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Reading NC, Kasper DL. The starting lineup: key microbial players in intestinal immunity and homeostasis. Front Microbiol. 2011;2:148doi: 10.3389/fmicb.2011.00148.
Reading, N. C., & Kasper, D. L. (2011). The starting lineup: key microbial players in intestinal immunity and homeostasis. Frontiers in microbiology, 2148. https://doi.org/10.3389/fmicb.2011.00148
Reading, Nicola C, and Kasper, Dennis L. "The starting lineup: key microbial players in intestinal immunity and homeostasis." Frontiers in microbiology vol. 2 (2011): 148. doi: https://doi.org/10.3389/fmicb.2011.00148
Reading NC, Kasper DL. The starting lineup: key microbial players in intestinal immunity and homeostasis. Front Microbiol. 2011 Jul 07;2:148. doi: 10.3389/fmicb.2011.00148. eCollection 2011. PMID: 21779278; PMCID: PMC3133820.
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Front Microbiol. 2011 Jul 07;2:148. doi: 10.3389/fmicb.2011.00148. eCollection 2011.

The starting lineup: key microbial players in intestinal immunity and homeostasis.

Frontiers in microbiology

Nicola C Reading, Dennis L Kasper

Affiliations

  1. Channing Laboratory, Department of Medicine, Brigham and Women's Hospital Boston, MA, USA.

PMID: 21779278 PMCID: PMC3133820 DOI: 10.3389/fmicb.2011.00148

Abstract

The complexity of microbiota inhabiting the intestine is increasingly apparent. Delicate balance of numerous bacterial species can affect development of the immune system, how susceptible a host is to pathogenic organisms, and the auto-inflammatory state of the host. In the last decade, with the increased use of germ-free mice, gnotobiotic mice, and animal models in which a germ-free animal has been colonized with a foreign microbiota such as humanized mice, it has been possible to delineate relationships that specific bacteria have with the host immune system and to show what role they may play in overall host health. These models have not only allowed us to tease out the roles of individual species, but have also allowed the discovery and characterization of functionally unknown organisms. For example, segmented filamentous bacteria (SFB) have been shown to play a vital role in expansion of IL-17 producing cells. Prior to linking their key role in immune system development, little was known about these organisms. Bacteroides fragilis can rescue some of the immune defects of gnotobiotic mice after mono-colonization and have anti-inflammatory properties that can alleviate colitis and experimental allergic encephalitis in murine models. Additionally, Clostridium species have most recently been shown to expand regulatory T-cell populations leading to anti-inflammatory conditions. This review will highlight and summarize some of the major findings within the last decade concerning the role of select groups of bacteria including SFB, Clostridium, Bacteroides, Bifidobacterium, and Lactobacillus, and their impact on host mucosal immune systems.

Keywords: Bacteroides fragilis; Clostridium; germ-free; homeostasis; microbiome; mono-colonization; probiotics; segmented filamentous bacteria

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