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Related Experiment Videos

LFA-1 subunit expression in ulcerative colitis patients

I Kirman1, O H Nielsen

  • 1Cornell Medical College, Department of Medicine, New York, NY 10021, USA.

Digestive Diseases and Sciences
|April 1, 1996
PubMed
Summary
This summary is machine-generated.

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In ulcerative colitis (UC) patients, reduced levels of CD11hi/CD18hi T cells are seen in quiescent disease. Active UC shows increased CD11ahi T cells expressing IL-2R alpha, indicating sustained T-cell activation.

Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • Lymphocyte function associated antigen (LFA-1) is crucial for lymphocyte migration and effector functions.
  • Previous studies found no difference in LFA-1 expression in circulating lymphocytes between ulcerative colitis (UC) patients and controls.
  • This study investigates specific subsets of circulating LFA-1+ lymphocytes in UC patients.

Purpose of the Study:

  • To analyze the percentages of CD11a and CD18 expressing T and B cell subsets in UC patients.
  • To examine CD25 expression on these circulating lymphocyte subsets.
  • To correlate LFA-1 expression patterns with disease activity in UC.

Main Methods:

  • Peripheral blood mononuclear cells were isolated from 16 UC patients and 10 healthy controls.

Related Experiment Videos

  • Double staining with monoclonal antibodies and panning procedures were used.
  • Flow cytometry was employed to analyze percentages of CD11alo, CD11ahi, CD18lo, CD18hi T and B cells, and CD25 expression.

    • Main Results:

    • A significant decrease in CD11hi and CD18hi T cells was observed in quiescent UC patients compared to active disease patients and healthy controls.
    • The majority of CD25+ T cells expressed low-density CD11a and CD18.
    • A subset of CD11ahiCD25+ T cells (1-6%) was found in moderate to severe active UC patients, but not in inactive UC or controls.

    Conclusions:

    • Decreased CD11ahi and CD18hi T cells in peripheral blood of quiescent UC patients may be linked to treatment effects.
    • Increased CD11ahiIL-2R alpha+ T cells in active UC patients suggest persistent T-cell activation due to ongoing inflammation.