title: Binding of C-reactive protein to human neutrophils.
abstract: The binding of radiolabelled 125I-CRP to human neutrophils has been characterised according to pH, temperature and time dependence. The binding of 125I-CRP was saturable, very fast (less than 2 min at 22 C), and the labelled protein was displaced by unlabelled CRP and aggregated human IgG. The dissociation constant was 3.2 X 10(-8) M at pH 7.4, 22 degrees C and 8.8 X 10(-8) M at pH 6.0, 22 degrees C. The calculated number of binding sites was 5-20 X 10(4) per cell at pH 7.4, 22 degrees C. An association with an Fc-type receptor is suggested, since aggregated IgG was able to displace specifically CRP.
mesh_terms: D001667:Binding, Competitive; D002097:C-Reactive Protein / Q000378:metabolism*; D006801:Humans; D007074:Immunoglobulin G / Q000378:metabolism; D007457:Iodine Radioisotopes; D007700:Kinetics; D009504:Neutrophils / Q000378:metabolism*
chemical_list: D007074:Immunoglobulin G; D007457:Iodine Radioisotopes; D002097:C-Reactive Protein