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- W2020850711 abstract "The effects of the kappa-opioid receptor agonist, TRK-820, (-)-17-(cyclopropylmethyl)-3, 14beta-dihydroxy-4, 5alpha-epoxy-6beta-[N-methyl-trans-3-(3-furyl) acrylamido] morphinan hydrochloride, on the itch sensation were compared with those of histamine H1 receptor antagonists, using the mouse pruritogen-induced scratching model. Peroral administration of TRK-820 reduced the numbers of substance P- or histamine-induced scratches dose dependently. No obvious suppression of the spontaneous locomotor activity was observed at the doses used for the experiments, indicating that the inhibition of scratches was not due to the effect on general behavior. Furthermore, the scratching inhibitory activity of TRK-820 was dose dependently antagonized by the specific kappa-opioid receptor antagonist, nor-binaltorphimine, suggesting that the inhibitory activity was mediated via kappa-opioid receptors. Histamine H1 receptor antagonists, chlorpheniramine and ketotifen, did not inhibit substance P-induced scratches, or did so only partially. Both antihistamines inhibited the histamine-induced scratches completely. These results suggest that TRK-820 has antipruritic activity which is mediated by kappa-opioid receptors, and is effective in both antihistamine-sensitive and -resistant pruritus." @default.
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- W2020850711 date "2002-01-01" @default.
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- W2020850711 title "Antipruritic activity of the κ-opioid receptor agonist, TRK-820" @default.
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- W2020850711 doi "https://doi.org/10.1016/s0014-2999(01)01588-6" @default.
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