Inflammation decreases keratin level in ulcerative colitis; inadequate restoration associates with increased risk of colitis-Associated cancer

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Abstract

Background Keratins are intermediate filament (IF) proteins, which form part of the epithelial cytoskeleton and which have been implicated pathology of inflammatory bowel diseases (IBD). Methods In this study biopsies were obtained from IBD patients grouped by disease duration and subtype into eight categories based on cancer risk and inflammatory status: quiescent recent onset (<5 years) UC (ROUC); UC with primary sclerosing cholangitis; quiescent long-standing pancolitis (20–40 years) (LSPC); active colitis and non-inflamed proximal colonic mucosa; pancolitis with dysplasia-both dysplastic lesions (DT) and distal rectal mucosa (DR); control group without pathology. Alterations in IF protein composition across the groups were determined by quantitative proteomics. Key protein changes were validated by western immunoblotting and immunohistochemical analysis. Result Acute inflammation resulted in reduced K8, K18, K19 and VIM (all p<0.05) compared to controls and non inflamed mucosa; reduced levels of if– a...

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Corfe, B. M., Majumdar, D., Assadsangabi, A., Marsh, A. M. R., Cross, S. S., Connolly, J. B., … Lobo, A. J. (2015). Inflammation decreases keratin level in ulcerative colitis; inadequate restoration associates with increased risk of colitis-Associated cancer. BMJ Open Gastroenterology, 2(1). https://doi.org/10.1136/bmjgast-2014-000024

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