Cited by 1,604Immune Response and InflammationGut microbiota and healthT-cell and B-cell Immunology

The Toll-like receptor 2 pathway establishes colonization by a commensal of the human microbiota

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Round, June L., Lee, S. Melanie, Li, Jennifer, Tran, Gloria, Jabri, Bana, Chatila, Talal A., Mazmanian, Sarkis K.·2011·Science

Abstract

Mucosal surfaces constantly encounter microbes. Toll-like receptors (TLRs) mediate recognition of microbial patterns to eliminate pathogens. By contrast, we demonstrate that the prominent gut commensal Bacteroides fragilis activates the TLR pathway to establish host-microbial symbiosis. TLR2 on CD4(+) T cells is required for B. fragilis colonization of a unique mucosal niche in mice during homeostasis. A symbiosis factor (PSA, polysaccharide A) of B. fragilis signals through TLR2 directly on Foxp3(+) regulatory T cells to promote immunologic tolerance. B. fragilis lacking PSA is unable to restrain T helper 17 cell responses and is defective in niche-specific mucosal colonization. Therefore, commensal bacteria exploit the TLR pathway to actively suppress immunity. We propose that the immune system can discriminate between pathogens and the microbiota through recognition of symbiotic bacterial molecules in a process that engenders commensal colonization.

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Authors
Round, J. L., Lee, S. M., Li, J., Tran, G., Jabri, B., Chatila, T. A., & Mazmanian, S. K.
Affiliations
  • California Institute of Technology (US)
  • Department of Pathology, Department of Pediatrics, Department of Medicine, University of Chicago, Chicago, IL 60637, USA.
  • University of California, Los Angeles (US)
Corresponding author
  • Round, June L.
  • Mazmanian, Sarkis K.
Venue
Science
Published
2011-05-20
Volume
332
Issue
6032
Pages
974-977
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2103561589
Cited by
1,604
References
28
Citations by year
2026: 58 · 2025: 89 · 2024: 81 · 2023: 99 · 2022: 114 · 2021: 103 · 2020: 128 · 2019: 103 · 2018: 103 · 2017: 114 · 2016: 114 · 2015: 101 · 2014: 118 · 2013: 119 · 2012: 101
FWCI
55.17
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
National Institutes of Health (AI 080002, DK 078938, DK 083633, AI 088626)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
Keywords
TLR2, Bacteroides fragilis, gut microbiota, commensal colonization, polysaccharide A, regulatory T cells, Foxp3, CD4+ T cells, Th17 cells, mucosal immunity, immune tolerance, host-microbe symbiosis, pathogen recognition
MeSH terms
Animals, Bacteroides fragilis, Colon, Germ-Free Life, Homeostasis, Humans, Immune Tolerance, Intestinal Mucosa, Mice, Inbred C57BL, Models, Biological, Polysaccharides, Bacterial, Specific Pathogen-Free Organisms, Symbiosis, Signal Transduction, Interleukin-10, Immunity, Mucosal, T-Lymphocytes, Regulatory, Toll-Like Receptor 2, Mice, Metagenome, Th17 Cells

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