Stimulation of ovine myometrial activity by 6-keto prostaglandin E1 |
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Authors: | SJ Lye P Carnevale DM Olson JRG Challis |
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Institution: | MRC Group Reproductive Biology Depts. Ob/Gyn and Physiology The University of Western Ontario London, Canada |
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Abstract: | 6-keto prostaglandin E1 (6KE) is a metabolite of PGI2, which we have shown previously inhibits spontaneous myometrial activity. In the present study we examined the effects of 6KE on uterine electrical and mechanical activity in non-pregnant ovariectomized sheep. 6KE stimulated uterine activity in a dose-dependent fashion. The effect was enhanced by pre-treatment with estradiol (E2). It was not influenced by pre-treatment with meclofenamic acid and was not associated with significant changes in the concentrations of 13,14 dihydro 15-keto PGF2α in vena cava plasma. After E2 treatment, 6KE had 0.2–0.3 of the stimulatory activity of PGF2α. In the absence of E2, the uterine response to both 6KE and PGF2α was decreased. In animals in which spontaneous myometrial activity was inhibited by PGI2, the uterus remained responsive to 6KE. We conclude that in the ovariectomized non-pregnant sheep 6KE stimulates uterine activity, and that the effect is independent of endogenous PG production. |
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