Unique dietary-related mouse model of colitis.

Abstract:

BACKGROUND:A high-fat diet is a risk factor for the development of inflammatory bowel disease (IBD) in humans. Deoxycholate (DOC) is increased in the colonic contents in response to a high-fat diet. Thus, an elevated level of DOC in the colonic lumen may play a role in the natural course of development of IBD. METHODS:Wild-type B6.129 mice were fed an AIN-93G diet, either supplemented with 0.2% DOC or unsupplemented and sacrificed at 1 week, 1 month, 3 months, 4 months, and 8 months. Colon samples were assessed by histopathological, immunohistochemical, and cDNA microarray analyses. RESULTS:Mice fed the DOC-supplemented diet developed focal areas of colonic inflammation associated with increases in angiogenesis, nitrosative stress, DNA/RNA damage, and proliferation. Genes that play a central role in inflammation and angiogenesis and other related processes such as epithelial barrier function, oxidative stress, apoptosis, cell proliferation/cell cycle/DNA repair, membrane transport, and the ubiquitin-proteasome pathway showed altered expression in the DOC-fed mice compared with the control mice. Changes in expression of individual genes (increases or reductions) correlated over time. These changes were greatest 1 month after the start of DOC feeding. CONCLUSIONS:The results suggest that exposure of the colonic mucosa to DOC may be a key etiologic factor in IBD. The DOC-fed mouse model may reflect the natural course of development of colitis/IBD in humans, and thus may be useful for determining new preventive strategies and lifestyle changes in affected individuals.

journal_name

Inflamm Bowel Dis

authors

Bernstein H,Holubec H,Bernstein C,Ignatenko N,Gerner E,Dvorak K,Besselsen D,Ramsey L,Dall'Agnol M,Blohm-Mangone KA,Padilla-Torres J,Cui H,Garewal H,Payne CM

doi

10.1097/01.MIB.0000209789.14114.63

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

278-93

issue

4

eissn

1078-0998

issn

1536-4844

pii

00054725-200604000-00005

journal_volume

12

pub_type

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