Altered tight junction structure contributes to the impaired epithelial barrier function in ulcerative colitis.

Abstract:

BACKGROUND & AIMS:Mechanisms of diarrhea in ulcerative colitis (UC) are still unknown. Functional and structural characterization of epithelial barrier and transport properties in ulcerative colitis (UC) was performed. METHODS:Inflamed sigmoid colon epithelium from UC patients was studied by alternating current impedance analysis to determine the pure epithelial resistance as a measure of intestinal barrier function. Tight junction (TJ) structure was investigated by freeze-fracture electron microscopy. RESULTS:Although total wall resistance was reduced in UC by 50%, impedance analysis uncovered a much more pronounced barrier defect. Epithelial resistance decreased from 95 +/- 5 to 20 +/- 3 omega3. cm2, which in conventional analysis is masked by an increase in subepithelial resistance from 14 +/- 1 to 36 +/- 3 omega3. cm2 caused by inflammation. This was paralleled by a change in epithelial cell TJ structure in UC. Strand count decreased from 6.94 +/- 0.25 to 4.76 +/- 0.47 at the surface and from 7.26 +/- 0.31 to 5.46 +/- 0.37 in the crypts. CONCLUSIONS:The inflamed colonic mucosa in UC has an impaired barrier function that is much more pronounced than previously assumed. An altered TJ structure contributes to this barrier defect which, because of increased back leak, can reduce net ion transport. Thus, a leak-flux mechanism contributes to the diarrhea in UC.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Schmitz H,Barmeyer C,Fromm M,Runkel N,Foss HD,Bentzel CJ,Riecken EO,Schulzke JD

doi

10.1016/s0016-5085(99)70126-5

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

301-9

issue

2

eissn

0016-5085

issn

1528-0012

pii

S0016508599001390

journal_volume

116

pub_type

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