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The effects of melatonin (Mel) on the development of tolerance to antinociceptive actions induced by mu- and delta-opioid receptor agonists were determined in male Kunming mice. In the mouse tail-flick tests, selective mu and delta receptor agonists were repeatedly administered to mice supraspinally (intracerebroventricularly, i.c.v.) in the absence or presence of melatonin. Administration of endomorphin-1...
This present study examines the effect of melatonin on antinociceptive action induced by opioid agonists in mice using the tail-flick test. When injected either by intraperitoneal (i.p.) (1, 5, 25 mg/kg) or by intracerebroventricular (i.c.v.) (0.25, 0.5, 1 mg/kg) routes, melatonin significantly enhanced the δ-opioid agonist deltorphin I induced antinociception, but not μ-opioid agonist endomorphin-1...
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