Cited by 718Immune Response and InflammationGut microbiota and healthT-cell and B-cell Immunology

Outer Membrane Vesicles of a Human Commensal Mediate Immune Regulation and Disease Protection

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Shen, Yue, Torchia, Maria Letizia Giardino, Lawson, Gregory W., Karp, Christopher L., Ashwell, Jonathan D., Mazmanian, Sarkis K.·2012·Cell Host & Microbe

Abstract

Commensal bacteria impact host health and immunity through various mechanisms, including the production of immunomodulatory molecules. Bacteroides fragilis produces a capsular polysaccharide (PSA), which induces regulatory T cells and mucosal tolerance. However, unlike pathogens, which employ secretion systems, the mechanisms by which commensal bacteria deliver molecules to the host remain unknown. We reveal that Bacteroides fragilis releases PSA in outer membrane vesicles (OMVs) that induce immunomodulatory effects and prevent experimental colitis. Dendritic cells (DCs) sense OMV-associated PSA through TLR2, resulting in enhanced regulatory T cells and anti-inflammatory cytokine production. OMV-induced signaling in DCs requires growth arrest and DNA-damage-inducible protein (Gadd45α). DCs treated with PSA-containing OMVs prevent experimental colitis, whereas Gadd45α(-/-) DCs are unable to promote regulatory T cell responses or suppress proinflammatory cytokine production and host pathology. These findings demonstrate that OMV-mediated delivery of a commensal molecule prevents disease, uncovering a mechanism of interkingdom communication between the microbiota and mammals.

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Crossref · 10.1016/j.chom.2012.08.004

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  • PSA produced by Leuconostoc mesenteroides strain NTM048 or Bacteroides fragilis acts as an immunostimulant to enhance the mucosal barrier and influence systemic immune responses.

    “Furthermore, PSA produced by Leuconostoc mesenteroides strain NTM048 or Bacteroides fragilis acts as an immunostimulant to enhance the mucosal barrier and influence systemic immune responses [111, 112] (Fig. 5G).”
  • Some bacterial species promote Treg development through polysaccharide A and TLR signaling to dendritic cells.

    “some bacterial species have been shown to drive Treg development via alternative pathways dependent on polysaccharide A and TLR signaling to dendritic cells”

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Authors
Shen, Y., Torchia, M. L. G., Lawson, G. W., Karp, C. L., Ashwell, J. D., & Mazmanian, S. K.
Affiliations
  • California Institute of Technology (US)
  • National Institutes of Health (US)
  • University of California, Los Angeles (US)
  • Cincinnati Children's Hospital Medical Center (US)
Corresponding author
Mazmanian, Sarkis K.
Venue
Cell Host & Microbe
Publisher
Elsevier BV
Published
2012-10
Volume
12
Issue
4
Pages
509-520
ISSN
1931-3128 (ISSN-L)
OpenAlex
W2051349444
Cited by
714
References
41
Citations by year
2026: 59 · 2025: 84 · 2024: 60 · 2023: 61 · 2022: 69 · 2021: 83 · 2020: 61 · 2019: 48 · 2018: 34 · 2017: 40 · 2016: 30 · 2015: 27 · 2014: 33 · 2013: 23 · 2012: 1
FWCI
11.75
Type
journal article
Language
en
Open access
Locations
  • Cell Host & Microbe (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (T32GM007616, GM007616)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 078938, R01DK078938, R21DK083633, R56DK078938)
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
outer membrane vesicles, Bacteroides fragilis, capsular polysaccharide, commensal bacteria, regulatory T cells, dendritic cells, TLR2, GADD45A, experimental colitis, mucosal tolerance, immunomodulation, interkingdom communication, gut microbiota, anti-inflammatory cytokines
MeSH terms
GADD45 Proteins, Animals, Bacteroides fragilis, Dendritic Cells, Immunologic Factors, Mice, Inbred BALB C, Mice, Inbred C57BL, Nuclear Proteins, Polysaccharides, Bacterial, Cytokines, Mice, Knockout, Cell Cycle Proteins, Gene Expression Profiling, T-Lymphocytes, Regulatory, Toll-Like Receptor 2, Mice, Exosomes

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