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Related Experiment Videos

CD40 and IL-4 regulate murine CD27L expression

U F Hartwig1, L Karlsson, P A Peterson

  • 1Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|April 29, 1998
PubMed
Summary
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The CD27-CD27 ligand (CD27L) pathway regulates T cell activity. This study shows CD27L expression on B cells is modulated by activation signals and cytokines like IL-4, potentially directing T cell responses.

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • T cell effector activity is regulated by accessory molecules on T cells and their ligands on antigen-presenting cells (APCs).
  • Understanding the factors controlling these molecular interactions is crucial for determining T cell activation outcomes.

Purpose of the Study:

  • To investigate the expression patterns of the murine ligand for CD27 (CD27L), a key costimulatory molecule on T cells.
  • To elucidate how B cell activation and cytokine signaling influence CD27L expression.

Main Methods:

  • Examined CD27L expression on resting and activated B cells using various activation methods (LPS, anti-IgM Ab).
  • Investigated the effect of CD40 coligation on CD27L expression in activated B cells.
  • Assessed the impact of different cytokines (IL-4, TGF, IL-2, IL-10, IFN-gamma) on CD27L upregulation.

Related Experiment Videos

Main Results:

  • CD27L is expressed at low levels on resting B cells and increases upon activation with LPS or anti-IgM.
  • CD40 coligation down-regulates CD27L on LPS-activated B cells but not on anti-Ig-activated cells.
  • IL-4 and TGF prevent CD27L upregulation on activated B cells, while IL-2, IL-10, and IFN-gamma do not.

Conclusions:

  • CD27-CD27L costimulation may be restricted to antigen-specific B cells interacting via their Ig receptors.
  • IL-4's ability to inhibit CD27L expression could limit CD27-CD27L interactions to T helper 1 (Th1) type T cell responses.