Abstract
Autophagy delivers cytoplasmic constituents for lysosomal degradation. Recent studies have demonstrated that this pathway mediates resistance to pathogens and is targeted for immune evasion by viruses and bacteria. Lysosomal degradation products, including pathogenic determinants, are then surveyed by the adaptive immune system to elicit antigen-specific T cell responses. CD4+ T helper cells have been shown to recognize nuclear and cytosolic antigens via presentation by major histocompatibility complex (MHC) class II molecules after autophagy. Furthermore, some sources of natural MHC class II ligands display characteristics of autophagy substrates, and autophagosomes fuse with late endosomes, in which MHC class II loading is thought to occur. Although MHC class II antigen processing via autophagy has so far mainly been described for professional antigen-presenting cells like B cells, macrophages, and dendritic cells, it might be even more important for cells with less endocytic potential, like epithelial cells, when these express MHC class II at sites of inflammation. Therefore, autophagy might contribute to immune surveillance of intracellular pathogens via MHC class II presentation of intracellular pathogen-derived peptides.
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Abbreviations
- APC:
-
Antigen-presenting cell
- Atg:
-
Autophagy-related gene
- CLIP:
-
Class II-associated Ii-derived peptide
- CTL:
-
Cytotoxic T lymphocyte
- DRiP:
-
Defective ribosomal product
- EBNA1:
-
Epstein–Barr virus nuclear antigen 1
- EBV:
-
Epstein–Barr virus
- Hsc70:
-
Heat shock cognate protein 70/73
- HLA:
-
Human leukocyte antigen
- Ii:
-
Invariant chain
- LAMP:
-
Lysosomal-associated membrane protein
- MHC:
-
Major histocompatibility complex
- MIIC:
-
MHC class II-containing compartment
- Mtb:
-
Mycobacterium tuberculosis
- Th:
-
T helper cell
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Acknowledgements
We thank the National Cancer Institute (R01CA108609), the Arnold and Mabel Beckman Foundation, and the Alexandrine and Alexander Sinsheimer Foundation for supporting our research (to C.M.). D.S. is a recipient of a predoctoral fellowship from the Schering Foundation.
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Schmid, D., Dengjel, J., Schoor, O. et al. Autophagy in innate and adaptive immunity against intracellular pathogens. J Mol Med 84, 194–202 (2006). https://doi.org/10.1007/s00109-005-0014-4
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DOI: https://doi.org/10.1007/s00109-005-0014-4