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- W2036148911 abstract "The repeated administration of morphine (10 mg/kg s.c.) at 3- to 4-day intervals caused sensitization to its ambulation-in-creasing effect. A μ-opioid receptor antagonist naloxone (0.03–1 mg/kg s.c.), and dopamine D1 and D2 receptor antagonists SCH 23390; R-(+)-7-chloro-8-hydroxy-1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine HCI (0.01–0.1 mg/kg s.c.) and YM-09151-2 (nemonapride); cis-N-(1-benzyl-2-methylpyrrolidin-3-yl-5-chloro-2-methoxy-4-methylaminobenzamide (.003–0.1 mg/kg s.c.), respectively, dose dependently reduced the ambulation increase caused by morphine as well as the sensitization to morphine, when one of them was combined with morphine in the repeated administration. Treatment with SCH 23390 or YM-09151-2, but not naloxone, 3 h after each morphine administration tended to enhance the morphine sensitization. Furthermore, when YM-09151-2 (0.1 mg/kg) was repeatedly administered to the morphine-naive mice 5 times at 3- to 4-day intervals, these mice showed a significant increase in morphine sensitivity. Although the morphine sensitization was partially reversible, repeated (5 times) treatment of the morphine-sensitized mice with SCH 23390 (0.1 mg/kg) resulted in a further enhancement in morphine sensitivity. The same treatment with YM-09151-2 (0.03 and 0.1 mg/kg) tended to increase the sensitivity. These results suggest that, in terms of ambulation in mice, an enhancement of dopaminergic neurotransmission through the agonistic action on μ-opioid receptors is responsible for induction of morphine sensitization. It is also considered that certain changes in the systems mediated by dopamine D1 and D2 receptors are involved in the enhancement of the morphine sensitization and for the overall increase in the morphine sensitivity, respectively." @default.
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- W2036148911 title "Modification of morphine sensitization by opioid and dopamine receptor antagonists: evaluation by studying ambulation in mice" @default.
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- W2036148911 doi "https://doi.org/10.1016/0014-2999(94)00787-8" @default.
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