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Polyinosinic-polycytidylic acid-mediated stimulation of human gammadelta T cells via CD11c dendritic cell-derived

Volker Kunzmann1, Eva Kretzschmar, Thomas Herrmann

  • 1Medizinische Poliklinik, University of Würzburg, Würzburg, Germany. kunzmann_v@klinik.uni-wuerzburg.de

Immunology
|June 16, 2004
PubMed

Insights

Polyinosinic-polycytidylic acid (poly(I:C)), a mimic of viral double-stranded RNA, activates gammadelta T cells indirectly. This activation relies on type I interferons produced by dendritic cells expressing Toll-like receptor 3.

Area of Science:

  • Immunology
  • Innate Immunity
  • T-cell Biology

Background:

  • Pathogen-associated molecular patterns (PAMPs) are crucial for innate immune responses.
  • Double-stranded RNA (dsRNA), mimicked by polyinosinic-polycytidylic acid (poly(I:C)), is a key viral PAMP.
  • gammadelta T cells play a role in immune surveillance and early responses.

Purpose of the Study:

  • To investigate the costimulatory capacity of poly(I:C) on gammadelta T cells.
  • To elucidate the mechanism of poly(I:C)-mediated gammadelta T cell activation.
  • To determine the role of dendritic cells and cytokines in this process.

Main Methods:

  • Stimulation of peripheral blood mononuclear cells with poly(I:C).
  • Analysis of gammadelta T cell activation markers (CD69) and proliferation.
  • Depletion of CD11c(+) dendritic cells and use of neutralizing antibodies.
  • Assessment of cytokine involvement (Type I IFNs, IL-15).

Main Results:

  • Poly(I:C) demonstrated potent costimulatory capacity for gammadelta T cells.
  • Poly(I:C) induced CD69 expression and enhanced proliferation of gammadelta T cells.
  • Activation was indirect, mediated by CD11c(+) dendritic cells expressing TLR3.
  • Type I interferons, but not IL-15, were identified as key mediators.

Conclusions:

  • Poly(I:C)-induced gammadelta T cell activation is indirectly mediated by type I IFNs from TLR3+ dendritic cells.
  • This pathway highlights a rapid mechanism for gammadelta T cell activation during viral infections.
  • gammadelta T cells may contribute significantly to early antiviral immunity.

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