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Related Experiment Videos

Interleukin-2: a possible trigger for autoimmunity.

J A Gonzalo1, E Cuende, J E Alés-Martínez

  • 1Centro de Biología Molecular (CSIC), Universidad Autónoma de Madrid, España.

International Archives of Allergy and Immunology
|January 1, 1992
PubMed
Summary
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Interleukin-2 (IL-2) can trigger autoimmune diseases by preventing T-cell inactivation, not by affecting T-cell deletion. This suggests autoimmunity risk depends on pre-existing self-reactive T cells.

Area of Science:

  • Immunology
  • Autoimmunity
  • Cancer Therapy

Background:

  • High-dose recombinant interleukin-2 (IL-2) in cancer therapy can cause transient, organ-specific autoimmune lesions, primarily affecting the thyroid.
  • Elevated IL-2 levels are observed during active phases of autoimmune diseases like multiple sclerosis and systemic lupus erythematosus.
  • Immunological self-tolerance is maintained by mechanisms including clonal deletion and clonal anergy.

Purpose of the Study:

  • To investigate whether IL-2 interferes with clonal deletion or clonal anergy in vivo.
  • To determine the role of IL-2 in the pathogenesis of autoimmune diseases.
  • To understand the mechanisms of immunological self-tolerance.

Main Methods:

  • Experimental systems were used to test IL-2's effect on T-cell and B-cell clonal deletion in murine thymus, peripheral T-cell compartment, and bone marrow.

Related Experiment Videos

  • The impact of IL-2 on abrogating clonal anergy of non-deleted self-specific T cells was assessed.
  • Induction of autoimmune lesions by IL-2 in the presence of varying frequencies of self-reactive T cells was studied.

    • Main Results:

    • IL-2 did not abolish clonal deletion of self-reactive T cells in the thymus or periphery.
    • IL-2 did not affect clonal deletion of self-reactive B cells in the bone marrow.
    • IL-2 abrogated clonal anergy of non-deleted self-specific T cells, inducing autoimmune lesions only when high frequencies of these cells were present.

    Conclusions:

    • IL-2 interferes with the mechanism of self-tolerance that inactivates T cells that have escaped clonal deletion.
    • Autoimmune lesions induced by IL-2 require the presence of a non-deleted, anergic, potentially autoreactive T-cell population.
    • These findings suggest that in humans, the risk of IL-2-induced organ-specific disease depends on the pre-existence of such T-cell populations.