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Role of cytokines in human B lymphocyte growth and differentiation

J Banchereau1, D Blanchard, F Brière

  • 1Schering-Plough, Laboratory for Immunological Research, Dardilly, France.

Nouvelle Revue Francaise D'Hematologie
|February 1, 1993
PubMed

Insights

CD40 activation on B cells drives proliferation and differentiation. This interaction with T cells is crucial for B cell activation, leading to immunoglobulin secretion and isotype switching.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • B lymphocytes express the CD40 antigen, a member of the NGF receptor superfamily.
  • CD40 plays a critical role in B cell activation and immune responses.

Purpose of the Study:

  • To investigate the effects of CD40 crosslinking on B cell activation, proliferation, and differentiation.
  • To explore the role of cytokines (IL-4, IL-10, TGF-beta) in modulating CD40-mediated B cell responses.
  • To elucidate the interaction between CD40 on B cells and its ligand on T cells.

Main Methods:

  • Crosslinking of CD40 on resting B lymphocytes using a mouse fibroblastic cell line expressing Fc gamma RII/CDw32 and anti-CD40 monoclonal antibody.
  • Addition of cytokines (IL-4, IL-10, TGF-beta) to stimulated B cell cultures.
  • Analysis of B cell proliferation, differentiation into plasma cells, immunoglobulin secretion, and isotype switching.
  • Characterization of the interaction between CD40 and its ligand on T cells.

Main Results:

  • CD40 crosslinking induced sustained proliferation of resting B lymphocytes.
  • IL-4 promoted the generation of long-term B cell lines and IgE secretion via isotype switching.
  • IL-10 enhanced immunoglobulin production by differentiating B cells into plasma cells.
  • IL-10 and TGF-beta combined induced naive B cells to secrete IgA1 and IgA2 through isotype switching.
  • The extracellular domain of CD40 binds specifically to a T cell-expressed glycoprotein, signifying a key step in T cell-dependent B cell activation.

Conclusions:

  • CD40 signaling is a pivotal pathway for B cell activation, proliferation, and differentiation.
  • Cytokines IL-4, IL-10, and TGF-beta differentially modulate CD40-induced B cell responses, influencing immunoglobulin class switching and secretion.
  • The interaction between CD40 on B cells and its ligand on T cells is essential for T cell-dependent B cell activation and subsequent antibody production.

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