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- W4313199662 abstract "In this study, we examined the selectivity, electrophysiological properties and analgesic activity of KTtp38, a novel inhibitor of T-type Ca2+ (Cav3) channels, developed by structural modification of pimozide, a typical antipsychotic agent. The IC50 value (μM) of KTtp38 was 0.0934 and 1.109 for inhibiting Cav3.2-dependent currents in response to a test pulse of -20 mV from holding potentials (HPs) of -80 and -110 mV, respectively, indicating a state dependency. The IC50 of KTtp38 for inhibiting Cav3.1-depedent currents caused by the test pulse from HP of -80 mV was 0.217 μM. Pimozide, but not KTtp38, at 1 μM completely inhibited the specific bindings of [3H]-spiperone to D2 and D3 receptors in rat striatal membrane fractions. In isolated rat jugular vein rings, the 5-HT2 receptor-mediated contraction was inhibited by pimozide, but not KTtp38, at 10 μM. In mice, i.p. administration of pimozide, but not KTtp38, caused catalepsy. KTtp38 abolished somatic and visceral pain caused by an H2S donor, known to enhance Cav3.2 activity, in mice. KTtp-38 also reversed oxaliplatin-induced peripheral neuropathy in wild-type, but not Cav3.2-null, mice. The T1/2 (h) of KTtp38 and pimozide in the blood was 2.42 and 2.47, respectively. Collectively, KTtp-38 is considered a state-dependent, selective Cav3 inhibitor and useful as an analgesic." @default.
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- W4313199662 date "2022-01-01" @default.
- W4313199662 modified "2023-10-16" @default.
- W4313199662 title "A novel T-type Ca<sup>2+ </sup>channel inhibitor, KTtp38, developed by structural modifications of pimozide, a typical antipsychotic agent: Evaluation of the channel selectivity, electrophysiological characteristics and analgesic activity" @default.
- W4313199662 doi "https://doi.org/10.1254/jpssuppl.96.0_1-b-ss06-6" @default.
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