Anti-keratin antibodies in rheumatoid arthritis: frequency and correlation with other features of the disease

Clin Exp Immunol. 1983 Jan;51(1):17-20.


Anti-keratin antibodies (AKA) were detected in 68 out of 98 patients (69%) with classical or definite rheumatoid arthritis (RA). The intensity of the AKA reaction correlated significantly with articular index (AI), grip strength (GS), erythrocyte sedimentation rate (ESR), serum C-reactive protein (CRP) concentration, serum amyloid A (SAA) protein concentration, the level of antibodies against single stranded DNA (ssDNA) and the IgM rheumatoid factor (RF) titre. A significantly higher number of patients with nodules and Sjögren's syndrome were AKA positive compared with patients without extra-articular features (EAFs) and the AKA titre was significantly greater in the former group. The mechanisms underlying appearance of AKA are not known but may relate to an as yet unidentified structural alteration of keratin in this disease or may just reflect the rheumatoid autoimmune diathesis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Arthritis, Rheumatoid / immunology*
  • Arthritis, Rheumatoid / physiopathology
  • Autoantibodies / analysis*
  • Blood Sedimentation
  • C-Reactive Protein / analysis
  • DNA, Single-Stranded / immunology
  • Female
  • Humans
  • Keratins / immunology*
  • Male
  • Middle Aged
  • Rheumatoid Factor / analysis
  • Serum Amyloid A Protein / analysis


  • Autoantibodies
  • DNA, Single-Stranded
  • Serum Amyloid A Protein
  • Keratins
  • C-Reactive Protein
  • Rheumatoid Factor