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Cross-presentation of viral and self antigens by skin-derived CD103+ dendritic cells

Sammy Bedoui1, Paul G Whitney, Jason Waithman

  • 1The Department of Microbiology and Immunology, The University of Melbourne, Parkville, Victoria, Australia.

Nature Immunology
|April 8, 2009
PubMed

Insights

Skin dendritic cells (DCs) show specialization. The CD103(+) subset uniquely presents viral antigens to CD8(+) T cells, highlighting its crucial role in immune responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Dermatology

Background:

  • Skin dendritic cells (DCs) are crucial for initiating immune responses.
  • Distinct DC subsets, including Langerhans cells and dermal DCs, reside in the skin.
  • A specific langerin-positive CD103(+) dermal DC subset has been identified.

Purpose of the Study:

  • To investigate the antigen-presenting capabilities of different skin-derived DC subsets.
  • To determine the role of CD103(+) DCs in presenting viral and self-antigens.
  • To elucidate the specialization of skin DC subsets in antigen processing and presentation.

Main Methods:

  • Isolation and characterization of distinct skin-derived DC subsets.
  • Antigen presentation assays using herpes simplex virus type 1 (HSV-1) and skin-derived self-antigens.
  • Analysis of T cell activation, specifically CD8(+) and CD4(+) T cell responses.
  • Assessment of antigen processing through the major histocompatibility complex (MHC) class I pathway, including cross-presentation.

Main Results:

  • All skin DC subsets presented viral antigens to CD4(+) T cells.
  • Only the CD103(+) dermal DC subset efficiently presented viral antigens to naive CD8(+) T cells.
  • CD103(+) DCs demonstrated superior cross-presentation of both viral and skin-derived self-antigens.
  • This suggests CD103(+) DCs are specialized for processing antigens via the MHC class I pathway.

Conclusions:

  • CD103(+) dermal DCs are the primary migratory subtype responsible for cross-presenting viral and self-antigens in the skin.
  • This finding reveals a higher level of functional specialization among skin DC populations.
  • The unique antigen-presenting capacity of CD103(+) DCs has significant implications for understanding skin immunity and developing targeted therapies.

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