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- W2024143454 abstract "This paper further substantiates the physiological role of β-endorphin (β-END) in the control of the cyclic LH secretion and provides new data on the interactions between 17β-estradiol (17β-E2) and β-END at both the hypothalmic and pituitary levels. At the hypothalamic level, during the estrous cycle in rats, β-END concentrations were highest on diestrus I in the arcuate nucleus, median preoptic area and median eminence and lowest at the time of the preovulatory 17β-E2 surge on proestrus, before the subsequent preovulatory hypothalamic GnRH and plasma LH surges. Data obtained in ovariectomized 17β-E2-treated ewes support the direct involvement of 17β-E2 in changes in β-END and GnRH concentrations in these hypothalamic areas. At the anterior pituitary level, in vitro results obtained using anterior pituitaries from the proestrus morning cycling female rat have shown that 17β-E2 strongly suppresses β-END secretion and that GnRH stimulates the release of β-END. Furthermore, marked fluctuations were observed for plasma β-END throughout the menstrual cycle in the woman. Low β-END concentrations were observed in the period preceding the LH preovulatory surge. Taken together, these results show that: (1) decreases in hypothalamic β-END concentrations, which are controlled at least by circulating levels of 17β-E2, modulate GnRH synthesis and/or release and contribute to the mechanisms which initiate the LH surge; (2) anterior pituitary β-END might be involved in the mechanisms which terminate the LH surge." @default.
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- W2024143454 date "1988-01-01" @default.
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- W2024143454 title "Interactions between 17β-estradiol and the hypothalamo-pituitary β-endorphin system in the regulation of the cyclic LH secretion" @default.
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- W2024143454 doi "https://doi.org/10.1016/0022-4731(88)90089-1" @default.
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