title: Proteomic analysis of colonic mucosa in a rat model of irritable bowel syndrome.
abstract: Irritable bowel syndrome (IBS) is one of the most common functional disorders of the gastrointestinal tract. It is characterized by abdominal pain and changes in bowel habits. Various studies have investigated the pathophysiologic processes underlying IBS, but the mechanism remains poorly understood. In the present study, we established an IBS model and identified differentially expressed proteins in colon tissue of IBS rats compared with healthy controls by 2-D gel electrophoresis, MALDI-TOF-MS, and Western blot analysis. Our results showed that 13 of the 1396 protein spots on 2-D gel were differently expressed between the IBS and control groups. Ontological analysis of these proteins revealed primary roles in catalytic activity (protein disulfide-isomerase A3, glyoxalase I, cathepsin S, alpha-enolase), structural support (cytokeratin 8), antioxidant activity (peroxiredoxin-6), protein binding (transgelin, serpin peptidase inhibitor B5), and signal transduction (40S ribosomal protein SA). Protein disulfide-isomerase A3 and cytokeratin 8 overexpression in IBS were confirmed by Western blot. The findings indicate that multiple proteins are involved in IBS processes that influence intestinal tract immunity, inflammation, and nerve regulation. Our study provides useful candidate genes and proteins for further investigation.
authors.affiliation: Department of Gastroenterology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, P R China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Ding
authors.forename: Bin
authors.initials: B
authors.lastname: Lu
authors.forename: Dongbo
authors.initials: D
authors.lastname: Chen
authors.forename: Lina
authors.initials: L
authors.lastname: Meng
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Shuo
authors.initials: S
authors.lastname: Chen
mesh_terms: D000818:Animals; D015153:Blotting, Western; D004195:Disease Models, Animal; D007413:Intestinal Mucosa / Q000378:metabolism*; D043183:Irritable Bowel Syndrome / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism; D040901:Proteomics / Q000379:methods*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D013347:Subcellular Fractions / Q000378:metabolism
chemical_list: D011506:Proteins