title: Homocytotropic and heterocytotropic activity of mouse IgG1 antibodies.
abstract: Mouse anti-ovalbumin antibodies were isolated by affinity chromatography and fractionated in a column of protein A-Sepharose. Three peaks were obtained: peak I that did not bind to protein A, peak II eluted with 0.5 M NaSCN and peak III eluted with 2.0 M NaSCN. Peak I and peak II contained IgG1 but no detectable IgG2 or IgG3, whereas peak II contained IgG2 and IgG3 but no detectable IgG1. Peak I, but not peak II, showed heat-resistant passive cutaneous anaphylactic (PCA) activity in rats, which was absorbed by anti-IgG1 serum but not by anti-IgE. Both peak I and peak II showed heat-resistant PCA activity in mice, that was absorbed by anti-IgG1. Peak III showed PCA activity in guinea pigs but not in mice or rats. These findings suggest that mouse IgG1 can be divided into 2 populations that differ in physicochemical and biological properties.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000145:classification*; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology; D005260:Female; D007073:Immunoglobulin E / Q000276:immunology; D007074:Immunoglobulin G / Q000145:classification*; D008297:Male; D008407:Mast Cells / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D010047:Ovalbumin / Q000276:immunology; D010323:Passive Cutaneous Anaphylaxis; D051381:Rats; D013205:Staphylococcal Protein A / Q000276:immunology
chemical_list: D000906:Antibodies; D000888:Antibodies, Anti-Idiotypic; D007074:Immunoglobulin G; D013205:Staphylococcal Protein A; D007073:Immunoglobulin E; D010047:Ovalbumin