| Assay Method Information | |
| | FAAH Activity |
| Description: | Hydrolysis of [3H]-AEA by FAAH was determined as previously described in cell homogenates of U937 cells (0.18 mg protein) (Omeir et al., 1999, Biochem Biophys Res Commun, 264, 316-20; Mor et al., 2004, J Med Chem, 47, 4998-5008). Protein amounts of cell homogenates corresponded to 0.5×106 cells (U937), to assure best possible comparability of IC50 values as used for the AEA cellular uptake assays. URB597 was used as positive control. Protein quantification was performed using a BCA assay (Thermo Scientific). Enzyme activity was assessed by addition of vehicle or compounds in 10 μL DMSO to 490 μL homogenate in 10 mM Tris HCl, 1 mM EDTA, 0.1% (w/v) BSA fatty acid free, pH=8 and incubation for 15 min at 37° C. After, a mixture of AEA plus [ethanolamine-1-3H]-AEA (0.5 nM) at final 100 nM was added to the homogenates and incubated for 15 min at 37° C. The reaction was stopped by addition of 1 mL ice-cold CHCl3:MeOH (1:1) followed by vigorous vortexing. Phase separation was achieved by centrifugation at 10′000×g at 4° C. for 10 min. Radioactivity of the separated aqueous phase (upper phase) containing [3H-ethanolamine] or [3H-glycerol] was measured by liquid scintillation counting on a Tri-Carb 2100 TR liquid scintillation analyzer after addition of 3.5 mL Ultima Gold scintillation cocktail (PerkinElmer Life Sciences). Results are expressed as hydrolysis of tritium substrate in percent of vehicle treated control. IC50 values were calculated by GraphPad . Data are reported as means of n=3 independent experiments performed in triplicates. |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |