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Levo-Tetrahydroberberrubine Produces Anxiolytic-Like Effects in Mice through the 5-HT1A Receptor.

PLoS One.. 2017-01; 
Mi G, Liu S, Zhang J, Liang H, Gao Y, Li N, Yu B, Yang H, Yang Z. Beijing Institute of Basic Medical Sciences, Haidian District, Beijing, China.
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Abstract

Tetrahydroprotoberberines (THPBs) are isoquinoline alkaloids isolated from the Chinese herb Corydalis yanhusuo. In the present study, we performed competitive binding assays to examine the binding of l-THBr to neurotransmitter receptors known to be involved in sedation, hypnosis and anxiety. Our results show that l-THBr does not interact with GABAergic receptors but has binding affinities for dopamine and serotonin receptors. In addition, cAMP and [35S]GTPγS assays were used to determine the agonist or antagonist properties of l-THBr at dopamine (D1, D2) or serotonin (5-HT) receptors. Our results show that l-THBr displays D1 and D2 antagonist and 5-HT1A agonist properties. Moreover, l-THBr-treated rodents... More

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