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• W2097677193 abstract "Oxytocin (OT) is involved in the stimulation of secretion of anterior pituitary hormones in females during the periovulatory and periparturient periods. In the present study we examined the role of OT in control of ACTH, beta-endorphin, LH and PRL secretion in vitro from dispersed anterior pituitary cells collected from gilts during the luteal (Days 10-12; n=6) and follicular (Days 18-20; n=5) phases of the estrous cycle. Isolated anterior pituitary cells (1 x 10(6)/ml) were transferred into 24-well plates, separately for each animal, and were pre-incubated for three days at 37 degrees C in atmosphere of 5% CO(2) and 95% air. The cells which attached to the dishes were incubated (3.5 h, 37 degrees C) in McCoy's medium in the absence (control) or in the presence of the following factors: CRH alone (10(-10), 10(-9), 10(-8), 10(-7) M), OT alone (10(-8), 10(-7), 10(-6) M), LVP alone (10(-7) M), OT (10(-7) M) plus CRH (10(-9) M) and LVP (10(-7) M) plus CRH (10(-9) M) for studying ACTH and beta-endorphin secretion; OT alone (10(-8), 10(-7), 10(-6) M), GnRH alone (100 ng/ml), CRH alone (10(-9) M), OT (10(-7) M) plus GnRH (100 ng/ml) and OT (10(-7) M) plus CRH (10(-9) M) for studying LH and PRL secretion. Concentrations of the studied hormones in media were analyzed by RIA. Oxytocin alone increased ACTH (at doses 10(-7), 10(-6) M), beta-endorphin (at dose 10(-8) M), LH (at dose 10(-8) M) and PRL (at doses 10(-7), 10(-6) M) secretion by pituitary cells isolated only from luteal-phase gilts. None of the studied hormone concentrations in the medium was increased in response to OT when pituitary cells of follicular-phase gilts were examined. Oxytocin in combination with CRH exerted an additive effect on beta-endorphin secretion during the luteal phase. Summarizing, in the present study the stimulatory effect of oxytocin on ACTH, beta-endorphin, LH and PRL secretion by pituitary cells isolated from gilts during the luteal phase was demonstrated. However, the cells collected from follicular-phase gilts appeared to be unresponsive to OT. Moreover, interaction between OT and CRH in affecting beta-endorphin secretion was shown. These results suggest that OT may be transiently involved in the modulation of anterior pituitary hormone secretion in cyclic pigs." @default.
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• W2097677193 date "2006-07-01" @default.
• W2097677193 modified "2023-09-26" @default.
• W2097677193 title "Effects of oxytocin alone and in combination with selected hypothalamic hormones on ACTH, beta-endorphin, LH and PRL secretion by anterior pituitary cells of cyclic pigs." @default.
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