title: Monoclonal antibody to human renal glomeruli cross-reacts with streptococcal M protein.
abstract: Two murine monoclonal antibodies (immunoglobulin M) evoked against human kidney tissue were examined for cross-reactivity with group A streptococci. A glomerulus-specific antibody, PMII.40.H.2, cross-reacted in an enzyme-linked immunosorbent assay with purified pepsin-extracted M proteins from type 6 and 12 streptococci, but not type 1, 3, 5, 19, and 24 M proteins. The cross-reactive monoclonal antibody also opsonized type 6 and 12 streptococci, indicating that it was directed against protective M protein epitopes that were exposed on the surfaces of these organisms. A control antibody, which was tubule specific, did not cross-react with any of the purified M proteins, nor did it opsonize any of the serotypes of streptococci tested. Western immunoblot experiments identified the glomerular cross-reactive antigen as a 43-kilodalton protein. The results demonstrate that M protein of group A streptococci and glomerular antigens of the human kidney possess cross-reactive determinants.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000942:Antigens, Bacterial / Q000276:immunology*; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins / Q000276:immunology*; D002352:Carrier Proteins; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology; D005455:Fluorescent Antibody Technique; D006801:Humans; D007118:Immunoassay; D007678:Kidney Glomerulus / Q000276:immunology*; D009895:Opsonin Proteins; D010587:Phagocytosis; D013297:Streptococcus pyogenes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; D000939:Epitopes; D009895:Opsonin Proteins; C014689:streptococcal M protein