title: Lack of association of increased antibody levels to mycobacterial hsp65 with rheumatoid arthritis: results from a study of disease discordant twin pairs.
abstract: OBJECTIVE
  To investigate the role of humoral immunity to mycobacterial hsp65 in the aetiology of rheumatoid arthritis.
  
  
  METHODS
  Levels of IgG antibodies to recombinant mycobacterial hsp65 were measured by enzyme linked immunosorbent assay (ELISA) in serum samples of 152 twin pairs discordant for RA and in serum samples from 62 normal blood donors.
  
  
  RESULTS
  No significant differences between antibody levels in the subjects with RA compared either with their unaffected twins or with a group of normal blood donors was observed. In the monozygotic twins there was a strong but negative association between levels of antibody to hsp65 and disease status. Zygosity, sex, and HLA status did not significantly affect levels of antibody to hsp65.
  
  
  CONCLUSIONS
  Previous reports of an association between hsp65 and RA were not confirmed.
authors.affiliation: ARC Epidemiology Research Unit, University of Manchester, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Worthington
authors.forename: A S
authors.initials: AS
authors.lastname: Rigby
authors.forename: A J
authors.initials: AJ
authors.lastname: MacGregor
authors.forename: A J
authors.initials: AJ
authors.lastname: Silman
authors.forename: D
authors.initials: D
authors.lastname: Carthy
authors.forename: W E
authors.initials: WE
authors.lastname: Ollier
mesh_terms: D000907:Antibodies, Bacterial / Q000032:analysis*; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D001426:Bacterial Proteins; D018834:Chaperonin 60; D018833:Chaperonins; D004200:Diseases in Twins; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006360:Heat-Shock Proteins / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D009161:Mycobacterium / Q000276:immunology*; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D018834:Chaperonin 60; D006360:Heat-Shock Proteins; D007074:Immunoglobulin G; C074119:heat-shock protein 65, Mycobacterium; D018833:Chaperonins