Effects of d-methamphetamine on monkey brain monoamine oxidase, in vivo and in vitro.
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概要
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A and B form MAO activities in mitochondria and synaptosome were measured in the brain of monkeys administered d-methamphetamine (d-MP) 2 mg/kg, i.m., daily for 7 days. When mitochondria were used as an enzyme preparation, the K<SUB>m</SUB> and V<SUB>max</SUB> values decreased with 5-HT (serotonin for A-form MAO substrate) and β-phenylethylamine (β-PEA for B-form MAO substrate), while in the synaptosome, a significant increase of the K<SUB>m</SUB> and V<SUB>max</SUB> values was observed with 5-HT and dopamine as substrates. The mitochondrial MAO treated with d-MP was inhibited strongly by clorgyline and deprenyl with, β-PEA as a substrate, while synaptosomal MAO was highly sensitive to these MAO inhibitors with 5-HT as a substrate. MP and amphetamine (AP) were found in brain mitochondrial and synaptosomal preparations of monkeys administered 2 mg/kg d-MP, i.m. daily for 7 days; MP and AP contents were 5.05±0.22 pg/mg protein and 37.3±3.8 ng/mg protein in mitochondria and 2.35±0.35 pg/mg protein and 46.4±1.5 ng/mg protein in synaptosomes, respectively. MAO was inhibited by MP and its metabolites, AP, p-hydroxymethamphetamine (OH-MP) and p-hydroxyamphetamine (OH-AP), with 5-HT, , β-PEA and dopamine as substrates, in vitro. MP and its metabolites were more potent inhibitors of A-form MAO than B-form MAO.
- 公益社団法人 日本薬理学会の論文
著者
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Egashira Toru
Department Of Cardiology Keio University School Of Medicine
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Yamamoto Toshinori
Department Of Biochemical Toxicology School Of Pharmaceutical Sciences Showa University
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Yamanaka Yasumitsu
Department Of Pharmacology Oita Medical University
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YAMAMOTO Toshinori
Department of Pharmacology, School of Pharmaceutical Science, Showa University
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