RELEASE OF GONADOTROPHIN-RELEASING HORMONE (Gn-RH) FROM ISOLATED, PERIFUSED MEDIAL-BASAL HYPOTHALAMUS BY MELATONIN1

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Abstract
Basal release of Gn-RH from perifused medial-basal hypothalami of rats was at or below levels detectable by radioimmunoassay. Infusion of norepinephrine, dopamine, acetylcholine or serotonin (0.1-10 mM) as 10-20 min pulses was not associated with a detectable increase of Gn-RH in the effluent. However, 10-20 min pulses of melatonin (0.1-1.0 mM) consistently caused release of Gn-RH.

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