Normal clonal expansion but impaired Fas-mediated cell death and anergy induction in interleukin-2-deficient mice

Eur J Immunol. 1995 Sep;25(9):2572-7. doi: 10.1002/eji.1830250925.

Abstract

Despite a normal development of all major lymphoid subsets, with time, interleukin-2 (IL-2)-deficient mice develop a fatal immunopathology. The disease phenotype is characterized by lymphoadenopathy, splenomegaly, T cell infiltration of various organs, overproduction of a number of cytokines and autoantibody formation. Phenotypically, CD4+ and CD8+ T cells exhibit features characteristic of antigenically experienced cells. The accumulation of cells with a memory phenotype together with the previous suggestion of an involvement of IL-2 in the termination phase of immune responses prompted us to study the fate of superantigen-reactive T cells in IL-2-deficient mice in comparison to their IL-2-producing littermates. We show that expansion in vivo of CD4+ and, to a lesser extent, CD8+ T cells reactive to the superantigens staphylococcal enterotoxin A and B (SEA and SEB) proceeds normally in the absence of IL-2, but that fewer CD4+ cells are subsequently deleted. The residual superantigen-reactive cells fail to become anergic as measured by proliferation in vitro in response to the same superantigen. T cell blasts generated in vitro from lymph node cells of IL-2-deficient mice by superantigen stimulation in the absence of exogenous IL-2 also fail to become anergic. In contrast to cells from IL-2-producing littermates, they do not exhibit Fas-induced apoptosis when cultured on anti-Fas antibody-coated plates, although Fas expression by IL-2-deficient cells is normal or even elevated compared to the IL-2-producing control cells. The data suggest that activation of T cells in the absence of IL-2 fails to generate a signal which is necessary to activate the apoptotic pathway and thus leads to an accumulation of antigen-experienced cells and the chronic inflammatory responses observed in IL-2-deficient mice.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis / immunology
  • CD4-Positive T-Lymphocytes / immunology*
  • CD8-Positive T-Lymphocytes / immunology*
  • Cell Differentiation
  • Enterotoxins / immunology
  • Interleukin-2 / deficiency*
  • Mice
  • Superantigens / immunology
  • fas Receptor / immunology*

Substances

  • Enterotoxins
  • Interleukin-2
  • Superantigens
  • fas Receptor