Dectin-1-triggered Recruitment of Light Chain 3 Protein to Phagosomes Facilitates Major Histocompatibility Complex Class II Presentation of Fungal-derived Antigens
Dectin-1-triggered Recruitment of Light Chain 3 Protein to Phagosomes Facilitates Major Histocompatibility Complex Class II Presentation of Fungal-derived Antigens
Dectin-1 is a pattern recognition receptor that is important for innate immune responses against fungi in humans and mice. Dectin-1 binds to β-glucans in fungal cell walls and triggers phagocytosis, production of reactive oxygen by the NADPH oxidase, and inflammatory cytokine production which all contribute to host immune responses against fungi. Although the autophagy pathway was originally characterized for its role in the formation of double-membrane compartments engulfing cytosolic organelles and debris, recent studies have suggested that components of the autophagy pathway may also participate in traditional phagocytosis. In this study, we show that Dectin-1 signaling in macrophages and bone marrow-derived dendritic cells triggers formation of LC3II, a major component of the autophagy machinery. Further, Dectin-1 directs the recruitment of LC3II to phagosomes, and this requires Syk, activation of reactive oxygen production by the NADPH oxidase, and ATG5. Using LC3-deficient dendritic cells we show that whereas LC3 recruitment to phagosomes is not important for triggering phagocytosis, killing or Dectin-1-mediated inflammatory cytokine production, it facilitates recruitment of MHC class II molecules to phagosomes and promotes presentation of fungal-derived antigens to CD4 T cells.
- University of California, San Francisco United States
- Cedars-Sinai Medical Center United States
CD4-Positive T-Lymphocytes, Biochemistry & Molecular Biology, beta-Glucans, Biomedical and clinical sciences, Antigens, Fungal, Knockout, Immunology, 610, Bone Marrow Cells, 612, Medical and Health Sciences, Autophagy-Related Protein 5, Cell Line, Mice, Lectins, Phagosomes, Syk Kinase, Animals, Lectins, C-Type, Antigens, Mice, Knockout, Antigen Presentation, Biomedical and Clinical Sciences, C-Type, Inflammatory and immune system, Macrophages, Histocompatibility Antigens Class II, Intracellular Signaling Peptides and Proteins, NADPH Oxidases, Dendritic Cells, Biological Sciences, Protein-Tyrosine Kinases, Enzyme Activation, Biological sciences, Emerging Infectious Diseases, Infectious Diseases, Fungal, Chemical sciences, Chemical Sciences, Microtubule-Associated Proteins, Protein Binding
CD4-Positive T-Lymphocytes, Biochemistry & Molecular Biology, beta-Glucans, Biomedical and clinical sciences, Antigens, Fungal, Knockout, Immunology, 610, Bone Marrow Cells, 612, Medical and Health Sciences, Autophagy-Related Protein 5, Cell Line, Mice, Lectins, Phagosomes, Syk Kinase, Animals, Lectins, C-Type, Antigens, Mice, Knockout, Antigen Presentation, Biomedical and Clinical Sciences, C-Type, Inflammatory and immune system, Macrophages, Histocompatibility Antigens Class II, Intracellular Signaling Peptides and Proteins, NADPH Oxidases, Dendritic Cells, Biological Sciences, Protein-Tyrosine Kinases, Enzyme Activation, Biological sciences, Emerging Infectious Diseases, Infectious Diseases, Fungal, Chemical sciences, Chemical Sciences, Microtubule-Associated Proteins, Protein Binding
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