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• W1987183208 abstract "Oxytocin (OT) is involved in the regulation of luteolysis in pigs. However, it is still not clear if OT is responsible for initiation of luteal regression in this species. The objectives of the study were: (1) to compare OT receptors (OTr) concentrations in endometrium and myometrium of cyclic and early pregnant pigs, (2) to examine the effect of OT on plasma PGF(2)alpha secretion during the progressive luteal regression, (3) to ascertain the effect of OT on inositol phosphates (IPs) accumulation in endometrial and myometrial cells of cyclic and early pregnant pigs. Concentrations of OTr on the endometrium and myometrium of cyclic (n = 33) (days 2-4; 11-13; 14-16; 18-20; day 21) and early pregnant (n = 4) (days 14-16) gilts were determined and they ranged from 7 +/- 3 (days 11-13) to 377 +/- 113 fmol/mg protein (day 21) in the endometrium and from 33 +/- 11 (days 2-4) to 167 +/- 28 fmol/mg protein (days 18-20) in the myometrium. In both tissues, concentrations of OTr were low during the luteal phase and increased (P < 0.01) during the follicular phase. In contrast to myometrial OTr, endometrial OTr during pregnancy were undetectable. In next experiment, mature gilts (n = 12) were injected with OT (20IU; i.v.) for three consecutive days starting on days 14 and 15 of the oestrous cycle and plasma PGF(2)alpha metabolite-13,14-dihydro-16-keto PGF(2)alpha (PGFM) concentration was determined. On days 15-16 and 16-17, OT increased plasma PGFM level. This effect was not observed on days 14-15 of the estrous cycle. A negative correlation was noticed between plasma concentrations of PGFM and progesterone (r = -0.3; P < 0.05). In last experiment, OT (100 nM) augmented (P < 0.01) an accumulation of inositol phosphates (IPs) in isolated myometrial cells on days 14-16 (n = 4) and 18-20 (n = 3) of the estrous cycle and on days 14-16 (n = 4) of pregnancy. Oxytocin-stimulated accumulation of IPs was not observed in endometrial cells. In summary: (1) concentrations of OTr on both the endometrium and myometrium were the highest during perioestrus-period in pigs, (2) myometrium of early pregnant sows possessed functional OTr, (3) oxytocin increased plasma PGFM concentration after initiation of luteolysis; and (4) OT-stimulated accumulation of IPs in myometrial, but not in endometrial cells. In conclusion, OT appears to not be involved in the initiation of luteal regression in sows and functional OTr are still present in the myometrium during early pregnancy (days 14-16)." @default.
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• W1987183208 date "2005-09-01" @default.
• W1987183208 modified "2023-10-14" @default.
• W1987183208 title "Oxytocin (OT) action in uterine tissues of cyclic and early pregnant gilts: OT receptors concentration, prostaglandin F2α secretion, and phosphoinositide hydrolysis" @default.
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• W1987183208 doi "https://doi.org/10.1016/j.anireprosci.2004.12.011" @default.
• W1987183208 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16143221" @default.
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