Variation in the number of EPIYA-C repeats in CagA protein from Colombian Helicobacter pylori strains and its ability to induce hummingbird phenotype in gastric epithelial cells

被引:14
作者
Javier Quiroga, Andres [1 ,2 ]
Huertas, Antonio [2 ]
Lucia Combita, Alba [1 ,2 ]
Mercedes Bravo, Maria [1 ,2 ]
机构
[1] Inst Nacl Cancerol, Grp Invest Agentes Infecciosos & Canc, Bogota, DC, Colombia
[2] Inst Nacl Cancerol, Grp Invest Biol Canc, Bogota, DC, Colombia
来源
BIOMEDICA | 2010年 / 30卷 / 02期
关键词
Helicobacter pylori; polymorphism; genetic; gastritis; stomach neoplasm; duodenal ulcer; PATHOGENICITY ISLAND; TYROSINE PHOSPHORYLATION; GASTRODUODENAL DISEASE; BIOLOGICAL-ACTIVITY; GENE POLYMORPHISMS; CANCER RISK; 3' REGION; VIRULENCE; INFECTION; TRANSLOCATION;
D O I
10.7705/biomedica.v30i2.188
中图分类号
R188.11 [热带医学];
学科分类号
摘要
Introduction. Studies using Western Helicobacter pylori strains have shown that a risk factor for gastric cancer is the number of EPIYA-C motifs in the cytotoxin-associated A protein. CagA is delivered into epithelial cells, where it becomes tyrosine phosphorylated in their EPIYA repeats and induces cytoskeleton rearrangements. Objectives. The objective of this study was to evaluate H. pylori cagA positive strains isolated from Colombian patients with gastroduodenal diseases for the number of EPIYA-C repeats in cagA and their ability to induce cytoskeleton rearrangements in epithelial cells. Materials and methods. We analyzed the 3' EPIYA repeats region of cagA by PCR in 93 H. pylori cagA positive strains from 49 patients with gastritis, 17 with gastric cancer, and 24 with duodenal ulcer. AGS cells exposed to the various H. pylori isolates were evaluated for rearrangements in their cytoskeleton. Results. Strains with one EPIYA-C were the most frequent in gastritis and duodenal ulcer patients. Strains with three EPIYA-C were mainly found in gastric cancer. We found a significantly higher risk of gastric cancer for individuals infected with strains harboring three EPIYA-C motifs (OR=12.4, CI95%; 2.32-66.3). Strains from gastric cancer showed significantly higher percentages of induction of cytoskeleton rearrangements in comparison with those from gastritis (p Mann-Whitney<0.005). Conclusions. H. pylon strains with three EPIYA-C repeats can confer an increased risk of cancer to infected individuals.
引用
收藏
页码:251 / 258
页数:8
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