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Related Experiment Video

Updated: Jul 12, 2026

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Published on: February 9, 2016

Intestinal permeability in the ileal pouch

M N Merrett¹, N Soper, N Mortensen

¹Gastroenterology Unit, Radcliffe Infirmary, Oxford.

|August 1, 1996

Summary

Ileal pouch adaptation after surgery shows reduced permeability, correlating with colonic metaplasia. Pouchitis increases permeability, indicating a compromised epithelial barrier in this condition.

Area of Science:

Gastroenterology and Surgery
Epithelial Biology
Inflammatory Bowel Disease Research

Background:

Ileal pouch-anal anastomosis (IPAA) commonly results in villous atrophy, mucin changes (colonic metaplasia), and chronic inflammation.
A subset of patients with IPAA develop acute inflammation, known as pouchitis.

Purpose of the Study:

To assess epithelial barrier function in the ileal pouch mucosa.
To investigate potential functional adaptations in the ileal pouch after surgery.

Main Methods:

Assessed permeability using 51Cr-EDTA in patients with ileal pouch prior to ileostomy closure, functioning pouch, pouchitis, and ulcerative colitis.
Correlated permeability measurements with histological analysis of pouch biopsy specimens, including mucin changes and villous atrophy.

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A Rat Model of Pouchitis Following Proctocolectomy and Ileal Pouch-Anal Anastomosis Using Dextran Sulfate Sodium

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Published on: May 31, 2024

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Published on: February 9, 2016

Functional Assessment of Intestinal Permeability and Neutrophil Transepithelial Migration in Mice using a Standardized Intestinal Loop Model

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A Rat Model of Pouchitis Following Proctocolectomy and Ileal Pouch-Anal Anastomosis Using Dextran Sulfate Sodium

A Rat Model of Pouchitis Following Proctocolectomy and Ileal Pouch-Anal Anastomosis Using Dextran Sulfate Sodium

Published on: May 31, 2024

Main Results:

Mucosal permeability significantly decreased after ileostomy closure (9.4% to 1.4%, p < 0.002).
Reduced permeability correlated with colonic metaplasia markers: mucin changes (p = 0.03) and villous atrophy (p = 0.05).
Pouchitis was associated with significantly increased permeability (5.9%) compared to healthy pouches (1.4%, p < 0.006).

Conclusions:

The mature ileal pouch demonstrates functional adaptation with reduced epithelial permeability.
This adaptation occurs alongside the development of colonic metaplasia, despite chronic inflammation.
Pouchitis represents a state of impaired barrier function in the ileal pouch.