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Related Experiment Videos

Interleukin 4 induces membrane Thy-1 expression on normal murine B cells.

C M Snapper1, P V Hornbeck, U Atasoy

  • 1Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892.

Proceedings of the National Academy of Sciences of the United States of America
|August 1, 1988
PubMed
Summary

Interleukin 4 (IL-4) induces Thy-1 expression on lipopolysaccharide (LPS)-stimulated B cells, identifying them as precursors for immunoglobulin-secreting cells. Interferon-gamma inhibits this induction, while anti-IL-4 antibodies block T-cell-mediated Thy-1 induction on B cells.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Thy-1 is a cell-surface glycoprotein found on mouse thymocytes, T cells, and neurons, commonly used to distinguish T cells from B cells.
  • The precise function of Thy-1 remains largely undetermined.
  • B cells are crucial for humoral immunity, producing antibodies.

Purpose of the Study:

  • To investigate the regulation of Thy-1 expression on murine B cells.
  • To determine the role of Interleukin 4 (IL-4) in Thy-1 induction on B cells.
  • To explore the functional implications of Thy-1 expression on B cells.

Main Methods:

  • Stimulation of normal murine B cells with lipopolysaccharide (LPS) and recombinant Interleukin 4 (IL-4).
  • Analysis of Thy-1 membrane expression using flow cytometry.

Related Experiment Videos

  • RNA blot analysis to detect Thy-1 mRNA expression.
  • Cell mixing experiments to assess passive absorption.
  • Inhibition studies using recombinant interferon-gamma and anti-IL-4 monoclonal antibody.

    • Main Results:

    • Recombinant IL-4 significantly induces membrane expression of Thy-1 on the majority of LPS-stimulated murine B cells across five strains.
    • Thy-1+ B cells identified through this process are precursors for immunoglobulin-secreting cells.
    • B cells express a 1.8 kb Thy-1 mRNA, consistent with that found in T cells.
    • Recombinant interferon-gamma inhibits IL-4-induced Thy-1 expression on LPS-stimulated B cells.
    • Thy-1 is also induced on B cells activated via IL-4-producing T-helper clones, and this induction is inhibited by anti-IL-4 antibodies.

    Conclusions:

    • IL-4 is a potent inducer of Thy-1 expression on activated murine B cells.
    • Thy-1 expression on B cells marks precursors for antibody-secreting cells.
    • Interferon-gamma and IL-4-mediated T-cell help play regulatory roles in B-cell Thy-1 expression.