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- W2014190648 abstract "The relationships between the release of LHRH, β-endorphin (β-END) and noradrenaline (NA) from the hypothalamic infundibular nuclei/median eminence (NI/ME) during the periovulatory period in the ewe was studied. Neurohormone release was assayed in perfusates collected from the NI/ME via push-pull cannulae. LHRH concentrations in perfusates ranged from below detectable values (5 pg) to 50 pg and from 15 to 240 pg/20 min perfusate on the days of proestrus and estrus, respectively. β-END concentrations in perfusates ranged from 320 to 6,000 pg on the day of proestrus and fell to a range between 100 and 380 pg/20 min perfusate on the day of estrus. The NA content of perfusates ranged from an undetectable level to 0.9 × 104 pg/perfusate during proestrus, and rose from 1.0 × 104 to 6.6 × 104 pg/perfusate shortly before the preovulatory release of LHRH and LH. On the basis of the present observations, the following sequence of events leading to the massive LH ovulatory surge in the sheep is suggested: (1) increased secretion of β-END in the NI/ME on the day of proestrus generates an increase in the releasable pool of LHRH through inhibition of LHRH release; (2) on the day of estrus a decreased release of β-END allows the expression of NA activity in the NI/ME and the augmentation of NA tone facilitates the release of newly accumulated LHRH; (3) the resultant intensified LHRH output with its significantly changing pattern of release triggers the preovulatory surge of LH." @default.
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- W2014190648 date "1991-01-01" @default.
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- W2014190648 title "Release of Luteinizing Hormone-Releasing Hormone, β-Endorphin and Noradrenaline by the Nucleus Infundibularis/Median Eminence during Periovulatory Period in the Sheep" @default.
- W2014190648 doi "https://doi.org/10.1159/000125863" @default.
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