Faculty Collaboration Database

Role of MutS homolog 2 (MSH2) in intestinal myofibroblast proliferation during Crohn's disease stricture formation. Am J Physiol Gastrointest Liver Physiol 2008 Sep;295(3):G581-90

Date

07/19/2008

Pubmed ID

18635600

Pubmed Central ID

PMC2536780

DOI

10.1152/ajpgi.90311.2008

Scopus ID

2-s2.0-53449102437 (requires institutional sign-in at Scopus site)   9 Citations

Abstract

Tissue remodeling and mesenchymal cell accumulation accompanies chronic inflammatory disorders involving joints, lung, vasculature, and bowel. Chronic inflammation may alter DNA-mismatch repair (MMR) systems in mesenchymal cells, but is not defined in Crohn's disease (CD) and its associated intestinal remodeling and stricture formation. We determined whether DNA-MMR alteration plays a role in the pathogenesis of CD tissue remodeling. Control and CD bowel tissues were used to generate primary cultures of muscularis mucosa myofibroblasts, which were assessed directly or following stimulation with TNF-alpha/LPS or H2O2. MutS homolog (MSH)2, MSH3, and MSH6 expression in tissues and myofibroblasts was determined. Immunohistochemical staining revealed an increased expression of MSH2 in CD muscularis mucosa and submucosal tissues compared with controls or uninvolved CD tissue, and MSH2 expression was increased in CD myofibroblasts compared with control cells. TNF-alpha/LPS and H2O2 further enhanced MSH2 expression in both control and CD cells, which were decreased by simvastatin. There were no significant changes in MSH3 and MSH6 expression. Proliferating cell nuclear antigen and Ki67 staining of CD tissue revealed increased proliferation in the muscularis mucosa and submucosa of chronically inflamed tissues, and enhanced proliferation was seen in CD myofibroblasts compared with controls. Simvastatin reversed the effects of inflammatory stress on the DNA-MMR and inhibited proliferation of control and CD myofibroblasts. Gene silencing with MSH2 siRNA selectively decreased CD myofibroblast proliferation. These data demonstrate a potential role for MSH2 in the pathogenesis of nonneoplastic mesenchymal cell accumulation and intestinal remodeling in CD chronic inflammation.

Author List

Floer M, Binion DG, Nelson VM, Manley S, Wellner M, Sadeghi S, Behmaram B, Sewell C, Otterson MF, Kucharzik T, Rafiee P

Author

Mary F. Otterson MD Professor in the Surgery department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adult
Cell Proliferation
Cells, Cultured
Crohn Disease
DNA-Binding Proteins
Female
Fibroblasts
Fluorescent Antibody Technique
Humans
Hydrogen Peroxide
Hydroxymethylglutaryl-CoA Reductase Inhibitors
Immunohistochemistry
Intestinal Obstruction
Intestines
Lipopolysaccharides
Male
Microsatellite Instability
Middle Aged
MutS Homolog 2 Protein
MutS Homolog 3 Protein
Proliferating Cell Nuclear Antigen
RNA Interference
RNA, Messenger
RNA, Small Interfering
Simvastatin
Thymidine
Tumor Necrosis Factor-alpha
Up-Regulation