Prostaglandin E2 and F2 alpha in mid-pregnant rat uterus and at parturition

Prostaglandin E2 (PGE2) and F2 alpha (PGF2 alpha) produced by 15 days pregnant rat myometrium, by parturient rat myometrium and myometrium plus endometrium were measured in vitro. The results showed that the PGs produced by parturient myometrium were higher than these obtained during mid-pregnancy. Myometrium with endometrium released more PGs than myometrium alone, and the addition of arachidonic acid (AA) at 10 DM did not show any significant effect. Exogenous progesterone or estradiol-17b at a concentration of 1 Dmol had no effect on parturient uterine PG secretions.