Journal
BARRIERS AND CHANNELS FORMED BY TIGHT JUNCTION PROTEINS II
Volume 1258, Issue -, Pages 143-148Publisher
BLACKWELL SCIENCE PUBL
DOI: 10.1111/j.1749-6632.2012.06631.x
Keywords
microscopic colitis; ENaC; epithelial barrier; ion transport; Th1 cytokine profile
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In this paper, we identify mechanisms of watery diarrhea inmicroscopic colitis (MC). Biopsies from the sigmoid colon of patients with collagenous colitis and treated lymphocytic colitis were analyzed in miniaturized Ussing chambers for electrogenic sodium transport and barrier function with one-path impedance spectroscopy. Cytometric bead arrays (CBA) served to analyze cytokine profiles. In active MC, electrogenic sodium transport was diminished and epithelial resistance decreased. CBA revealed a Th1 cytokine profile featuring increased IFN-gamma, TNF-alpha, and IL-1 beta levels. After four weeks of steroid treatment with budesonide, electrogenic sodium transport recovered while epithelial barrier defects remained. Diarrhea in MC results at least in part from a combination of impaired electrogenic sodium transport and barrier defects. From a therapeutic perspective it can be postulated that the functional importance of loss of ions may be higher than that caused by barrier impairment.
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