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Macroautophagy Proteins Control MHC Class I Levels on Dendritic Cells and Shape Anti-viral CD8(+) T Cell Responses #MMPMID27117419
Loi M; Muller A; Steinbach K; Niven J; Barreira da Silva R; Paul P; Ligeon LA; Caruso A; Albrecht RA; Becker AC; Annaheim N; Nowag H; Dengjel J; Garcia-Sastre A; Merkler D; Munz C; Gannage M
Cell Rep 2016[May]; 15 (5): 1076-1087 PMID27117419show ga
The macroautophagy machinery has been implicated in MHC class II restricted antigen presentation. Here, we report that this machinery assists in the internalization of MHC class I molecules. In the absence of the autophagy factors Atg5 and Atg7, MHC class I surface levels are elevated due to decreased endocytosis and degradation. Internalization of MHC class I molecules occurs less efficiently if AAK1 cannot be recruited via Atg8/LC3B. In the absence of Atg-dependent MHC class I internalization, dendritic cells stimulate CD8(+) T cell responses more efficiently in vitro and in vivo. During viral infections, lack of Atg5 results in enhanced influenza- and LCMV-specific CD8(+) T cell responses in vivo. Elevated influenza-specific CD8(+) T cell responses are associated with better immune control of this infection. Thus, the macroautophagy machinery orchestrates T cell immunity by supporting MHC class II but compromises MHC class I restricted antigen presentation.
|Animals[MESH]
|Antigen Presentation/immunology[MESH]
|Autophagy-Related Protein 5/*genetics[MESH]
|Autophagy-Related Protein 7/*genetics[MESH]
|Autophagy/*immunology[MESH]
|CD8-Positive T-Lymphocytes/*immunology[MESH]
|Cells, Cultured[MESH]
|Dendritic Cells/*immunology[MESH]
|Endocytosis/immunology[MESH]
|Histocompatibility Antigens Class I/*immunology[MESH]
|Histocompatibility Antigens Class II/immunology[MESH]
|Humans[MESH]
|Influenza A Virus, H1N1 Subtype/*immunology[MESH]