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The association between Mi-2 antibodies and dermatomyositis
Arthritis and Rheumatism
|July 1, 1985
Summary
Researchers identified anti-Mi-2 antibodies in patients with myositis. This antibody appears to be a specific serologic marker, particularly for dermatomyositis (DM), distinguishing it from polymyositis (PM).
Area of Science:
- Immunology
- Autoimmunity
- Biochemistry
Background:
- Myositis encompasses polymyositis (PM) and dermatomyositis (DM), autoimmune diseases affecting muscles.
- Previous studies indicated antibodies to Mi antigen in myositis sera, but specific markers remained elusive.
- The anti-Mi-2 antibody was identified as the complement-fixing component within the Mi antigen system.
Purpose of the Study:
- To further characterize and quantify the anti-Mi-2 antibody.
- To determine the diagnostic significance of anti-Mi-2 antibodies in differentiating DM from PM.
- To establish anti-Mi-2 as a specific serologic marker for dermatomyositis.
Main Methods:
- Purification of Mi-2 antigen using immuno-affinity chromatography.
- Development of an enzyme-linked immunosorbent assay (ELISA) for anti-Mi-2 antibody detection.
- Testing of sera from 139 myositis patients (52 DM, 87 PM) and 128 controls (35 normal, 93 other connective tissue diseases) using ELISA and immunodiffusion (ID).
Main Results:
- Anti-Mi-2 antibodies were detected in 13 sera, all from myositis patients, with 11 from DM patients.
- Anti-Mi-2 was found by ID exclusively in DM sera, and all ID-positive sera were ELISA-positive.
- Detection of anti-Mi-2 was significantly more frequent in DM than in PM, suggesting a strong association with DM.
Conclusions:
- Anti-Mi-2 antibody is a specific serologic marker for dermatomyositis.
- The presence of anti-Mi-2 antibodies can aid in differentiating DM from PM.
- Further research may elucidate the role of anti-Mi-2 in the pathogenesis of DM.