CHEMBL5732255

In Vitro Human FAAH Fluorescent Assay: Human recombinant FAAH was obtained from a HEK-293 FAAH-1 overexpressing stable cell line. Cells were grown in DMEM medium containing 10% FBS, 1% pen/strep, 1% glutamine and 500 μg/mL G418. To obtain membrane preparation cells were scraped off with cold phosphate-buffered saline (PBS) and collected by centrifugation (500×g, 10 minutes, 4° C.); the cell pellet was re-suspended in 20 mM Tris-HCl pH 7.4, 0.32 M sucrose, disrupted by sonication (10 pulses, 5 times) and centrifuged (800×g, 15 minutes, 4° C.); the collected supernatant was centrifuged at 105,000×g for 1 h at 4° C. and the pellet was re-suspended in PBS.The fluorescent assay to measure FAAH activity was performed in 96 wells black plates: 2.5 μg of human FAAH-1 membrane preparation were pre-incubated for 50 minutes at 37° C., in 180 μL of assay buffer (50 mM TrisHCl pH 7.4, 0.05% Fatty acid-free BSA) with 10 μL of inhibitor or 10 μL DMSO to measure FAAH total activity. The background (no activity) samples were prepared using 180 μL of assay buffer without human FAAH-1 and 10 μL of DMSO. The reaction was then started by the addition of 10 μL of substrate (AMC arachidonyl amide, N. 10005098, Cayman Chemical) dissolved in ethanol and used at a final concentration of 2 μM. The reaction was carried out for 30 minutes at 37° C. and fluorescence was measured with a Tecan Infinite M200 nanoquant plate reader (excitation wavelength 350 nm/emission wavelength 460 nm).