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Related Experiment Videos

Extracellular antigen processing and presentation by immature dendritic cells.

L Santambrogio1, A K Sato, G J Carven

  • 1Department of Cancer Immunology/AIDS, Dana Farber Cancer Institute, Boston, MA 02115, USA. Laura_Santambrogio@dfci.harvard.edu

Proceedings of the National Academy of Sciences of the United States of America
|December 28, 1999
PubMed
Summary

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Immune cells called immature dendritic cells (DCs) can present antigens extracellularly. This involves processing proteins into peptides outside the cell for loading onto cell surface MHC class II molecules.

Area of Science:

  • Immunology
  • Cell Biology
  • Protein Chemistry

Background:

  • Antigen presentation to CD4(+) T cells involves peptide loading onto MHC class II molecules.
  • This typically occurs within intracellular compartments of antigen-presenting cells.
  • Peptide exchange factors, H-2M (murine) or HLA-DM (human), are crucial for this process.

Purpose of the Study:

  • To investigate an alternative antigen processing and presentation pathway in immature dendritic cells (DCs).
  • To determine if antigen processing and peptide loading can occur extracellularly.

Main Methods:

  • Analysis of immature dendritic cell surface expression of MHC class II molecules and H-2M/HLA-DM.
  • Investigation of extracellular protease activity in processing intact proteins into peptides.

Related Experiment Videos

  • Assessment of peptide loading onto cell surface MHC class II molecules.

    • Main Results:

    • Immature DCs express peptide-receptive MHC class II and H-2M/HLA-DM on their surface.
    • Secreted dendritic cell proteases process intact proteins into antigenic peptides extracellularly.
    • These extracellularly generated peptides are efficiently loaded onto cell surface MHC class II molecules.

    Conclusions:

    • A novel extracellular antigen processing and presentation pathway exists in immature DCs.
    • This pathway allows antigen processing and peptide loading to occur entirely outside the cell.
    • This finding expands our understanding of immune surveillance mechanisms.