CHEMBL3705595

Radioligand Binding Assays: The CB1 and CB2 radioligand binding assays described herein are utilized to ascertain the selectivity of compounds of the present application for binding to CB2 relative to CB1 receptors.HEK293 cells stably expressing human CB2 receptors were grown until a confluent monolayer was formed. Briefly, the cells were harvested and homogenized in TE buffer (50 mM Tris-HCl, 1 mM MgCl2, and 1 mM EDTA) using a polytron for 210 second bursts in the presence of protease inhibitors, followed by centrifugation at 45,000xg for 20 minutes. The final membrane pellet was re-homogenized in storage buffer (50 mM Tris-HCl, 1 mM MgCl2, and 1 mM EDTA and 10% sucrose) and frozen at -78 C. until used. Saturation binding reactions were initiated by the addition of membrane preparation (protein concentration of 5 ug/well for human CB2) into wells of a deep well plate containing [3H]CP 55,940 (120 Ci/mmol, a nonselective CB agonist commercially available from Tocris) in assay buffer.