Prolactin inhibits oestrogen synthesis in the ovary

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Abstract
In 20% of cases of secondary amenorrhea, hyperprolactinemia prevents ovulation by impairing normal follicular development, but little is known of the biochemical basis for this effect. Bromocriptine can restore follicular growth and ovulation by inhibiting the release of prolactin from the pituitary. The suckling stimulus causes an increase in prolactin levels, and ovarian follicles fail to develop fully, thus inducing an anovulatory state throughout lactation in many mammals. Experiments with cultured rat granulosa cells are reported which suggest that this contraceptive action of prolactin is due to its ability to interfere with the action of follicle stimulating hormone on the synthesis of estrogen.