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Immature rats were injected with PMSG (Day 0) and hCG (Day 3). PMSG caused an increase in cholesterol side-chain cleavage activity and the concentration of its terminal oxidase, cytochrome P-450, and an increase in cholesterol ester hydrolase activity in ovarian homogenates; the activity of both enzymes was further increased after hCG injection. Cholesterol ester hydrolase activity/mg ovarian wet weight was unchanged between Days 0 and 13, but the concentration of cytochrome P-450/mg wet weight increased 3-fold between Days 5 and 6. Cholesterol side-chain cleavage activity, measured in terms of pregnenolone production/mg wet weight, showed its largest increase (10-fold) between Days 6 and 7. Addition of exogenous cholesterol maintained the rate of pregnenolone production in incubated ovarian homogenates on Days 7--9.

Action of gonadotrophic hormones on cholesterol side-chain cleavage and cholesterol ester hydrolase in the ovary of the immature rat