FLIPR Assay: Compounds were tested for their ability to inhibit C5a-mediated calcium mobilization using a stable cell line over expressing the human C5aR & the Galpha 15 protein on the FLIPR (Fluorescent Imaging Plate Reader) Tetra system. Cells were maintained in culture media containing DMEM (Dulbecco's Modified Eagle Medium) with 4.5 g/L glucose, 10% fetal bovine serum, 100 U/mL, 1x non-essential amino acid, and 250 ug/mL G418 (Geneticin). Prior to testing of compounds, cells were plated at 10,000 cells/well in clear bottom 384-well black plate, and incubated overnight at 37C. with 5% CO2. On the day of experiment, culture media was removed, and replaced with assay buffer HBSS (Hanks' Balanced Salt Solution) with 20 mM HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) and 0.1% BSA (bovine serum albumin) BSA containing calcium 5 dye (Molecular Devices) and 2.5 mM probenecid. After 1 hour incubation at 37C., 5% CO2 for 60 min, cells were pre-incubated with compounds for 30 minutes.
Compound was evaluated for the antagonistic activity against C5a anaphylatoxin chemotactic receptor in human neutrophil C5a stimulated respiratory burst assay
Compound was tested for its ability to inhibit binding of radiolabeled C5a anaphylatoxin chemotactic receptor to intact membrane bound receptor from human neutrophils.; insoluble
Compound was tested for its ability to inhibit binding of radiolabeled C5a anaphylatoxin chemotactic receptor to intact membrane bound receptor from human neutrophils; insoluble
Tested for the ability to compete with [125I]-CO13 ([125I]-Y-F-K-A-Cha-G-L-dF-R) for binding to C5a anaphylatoxin chemotactic receptor from human neutrophil membrane preparations
Tested for the its ability to compete with [125I]-CO13 [125I]-Y-F-K-A-Cha-G-L-dF-R) for binding to C5a anaphylatoxin chemotactic receptor of human neutrophil membrane preparations
Compound was evaluated for its ability to inhibit the binding of [125I]C5a anaphylatoxin chemotactic receptor to polymorphonuclear leukocyte (PMNL) membrane receptor at 1 mM concentration.