In Vitro Characterization of Psychoactive Substances at Rat, Mouse, and Human Trace Amine-Associated Receptor 1

The Journal of Pharmacology and Experimental Therapeutics
L D SimmlerM E Liechti

Abstract

Trace amine-associated receptor 1 (TAAR1) has been implicated in the behavioral effects of amphetamine-type stimulant drugs in rodents. TAAR1 has also been suggested as a target for novel medications to treat psychostimulant addiction. We previously reported that binding affinities at TAAR1 can differ between structural analogs of psychostimulants, and species differences have been observed. In this study, we complement our previous findings with additional substances and the determination of functional activation potencies. In summary, we present here pharmacological in vitro profiles of 101 psychoactive substances at human, rat, and mouse TAAR1. p-Tyramine, β-phenylethylamine, and tryptamine were included as endogenous comparator compounds. Functional cAMP measurements and radioligand displacement assays were conducted with human embryonic kidney 293 cells that expressed human, rat, or mouse TAAR1. Most amphetamines, phenethylamine, and aminoindanes exhibited potentially physiologically relevant rat and mouse TAAR1 activation (EC50 < 5 µM) and showed full or partial (Emax < 80%) agonist properties. Cathinone derivatives, including mephedrone and methylenedioxypyrovalerone, exhibited weak (EC50 = 5-10 µM) to negligible (EC50 >...Continue Reading

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Citations

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