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T cell antigen receptors in autoimmunity.

D N Posnett1, A Gottlieb, J B Bussel

  • 1Department of Medicine, Hospital for Special Surgery, New York.

Journal of Immunology (Baltimore, Md. : 1950)
|September 15, 1988
PubMed
Summary

Researchers analyzed T-cell receptor (TCR) variable regions in autoimmune diseases. They identified a monoclonal expansion of CD8+ T cells in one patient with idiopathic thrombocytopenic purpura (ITP), suggesting a potential role in disease pathogenesis.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Autoimmunity

Background:

  • T-cell receptors (TCRs) mediate antigen recognition and are crucial for adaptive immunity.
  • Autoimmune diseases arise from aberrant immune responses against self-antigens.
  • Analyzing TCR variable regions can provide insights into T-cell populations and their potential role in disease.

Observation:

  • Three monoclonal antibodies (mAbs) targeting TCR variable region determinants were used to identify distinct peripheral blood T-cell populations.
  • T-cell populations were analyzed in patients with various autoimmune diseases (e.g., rheumatoid arthritis, Graves' disease, SLE) and control groups.
  • One patient with adult idiopathic thrombocytopenic purpura (ITP) exhibited consistently elevated percentages of CD8+ T cells positive for the OT145 mAb over a 12-month period.

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Findings:

  • Southern blot analysis revealed a clonal rearrangement in the DNA of OT145+, CD8+ T cells from the ITP patient, indicating a monoclonal expansion.
  • No significant association was found between the overexpression of specific TCR variable regions and the studied autoimmune diseases.
  • T cells from autoimmune sites (e.g., rheumatoid arthritis synovial fluid) and psoriatic lesions did not show striking enrichment of T cells bearing the studied TCR types.

Implications:

  • The findings suggest that monoclonal T-cell expansions, particularly CD8+ T cells, may play a role in certain autoimmune conditions like ITP.
  • This study highlights the utility of mAbs targeting TCR variable regions as tools for investigating T-cell gene usage and identifying clonal expansions.
  • Further research is warranted to explore the specific antigens recognized by these expanded T-cell clones and their contribution to autoimmune pathogenesis.