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CD2-CD48 interactions promote interleukin-2 and interferon-gamma synthesis by stabilizing cytokine mRNA

Bruce L Musgrave1, Carrie L Watson, S M Mansour Haeryfar

  • 1Department of Microbiology and Immunology, Dalhousie University, Halifax, NS B3H 1X5, Canada.

Cellular Immunology
|August 28, 2004
PubMed

Insights

CD2-CD48 interactions boost T lymphocyte activation by stabilizing cytokine mRNA. While CD2 costimulation enhances T cell responses, CD28 signaling demonstrates a more potent effect on cytokine mRNA stability and T cell proliferation.

Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • CD2-CD48 interactions are known to enhance T cell receptor-driven T lymphocyte activation.
  • The precise mechanisms underlying CD2-mediated costimulation remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of CD2-CD48 interactions in T lymphocyte activation.
  • To compare the costimulatory effects of CD2 and CD28 pathways on T cell responses.

Main Methods:

  • Utilized anti-CD48 monoclonal antibody (mAb) to block CD2-CD48 interactions.
  • Assessed T cell proliferation and cytokine (IL-2, IFN-gamma) expression following stimulation with anti-CD3 mAb.
  • Investigated the impact of blocking CD2 and CD28 costimulatory pathways.
  • Examined mRNA stability of IL-2 and IFN-gamma upon stimulation with immobilized anti-CD3 and anti-CD2 or anti-CD3 and anti-CD28 mAb.

Main Results:

  • Blockade of CD2-CD48 interactions inhibited IL-2 and IFN-gamma expression and T cell proliferation.
  • Blocking both CD2 and CD28 costimulation abrogated T cell activation.
  • Stimulation with anti-CD3 and anti-CD2 mAb increased proliferation and cytokine expression, with CD28 providing a stronger enhancement.
  • CD2 costimulation stabilized IL-2 and IFN-gamma mRNA, but CD28 exhibited a more pronounced effect.

Conclusions:

  • CD2 costimulates T cell activation, partly by enhancing the stability of cytokine mRNA transcripts.
  • CD28 costimulation is more potent than CD2 in stabilizing cytokine mRNA and promoting T cell activation.
  • Combined CD2 and CD28 signaling leads to additive increases in T cell proliferation and cytokine synthesis.

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