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Research

Duodenal Ulcer-related Antigens from Helicobacter pylori

Immunoproteome and Protein Microarray Approaches^*,S

Yu-Fen Lin, Chun-Yi Chen, Mong-Hsun Tsai, Ming-Shiang Wu^¶,||, Yu-Chun Wang^**, Eric Y. Chuang, Jaw-Town Lin^¶,||, Pan-Chyr Yang^¶ and Lu-Ping Chow^,,¶¶

From the Graduate Institute of Biochemistry and Molecular Biology and ^|| Department of Primary Care Medicine, College of Medicine, National Taiwan University, Taipei 10051, Taiwan, Institute of Biotechnology, College of Bio-Resources and Agriculture and Department of Electrical Engineering, College of Electrical Engineering and Computer Science, National Taiwan University, Taipei 10617, Taiwan, Departments of ^¶ Internal Medicine and Medical Genetics, National Taiwan University Hospital, Taipei 10048, Taiwan, and ^** Institute of Environmental Health, College of Public Health, National Taiwan University, Taipei 10055, Taiwan

Helicobacter pylori is an important risk factor of duodenal ulcer (DU). Although many virulence factors of H. pylori have been identified, few have been reported to show an association with the pathogenesis of DU. The aims of this study were to identify H. pylori antigens showing a high seropositivity in DU and to develop a platform for rapid and easy diagnosis for DU. Because DU and gastric cancer (GC) are considered clinical divergent gastroduodenal diseases, we compared two-dimensional immunoblots of an acid-glycine extract of an H. pylori strain from a patient with DU probed with serum samples from 10 patients with DU and 10 with GC to identify DU-related antigens. Of the 11 proteins that were strongly recognized by serum IgG from DU patients, translation elongation factor EF-G (FusA), catalase (KatA), and urease subunit (UreA) were identified as DU-related antigens, showing a higher seropositivity in DU samples (n = 124) than in GC samples (n = 95) (FusA, 70.2 versus 45.3%; KatA, 50.8 versus 41.1%; UreA, 44.4 versus 27.4%). In addition, we found that the use of multiple antigens improved the discrimination between patients with DU and those with GC as the odds ratios increased from 1.82 (95% confidence interval (CI), 0.79–4.21; p = 0.1607) for seropositivity for FusA, KatA, or UreA alone to 4.95 (95% CI, 2.05–12.0; p = 0.0004) for two of the three antigens and to 5.71 (95% CI, 1.86–17.6; p = 0.0024) for all three antigens. Moreover a protein array containing the three DU-related antigens was developed to test the idea of using multiple biomarkers in diagnosis. We conclude that FusA, KatA, and UreA are DU-related antigens of H. pylori, and the combination of these on a protein array provided a rapid and convenient method for detecting serum antibody patterns of DU patients.

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