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Clinical and Diagnostic Laboratory Immunology, 03 1996, 219-226, Vol 3, No. 2
B Sendid, JF Colombel, PM Jacquinot, C Faille, J Fruit, A Cortot, D Lucidarme, D Camus and D Poulain
Elevated antibody levels against the yeast Saccharomyces cerevisiae have
been reported in sera from patients with Crohn's disease and not with
ulcerative colitis. The aim of the study was to identify the nature of the
epitopes supporting this antibody response. Whole cells from different S.
cerevisiae strains were selected in immunofluorescence assay for their
ability to differentiate the antibody responses of patients with Crohn's
disease and ulcerative colitis. Their cell wall phosphopeptidomannans were
then tested as antigen in enzyme-linked immunosorbent assay (ELISA) against
sera from 42 patients with Crohn's disease, 20 patients with ulcerative
colitis, and 34 healthy controls. Graded chemical degradations were
performed on the most reactive strain phosphopeptidomannan. The
discriminating epitope was determined through gas-liquid
chromatography-mass spectrometry. The greatest discrimination among
patients with Crohn's disease, ulcerative colitis, and controls was
obtained with Su1, a S. cerevisiae strain used in brewing of beer. ELISA
directed against phosphopeptidomannan of this strain was 64% sensitive and
77% specific for discriminating Crohn's disease versus ulcerative colitis
and 71% sensitive and 89% specific for Crohn's disease versus controls.
Periodate oxidation and selective degradation demonstrated that the most
important polysaccharide epitope was shared by both the acid- stable and
the alkali-labile domains of the phosphopeptidomannan. The determination of
oligomannose sequences of S. cerevisiae Su1 phosphopeptidomannans suggested
that a mannotetraose, Man (1 --> 3)Man(1 --> 2)Man(1 --> 2)Man,
supported the serological response seen in Crohn's disease. Further
identification of the immunogen eliciting this antibody response as a
marker of the disease may help to understand its etiology.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Specific antibody response to oligomannosidic epitopes in Crohn's disease
Laboratoire de Parasitologie-Mycologie, Hopital Huriez, CHRU de Lille, France.
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