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- W4239342014 abstract "(-)-3-Acetyl-6beta-acetylthio-N-cyclopropylmethyl-normorphine (KT-90) is a synthesized compound that binds to mu-, delta- and kappa-opioid receptors in vitro. KT-90 induces analgesia in the tail-flick test and this effect is antagonized by nor-BNI, a selective kappa-opioid receptor antagonist. However, lower doses of KT-90 antagonize morphine-induced analgesia. We reported that kappa-opioid receptor agonists such as U-50,488H and dynorphin A (1-13), improved scopolamine-induced impairment of learning and memory in mice and/or rats. In this study, the effects of KT-90 were investigated in an acetic acid-induced writhing test and scopolamine-induced memory impairment test using spontaneous alternation performance in a Y-maze. Male ddY mice were treated with scopolamine (1.65 micromol/kg, s.c.) 30 min before the behavioral test. KT-90 (0.07-2.35 micromol/kg, s.c.) was injected 30 min before testing. In the writhing test, the antinociceptive effect of KT-90 (0.71 micromol/kg) was completely antagonized by a selective mu-opioid receptor antagonist, beta-funaltrexamine (10.2 nmol/mouse, i.c.v.) and partially antagonized by nor-BNI (4.9 nmol/mouse, i.c.v.), but it was not antagonized by a selective delta-opioid receptor antagonist, naltrindole (9.1 pmol/mouse, i.c.v.). KT-90 significantly improved the impairment of spontaneous alternation induced by scopolamine. The ameliorating effect of KT-90 was not antagonized by nor-BNI, but was almost completely antagonized by a selective sigma receptor antagonist, NE-100 (2.6 micromol/kg, i.p.). These results suggested that the KT-90-induced antinociceptive effect was mediated by mu- and partially by kappa-opioid receptors, and the KT-90-induced improvement in scopolamine-induced impairment of spontaneous alternation was mediated mainly via sigma receptors." @default.
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- W4239342014 date "2005-05-01" @default.
- W4239342014 modified "2023-10-16" @default.
- W4239342014 title "Pharmacological characterization of the ameliorating effect on short-term memory impairment and antinociceptive effect of KT-90 in mice" @default.
- W4239342014 doi "https://doi.org/10.1016/j.bbr.2005.01.003" @default.
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