title: Expression of interferon beta in synovial tissue from patients with rheumatoid arthritis: comparison with patients with osteoarthritis and reactive arthritis.
abstract: BACKGROUND
  IFNbeta may have immunomodulatory effects in rheumatoid arthritis (RA) and its increased production in RA synovium may be a reactive attempt to inhibit inflammation.
  
  
  OBJECTIVE
  To determine the expression of IFNbeta in the synovial tissue of patients with RA, osteoarthritis, and reactive arthritis.
  
  
  METHODS
  Synovial biopsy specimens were obtained by arthroscopy from patients with RA and disease controls for immunohistological analysis using a monoclonal antibody specific for IFNbeta. Bound antibody was detected by an immunoperoxidase method. Stained sections were evaluated by computer assisted image analysis. Double stainings were performed with antibodies to detect CD55 positive fibroblast-like synoviocytes (FLS), CD68 positive macrophages, and CD83 positive dendritic cells (DCs) co-expressing IFNbeta.
  
  
  RESULTS
  IFNbeta protein was abundantly expressed in the synovium of patients with RA. Digital image analysis showed a significant increase in the mean integrated optical density for IFNbeta expression in RA synovial tissue compared with disease controls. Specific up regulation of IFNbeta expression was also seen when the results were controlled for cell numbers. Phenotypic analysis showed that FLS, especially, but also macrophages and DCs may express IFNbeta in RA synovial tissue.
  
  
  CONCLUSIONS
  The increased expression of IFNbeta in RA synovium suggests activation of an immunomodulatory mechanism that could inhibit synovial inflammation.
authors.affiliation: Division of Clinical Immunology and Rheumatology F4-218, Academic Medical Centre, PO Box 22700, 1100 DE Amsterdam, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: van Holten
authors.forename: T J M
authors.initials: TJ
authors.lastname: Smeets
authors.forename: P
authors.initials: P
authors.lastname: Blankert
authors.forename: P P
authors.initials: PP
authors.lastname: Tak
mesh_terms: D000328:Adult; D000368:Aged; D016918:Arthritis, Reactive / Q000276:immunology; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology; D005260:Female; D005347:Fibroblasts / Q000276:immunology; D006801:Humans; D007124:Immunoenzyme Techniques; D016899:Interferon-beta / Q000378:metabolism*; D007719:Knee Joint / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000276:immunology; D013583:Synovial Membrane / Q000276:immunology*
chemical_list: D016899:Interferon-beta