In Vitro Screening of Psychoactive Drugs by [^<35>S]GTPγS Binding in Rat Brain Membranes(Pharmacology)

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We constructed a reproducible, simple, and small-scale determination method of the psychoactive drugs that acted directly on the monoamine receptor by measuring the activation of [^<35>S]guanosine-5'-O-(3-thio)-triphosphate binding to guanine nucleotide-binding proteins (G proteins). This method can simultaneously measure the effects of three monoamines, namely dopamine (DA), serotonin (5-HT), and norepinephrine (NE), in rat brain membranes using a 96-well microplate. Activation of D_1 and D_2 receptors in striatal membranes by DA as well as 5-HT and NEα_2 receptors in cortical membranes could be measured. Of 12 tested phenethylamines, 2, 5-dimethoxy-4-chlorophenethylamine (2C-C), 2, 5-dimethoxy-4-ethylphenethylamine (2C-E), and 2, 5-dimethoxy-4-iodophenethylamine (2C-I) stimulated G protein binding. The other phenethylamines did not affect G protein binding. All 7 tryptamines tested stimulated G protein binding with the following rank order of potency; 5-methoxy-N, N-dimethyltryptamine (5-MeO-DMT)>5-methoxy-N, N-diallyltryptamine (5-MeO-DALT)>5-methoxy-α-methyltryptamine (5-MeO-AMT)≥5-methoxy-N, N-methylisopropyltryptamine (5-MeO-MIPT)>5-methoxy-N, N-diisopropyltryptamine (5-MeO-DIPT)>N, N-dipropyltryptamine (DPT)≥ α-methyltryptamine (AMT). This assay system was able to designate psychoactive drugs as prohibited substances in accordance with criteria set forth by the Tokyo Metropolitan government.
社団法人日本薬学会の論文
2007-12-01