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Recombinant interferon-alpha selectively inhibits the production of interleukin-5 by human CD4+ T cells

L Schandené1, G F Del Prete, E Cogan

  • 1Department of Immunology, Hôpital Erasme-Cliniques Universitaires de Bruxelles, Belgium.

The Journal of Clinical Investigation
|January 15, 1996
PubMed

Insights

Recombinant interferon-alpha (IFN-alpha) selectively inhibits interleukin-5 (IL-5) production in human CD4+ T cells. This finding was consistent across resting cells, differentiated Th2 cells, and Th2/Th0 clones, suggesting a key regulatory role.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Interferon-alpha (IFN-alpha) is a cytokine with diverse immune regulatory functions.
  • Interleukin-5 (IL-5) is a critical cytokine for eosinophil development and activation, implicated in allergic diseases.

Purpose of the Study:

  • To investigate the effect of recombinant IFN-alpha on IL-5 production by human CD4+ T cells.
  • To determine if IFN-alpha's effect varies across different T cell activation states and subtypes.

Main Methods:

  • Human peripheral blood mononuclear cells (PBMCs) were isolated and stimulated to activate CD4+ T cells.
  • Recombinant IFN-alpha was added to cell cultures, and cytokine production (IL-5, IL-4, IL-10) was measured.
  • Differentiated Th2 cells from hypereosinophilic syndrome patients and in vitro generated Th2/Th0 clones were also analyzed.

Main Results:

  • IFN-alpha significantly inhibited IL-5 production in a dose-dependent manner in resting CD4+ T cells.
  • IFN-alpha also markedly inhibited IL-5 production in differentiated Th2 cells and Th2/Th0 clones.
  • While IL-5 was downregulated, IL-10 was upregulated in resting cells, and mild upregulation of IL-4 and IL-10 was observed in some Th2 cells.

Conclusions:

  • IFN-alpha selectively downregulates IL-5 synthesis in human CD4+ T cells.
  • This inhibitory effect is consistent across various T cell populations, including those relevant to allergic inflammation.

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