RS-2232, a compound with a reversible and specific type-A monoamine oxidase inhibiting property in mouse brain.

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概要

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• Effects of RS-2232 on monoamine oxidase (MAO) activities in mouse brain and liver were investigated with 5-hydroxytryptamine (5-HT), β-phenyl-ethylamine (PEA), and in some cases, kynuramine as substrate. IC50s of RS-2232 for 5-HT (100 μM) and PEA (20 μM) deaminations in brain mitochondrial preparations were 0.14 μM and 52 μM, respectively. RS-2232 was found to be a competitive inhibitor of 5-HT deamination in the preparation, and its K<SUB>i</SUB> was 0.054 μM. The inhibitions of MAO in both brain and liver homogenate by RS-2232 in vitro measured with kynuramine (100 μM) were independent of the prolonged preincubation. 5-HT deaminations in the brain homogenates of mice treated with RS-2232 were decreased significantly by 15% and 59% at 10 and 30 mg/kg (p.o.) of the compound, respectively. On the other hand, PEA deaminations were not changed at the same doses. Pressor responses induced by intravenous tyramine (0.1-1.0 mg/kg) in anesthetized rats was little affected by oral administration of RS-2232 (3-30 mg/kg) once daily for two weeks. These results reveal that RS-2232 has a reversible and specific type-A MAO inhibiting property in mouse brain, and they suggest that RS-2232 is relatively safe in tyramine-potentiation.

• 公益社団法人 日本薬理学会の論文

著者

• IWATA NOBUYOSHI

  Biological Research Laboratories, Sankyo Co.

• Yokoyama Tomihisa

  Biological Research Laboratories Sankyo Co.

• KOBAYASHI Takashi

  Pharmaceutical Research Department, Ube Laboratory, Ube Industries, Ltd.

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