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Cycloheximide inhibition of ovulation, prostaglandin biosynthesis and steroidogenesis in rabbit ovarian follicles

Summary. Cycloheximide (5 mg/kg, i.v.) significantly inhibited ovulation in the rabbit when it was administered as early as 20 h before the ovulation process was initiated by hCG, and as late as 1 h after hCG. The ovulation rate was significantly reduced, but follicular biosynthesis of prostaglandins E and F was only partly inhibited. The biosynthesis of progesterone and oestradiol in follicles during the early stages of the ovulation process was also inhibited. Cycloheximide may therefore inhibit ovulation by a mechanism which is different from the action of indomethacin, and this mechanism may involve the suppression of ovarian steroidogenesis.