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Generation of Human CD40-activated B cells
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Generation of Human CD40-activated B cells

Published on: October 17, 2009

Regulation of B cell growth and differentiation via CD21 and CD40

K Axcrona1, D Gray, T Leanderson

  • 1Department of Cell and Molecular Biology, Lund University, Sweden. Karol.Axcrona@immuno.lu.se

European Journal of Immunology
|September 1, 1996
PubMed

Insights

Stimulating B cells with various signals up-regulates CD21 and CD23. Co-stimulation with anti-CD40 and anti-CD21 antibodies promotes B cell proliferation and immunoglobulin secretion.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • B cell activation and differentiation are crucial for adaptive immunity.
  • Surface receptors like CD21 and CD23 play roles in B cell responses.
  • T cell help and various stimuli influence B cell function.

Purpose of the Study:

  • To investigate the roles of CD21 and CD23 in B cell activation, proliferation, and differentiation.
  • To explore the synergistic or antagonistic effects of different B cell stimulation methods.

Main Methods:

  • In vitro stimulation of murine splenic B cells using lipopolysaccharide, anti-kappa Sepharose, anti-CD40, and allo-reactive T helper cells.
  • Analysis of CD21 and CD23 surface expression.
  • Assessment of B cell proliferation and differentiation into immunoglobulin-secreting cells.

Main Results:

  • Lipopolysaccharide, anti-kappa Sepharose, anti-CD40, and T helper cells all increased CD21 and CD23 expression on B cells.
  • Soluble or Sepharose-coupled anti-CD21 or anti-CD23 antibodies alone did not induce B cell growth or differentiation.
  • Anti-CD40 stimulation combined with Sepharose-coupled anti-CD21 enhanced B cell proliferation and induced immunoglobulin secretion in some cells.
  • Anti-CD40 antibodies inhibited lipopolysaccharide-induced immunoglobulin secretion, suggesting a dominant negative role.

Conclusions:

  • CD21 and CD23 expression is broadly up-regulated by various B cell stimuli.
  • Co-stimulation via CD40 and CD21 can synergistically promote B cell proliferation and differentiation.
  • CD40 signaling can act as a dominant negative regulator of B cell differentiation induced by other pathways.

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