Cited by 47Burn Injury Management and OutcomesImmune Response and InflammationGastrointestinal motility and disorders

Toll-like receptor-4 mediates intestinal barrier breakdown after thermal injury

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Peterson, Carrie Y., Costantini, Todd W., Loomis, William H., Putnam, James G., Wolf, Paul, Bansal, Vishal, Eliceiri, Brian P., Baird, Andrew +1 more·2010·Surgical Infections

Abstract

OBJECTIVE: Toll-like receptor 4 (TLR-4) activation after sterile injury leads to organ dysfunction at distant sites. We have shown previously that intestinal barrier breakdown and alteration of tight junction proteins follows thermal injury; however, the role of TLR-4 in this process remains unclear. We hypothesized that increased intestinal permeability and barrier breakdown after burns is a TLR-4 dependent process; hence, knocking down the TLR-4 gene would have a protective effect on burn-induced intestinal dysfunction. METHODS: Male C57BL/6J (TLR-4 wild type [WT]) and C57BL/10ScN (TLR-4 knockout [KO]) mice were assigned randomly to either 30% total body surface area steam burn or sham injury. At 4 h, permeability to intraluminally administered fluorescein isothiocyanate (FITC)-dextran was assessed by measuring the fluorescence of the serum. Intestinal samples were analyzed for the presence of the tight junction protein occludin by immunoblotting and immunohistochemistry. Tumor necrosis factor (TNF)-alpha concentrations in the serum and intestines were measured by enzyme-linked immunosorbent assay at 2 h post-burn. RESULTS: Serum concentrations of FITC-dextran were decreased in TLR-4 KO mice compared with TLR-4 WT mice after burn injury (92.0 micrograms/mL and 264.5 micrograms/mL, respectively; p < 0.05). After injury, no difference in intestinal permeability was observed between the TLR-4 KO mice and the TLR-4 WT sham-treated mice. The TLR-4 KO mice had preservation of occludin concentrations after thermal injury in both immunoblot and immunohistochemistry assays, but concentrations were decreased in TLR-4 WT animals. The serum concentrations of TNF-alpha serum were higher in TLR-4 WT burned animals than in the sham-treated mice. The TLR-4 KO animals had unmeasurable concentrations of TNF-alpha. No differences in TNF-alpha were observed in the intestinal tissue at 2 h. CONCLUSIONS: Mice with TLR-4 KO have less intestinal permeability to FITC-dextran than do TLR-4 WT mice after burn injury as a result of alterations in the tight junction protein occludin. These findings suggest that the greater intestinal permeability and barrier breakdown after burn injury is a TLR-4-dependent process. Toll-like receptor 4 may provide a useful target for the prevention and treatment of systemic inflammatory response syndrome and multisystem organ failure after injury.

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  • TLR4-/- mice exhibited less intestinal permeability compared with wild type mice in a burn injury model due to unaltered expression of the TJ protein OCLN.

    “TLR4–/– mice exhibited less intestinal permeability (FITC-dextran permeability assay) compared with wild type mice in a burn injury model due to unaltered expression of the TJ protein OCLN.163”

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  1. [15]Mangotti LJ. Deitch EA. Burns, bacterial translocation, gut barrier function, and failure. J Burn Care Rehab. 2005;25:383–391. doi: 10.1097/01.bcr.0000176878.79267.e8. [DOI] [PubMed] [Google Scholar] · DOI
  2. [25]Costantini TW. Loomis WH. Putnam JG, et al. Burn-induced gut barrier injury is attenuated by phosphodiesterase inhibition: Effects on tight junction structural proteins. Shock. 2009;31:416–422. doi: 10.1097/SHK.0b013e3181863080. [DOI] [PMC free article] [PubMed] [Google Scholar] · DOI

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Authors
Peterson, C. Y., Costantini, T. W., Loomis, W. H., Putnam, J. G., Wolf, P., Bansal, V., Eliceiri, B. P., Baird, A., & Coimbra, R.
Affiliations
  • University of California San Diego (US)
  • Veterans Health Administration (US)
Corresponding author
Coimbra, Raul
Venue
Surgical Infections
Published
2010-04
Volume
11
Issue
2
Pages
137-144
ISSN
  • 1096-2964 (ISSN-L)
  • 1557-8674
OpenAlex
W2059816251
Cited by
47
References
48
Citations by year
2025: 1 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 9 · 2020: 4 · 2019: 3 · 2018: 1 · 2017: 3 · 2016: 1 · 2015: 3 · 2014: 3 · 2013: 3 · 2012: 4
FWCI
2.33
Type
journal article
Language
en
Open access
Locations
  • Surgical Infections (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of General Medical Sciences (P20GM078421)
Topics
  • Health Sciences › Medicine › Epidemiology › Burn Injury Management and Outcomes
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
Keywords
TLR4, intestinal permeability, burns, occludin, tight junction proteins, TNF-α, sterile inflammation
MeSH terms
Animals, Burns, Dextrans, Humans, Immunohistochemistry, Male, Membrane Proteins, Mice, Inbred C57BL, Permeability, Tumor Necrosis Factor-alpha, Immunoblotting, Fluorescein-5-isothiocyanate, Mice, Knockout, Gastrointestinal Tract, Toll-Like Receptor 4, Mice, Occludin

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