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• W2113268577 abstract "H(2)N-Tyr-D-Thr-Gly-Phe-Leu-Ser-(O-beta-D-lactose)-CONH(2) (MMP2200) is a novel glycopeptide opioid agonist with similar affinities for mu and delta receptors. Glycosylation promoted brain penetration and production of centrally mediated behavioral effects in mice; however, it is unknown whether the magnitude of enhanced brain penetration is sufficient to permit central mediation of drug effects and production of synergistic mu/delta antinociceptive interactions after systemic administration in primates. To address this issue, the present study compared the effects of MMP2200 and the mu-agonist morphine in four behavioral procedures in rhesus monkeys. In an assay of thermal nociception, morphine (1.0-5.6 mg/kg) produced dose-dependent antinociception, whereas MMP2200 (10-56 mg/kg) was ineffective. In an assay of capsaicin-induced thermal allodynia, both morphine (0.01-1.0 mg/kg) and MMP2200 (0.032-3.2 mg/kg) produced dose-dependent antiallodynic effects. MMP2200-induced antiallodynia was blocked by the moderately mu-selective antagonist naltrexone (0.01 mg/kg), the delta-selective antagonist naltrindole (1.0 mg/kg), and the peripherally selective opioid antagonist quaternary naltrexone (0.32 mg/kg). In an assay of schedule-controlled behavior, both morphine (0.01-1.0 mg/kg) and MMP2200 (10-56 mg/kg) decreased response rates. Morphine effects were antagonized by naltrexone (0.001-0.01 mg/kg); however, the effects of MMP2200 were not antagonized by either naltrexone (0.01 mg/kg) or naltrindole (1.0 mg/kg). In an assay of drug self-administration, morphine (0.0032-0.32 mg/kg/injection) produced reinforcing effects, whereas MMP2200 (0.032-0.32 mg/kg/injection) did not. These results suggest that systemically administered MMP2200 acted as a peripheral, mu/delta-opioid agonist with limited distribution to the central nervous system in rhesus monkeys. These results also suggest the existence of species differences in the pharmacokinetics and brain penetration of glycopeptides." @default.
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• W2113268577 date "2008-05-29" @default.
• W2113268577 modified "2023-09-27" @default.
• W2113268577 title "Behavioral Pharmacology of the μ/δ Opioid Glycopeptide MMP2200 in Rhesus Monkeys" @default.
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• W2113268577 doi "https://doi.org/10.1124/jpet.108.138180" @default.
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