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The role of CTLA-4 in regulating Th2 differentiation

M A Oosterwegel1, D A Mandelbrot, S D Boyd

  • 1Immunology Research Division, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|August 24, 1999
PubMed

Insights

Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) deficiency promotes T helper 2 (Th2) cell differentiation. CTLA-4 acts as a potent inhibitor of Th2 differentiation, while CD28 promotes it.

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • T helper (Th) cell differentiation is crucial for adaptive immunity.
  • The B7-CD28/CTLA-4 pathway is a key regulator of T cell responses.
  • The precise role of CTLA-4 in Th cell differentiation requires further elucidation.

Purpose of the Study:

  • To investigate the role of CTLA-4 in regulating Th cell differentiation.
  • To determine how the B7-CD28/CTLA-4 pathway influences Th2 differentiation.

Main Methods:

  • Generation of CTLA-4-deficient (CTLA-4-/-) mouse strains.
  • In vitro priming and restimulation of naive CD4+ T cells.
  • Analysis of cytokine production (IL-4, IFN-gamma) and T cell proliferation.
  • In vivo administration of anti-CD28 antibody.

Main Results:

  • CTLA-4-/- T cells differentiated into Th2 cells, while wild-type T cells differentiated into Th1 cells.
  • CTLA-4 deficiency led to increased IL-4 production, indicating a Th2 bias.
  • CTLA-4 deficiency had a modest effect on T cell proliferation.
  • Anti-CD28 antibody induced IL-4 production in CTLA-4-/- mice.

Conclusions:

  • CTLA-4 is a critical inhibitor of Th2 cell differentiation.
  • The B7-CD28/CTLA-4 pathway regulates Th2 differentiation through opposing actions of CD28 and CTLA-4.
  • CD28 promotes Th2 differentiation, while CTLA-4 limits it.

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