title: A method for estimation of circulating immune complexes after oral challenge with ovalbumin.
abstract: Sera from forty-two children orally challenged with ovalbumin were analysed for the presence of IgG-ovalbumin immune complexes. The technique used is based on the absorption of the IgG of the complex to immobilized protein-A and detection of the ovalbumin of the complex on the solid phase, using isotope-labelled, pepsin-digested antibodies to ovalbumin. Children with high serum levels of antibody to ovalbumin had significantly higher concentrations of IgG-ovalbumin complexes that children with low antibody levels. In both groups the appearance of the complexes in the serum was accompanied by a significant decrease of the complement factor C3 (P < 0.05). The duration of the decrease in C3 was correlated to the amount of IgG-ovalbumin complexes, suggesting a consumption of C3 by these immune complexes.
mesh_terms: D000284:Administration, Oral; D000906:Antibodies / Q000032:analysis; D000936:Antigen-Antibody Complex / Q000032:analysis*; D002648:Child; D003176:Complement C3 / Q000032:analysis; D003181:Complement C4 / Q000032:analysis; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D010047:Ovalbumin / Q000008:administration & dosage / Q000276:immunology*; D011863:Radioimmunoassay / Q000379:methods*
chemical_list: D000906:Antibodies; D000936:Antigen-Antibody Complex; D003176:Complement C3; D003181:Complement C4; D007074:Immunoglobulin G; D010047:Ovalbumin