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Intracellular and interstitial expression of Helicobacter pylori virulence genes in gastric precancerous intestinal metaplasia and adenocarcinoma

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Author

  • C Semino-Mora
  • SQ Doi
  • A Marty
  • V Simko
  • Ingemar Carlstedt
  • A Dubois

Summary, in English

Gastric intestinal metaplasia (IM) and gastric cancer are associated with Helicobacter pylori, but the bacterium often is undetectable in these lesions. To unravel this apparent paradox, IM, H. pylori presence, and the expression of H. pylori virulence genes were quantified concurrently using histologic testing, in situ hybridization, and immunohistochemistry. H. pylori was detected inside metaplastic, dysplastic, and neoplastic epithelial cells, and cagA and babA2 expression was colocalized. Importantly, expression of cagA was significantly higher in patients with IM and adenocarcinoma than in control subjects. The preneoplastic "acidic" MUC2 mucin was detected only in the presence of H. pylori, and MUC2 expression was higher in patients with IM, dysplasia, and cancer. These novel findings are compatible with the hypothesis that all stages of gastric carcinogenesis are fostered by persistent intracellular expression of H. pylori virulence genes, especially cagA inside MUC2-producing precancerous gastric cells and pleomorphic cancer cells.

Publishing year

2003

Language

English

Pages

1165-1177

Publication/Series

Journal of Infectious Diseases

Volume

187

Issue

8

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Infectious Medicine

Status

Published

ISBN/ISSN/Other

  • ISSN: 1537-6613