期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 286, 期 34, 页码 29964-29972出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M111.263715
关键词
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资金
- National Institutes of Health [RO1 DK63041, R21 AI078237, R21 AI088337, T53 1007646, D43TW006581]
- Japanese Government (Ministry of Education, Culture, Sports, Science, and Technology) [23000012, 20229006, 23390102, 18073003]
- Grants-in-Aid for Scientific Research [22790403, 23390102, 18073003, 20229006, 23510254, 23590518, 23000012] Funding Source: KAKEN
Population genetic analyses of bacterial genes whose products interact with host tissues can give new understanding of infection and disease processes. Here we show that strains of the genetically diverse gastric pathogen Helicobacter pylori from Amerindians from the remote Peruvian Amazon contain novel alleles of cagA, a major virulence gene, and reveal distinctive properties of their encoded CagA proteins. CagA is injected into the gastric epithelium where it hijacks pleiotropic signaling pathways, helps Hp exploit its special gastric mucosal niche, and affects the risk that infection will result in overt gastroduodenal diseases including gastric cancer. The Amerindian CagA proteins contain unusual but functional tyrosine phosphorylation motifs and attenuated CRPIA motifs, which affect gastric epithelial proliferation, inflammation, and bacterial pathogenesis. Amerindian CagA proteins induced less production of IL-8 and cancer-associated Mucin 2 than did those of prototype Western or East Asian strains and behaved as dominant negative inhibitors of action of prototype CagA during mixed infection of Mongolian gerbils. We suggest that Amerindian cagA is of relatively low virulence, that this may have been selected in ancestral strains during infection of the people who migrated from Asia into the Americas many thousands of years ago, and that such attenuated CagA proteins could be useful therapeutically.
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