[Effect of estrone on rat uterine contraction induced by prostaglandin (author's transl)]

Influence of estrone on uterine contraction and increase of internal pressure of uterus induced by PG were studied in the rat. The sensitivity of the uterus to PG was increased after estrone injection, the maximum effect being observed 72 hours after the administration. Regarding uterine contraction and increase of internal pressure induced by PGE2 or PGF2alpha, the amplitude was enlarged but the frequency was decreased with estrone injection. Contraction and increase of internal pressure induced by PG were well correlated in the rat uterus treated with estrone. Progesterone inhibited the stimulatory action of estrone on uterine contraction induced by PG. These results suggest that estrone may play an important role in action of PG in rat uterus.