title: Enzyme-linked immunosorbent assay for subclass distribution of human IgG and IgA antigen-specific antibodies.
abstract: In this study we describe an ELISA using monoclonal antibodies to IgG 1, 2, 3, 4, IgA1 and IgA2 for determining the subclass distribution of human-specific antibodies. No cross-reactivity of the subclass-specific reagents under the conditions used was observed. The sensitivity was 0.5 ng/ml for IgG1, 3, 4; 1.5 ng/ml for IgG2 and 50 ng/ml for IgA1 and IgA2. The reproducibility as described by the coefficient of variation calculated on repeated runs was 8-26% if the data were obtained by relating the absorbance values to a positive serum run in the assay, 17-58% when relating the OD figures to those of a standard myeloma plate. The method may be considered semiquantitative with high sensitivity and specificity, easy to handle and with small day-to-day variation. The assay has been applied to a number of antigens of protein and polysaccharide nature.
mesh_terms: D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D000941:Antigens / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007070:Immunoglobulin A / Q000145:classification / Q000276:immunology*; D007074:Immunoglobulin G / Q000145:classification / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000941:Antigens; D007070:Immunoglobulin A; D007074:Immunoglobulin G