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Study of Anti-glycan Antibodies Stability in Saint-Etienne IBD Cohort

2015-07-21 12:23:24 | BioPortfolio

Summary

Prognostic factors in Inflammatory Bowel Diseases (IBD) are currently mainly based on clinical factors (disease extension, perianal involvement, need for surgery, use of immunomodulators…). All of immunological markers (or serological) of IBD have a diagnostic role in indeterminate colitis (ulcerative colitis vs crohn's disease) but they never have been considered as predictors of IBD course in adults. Among the most used, anti-neutrophil cytoplasm antibodies (ANCA) and Anti-Saccaromyces cerevisiae antibodies (ASCA) allow the distinction between ulcerative colitis (ANCA+/ASCA-) and Crohn's disease (ANCA-/ASCA+), and their combined use has a sensitivity and a specificity of about 85%. However, 10 other antibodies have been identified and recently evaluated individually in IBD and especially in pediatric Crohn's disease: anti-ompC, anti-I2, anti-flagellins, anti-glycan (anti-laminaribioside carbohydrate antibodies (ALCA), anti-mannobioside carbohydrate antibodies (AMCA), anti-chitobioside carbohydrate antibody (ACCA), anti-chitin and anti-laminarin), anti-goblet cells and anti-C.albicans specific mannans antibodies. These complementary tests improve the reliability of the diagnosis. In a previous cross-sectional work on a cohort of 195 IBD patients, the investigator showed a prognostic role of some of anti-glycan Abs and especially a correlation with a pejorative form of the disease both in Crohn's disease than in Ulcerative Colitis (UC) and a prediction of corticodependency in IBD.

Description

There is few data on the stability of these antibodies, most of the studies are cross-sectional. There are conflicting results among scarce longitudinal data. One study reported a negativation of anti-glycan antibodies in some cases but not of ASCA or ANCA.

On the cohort of 195 patients included in the first study, the investigator would like to assess at 3 years the immunological profiles of these patients and thus to compare them. In case of modification of the serological status for some antibodies, the search for associated factors (clinical, biological or therapeutic) will be performed. In case of sero-negativation of anti-glycan antibodies, this could be linked with a decrease or a normalization of the increased intestinal permeability in IBD. Indeed, in this subgroup of patients, we will test this hypothesis by analyzing intestinal permeability in anti-glycan positive group on the 2 samples and in the group with a sero-negativation on the second sample.

Study Design

Observational Model: Cohort, Time Perspective: Prospective

Conditions

Crohn's Disease

Intervention

blood specimen

Location

CHU Saint-Etienne
Saint-Etienne
France
42055

Status

Recruiting

Source

Centre Hospitalier Universitaire de Saint Etienne

Results (where available)

View Results

Links

Published on BioPortfolio: 2015-07-21T12:23:24-0400

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Medical and Biotech [MESH] Definitions

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Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.

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