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The Peyer's patch mononuclear phagocyte system at steady state and during infection

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Abstract
The gut represents a potential entry site for a wide range of pathogens including protozoa, bacteria, viruses, or fungi. Consequently, it is protected by one of the largest and most diversified population of immune cells of the body. Its surveillance requires the constant sampling of its encounters by dedicated sentinels composed of follicles and their associated epithelium located in specialized area. In the small intestine, Peyer's patches (PPs) are the most important of these mucosal immune response inductive sites. Through several mechanisms including transcytosis by specialized epithelial cells called M-cells, access to the gut lumen is facilitated in PPs. Although antigen sampling is critical to the initiation of the mucosal immune response, pathogens have evolved strategies to take advantage of this permissive gateway to enter the host and disseminate. It is, therefore, critical to decipher the mechanisms that underlie both host defense and pathogen subversive strategies in order to develop new mucosal-based therapeutic approaches. Whereas penetration of pathogens through M cells has been well described, their fate once they have reached the subepithelial dome (SED) remains less well understood. Nevertheless, it is clear that the mononuclear phagocyte system (MPS) plays a critical role in handling these pathogens. MPS members, including both dendritic cells and macrophages, are indeed strongly enriched in the SED, interact with M cells, and are necessary for antigen presentation to immune effector cells. This review focuses on recent advances, which have allowed distinguishing the different PP mononuclear phagocyte subsets. It gives an overview of their diversity, specificity, location, and functions. Interaction of PP phagocytes with the microbiota and the follicle- associated epithelium as well as PP infection studies are described in the light of these new criteria of PP phagocyte identification. Finally, known alterations affecting the different phagocyte subsets during PP stimulation or infection are discussed.
Keywords
INTESTINAL M-CELLS, FOLLICLE-ASSOCIATED EPITHELIUM, PLASMACYTOID, DENDRITIC CELLS, C-TYPE LECTIN, SEGMENTED FILAMENTOUS BACTERIA, RESIDENT, COMMENSAL BACTERIA, T-CELLS, LYMPHOID-TISSUES, SALMONELLA-TYPHIMURIUM, B-CELL, mucosal immunity, Peyer's patch, dendritic cells, macrophages, M cells, microbiota, IgA, bacterial and viral infections

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Citation

Please use this url to cite or link to this publication:

Chicago
Da Silva, Clement, Camille Wagner, Johnny Bonnardel, Jean-Pierre Gorvel, and Hugues Lelouard. 2017. “The Peyer’s Patch Mononuclear Phagocyte System at Steady State and During Infection.” Frontiers in Immunology 8.
APA
Da Silva, C., Wagner, C., Bonnardel, J., Gorvel, J.-P., & Lelouard, H. (2017). The Peyer’s patch mononuclear phagocyte system at steady state and during infection. FRONTIERS IN IMMUNOLOGY, 8.
Vancouver
1.
Da Silva C, Wagner C, Bonnardel J, Gorvel J-P, Lelouard H. The Peyer’s patch mononuclear phagocyte system at steady state and during infection. FRONTIERS IN IMMUNOLOGY. 2017;8.
MLA
Da Silva, Clement et al. “The Peyer’s Patch Mononuclear Phagocyte System at Steady State and During Infection.” FRONTIERS IN IMMUNOLOGY 8 (2017): n. pag. Print.
@article{8605524,
  abstract     = {The gut represents a potential entry site for a wide range of pathogens including protozoa, bacteria, viruses, or fungi. Consequently, it is protected by one of the largest and most diversified population of immune cells of the body. Its surveillance requires the constant sampling of its encounters by dedicated sentinels composed of follicles and their associated epithelium located in specialized area. In the small intestine, Peyer's patches (PPs) are the most important of these mucosal immune response inductive sites. Through several mechanisms including transcytosis by specialized epithelial cells called M-cells, access to the gut lumen is facilitated in PPs. Although antigen sampling is critical to the initiation of the mucosal immune response, pathogens have evolved strategies to take advantage of this permissive gateway to enter the host and disseminate. It is, therefore, critical to decipher the mechanisms that underlie both host defense and pathogen subversive strategies in order to develop new mucosal-based therapeutic approaches. Whereas penetration of pathogens through M cells has been well described, their fate once they have reached the subepithelial dome (SED) remains less well understood. Nevertheless, it is clear that the mononuclear phagocyte system (MPS) plays a critical role in handling these pathogens. MPS members, including both dendritic cells and macrophages, are indeed strongly enriched in the SED, interact with M cells, and are necessary for antigen presentation to immune effector cells. This review focuses on recent advances, which have allowed distinguishing the different PP mononuclear phagocyte subsets. It gives an overview of their diversity, specificity, location, and functions. Interaction of PP phagocytes with the microbiota and the follicle- associated epithelium as well as PP infection studies are described in the light of these new criteria of PP phagocyte identification. Finally, known alterations affecting the different phagocyte subsets during PP stimulation or infection are discussed.},
  articleno    = {1254},
  author       = {Da Silva, Clement and Wagner, Camille and Bonnardel, Johnny and Gorvel, Jean-Pierre and Lelouard, Hugues},
  issn         = {1664-3224},
  journal      = {FRONTIERS IN IMMUNOLOGY},
  keywords     = {INTESTINAL M-CELLS,FOLLICLE-ASSOCIATED EPITHELIUM,PLASMACYTOID,DENDRITIC CELLS,C-TYPE LECTIN,SEGMENTED FILAMENTOUS BACTERIA,RESIDENT,COMMENSAL BACTERIA,T-CELLS,LYMPHOID-TISSUES,SALMONELLA-TYPHIMURIUM,B-CELL,mucosal immunity,Peyer's patch,dendritic cells,macrophages,M cells,microbiota,IgA,bacterial and viral infections},
  language     = {eng},
  pages        = {17},
  title        = {The Peyer's patch mononuclear phagocyte system at steady state and during infection},
  url          = {http://dx.doi.org/10.3389/fimmu.2017.01254},
  volume       = {8},
  year         = {2017},
}

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