CHEMBL5732346

Biological Assay: The binding affinity of the compound of this invention to human 5-HT6 receptor expressed in CHO cell was evaluated by radioligand binding assay as follows.32 μg membrane proteins of CHO cell expressing human 5-HT6 receptor, 2 nM of radioactive marker [3H]LSD, the compound of the present invention having different test concentrations and a buffer solution were mixed uniformly, and the resulting mixture was incubated at 37° C. for 120 mins, in which the buffer solution was comprised of 50 mM Tris-HCl (pH 7.4), 10 mM MgCl2, 0.5 mM EDTA, 10 μM pargyline and 20 mg/L protease inhibitor.100 μM of 5-HT was added to the mixture to eliminate nonspecific binding sites. After incubation, the resulting mixture was filtered with glassfabricfilter in vacuo, and the glassfabricfilter should be preimpregnated with 0.3% PEI before filtering and washed with 50 mM of Tris-HCl several times after filtering. After the filter was dried, the radioactivity of the scintillation mixture was determined by liquid scintillation counting with a scintillometer. The reference standard was 5-HT, and IC50 values were calculated from plots of competitive inhibition curves formed based on several inhibition ratios and the corresponding compound concentrations.