Group IVA phospholipase A 2 optimizes ovulation and fertilization in rodents through induction of and metabolic coupling with prostaglandin endoperoxide synthase 2

Shiro Kurusu, Adam Sapirstein, Joseph V. Bonventre
In: The FASEB Journal · 2012 · vol. 26(9) , pp. 3800–3810 · doi:10.1096/fj.12-203968 · PMID:22673578 · W2096161691
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Group IVA phospholipase A2 amplifies hCG-induced prostaglandin endoperoxide synthase 2, promoting ovulation and fertilization by facilitating prostaglandin production and colocalizing with the enzyme in rodents.

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Abstract

Female mice lacking group IVA phospholipase A(2) (Pla2g4a(-/-)) have a smaller litter size, which is due, in part, to defective implantation. We examined PLA(2)G4A dependence of the processes of ovulation and fertilization. Following induction of ovulation by equine chorionic gonadotropin (eCG)/human CG (hCG) treatment and mating, ovulation and fertilization rates were reduced significantly in Pla2g4a(-/-) mice as compared to wild-type littermates. Human CG triggered robust ovarian prostaglandin (PG) E(2) production in the preovulatory period that was significantly attenuated in Pla2g4a(-/-) mice. Human CG transiently enhanced ovarian expression of PLA(2)G4A and prostaglandin endoperoxide synthase 2 (PTGS2) in wild-type mice. This PTGS2 induction was decreased in Pla2g4a(-/-) mice and also in immature rats treated with the PLA(2)G4A inhibitor, archidonyl trifluoromethyl ketone. A close spatiotemporal association of PLA(2)G4A with PTGS2 was found in mouse and rat preovulatory follicles examined by immunohistochemistry. Less association was observed with 4 other forms of PLA(2). Our data strongly suggest that PLA(2)G4A amplifies hCG induction of PTGS2 and colocalizes with the induced PTGS2, thus contributing to robust PG production required for optimal ovulation and fertilization in rodents.

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