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- W2030202457 abstract "The present study examines the effect of naloxone on GnRH release in vitro under different steroid milieus. Naloxone (6.1 mumol/kg) administered 30 min before decapitation was highly effective in evoking GnRH release from superfused hypothalamic tissues derived from ovariectomized, estradiol- and progesterone-treated immature rats, while ineffective in altering GnRH release from intact, ovariectomized and vehicle- or estradiol-treated rats. To further explore the possible involvement of catecholamines in the naloxone-stimulated GnRH release, diethyldithiocarbamic acid (2.9 mmol/kg), an inhibitor of noradrenalin synthesis, was administered ip 30 min before naloxone injection into ovariectomized, estradiol- and progesterone-treated rats. Diethyldithiocarbamic acid markedly reduced the naloxone-evoked GnRH release, although it was ineffective in modifying the spontaneous release of GnRH. A blockade of alpha-adrenergic receptor with phenoxybenzamine significantly suppressed the naloxone-stimulated GnRH release, whereas treatment with propranolol, a beta-adrenergic receptor blocker, failed to alter GnRH release. The present data suggest that the endogenous opioid peptide may participate in the regulation of GnRH release under a particular steroid milieu, and the inhibitory action of endogenous opioid peptide seems to require the mediation of adrenergic neurotransmission, presumably through alpha-adrenergic receptor." @default.
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- W2030202457 date "1991-12-01" @default.
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- W2030202457 title "Adrenergic mediation of the naloxone-induced GnRH release from hypothalami of ovariectomized, steroid-treated immature rats" @default.
- W2030202457 doi "https://doi.org/10.1530/acta.0.1250680" @default.
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