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Differential effects of CD28 costimulation upon cytokine production by CD4+ and CD8+ T cells

Rosemary Rochford1, James E Riggs, Anaira Clavo

  • 1Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse University, Syracuse, NY 13210, USA.

Immunobiology
|December 1, 2004
PubMed

Insights

CD28 costimulation boosts T cell proliferation and cytokine release, particularly in CD4+ T cells. Naive CD4+ T cells show the strongest response, indicating distinct CD28-driven differentiation pathways.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD28 is a crucial costimulatory receptor on T lymphocytes.
  • Understanding CD28's role in T cell activation is vital for immunotherapy.

Purpose of the Study:

  • To investigate the impact of CD28 ligation on CD4+ and CD8+ T cell proliferation and cytokine production.
  • To differentiate the CD28 response between naive and memory/effector T cell subsets.

Main Methods:

  • Assessment of T lymphocyte proliferation and cytokine production following CD28 ligation.
  • Subdivision of CD4+ and CD8+ T cells into CD44lo (naïve) and CD44hi (memory/effector) populations.

Main Results:

  • CD28 costimulation enhanced proliferation in both CD4+ and CD8+ T cells.
  • Cytokine production, including IL-2, IL-3, IFN-γ, and GM-CSF, increased significantly, especially in CD4+ T cells.
  • Naive CD4+ T cells exhibited the highest responsiveness to CD28 ligation.

Conclusions:

  • CD28 costimulation differentially impacts CD4+ and CD8+ T cell responses.
  • Distinct differentiation programs are initiated by CD28-mediated costimulation in CD4+ versus CD8+ T cells.

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