Abstract

Physiological evidence is presented for the possible existence of anhydrolevuglandin E 2-like activity in extracts of uteri from diestrous rats and after treatment of adult rats with estradiol and progesterone. The extracts were able to inhibit contractions in rat uterine preparations stimulated by PGE 2. Uteri of vaginal Stage 3 (metestrus) were quiescent and showed decreased responsiveness to PGE 2 and PGF 2α. These uteri showed some contractility when incubation medium from diestrous uteri (Stage 5) were transferred to them and incubation medium from them inhibited the contractility of Stage 5 uteri. When incubation media were exchanged between contractile uteri from of stages other than Stage 3, there was no change in the contraction patterns. Taken together, we believe these data indicate that AnLGE 2 may be a normal constituent of the rat uterus and is physiologically increased during Stage 3 (metestrus) of the estrous cycle.

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