CD40 ligand-positive CD8+ T cell clones allow B cell growth and differentiation

Eur J Immunol. 1995 Oct;25(10):2972-7. doi: 10.1002/eji.1830251039.


A fraction of activated CD8+ T cells expresses CD40 ligand (CD40L), a molecule that plays a key role in T cell-dependent B cell stimulation. CD8+ T cell clones were examined for CD40L expression and for their capacity to allow the growth and differentiation of B cells, upon activation with immobilized anti-CD3. According to CD40L expression, CD8+ clones could be grouped into three subsets. CD8+ T cell clones expressing high levels of CD40L (> or = 80% CD40L+ cells) were equivalent to CD4+ T cell clones with regard to induction of tonsil B cell proliferation and immunoglobulin (Ig) production, provided the combination of interleukin (IL)-2 and IL-10 was added to cultures. CD8+ T cell clones, with intermediate levels of CD40L expression (10 to 30% CD40L+ cells), also stimulated B cell proliferation and Ig secretion with IL-2 and IL-10. B cell responses induced by these CD8+ T cell clones were neutralized by blocking monoclonal antibodies specific for either CD40L or CD40. By contrast, CD40L- T cell clones (< or = 5% CD40L+ cells), only induced marginal B cell responses even with IL-2 and IL-10. All three clone types were able to activate B cells as shown by up-regulation of CD25, CD80 and CD86 expression. A neutralizing anti-CD40L antibody indicated that T cell-dependent B cell activation was only partly dependent on CD40-CD40L interaction. These CD40L- clones had no inhibitory effects on B cell proliferation induced by CD40L-expressing CD8+ T cell clones. Taken together, these results indicate that CD8+ T cells can induce B cell growth and differentiation in a CD40L-CD40-dependent fashion.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibody Formation
  • B-Lymphocytes / cytology*
  • B-Lymphocytes / immunology
  • B7-1 Antigen / biosynthesis
  • CD40 Ligand
  • CD8-Positive T-Lymphocytes / immunology*
  • CD8-Positive T-Lymphocytes / metabolism
  • Cell Differentiation
  • Cell Division
  • Cells, Cultured
  • Clone Cells / immunology
  • Dipeptidyl Peptidase 4 / biosynthesis
  • Flow Cytometry
  • Humans
  • Interleukin-10 / pharmacology
  • Interleukin-2 / metabolism
  • Interleukin-2 / pharmacology
  • L Cells
  • Lymphocyte Activation
  • Lymphocyte Cooperation*
  • Membrane Glycoproteins / genetics
  • Membrane Glycoproteins / physiology*
  • Mice
  • Mitogens / pharmacology
  • Palatine Tonsil / cytology
  • Phytohemagglutinins / pharmacology
  • Receptors, Interleukin-2 / biosynthesis
  • T-Lymphocyte Subsets / immunology*
  • T-Lymphocyte Subsets / metabolism
  • Transfection
  • Up-Regulation / drug effects


  • B7-1 Antigen
  • Interleukin-2
  • Membrane Glycoproteins
  • Mitogens
  • Phytohemagglutinins
  • Receptors, Interleukin-2
  • Interleukin-10
  • CD40 Ligand
  • Dipeptidyl Peptidase 4