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Related Experiment Videos

Alternative processing for MHC class I presentation by immature and CpG-activated dendritic cells.

Liying Chen1, Mikael Jondal

  • 1Microbiology and Tumor Biology Center, Karolinska Institute, Stockholm, Sweden.

European Journal of Immunology
|March 30, 2004
PubMed
Summary

Immature dendritic cells (iDC) process external proteins via a novel pathway independent of the proteasome and Golgi. This mechanism, involving regurgitation and extracellular enzyme secretion, contributes to MHC class I antigen presentation.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Exogenous proteins are processed by antigen-presenting cells for MHC class I-restricted T cell responses.
  • The precise location and mechanisms of exogenous antigen processing for MHC class I presentation remain unclear.
  • Both cytosolic transfer and alternative endolysosomal/phagosomal pathways have been proposed.

Purpose of the Study:

  • To investigate the capacity of mouse myeloid dendritic cells (DCs) to process exogenous ovalbumin (OVA) for presentation by H2-K(b).
  • To characterize the pathways involved in exogenous antigen processing by DCs at different maturation stages.

Main Methods:

  • Utilized bone marrow-derived mouse myeloid dendritic cells (DCs), including wild-type and transporter associated with antigen processing (TAP)-deficient variants.

Related Experiment Videos

  • Assessed OVA processing in immature DCs (iDC), intermediate mature DCs (imDC), and IL-3 expanded macrophages.
  • Employed inhibitors of the classical MHC class I pathway, such as Brefeldin A (BFA) and lactacystin, to probe processing mechanisms.
  • Investigated the role of CpG oligonucleotide activation in imDC antigen processing.
  • Analyzed OVA processing via regurgitation and extracellular enzymatic activity.

    • Main Results:

    • Immature DCs (iDC), irrespective of TAP expression, transiently process OVA via a BFA- and lactacystin-resistant pathway.
    • This alternative processing is absent in intermediate mature DCs (imDC) and resting macrophages but can be restored in imDC upon CpG activation.
    • Both iDC and CpG-activated DCs process OVA through regurgitation.
    • Immature DCs secrete extracellular proteolytic enzymes capable of processing OVA.

    Conclusions:

    • Multiple pathways exist for processing exogenous protein antigens into peptides suitable for MHC class I presentation.
    • Immature DCs utilize a unique, non-classical pathway for exogenous antigen processing, involving regurgitation and extracellular enzymes.
    • DC maturation state and activation influence the employed antigen processing pathways.