Intestinal Permeability & Zonulin - References

Intestinal Permeability & Zonulin — Literature Dossier

Navigation

• Backed Topic Note: Intestinal Permeability & Zonulin
• References Hub: 03 - Diagnostics & Quantified Self References MOC
• Parent Silo MOC: 03 - Diagnostics & Quantified Self MOC

---

Landmark Peer-Reviewed Studies

1. Cani et al. (2007) — Metabolic Endotoxemia Initiates Obesity and Insulin Resistance

• Citation: Cani, P. D., Amar, J., Iglesias, M. A., Poggi, M., Knauf, C., Bastelica, D., … & Burcelin, R. (2007). Metabolic endotoxemia initiates obesity and insulin resistance. Diabetes, 56(7), 1761–1772.
• Identifiers: DOI: 10.2337/db06-1491 (DOI · SciDB · Scholar) | PMID: 17456850 (PubMed · Europe PMC)
• Study Design & Cohort: Translational human dietary endotoxemia profiling combined with continuous low-dose LPS infusion and CD14-knockout mechanistic models.
• Quantitative Findings & Diagnostic Thresholds:
  • High-fat feeding increased plasma lipopolysaccharide (LPS) 2- to 3-fold (“metabolic endotoxemia”) by reducing tight-junction proteins (ZO-1 and occludin) and Bifidobacterium spp.
  • Experimentally clamped low-grade endotoxemia increased fasting glycemia, fasting insulinemia, hepatic triglyceride accumulation, and visceral adipose TNF-$\alpha$/IL-1$\beta$/IL-6 to the exact same magnitude as a high-fat diet, while CD14/TLR4 ablation completely prevented insulin resistance.

2. Fasano (2011) — Zonulin and Its Regulation of Intestinal Barrier Function: The Biological Door to Inflammation, Autoimmunity, and Cancer

• Citation: Fasano, A. (2011). Zonulin and its regulation of intestinal barrier function: the biological door to inflammation, autoimmunity, and cancer. Physiological Reviews, 91(1), 151–175.
• Identifiers: DOI: 10.1152/physrev.00003.2008 (DOI · SciDB · Scholar) | PMID: 21248165 (PubMed · Europe PMC)
• Study Design & Cohort: Comprehensive mechanistic and clinical synthesis establishing pre-haptoglobin 2 (zonulin) as the endogenous human modulator of intercellular tight junctions.
• Quantitative Findings & Diagnostic Thresholds:
  • Demonstrated that gliadin peptides (via CXCR3/MyD88) and small-intestinal bacterial colonization induce luminal zonulin release within 15–30 minutes, decreasing transepithelial electrical resistance (TEER) by > 40% and increasing paracellular Lactulose:Mannitol permeability prior to the onset of clinical autoimmune biomarkers in Type 1 diabetes and celiac disease.

3. Zhou et al. (2019) — Randomised Placebo-Controlled Trial of Dietary Glutamine Supplements for Post-Infectious Irritable Bowel Syndrome with Increased Intestinal Permeability

• Citation: Zhou, Q., Verne, M. L., Fields, J. Z., Lefante, J. J., Basra, S., Salameh, H., & Verne, G. N. (2019). Randomised placebo-controlled trial of dietary glutamine supplements for post-infectious irritable bowel syndrome. Gut, 68(6), 996–1002.
• Identifiers: DOI: 10.1136/gutjnl-2017-315136 (DOI · SciDB · Scholar) | PMID: 30108163 (PubMed · Europe PMC) | PMCID: PMC9549483 (PMC Full Text)
• Study Design & Cohort: Randomized, double-blind, placebo-controlled 8-week clinical trial ($N=106$ patients with confirmed elevated intestinal permeability [$\text{Lactulose:Mannitol ratio}>0.07$] randomized to L-Glutamine $5\text{ g }3\times \text{/day}$ [$15\text{ g/day}$] vs. placebo).
• Quantitative Findings & Diagnostic Thresholds:
  • L-Glutamine normalized intestinal permeability (urinary Lactulose:Mannitol ratio reduced from $0.11\pm 0.03$ to $0.04\pm 0.02$, $p<0.0001$) in 88.9% of treated patients (vs. $5.8\%$ on placebo), achieving the primary clinical endpoint in 79.6% vs. 5.8% ($p<0.0001$, $\text{NNT}=1.4$).

4. Davison et al. (2016) — Zinc Carnosine and Bovine Colostrum Truncate Exercise-Induced Gut Permeability

• Citation: Davison, G., Marchbank, T., March, D. S., Thatcher, R., & Playford, R. J. (2016). Zinc carnosine works with bovine colostrum in truncating heavy exercise–induced increase in gut permeability in healthy volunteers. The American Journal of Clinical Nutrition, 104(2), 526–536.
• Identifiers: DOI: 10.3945/ajcn.116.134403 (DOI · SciDB · Scholar) | PMID: 27357095 (PubMed · Europe PMC)
• Study Design & Cohort: 4-arm double-blind, placebo-controlled crossover RCT in human athletes ($N=8$ completing all 4 arms: Placebo, Zinc Carnosine [$37.5\text{ mg }2\times \text{/day}$], Bovine Colostrum [$500\text{ mg }2\times \text{/day}$], or Combined for 14 days prior to high-intensity hyperthermic running) paired with Caco-2 tight-junction assays.
• Quantitative Findings & Diagnostic Thresholds:
  • Heavy exercise under placebo caused a 3-fold spike in the 5-sugar urinary Lactulose:Rhamnose permeability ratio ($p<0.01$); Zinc Carnosine or Colostrum alone attenuated the permeability rise by ~70%, and the combination truncated exercise-induced barrier breakdown by 75% ($p<0.001$) by increasing HSP70 and stabilizing ZO-1 and occludin phosphorylation.