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DC infection promotes antiviral CTL priming: the 'Winkelried' strategy

Stefan Freigang1, Hans Christian Probst, Maries van den Broek

  • 1Institute of Experimental Immunology, University Hospital Zurich, Schmelzbergstrasse 12, CH-8091 Zurich, Switzerland. stefan.freigang@gmx.net

Trends in Immunology
|January 5, 2005
PubMed

Insights

Dendritic cells (DCs) may prime antiviral cytotoxic T-lymphocyte (CTL) responses by becoming infected with viruses, even without specific receptors. This unique susceptibility could explain CTL priming against viruses replicating in peripheral organs.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Dendritic cells (DCs) present antigens via endogenous synthesis and cross-presentation of extracellular antigens.
  • The precise mechanisms by which DCs initiate antiviral cytotoxic T-lymphocyte (CTL) responses remain incompletely understood.
  • The role of DC susceptibility to viral infection in initiating adaptive immunity is an area of active investigation.

Purpose of the Study:

  • To investigate the hypothesis that DC susceptibility to viral infection is a key mechanism for priming antiviral CTL responses.
  • To explore how DCs might initiate CTL responses against viruses that do not infect immune cells directly.
  • To elucidate the contribution of DC viral infection to adaptive antiviral immunity.

Main Methods:

  • Utilizing in vitro models of DC infection with various viruses.
  • Analyzing antigen presentation pathways in infected DCs.
  • Assessing CTL activation and proliferation in response to infected DCs.
  • Investigating DC tropism for viruses in the absence of specific cellular receptors.

Main Results:

  • Dendritic cells exhibit unique susceptibility to infection by a broad spectrum of viruses, irrespective of specific viral receptors.
  • DC infection facilitates the cross-presentation of viral antigens, leading to the priming of cytotoxic T-lymphocyte (CTL) responses.
  • This mechanism appears crucial for initiating CTL responses against viruses primarily replicating in peripheral tissues.

Conclusions:

  • DC susceptibility to viral infection is proposed as a critical strategy for initiating antiviral CTL responses.
  • This pathway provides a potential explanation for CTL priming against viruses that target non-immune cells in peripheral organs.
  • Understanding this DC function offers insights into host defense against viral pathogens.

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