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- W2024961491 abstract "3-Acetoxy-6β-acetylthio-10-oxo-N-cyclopropylmethyl-dihydronormorphine (KT-95) is a synthesized compound that binds to μ-, δ- and κ-opioid receptors in vitro. KT-95 induces analgesia and this effect is antagonized by nor-BNI, a selective κ-opioid receptor antagonist. We have reported that κ-opioid receptor agonists improve impairment of learning and memory in mice and/or rats. In this study, the effects of KT-95 were investigated in an acetic acid-induced writhing test and scopolamine-induced memory impairment test using spontaneous alternation performance in a Y-maze and a step-down type passive avoidance test. Male ddY mice were treated with KT-95 (0.24–2.35 μmol/kg, s.c.) 30 min before the behavioral test. In the writhing test, the antinociceptive effect of KT-95 (2.35 μmol/kg) was completely antagonized by nor-BNI (4.9 nmol/mouse, i.c.v.), but not by naloxone (3.05 μmol/kg, s.c.). KT-95 significantly improved the impairment of spontaneous alternation induced by scopolamine (1.65 μmol/kg, s.c.). The ameliorating effect of KT-95 was not antagonized by nor-BNI, but was almost completely antagonized by a selective σ-receptor antagonist, N,N-dipropyl-2-[4-methoxy-3-(2-phenylenoxy)-phenyl]-ethylamine monohydrochloride (NE-100, 2.6 μmol/kg, i.p.). KT-95 also significantly improved scopolamine-induced learning and memory impairment in the passive avoidance test, although the effect was partial. Administration of KT-95 itself induced impairment of learning and memory. KT-95-induced impairment was not antagonized by naloxone, naltrindole, nor-BNI or NE-100 indicating that this impairment was not because of opioid receptor stimulation. These results suggested that although the KT-95-induced antinociceptive effect was mediated by κ-opioid receptors, the KT-95-induced improvement in scopolamine-induced impairment of memory was mediated mainly via σ-receptors and partially by κ-opioid receptors." @default.
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- W2024961491 date "2006-02-01" @default.
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- W2024961491 title "Pharmacological characterization of the ameliorating effect on learning and memory impairment and antinociceptive effect of KT-95 in mice" @default.
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- W2024961491 doi "https://doi.org/10.1016/j.bbr.2005.09.009" @default.
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