Laboratory / cell studyindependent cross-checkabstract checked★ key study I-WHT-121 in-depth review
In the lab, gliadin made gut tissue leakier in everyone
Effect of gliadin on permeability of intestinal biopsy explants from celiac disease patients and patients with non-celiac gluten sensitivity.
Overview
Hollon J et al.. Nutrients 2015 · PMID 25734566 · DOI 10.3390/nu7031565
Biopsy samples from coeliac patients, gluten-sensitive people and controls all became more permeable when exposed to gliadin for two hours.
Does the study support the specific claim? Partly · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Gliadin and gut permeability.
- How was the study done?
Biopsy explants.
- How many people, animals or samples were studied?
23 donors.
- What was actually found?
Permeability rose in all groups.
- How large was the observed effect?
Not quantified in abstract.
- What do the results mean in everyday life?
Lab effect exists.
- What are the study's limitations?
Ex vivo, tiny groups.
- What does it say about Elawady's specific claim?
Supports the lab premise only.
- Do the results apply to Germany and Europe?
High.
- What can explicitly not be concluded from this study?
Cannot show harm in living healthy people.
Scientific in-depth review
1. Full reference
- Authors
- Hollon J et al.
- Journal
- Nutrients
- Year
- 2015
- Identifier
- PMID 25734566 DOI 10.3390/nu7031565 · PMC4377866
- Verification
- verified – PubMed efetch 2026-10-26; Crossref works API 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
not stated in abstract
2. Research question
Does gliadin increase permeability of intestinal biopsies from coeliac, NCGS and control subjects?
3. Study design and population
- Study design
- Laboratory / cell study – Ex vivo biopsy explant study
- Population
Duodenal biopsies: active coeliac (6), coeliac in remission (6), gluten-sensitive (6), non-coeliac controls (5)
- Country
not stated in abstract
- Period
not stated in abstract
- Sample size
23 donors
- Inclusion and exclusion criteria
Four diagnostic groups
4. Methods and endpoints
- Exposure / intervention
Luminal gliadin
- Comparator
Media alone
- Endpoints
Transepithelial electrical resistance; cytokines
- Statistical methods
Group comparisons
5. Actual results
- Results
Explants from all groups showed greater permeability increase with gliadin than with media alone; increase larger in active coeliac than in remission and controls; gluten-sensitive greater than remission; no difference between controls and gluten-sensitive or between remission and controls.
- Absolute risks
not reported
- Authors' conclusion
Increased intestinal permeability after gliadin exposure occurs in all individuals.
6. Strengths
- Human tissue
- Comparison groups
7. Weaknesses
- Ex vivo, 120 minutes
- Very small groups
- Isolated gliadin, not food
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Laboratory model.
9. Assessment of the statistical interpretation
No effect sizes in abstract.
10. Relevance to the specific claim
Honest support for the laboratory premise: gliadin raises permeability ex vivo even in controls.
11. Independent contrary findings
I-WHT-122 (no in vivo permeability change), I-WHT-123 (zonulin assay problems).
12. Transferability to Germany and Europe
High (biology).
13. Overall methodological judgement
Mechanistic support only.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | some concerns |
| Precision of results | low |
| Directness | very indirect |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
In vivo relevance.