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Gastroenterology. 2003 Sep;125(3):795-804.

Stress-induced disruption of colonic epithelial barrier: role of interferon-gamma and myosin light chain kinase in mice.

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  • 1Neuro-Gastroenterology and Nutrition Unit, Institut National de la Recherche Agronomique, Toulouse, France.

Abstract

BACKGROUND & AIMS:

Stressful life events are supposed to be involved in various diseases such as inflammatory bowel diseases and irritable bowel syndrome. Impairment of the intestinal epithelial barrier function is a suspected consequence of stress, but the underlying mechanisms remain unclear. This study aimed to determine the mechanisms through which stress modulates the colonic epithelial barrier.

METHODS:

Cytokine messenger RNA (mRNA) expression was evaluated in murine colon, liver, and spleen by competitive reverse-transcription polymerase chain reaction after 1-4 days of daily 2-hour stress sessions. Colonic paracellular permeability was measured as the in vivo lumen-to-blood ratio of (51)Cr-ethylenediaminetetraacetic acid. The effect of a myosin light chain (MLC) kinase inhibitor (ML-7) was assessed on stress-induced interferon (IFN)-gamma mRNA expression and colonic epithelial barrier impairment, and MLC phosphorylation was determined by immunoblot. Finally, the incidence of repeated stress sessions on bacterial translocation was determined.

RESULTS:

Repeated stress induced an overexpression of colonic IFN-gamma. In the liver, higher levels of IFN-gamma, interleukin (IL)-4, and IL-10 mRNAs were detected and were associated with bacterial translocation, inflammation, and apoptosis. Stress increased colonic permeability of control mice, but not of SCID and IFN-gamma-deficient mice. ML-7 inhibited the stress-induced increased permeability, bacterial translocation, and cytokine overexpression in the liver and restored a normal histology. Larger amounts of phosphorylated MLC were detected in stressed animals.

CONCLUSIONS:

Repeated stress sessions drive organ-specific cytokine expression patterns and alter colonic mucosal barrier functions associated with bacterial translocation. This effect depends on the presence of CD4(+) T cells and requires IFN-gamma production and MLC phosphorylation.

PMID:
12949725
[PubMed - indexed for MEDLINE]
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