Innate immunity
How do E. coli vesicles talk to gut epithelium?
Open access · cc by · source: Europe PMC
Outer membrane vesicles from probiotic and commensal E. coli deliver ligands that activate NOD1-mediated immune responses in intestinal epithelial cells.
Study at a glance
- Design
- Animal / in-vitro — OMVs from probiotic/commensal E. coli tested on intestinal epithelial innate sensors (NOD1)
- N
- Caco-2/HT-29 cell assays — no single primary analytic N
- Population
- Human intestinal epithelial cell lines exposed to E. coli OMVs
- Outcome
- NOD1-dependent epithelial innate responses to bacterial OMVs
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
OMVs carry PRR ligands (e.g., PG for NOD1/NOD2) enabling bacteria–host communication across mucus; they modulate epithelial innate responses and barrier functions.
Methodology
Studied OMVs from probiotic/commensal E. coli and their interactions with intestinal epithelial innate sensors, focusing on NOD1 pathways.
Limitations
Cell/epithelial mechanism is not a full clinical probiotic trial in patients.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
OMVs carry PRR ligands (e.g., PG for NOD1/NOD2) enabling bacteria–host communication across mucus; they modulate epithelial innate responses and barrier functions.
Evidence for the claim as stated.
Probiotic and commensal E. coli OMVs carry peptidoglycan ligands for NOD1/NOD2 and modulate epithelial innate responses and barrier function across mucus. Imaging of vesicle–epithelium contact supports a communication route; it is not a full clinical probiotic trial.
Evidence for the claim as stated.
Confocal is used here for polarity reversal (enteroids), plasmodesmal targeting (PDLP), and vesicle itineraries (Bt OMVs in ~15 min; E. coli OMVs to NOD sensors). Those are different spatial questions — which face of an epithelium, which plant cell-wall channel, which endocytic route — and cannot be pooled as one 'trafficking phenotype'.
Evidence for the claim as stated.
Outer-membrane vesicles from probiotic and commensal E. coli carry peptidoglycan ligands for NOD1/NOD2, enabling bacteria–host communication across mucus and modulating epithelial innate responses and barrier functions. Cytokine ELISA is a common supporting readout for those epithelial responses, but the paper is a vesicle–PRR mechanism study, not a clinical probiotic trial and not an ELISA-methods paper.
Evidence for the claim as stated.
The three tagged studies disagree about what an 'ELISA paper' would even be measuring. MC4R work is cellular receptor trafficking and cAMP/ERK; MDV work is shedding, infectious period (~2 weeks) and sentinel timing (~9 days earlier) in chickens; E. coli OMV work is NOD1/NOD2 ligands and epithelial barrier signalling. They share an immunoassay-shaped supporting assay at most, not a common antigen.
Evidence for the claim as stated.
Implications also conflict if someone treats every plate assay as the same. A normal cAMP well for an MC4R variant can hide a trafficking defect relevant to obesity genetics; a high viral titre after leaky vaccination can hide increased transmission of hyperpathogenic MDV; an epithelial cytokine bump after OMVs is not probiotic efficacy in patients.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
Confocal is used here for polarity reversal (enteroids), plasmodesmal targeting (PDLP), and vesicle itineraries (Bt OMVs in ~15 min; E. coli OMVs to NOD sensors). Those are different spatial questions — which face of an epithelium, which plant cell-wall channel, which endocytic route — and cannot be pooled as one 'trafficking phenotype'.
- Supports · Apical-out enteroids for pathogen access
- Supports · How do proteins find plasmodesmata?
- Supports · How do gut-bacteria vesicles enter host cells?
The three tagged studies disagree about what an 'ELISA paper' would even be measuring. MC4R work is cellular receptor trafficking and cAMP/ERK; MDV work is shedding, infectious period (~2 weeks) and sentinel timing (~9 days earlier) in chickens; E. coli OMV work is NOD1/NOD2 ligands and epithelial barrier signalling. They share an immunoassay-shaped supporting assay at most, not a common antigen.
- Supports · How MC4R variants scramble receptor trafficking
- Supports · Can leaky vaccines favor nastier viruses?
Implications also conflict if someone treats every plate assay as the same. A normal cAMP well for an MC4R variant can hide a trafficking defect relevant to obesity genetics; a high viral titre after leaky vaccination can hide increased transmission of hyperpathogenic MDV; an epithelial cytokine bump after OMVs is not probiotic efficacy in patients.
- Supports · How MC4R variants scramble receptor trafficking
- Supports · Can leaky vaccines favor nastier viruses?
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