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Related Experiment Videos

Interleukin-2 down-modulates memory T helper lymphocyte development during antigenic stimulation in vitro

V Bemer1, I Motta, R Perret

  • 1Unité d'Immunophysiologie Moléculaire, Institut Pasteur, Paris, France.

European Journal of Immunology
|December 1, 1995
PubMed
Summary

Interleukin-2 (IL-2) is crucial for T helper cell memory development. Studies show that priming T cells without IL-2 enhances their helper function and promotes memory cell differentiation.

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Area of Science:

  • Immunology
  • Cellular and Molecular Immunology

Background:

  • Previous research indicated cyclosporin A (CSA) favors T lymphocyte differentiation into memory cells.
  • CSA inhibits interleukin-2 (IL-2) gene expression, prompting an investigation into IL-2's role in memory T helper cell development.

Purpose of the Study:

  • To analyze the effect of IL-2 on memory T helper cell development.
  • To investigate the role of IL-2 in T cell differentiation and helper function.

Main Methods:

  • Murine splenic cells were primed with sheep red blood cells (SRBC) with or without IL-2, or with anti-IL-2 receptor antibodies.
  • Helper function was assessed by the capacity of T cells to help virgin B splenocytes produce anti-SRBC antibodies.
  • Phenotypic analysis of T cells included markers like MEL-14 and CD44.

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  • Cytokine gene expression (IL-2, IL-4, IL-5, interferon-gamma) was analyzed after secondary antigenic stimulation.

    • Main Results:

    • CD4+ T cells primed in the absence of IL-2 exhibited superior helper functions.
    • These IL-2-deficient primed cells displayed a memory phenotype (low MEL-14, high CD44 expression).
    • Memory T helper cells were shown to originate partly from naive T cells with a MEL-14hi phenotype.
    • Helper function correlated with up-regulation of IL-2 and IL-5 genes upon secondary stimulation.

    Conclusions:

    • IL-2 plays a significant role in controlling the induction of memory T helper cells.
    • Priming T cells in an IL-2-deficient environment enhances their memory development and helper capacity.
    • The findings challenge the conventional view of IL-2's necessity for T cell memory formation.