Journal
FEMS IMMUNOLOGY AND MEDICAL MICROBIOLOGY
Volume 58, Issue 1, Pages 128-137Publisher
WILEY
DOI: 10.1111/j.1574-695X.2009.00617.x
Keywords
Mycobacterium paratuberculosis; Crohn's disease; seroreactivity; diagnosis
Categories
Funding
- Ministry for Health, Welfare & Family Affairs, Korea [A090184]
- Korea Health Promotion Institute [A090184] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The etiology of Crohn's disease (CD) is unresolved, but it is likely that an interplay of host genetic factors and environmental triggers is relevant. Mycobacterium paratuberculosis (MAP) has been focused upon as one of these triggers because it causes a similar chronic inflammatory bowel disease in animals. However, the differences among MAP antigens isolated from humans (H-MAP) and cattle (B-MAP) have not been well characterized. In this study, culture filtrate (CF) proteins from MAP isolates were tested with sera from CD patients and healthy controls in enzyme-linked immunosorbent assay (ELISA). Antibody produced by seven CD patients reacted differently according to the antigen source: strong reactivity was seen to H-MAP CF, but not to B-MAP CF. Six proteins, ModD, PepA, transaldolase, EchA9, MAP2120c, and MAP2950c, in H-MAP CF reacting specifically with CD patient sera were identified by liquid chromatography-electrospray ionization-MS. Bioinformatic analysis revealed that ModD and PepA were the same proteins reacting with sera from cattle infected with MAP. The elevated antibody responses of CD patients to rModD and rPepA were confirmed by ELISA (P < 0.001). These results support previous studies showing ModD and PepA as key antigens for the diagnosis of MAP infections. The study also identified additional proteins potentially useful in the design of assays for human MAP infections.
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