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Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy
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[Extensive digital necrosis during dermatomyositis associated with MDA-5 antibodies]
L Charbit1, A-C Bursztejn1, S Mohamed2
1Département de dermatologie et allergologie, CHU de Nancy, rue du Morvan, 54500 Vandœuvre-lès-Nancy, France.
Annales De Dermatologie Et De Venereologie
|May 10, 2016
Summary
Dermatomyositis with anti-MDA-5 antibodies can cause severe lung disease and digital necrosis. Early screening for anti-MDA-5 antibodies is crucial for patients with specific skin lesions to manage pulmonary risks.
Area of Science:
- Rheumatology
- Immunology
- Dermatology
Background:
- Dermatomyositis (DM) is an inflammatory condition often linked to autoantibodies.
- Anti-MDA-5 antibodies are associated with a DM subtype characterized by severe interstitial lung disease and minimal muscle involvement.
Observation:
- A 28-year-old male presented with fatigue, muscle pain, and shortness of breath.
- He exhibited characteristic skin lesions, including digital edema, purpuric/cyanotic areas, and Gottron's papules.
- Despite initial corticosteroid treatment, his condition worsened, leading to pulmonary fibrosis and extensive digital necrosis.
Findings:
- Immunoprecipitation confirmed the presence of anti-MDA-5 antibodies.
- The patient's condition was resistant to cyclophosphamide and immunoglobulin but stabilized with cyclosporine.
- Anti-MDA-5 antibodies are a risk factor for severe interstitial lung disease (70% of cases) and mortality (40%) in DM.
Implications:
- This case highlights the first report of DM with anti-MDA-5 antibodies, interstitial lung disease, and rapidly extensive digital necrosis.
- The specific cutaneous presentation includes palmar papules and mucocutaneous ulceration.
- Screening for anti-MDA-5 antibodies is recommended for DM patients with concerning clinical signs due to significant pulmonary risks.
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