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Single-cell quantification of IL-2 response by effector and regulatory T cells reveals critical plasticity in immune

Ofer Feinerman1, Garrit Jentsch, Karen E Tkach

  • 1ImmunoDynamics Group, Programs in Computational Biology and Immunology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.

Molecular Systems Biology
|December 2, 2010
PubMed

Insights

Immune cells, like regulatory T cells (Treg) and effector T cells (Teff), compete for interleukin-2 (IL-2). This competition dictates T cell survival and immune response regulation.

Area of Science:

  • Immunology
  • Systems Biology
  • Computational Biology

Background:

  • Cytokine regulation is crucial for immune system balance, determining T cell tolerance or activation.
  • Interleukin-2 (IL-2) signaling dynamics are key to understanding immune responses.
  • T cell heterogeneity impacts population-level immune functions.

Purpose of the Study:

  • To quantify the dynamics of IL-2 signaling in T cell populations.
  • To investigate the role of T cell heterogeneity in IL-2 signaling.
  • To elucidate the mechanism of T regulatory (Treg) cell suppression in immune responses.

Main Methods:

  • Combined in silico modeling with in vitro single-cell measurements.
  • Quantified IL-2 receptor expression levels across individual T cells.
  • Analyzed IL-2 consumption, production, and signaling participation.

Main Results:

  • Significant variability in IL-2 receptor expression among T cells was observed.
  • A population-level 'tug-of-war' for IL-2 between Treg and T effector (Teff) cells was identified.
  • IL-2 access differentially impacts Teff cell survival and Treg cell suppressive capacity.
  • This competition mechanism enforces Treg-mediated suppression of weakly activated Teff cells.

Conclusions:

  • T cell heterogeneity in IL-2 signaling is a critical determinant of immune response outcomes.
  • The IL-2 tug-of-war mechanism explains Treg cell's specific suppression of Teff cells.
  • The integrated model provides testable predictions for manipulating Treg-mediated immune suppression.

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