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Endogenous pathway of class II presentation

G Aichinger1, R I Lechler

  • 1Department of Immunology, RPMS, Hammersmith Hospital, London, U.K.

Biochemical Society Transactions
|August 1, 1995
PubMed
Summary
This summary is machine-generated.

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MHC class II molecules primarily bind peptides in endosomes, but can present endogenous antigens. This pathway is crucial for CD4+ T-cell responses in viral infections, tumors, and potentially autoimmune diseases.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • MHC class II molecule assembly, targeting, and peptide loading are tightly regulated.
  • Mechanisms typically prevent peptide binding in the ER and secretory compartments.
  • Peptide loading predominantly occurs in the endosomal/lysosomal compartment.

Purpose of the Study:

  • To investigate the mechanisms controlling MHC class II peptide loading.
  • To explore the presentation of endogenous antigens by MHC class II molecules.
  • To understand the implications of MHC class II endogenous antigen presentation in disease.

Main Methods:

  • The study discusses existing knowledge on MHC class II assembly and peptide loading pathways.
  • It reviews mechanisms of antigen selection and presentation.

Related Experiment Videos

  • The focus is on theoretical and mechanistic insights rather than experimental procedures.

    • Main Results:

    • MHC class II molecules primarily bind peptides in endosomes/lysosomes.
    • The barrier between exogenous and endogenous antigen presentation is less strict for MHC class II compared to MHC class I.
    • Several mechanisms can lead to MHC class II presentation of endogenous antigens.

    Conclusions:

    • Endogenous antigen presentation by MHC class II, though limited, is significant in viral infections and tumors for recruiting CD4+ helper T-cells.
    • Accumulation of unfolded/misfolded proteins in the ER can compete for MHC class II binding.
    • The role of this pathway in autoimmune reactions requires further investigation.