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- W2034177794 abstract "Intact cyclic ewes have been used in experiments designed to examine the mechanism by which uterine oxytocin receptor synthesis is controlled during the oestrous cyclic. Previous experiments have shown that the prostaglandin F2 alpha analogue cloprostenol is luteolytic in ewes receiving oxytocin by continuous intra-venous infusion. When ewes receiving oxytocin are given cloprostenol uterine oxytocin receptor concentrations are raised, whereas in animals receiving oxytocin alone, they remain low. To investigate whether inhibition of oxytocin receptor binding activity by oxytocin is either dependent on elevated plasma progesterone concentrations or over-ridden by oestrogens secreted by ovarian follicles maturing as a result of cloprostenol treatment, ewes were given oxytocin by continuous intravenous infusion (3 nmol h-1) between Days 12 and 17 after oestrus and one of the following: no further treatment; cloprostenol [125 micrograms intramuscularly (i.m.)] on Day 15; progesterone, by subcutaneous implant, from Day 14 with cloprostenol on Day 15; medroxyprogesterone acetate (MPA; 6 mg depot i.m.) on Day 14 followed by cloprostenol on Day 15; or oestradiol-17 beta (2.75 mumol i.m.) on Days 14 and 15. Concentrations of oxytocin receptor were measured at autopsy on Day 17 in caruncular endometrium, intercaruncular endometrium and myometrium. Ovarian follicles and corpora lutea were examined to determine the effect of treatment on these tissues. Treatment with oxytocin alone resulted in the maintenance of corpora lutea, reduced follicular development and a low concentration of uterine oxytocin receptor. Cloprostenol initiated luteolysis in oxytocin-treated ewes. This was associated with a high level of oxytocin receptor binding activity in all ewes except those receiving exogenous progesterone.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2034177794 date "1992-01-01" @default.
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- W2034177794 title "Effect of continuous infusion of oxytocin on ovarian function and uterine oxytocin receptor concentration in the cyclic ewe" @default.
- W2034177794 doi "https://doi.org/10.1071/rd9920505" @default.
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