Radio Ligand Binding Assay: Serial dilutions of compounds (stock in 10 mM DMSO) are prepared by first diluting the compounds in DMSO followed by a 1:50 dilution into assay buffer (10 mM HEPES, pH 8.0, 100 mM NaCl, 5 mM MgCl2, 1 mM CaCl2, 0.5% fatty acid-free BSA, 0.05% Tween-20). The radioligand [3H]4 (example 39) (specific activity 1500 GBq/mmol) is diluted directly into the assay buffer immediately before use to obtain a 20 nM solution. The desired amount of membranes (20 μg/well) is diluted with assay buffer. 50 μL of pre-diluted compound and 50 μL of [3H]4 (example 39) is placed into the bottom of a 96-well well plate. 100 μL of the membrane-suspension is added and the plate stirred for 60 minutes. The reaction is stopped by transfer onto the filter of a 96-well GF/C filter plate (soaked for 1 hour in 0.25% PEI) using a cell harvester.
Antagonist activity at human GPR4 expressed in human HeLa cells assessed as inhibition of pH-induced cAMP accumulation preincubated for 15 mins followed by cAMP addition measured after 60 mins by HTRF method
Antagonist activity at mouse GPR4 expressed in HEK cells assessed as inhibition of pH-induced cAMP accumulation preincubated for 15 mins followed by cAMP addition measured after 60 mins by HTRF method
Antagonist activity at rat GPR4 expressed in HEK cells assessed as inhibition of pH-induced cAMP accumulation preincubated for 15 mins followed by cAMP addition measured after 60 mins by HTRF method
In vivo antiangiogenic activity in po bid dosed FVB mouse assessed as inhibition of VEGF-induced angiogenesis administered for 3 days starting from 5 hrs prior to implantation measured on day 4 post implantation
Anti-inflammatory activity in po dosed Lewis rat antigen-induced arthritis model assessed as inhibition of knee swelling administered bid via gavage measured after 7 days
Anti-inflammatory activity in Lewis rat antigen-induced arthritis model assessed as inhibition of joint damage or erosion at 90 mg/kg, po bid administered via gavage measured after 7 days
Antinociceptive activity in CFA-induced Wistar Han rat hyperalgesia model assessed as increase in paw withdrawal threshold at 10 to 30 mg/kg, po administered via gavage on day3 post CFA challenge measured up to 6 hrs post dose
Anti-inflammatory activity in Lewis rat mBSA-induced arthritis model assessed as inhibition of mBSA-induced knee swelling at 10 mg/kg, po, administered bid via gavage measured after 7 days post last dose relative to control
Anti-inflammatory activity in Lewis rat mBSA-induced arthritis model assessed as inhibition of mBSA-induced knee swelling at 30 mg/kg, po, bid administered bid via gavage measured after 7 days post last dose relative to control