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Effect of prolactin on the production of progesterone by mouse ovaries in vitro.

Prolactin constitutes part of the luteotrophic complex necessary for the maintenance and secretory activity of the CL in the rat (Evans, 1941; 1941), mouse rabbit Hilliard hamster Rothchild, ferret pig Mesnil and sheep There is also evidence from in-vitro studies that low concentrations of prolactin are essential for the production of progesterone by preovulatory human granulosa cells Sawers & McNatty, Bennie, Hunter McNeilly, 1976) while high concentrations are inhibitory (McNatty et al., 1976). In the present study the effect of various concentrations of prolactin on the production of progesterone by mouse ovaries in organ culture with or without luteal tissue was investigated, and the effects of rat, sheep or human prolactin preparations on ovarian steroidogenesis were compared. Linear regression analysis established the following significant correlations between prolactin concentration and progesterone production : 25-day-old ovaries: with CL; rat prolactin, r = 0-45, P<0-01; ovine prolactin,