated EDPAF's effect on circulating platelet concentrations in vivo.
Main Results:
- ONO-6240 dose-dependently antagonized EDPAF-induced platelet reduction.
- Maternal administration of ONO-6240 led to smaller litter sizes.
- ONO-6240 did not adversely affect in vivo or in vitro embryo development.
Conclusions:
- EDPAF plays a significant role in establishing pregnancy in mice.
- EDPAF appears to promote successful embryo implantation, contributing to normal litter size.