Abstract
A protein fraction (GF 2) was purified from sheep ovarian follicular fluid. Its action on 3 β-HSD activity in the mouse granulosa cells was measured in an in vitro system. The fraction (GF 2) caused dose-dependent cep emotion of the 3 β-HSD activity in granulosa cells and progesterone in the spent medium. A maximum inhibition of the activity was achieved after 30 min incubation of the granulosa cells with the GF 2 fraction. Further purified HPLC fraction (Fr 1) also inhibited 3 β-HSD activity. In vivo administration of the GF 2 fraction in normal cycling female mice also decreased the 3 β-HSD activity in the granulosa cells of the ovarian follicles and plasma progesterone levels indicating the GF 2 fraction to be a 3 β-HSD inhibitor.
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