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Activated, cytotoxic lymphocytes in systemic vasculitis.

A D Blann1, D G Scott

  • 1Department of Rheumatology, Medical School, Birmingham, UK.

Rheumatology International
|January 1, 1991
PubMed
Summary
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Cytotoxic lymphocytes targeting endothelial cells were found in some patients with rheumatoid vasculitis and giant cell arteritis. This cytotoxicity correlated with Human Leukocyte Antigen - DR (HLA-DR) expression on lymphocytes.

Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Rheumatoid vasculitis and giant cell arteritis are inflammatory conditions affecting blood vessels.
  • The role of specific lymphocyte populations in the pathogenesis of these vasculitides is not fully understood.

Purpose of the Study:

  • To investigate the presence and characteristics of cytotoxic lymphocytes in the peripheral blood of patients with rheumatoid vasculitis and giant cell arteritis.
  • To determine if lymphocyte cytotoxicity is directed against endothelial cells.

Main Methods:

  • Peripheral blood lymphocytes from patients and controls were isolated.
  • In vitro cytotoxicity assays were performed against human endothelial cells and fibroblasts.
  • Cell surface markers, including Human Leukocyte Antigen - DR (HLA-DR), CD3, and transferrin receptor, were analyzed using flow cytometry.

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Main Results:

  • Lymphocytes from a subset of patients with rheumatoid vasculitis and giant cell arteritis exhibited in vitro cytotoxicity towards endothelial cells.
  • This cytotoxicity did not extend to fibroblasts.
  • The cytotoxic activity correlated significantly with the number of HLA-DR bearing lymphocytes.

Conclusions:

  • Activated, cytotoxic lymphocytes targeting endothelial cells are present in the peripheral blood of a subset of patients with vasculitis.
  • HLA-DR expression may serve as a marker for these activated cytotoxic lymphocytes in vasculitis patients.