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Cutting edge: human B cell function is regulated by interaction with soluble CD14: opposite effects on IgG1 and IgE

M A Arias1, J E Rey Nores, N Vita

  • 1Department of Medicine, University of Wales, College of Medicine, Cardiff, United Kingdom.

Journal of Immunology (Baltimore, Md. : 1950)
|March 22, 2000
PubMed

Insights

Soluble CD14 (sCD14) interacts with B cells, influencing antibody production and immune signaling. This soluble factor modulates both cellular and humoral immune responses by engaging T and B cells directly.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The precise mechanisms governing naive B cell activation, proliferation, affinity maturation, isotype switching, and differentiation into memory or plasma cells remain incompletely understood.
  • Soluble CD14 (sCD14) is a recognized component of the immune system, but its direct interactions with B cells and their functional consequences are not fully elucidated.

Purpose of the Study:

  • To investigate the binding of soluble CD14 (sCD14) to B cells and determine its effects on B cell activation, antibody production, and immune signaling pathways.
  • To explore the role of sCD14 as a potential regulator of both cellular and humoral immune responses.

Main Methods:

  • Flow cytometry was used to assess the binding of sCD14 to CD19+ cells in peripheral blood mononuclear cells (PBMC) and tonsillar B cells.
  • Immunoglobulin production (IgG1, IgE) was measured following B cell activation in the presence or absence of sCD14.
  • Analysis of CD40 signaling, IL-6 production, and CD40 ligand expression on T cells was performed to understand the molecular mechanisms involved.

Main Results:

  • Between 24% and 60% of CD19+ cells in PBMC and a subset of tonsillar B cells (preferentially CD38-ve/low) were found to bind sCD14.
  • Interaction of sCD14 with B cells led to increased IgG1 levels and significant inhibition of IgE production in activated cells.
  • sCD14 was observed to interfere with CD40 signaling in B cells, reduce IL-6 production, and enhance CD40 ligand expression on T cells.

Conclusions:

  • Soluble CD14 (sCD14) directly interacts with B cells, modulating key aspects of their activation and function.
  • sCD14 influences antibody isotype switching, favoring IgG1 production while suppressing IgE.
  • These findings establish sCD14 as a novel soluble regulatory factor with the capacity to modulate cellular and humoral immunity through direct interaction with T and B cells.

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