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Increased colonic permeability in patients with ulcerative colitis: an in vitro study
P Nejdfors1, Q Wang, M Ekelund
1Dept. of Animal Physiology, Lund University, Sweden.
Scandinavian Journal of Gastroenterology
|August 26, 1998
Summary
Patients with ulcerative colitis show increased colonic permeability, indicating a compromised gut barrier. This heightened permeability, especially in acute colitis, may allow harmful substances to cross the intestinal lining.
Area of Science:
- Gastroenterology
- Immunology
- Cell Biology
Background:
- Investigated colonic permeability in patients with ulcerative colitis versus cancer controls.
- Utilized in vitro study design with colonic tissue samples.
Purpose of the Study:
- To quantify and compare colonic mucosal permeability between ulcerative colitis patients and healthy controls.
- To explore the relationship between inflammation and colonic barrier function.
Main Methods:
- Employed Ussing diffusion chambers to assess in vitro colonic permeability.
- Measured the passage of marker molecules (14C-mannitol, ovalbumin) across the colonic mucosa.
- Analyzed fresh colonic segments from colectomy and resection patients.
Main Results:
- Significantly increased marker molecule passage in ulcerative colitis patients compared to controls.
- Further elevation of permeability observed in patients with acute colitis.
- Inflammation and loss of mucosal integrity likely explain increased permeability.
Conclusions:
- Ulcerative colitis is associated with a compromised colonic barrier and increased mucosal permeability.
- Both chronic and acute colitis demonstrate a derangement of the intestinal barrier.
- Increased permeability suggests potential passage of luminal macromolecules like bacterial products.