Cited by 697Immune Response and InflammationGastrointestinal motility and disordersInflammatory Bowel Disease

Toll-like receptor 2 controls mucosal inflammation by regulating epithelial barrier function

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Cario, E., Gerken, G., Podolsky, D.K.·2007·Gastroenterology

Abstract

Background & aims Toll-like receptors (TLRs) represent a class of transmembrane pattern recognition receptors essential for microbial recognition and control of innate immune responses. Commensal bacteria play an important role in maintaining tolerance and active stability of the intestinal epithelial barrier by suppressing intestinal inflammation, yet the mechanisms of action are unknown. The aim of this study was to determine the functional relevance of TLR2 to control tight junction (TJ)-associated intestinal epithelial barrier integrity to balance mucosal homeostasis against inflammatory stress-induced damage.Methods TLR2 ligand (synthetic Pam(3)Cys-SK4 [PCSK])-induced activation of signaling cascades and TJ-associated distribution was assessed by using Western blotting and confocal microscopy combined with functional transfection and inhibitor studies in model intestinal epithelial cell (IEC) lines (IEC-6, Caco-2) or primary IEC cultured short-term ex vivo. DSS colitis was induced by standard protocol in wild-type, TLR2-/-, and MyD88-/- mice. Spontaneous apoptosis was assessed by terminal deoxinucleotidyl-transferase-mediated dUTP-biotin nick end-labeling.Results Data from in vitro and ex vivo models of intestinal epithelial cells revealed that TLR2 stimulation effectively preserves TJ-associated barrier assembly against stress-induced damage through promotion of PI3K/Akt-mediated cell survival via MyD88. Furthermore, in vivo studies underscored that TLR2-mediated TJ regulation critically determines susceptibility to intestinal injury and inflammation. Inflammatory stress in mice deficient of TLR2 or MyD88 induced early TJ-associated disruption interrelated with anti-apoptotic failure of the intestinal epithelial barrier. Oral treatment of colitis with the TLR2 ligand PCSK significantly suppressed mucosal inflammation and apoptosis by efficiently restoring TJ-associated integrity of the intestinal epithelium in vivo.Conclusion TLR2 may provide a target to pharmacologically modulate mucosal injury and intestinal inflammation.

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Crossref · 10.1053/j.gastro.2007.02.056

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  • Oral treatment with the TLR2 ligand PCSK significantly suppressed mucosal inflammation and apoptosis by efficiently restoring TJ-associated integrity of the intestinal epithelium in a mouse colitis model.

    “In this study, the authors showed that oral treatment with the TLR2 ligand, PCSK significantly suppressed mucosal inflammation and apoptosis by efficiently restoring TJ-associated integrity of the intestinal epithelium in a mouse colitis model.159”
  • TLR2 stimulation effectively preserves TJ-associated barrier assembly against stress-induced damage through promotion of PI3K/Akt-mediated cell survival in an MyD88-dependent manner.

    “Furthermore, Cario et al159 demonstrated using both in vitro and ex vivo models that TLR2 stimulation effectively preserves TJ-associated barrier assembly against stress-induced damage through promotion of PI3K/Akt-mediated cell survival in an MyD88-dependent manner.”

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Authors
Cario, E., Gerken, G., & Podolsky, D. K.
Affiliations
  • Essen University Hospital (DE)
  • Harvard University (US)
Corresponding author
Cario, E.
Venue
Gastroenterology
Publisher
Elsevier BV
Published
2007-04
Volume
132
Issue
4
Pages
1359-1374
ISSN
0016-5085 (ISSN-L)
OpenAlex
W2106694537
Cited by
697
References
55
Citations by year
2026: 16 · 2025: 21 · 2024: 26 · 2023: 31 · 2022: 29 · 2021: 44 · 2020: 30 · 2019: 32 · 2018: 32 · 2017: 31 · 2016: 30 · 2015: 42 · 2014: 39 · 2013: 47 · 2012: 49
FWCI
18.11
Type
journal article
Language
en
Open access
Locations
  • Gastroenterology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK-60049, DK-41557, DK 43351, R01DK060049, P30DK043351)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Inflammatory Bowel Disease
Keywords
TLR2, intestinal epithelial barrier, tight junctions, mucosal inflammation, DSS-induced colitis, MyD88, PI3K/Akt signaling, epithelial apoptosis, commensal bacteria, innate immunity
MeSH terms
Animals, Cell Line, Cell Survival, Colitis, Disease Models, Animal, Epithelium, Female, Immunohistochemistry, Intestinal Mucosa, Mice, Inbred C57BL, Peptides, Permeability, Plasma Substitutes, Severity of Illness Index, Blotting, Western, Dextran Sulfate, Apoptosis, Microscopy, Confocal, Toll-Like Receptor 2, Mice, Lipopeptides

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