Arachidonyl ethanolamide, anandamide (ANA) was administered to male rats via a single i.p. injection at a dose of 0.02 mg/kg. In an parallel experiment ANA injection was preceded by the injection of SR 141716 (1.0 mg/kg), a selective and potent cannabinoid receptor antagonist. We observed using FOS protein immunocytochemistry that the parvocellular part of… (More)
Immature female rats were induced to ovulate by an injection of pregnant mare serum: melatonin, intraperitonealy injected, induce an increase of LH-RH immunoreactive neurons in the hypothalamus. These neurons are localized in septo preoptic, infundibular and premammillary areas.