Do prostaglandins lead to ovulation in the rabbit by stimulating proteolytic enzyme activity?

Toyohiko Miyazaki, Arun Dharmarajan, Susan J. Atlas, Eugène Katz, Edward E. Wallach
In: Fertility and Sterility · 1991 · vol. 55(6) , pp. 1183–1188 · doi:10.1016/s0015-0282(16)54372-6 · PMID:2037112 · W2400402242
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Abstract

ObjectiveTo determine if prostaglandins (PGs) have a direct effect on the ovarian proteolytic enzyme system by examining ultrastructure of the follicle wall and the microvasculature in the presence and absence of indomethacin and by using the isolated perfused rabbit ovary.DesignNine hours after administration of human chorionic gonadotropin (hCG) or hCG plus indomethacin, follicles were removed and processed for scanning and transmission electron microscopy. Isolated perfused rabbit ovaries were induced to ovulate with PGF2 alpha (100 ng/mL) in the presence and absence of tranexamic acid (0.1, 1.0, or 10 mM), a plasminogen activator inhibitor.ResultsThe addition of indomethacin to hCG inhibited ovulation and production of PGs without affecting the follicular microvasculature. However, the changes in follicle wall architecture were less pronounced after treatment with indomethacin. Ovulatory efficiency in response to PGF2 alpha (the percent of follicles greater than 1.5 mm that ovulate) was significantly reduced (P less than 0.01) by 10 mM tranexamic acid.ConclusionsThese results suggest that PGs induce follicular rupture by activation of proteolytic enzymes located in the follicle wall.

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