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Comparison of [3H]YM060 binding to native and cloned rat 5-HT3 receptors
S Akuzawa1, A Miyake, K Miyata
1Department of Internal Medicine, University of Tsukuba, Ibaraki, Japan.
Abstract:
We characterized [3H]YM060 ([methyl-3H]-(-)-(R)-5-[(methyl-1H- indol-3-yl)carbonyl]-4,5,6,7-tetrahydro-1H-benzimidazole monohydrochloride) binding in membrane homogenates prepared from three different rat tissues (cerebral cortex, ileum and colon), and compared the binding characteristics between the native and cloned rat 5-HT3 receptors. The dissociation constant (Kd) of [3H]YM060 was similar in all membranes. In competition studies, the affinity of 5-HT3 receptor agonists and antagonists was similar between the native and the cloned rat 5-HT3 receptors. In conclusion, intra-species difference of 5-HT3 receptor was not observed in rats and pharmacological properties of the cloned rat 5-HT3 receptor were nearly identical to that of the native rat 5-HT3 receptor.