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Epithelial permeability to proteins in the noninflamed ileum of Crohn's disease?
Linköping University, Department of Biomedicine and Surgery, Surgery. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Molecular and Clinical Medicine, Medical Microbiology. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Biomedicine and Surgery, Surgery. Linköping University, Faculty of Health Sciences.
Department of Pathology, Lund University–MAS, Malmö.
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1999 (English)In: Gastroenterology, ISSN 0016-5085, Vol. 117, no 1, 65-72 p.Article in journal (Refereed) Published
Abstract [en]

Background & Aims: Crohn's disease (CD) is associated with a disturbed intestinal barrier. Permeability studies have focused on inert molecules, but little is known about transepithelial transport of macromolecules with antigenic potential in humans. The aim of this study was to quantify permeation and to characterize passage routes for macromolecules in ileal mucosa in CD.

Methods: Noninflamed and inflamed ileal mucosa specimens from patients with CD (n = 12) and ileal specimens from patients with colon cancer (n = 7) were studied regarding transmucosal permeation of ovalbumin, dextran (mol wt, 40,000), and 51Cr-EDTA for 90 minutes in vitro in Ussing chambers. Transepithelial passage routes for fluorescent ovalbumin and dextran 40,000 were investigated by confocal microscopy.

Results: Noninflamed ileum from CD patients showed increased permeation of ovalbumin compared with ileum from colon cancer patients (P < 0.05). Dextran permeation was equal in the three groups, whereas 51Cr-EDTA permeability was increased in inflamed ileum. Ovalbumin passed both transcellularly and paracellularly, but dextran followed a strictly paracellular route. Both markers were subsequently endocytosed by cells of the lamina propria.

Conclusions: Noninflamed ileal mucosa from patients with CD shows increased epithelial permeability to ovalbumin, probably by augmented transcytosis. This increase in antigen load to the lamina propria could be an initiating pathogenic event in CD.

Place, publisher, year, edition, pages
1999. Vol. 117, no 1, 65-72 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-25306DOI: 10.1016/S0016-5085(99)70551-2Local ID: 9747OAI: oai:DiVA.org:liu-25306DiVA: diva2:245634
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2012-11-22

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Söderholm, Johan DHolmgren Peterson, KajsaOlaison, GunnarMagnusson, Karl-EricSjödahl, Rune

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