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Polarization of naive CD4+ T cells toward the Th1 subset by CTLA-4 costimulation

T Kato1, H Nariuchi

  • 1Department of Allergology, Institute of Medical Science, University of Tokyo, Tokyo, Japan. kato-tak@ims.u-tokyo.ac.jp

Journal of Immunology (Baltimore, Md. : 1950)
|March 22, 2000
PubMed

Insights

Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) costimulation drives naive CD4+ T cells toward the Th1 subset. Blocking CTLA-4 signaling promotes Th2 polarization, while CTLA-4 engagement enhances Th1 differentiation via TGF-beta1.

Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Naive CD4+ T cells differentiate into distinct subsets, including Th1 and Th2, which orchestrate different immune responses.
  • Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) is a key regulator of T cell activation and immune tolerance.
  • Understanding the role of CTLA-4 in T cell polarization is crucial for developing targeted immunotherapies.

Purpose of the Study:

  • To investigate the in vitro role of CTLA-4 costimulation in the polarization of naive CD4+ T cells towards the Th1 subset.
  • To elucidate the mechanisms by which CTLA-4 influences T cell differentiation.

Main Methods:

  • In vitro culture of naive CD4+ T cells with anti-CD3 and splenic adherent cells.
  • Modulation of CTLA-4 signaling using anti-CTLA-4 Fab or engagement with immobilized ligands.
  • Assessment of T cell polarization via cytokine production and mRNA accumulation.
  • Intervention with anti-TGF-beta antibodies and exogenous TGF-beta1.

Main Results:

  • Blocking CTLA-4 signaling with anti-CTLA-4 Fab promoted Th2 polarization.
  • Engagement of CTLA-4 with its ligands induced Th1 polarization.
  • CTLA-4 costimulation augmented TGF-beta1 mRNA accumulation, which was critical for Th1 polarization.
  • Low doses of TGF-beta1 enhanced Th1 cytokine production without affecting Th2 cytokines.
  • CTLA-4 costimulation suppressed IL-4 production, hindering Th2 differentiation.

Conclusions:

  • CTLA-4 costimulation drives naive CD4+ T cell polarization towards the Th1 subset, partly through enhanced TGF-beta1 production.
  • This process is independent of IL-12.
  • CTLA-4 signaling also suppresses Th2 subset differentiation by affecting IL-4 production.

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