Effects of T cell-induced colonic inflammation on epithelial barrier function.

Abstract:

BACKGROUND:Epithelial barrier disturbance is thought to contribute to the pathogenesis of inflammatory bowel diseases; however, it remains unclear whether it is a primary defect participating to the onset of inflammation or only a consequence of sustained inflammation. METHODS:A time course study of epithelial barrier functions and immune mediators was performed in the CD4(+)CD45RB(hi) T cell transfer model of colitis using Ussing chambers. RESULTS:In nonreconstituted severe combined immunodeficiency (SCID) mice, no epithelial dysfunction was observed. However, after transfer of CD4(+)CD45RB(hi) T cells or total CD4(+) T cells, colon of SCID mice displayed a decreased epithelial resistance, even before overt microscopic inflammation had occurred. Sustained colitis of CD4(+)CD45RB(hi) T cell reconstituted mice was also associated with enhanced subepithelial resistance, enhanced paracellular permeability, and decreased net ion transport. All these reflect a disturbance of barrier function and may contribute to diarrhea. Epithelial resistance was positively correlated with interleukin 10 (IL-10) and transforming growth factor beta (TGF-beta) levels and net ion transport inversely correlated with tumor necrosis factor alpha (TNF-alpha) levels, pointing to the protective effect of IL-10 and TGF-beta and to a damaging effect of TNF-alpha. Indomethacin, a nonselective COX inhibitor, decreased epithelial resistance independent of T cells and inflammation, but its effect was more pronounced in inflamed colon. CONCLUSIONS:Induction of colitis by transfer of CD4(+)CD45RB(hi) T cells in SCID mice leads to changes in the colonic epithelium before colitis develops. Decreased epithelium resistance might contribute to the development of colitis; however, it is not sufficient to lead to chronic inflammation.

journal_name

Inflamm Bowel Dis

authors

Suenaert P,Maerten P,Van Assche G,Van Driessche W,Geboes K,Bulteel V,Simaels J,Augustijns P,Ceuppens JL,Rutgeerts P,Perrier C

doi

10.1002/ibd.21211

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

1322-31

issue

8

eissn

1078-0998

issn

1536-4844

journal_volume

16

pub_type

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