title: Immunoblot analysis of human IgM, IgG and IgA responses to plasmid-encoded antigens of Yersinia enterocolitica serovar O3.
abstract: Human IgM, IgG and IgA responses after infection with Yersinia enterocolitica serovar O3 were studied by immunoblotting sera against whole-cell homogenates of a plasmid-containing strain of Y. enterocolitica O3 and a plasmid-free strain derived from it; each strain was grown in conditions expressive for the plasmid. The antibodies observed were directed against several plasmid-encoded polypeptides. The response against different bacterial components decreased uniformly with time and the persisting antibody production was directed against several epitopes. Strong reactions to the prominent plasmid-specified antigens of mol. wts (10(3] 26, 34, 45 and 52.5 were found more often with IgG-class antibodies than with IgM or IgA; the latter immunoglobulins recognised, respectively, antigens of mol. wt (10(3] 26 and 45 (IgM) and 26, 34 and 52.5 (IgA). Immunoblotting of sera from patients with yersinia-triggered reactive arthritis did not reveal any antigens that were involved additionally or specifically. However, IgA-mediated recognition of certain antigens of mol. wts (10(3] 26, 34 and 52.5 tended to persist longer in the arthritic patients.
mesh_terms: D000293:Adolescent; D000328:Adult; D000942:Antigens, Bacterial / Q000235:genetics / Q000276:immunology*; D001170:Arthritis, Infectious / Q000276:immunology; D004591:Electrophoresis, Polyacrylamide Gel; D000939:Epitopes / Q000235:genetics / Q000276:immunology; D005260:Female; D006801:Humans; D007118:Immunoassay; D007070:Immunoglobulin A / Q000096:biosynthesis; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007136:Immunoglobulins / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D010957:Plasmids; D015009:Yersinia Infections / Q000276:immunology*; D015008:Yersinia enterocolitica / Q000235:genetics / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D000939:Epitopes; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007136:Immunoglobulins