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Related Experiment Videos

Epidermal autoantibodies in erythema multiforme.

L Y Matsuoka1, J Wortsman, J R Stanley

  • 1Department of Dermatology, Jefferson Medical College, Philadelphia, PA 19107.

Journal of the American Academy of Dermatology
|October 1, 1989
PubMed
Summary

Refractory erythema multiforme in a patient with T cell lymphoma was linked to unusual autoantibodies. These antibodies mimicked pemphigus vulgaris but targeted different epidermal antigens, potentially causing false-positive test results.

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Area of Science:

  • Dermatology
  • Immunology
  • Oncology

Background:

  • Erythema multiforme (EM) is an acute, immune-mediated condition often triggered by infections or medications.
  • Refractory cases necessitate a thorough investigation into underlying causes and diagnostic methodologies.
  • Pemphigus vulgaris (PV) is an autoimmune blistering disease characterized by specific autoantibodies against desmogleins.

Observation:

  • A 63-year-old woman presented with refractory EM and a mediastinal T cell lymphoma.
  • Immunofluorescence studies revealed high serum antibody titers against epidermal keratinocytes, resembling the pattern of PV.
  • However, antigen characterization showed antibodies precipitated multiple keratinocyte proteins, excluding the 130,000- and 85,000-dalton polypeptides typical of PV.

Findings:

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  • The patient's autoantibodies reacted selectively with non-PV epidermal keratinocyte antigens.
  • This atypical antibody profile may explain the false-positive immunofluorescence test results for PV.
  • The presence of T cell lymphoma may be associated with the development of these unusual autoantibodies.

Implications:

  • This case highlights the importance of detailed antigen characterization in diagnosing autoimmune dermatological conditions.
  • Atypical autoantibody profiles can lead to misdiagnosis, emphasizing the need for advanced immunological assays.
  • Understanding these novel autoantibodies may offer new insights into EM pathogenesis and its association with hematological malignancies.