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Related Experiment Videos

Ankylosing spondylitis: an autoimmune disease?

H J Lakomek1, M Plomann, C Specker

  • 1Department of Medicine, Endocrinology and Rheumatology, Heinrich-Heine-Universität Düsseldorf, Germany.

Annals of the Rheumatic Diseases
|November 1, 1991
PubMed
Summary

Researchers identified novel autoantibodies in ankylosing spondylitis (AS) patients. A specific 36 kD antigen antibody was found in 34% of AS patients, distinguishing them from healthy controls and rheumatoid arthritis patients.

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Area of Science:

  • Immunology
  • Rheumatology
  • Biochemistry

Background:

  • Ankylosing spondylitis (AS) is a chronic inflammatory disease primarily affecting the spine.
  • Diagnostic challenges exist, particularly in differentiating AS from other spondylarthropathies.
  • The identification of specific biomarkers is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To identify and characterize autoantibodies in patients with ankylosing spondylitis (AS) or suspected AS.
  • To determine the specificity and prevalence of identified autoantibodies in AS and related conditions.
  • To investigate the potential of these autoantibodies as diagnostic markers for AS.

Main Methods:

  • Cytoimmunofluorescence and immunoblotting techniques were employed.

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  • Antigen pools from insect tissue were used for antibody screening.
  • Purification and isolation of a specific 36 kD Drosophila antigen were performed.
  • Reactivity of antibodies with human lymphocyte and HeLa cell proteins was assessed.

    • Main Results:

    • Five autoantibodies associated with AS were identified.
    • A 36 kD Drosophila antigen showed the most frequent reaction, detected in 34% of definite AS patients and 28% of suspected AS patients.
    • The 36 kD antibody was absent in rheumatoid arthritis patients and healthy controls.
    • The antibody prevalence was similar in HLA-B27 positive and negative AS patients.
    • The immunoreaction was also observed in 'seronegative' spondylarthropathies resembling AS.

    Conclusions:

    • A specific 36 kD antibody may serve as a biomarker for ankylosing spondylitis and related 'seronegative' spondylarthropathies.
    • This autoantibody offers potential for improved diagnostic accuracy in AS.
    • The findings suggest a common immunopathological mechanism in AS and certain 'seronegative' spondylarthropathies.