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Two distinct non-T helper type 2 interleukin-4+ cell subsets in mice as revealed by single-cell cytokine analysis

I Kariv1, R R Hardy, K Hayakawa

  • 1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111.

European Journal of Immunology
|March 1, 1994
PubMed

Insights

Researchers identified four murine CD4+ T cell subsets with distinct cytokine profiles. Most IL-4+ cells co-produce IFN-gamma, challenging the typical T helper type 2 cell definition.

Area of Science:

  • Immunology
  • T cell subsets
  • Cytokine production

Background:

  • Four murine CD4+ peripheral T cell subsets (Fr. I-IV) were previously defined by 6C10 and 3G11 determinants.
  • Subsets Fr. III and Fr. IV exhibit secondary T cell markers (CD45RBlow/-, L-selectin-, CD44hi).

Purpose of the Study:

  • To correlate phenotypically defined murine CD4+ T cell subsets with distinct cytokine production patterns.
  • To characterize the cytokine profiles of T cell subsets, particularly IL-4 producing cells.

Main Methods:

  • Phenotypic analysis of T cell subsets using cell surface markers (6C10, 3G11, CD45RB, L-selectin, CD44).
  • Bioassay for cytokine production (IL-2, IL-4, IFN-gamma) by individual cells after anti-CD3 stimulation.

Main Results:

  • Phenotypically defined subsets largely corresponded to distinct cytokine profiles: IL-2+/IFN-gamma-/IL-4- (Fr. I/II), IL-2+/IFN-gamma+/IL-4+ (Fr. III), and IL-2-/IFN-gamma low/-/IL-4+ (Fr. IV).
  • An L-selectin-negative subfraction within Fr. II showed transitional cytokine production.
  • The majority of IL-4+ cells co-produced IFN-gamma, indicating they are not typical T helper type 2 cells.

Conclusions:

  • Two IL-4+ secondary T cell subsets with distinct cytokine profiles exist.
  • Most IL-4+ cells in healthy mice co-produce IFN-gamma, suggesting a broader functional definition beyond classical T helper type 2 cells.

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