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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kissoon-Singh, Vanessa Moreau, France Trusevych, Elizabeth Chadee, Kris |
| Description | Country affiliation: Canada Author Affiliation: Kissoon-Singh V ( Department of Microbiology, Immunology and Infectious Diseases, Snyder Institute for Chronic Diseases, Gastrointestinal Research Group, University of Calgary Health Sciences Centre, Calgary, Alberta, Canada.) |
| Abstract | Human mucin-2 (MUC-2) is the first line of innate host defense in preventing pathogen-induced epithelial injury. Entamoeba histolytica (Eh) colonizes the mucus layer by binding of the parasite's surface galactose lectin to galactose and N-acetyl-d-galactosamine residues on colonic MUC-2, preventing parasite contact-dependent cytolysis of epithelial cells. We quantified early innate responses to Eh in wild-type and MUC-2-deficient mice (Muc2(-/-)) using closed colonic loops. Eh infection in wild-type but not Muc2(-/-) mice induced a time-dependent increase in (3)H-labeled mucin and nonmucin glycoprotein secretions. Immunohistochemical staining revealed intense MUC-2 secretion, which formed a thick, protective mucus plug overlying the surface epithelium, entrapping Eh. In Muc2(-/-) mice, Eh induced a pronounced time-dependent secretory exudate with increased gross pathology scores and serum albumin leakage. Colonic pathology, secretory responses, and increased proinflammatory cytokine secretions of TNF- , IFN-γ, and IL-13 correlated with altered expression of the tight junction proteins claudin-2, occludin, and ZO-1. We identified the putative Eh virulence factor that elicits the proinflammatory responses and alters tight junction permeability as Eh cysteine protease A5 (EhCP-A5). The present findings demonstrate that colonic mucins confer both luminal and epithelial barrier functions and that, in the absence of MUC-2, mice are more susceptible to Eh-induced secretory and proinflammatory responses mediated by EhCP-A5. |
| File Format | HTM / HTML |
| ISSN | 00029440 |
| Issue Number | 3 |
| Volume Number | 182 |
| e-ISSN | 15252191 |
| Journal | The American Journal of Pathology |
| Language | English |
| Publisher | Elsevier (on behalf of the American Society for Investigative Pathology) |
| Publisher Date | 2013-03-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Blood Cells Research Support, Non-u.s. Gov't Humans Journal Article Tight Junctions Genetics Physiology Colon Goblet Cells Parasitology Inflammation Mediators Intestines Entamoeba Histolytica Secretion Deficiency Mice, Inbred C57bl Gene Expression Regulation Discipline Pathology Epithelial Cells Permeability Metabolism Virulence Factors Mucin-2 Pathogenicity Pathology Animals Tight Junction Proteins Mice |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pathology and Forensic Medicine |
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