Infection with Specific Helicobacter pylori-cag Pathogenicity Island Strains Is Associated with Interleukin-1B Gene Polymorphisms in Venezuelan Chronic Gastritis Patients
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Miguel Angel Chiurillo Yeinmy H. Moran Miryan Can˜as Elvis J. Valderrama Emma Armanie
- چاپ و سال / کشور: 2010
Description
Background The cag pathogenicity island (cag-PAI) is one of the major virulence factors of Helicobacter pylori, showing considerable geographic variation. Aim We investigated the prevalence of cagA, cagE, and cagT genes of cag-PAI and their association with proinflammatory IL-1B-511/-31/?3954 polymorphisms in Venezuelan chronic gastritis patients from a high-risk gastric cancer region. Methods Presence of cag-PAI genes and IL-1B polymorphisms in 121 biopsy specimens was evaluated by polymerase chain reaction (PCR) and PCR–restriction fragment length polymorphism (RFLP), respectively. Results cagA? and triple-positive (cagAET?) strains were detected in 79.3% and 70.2% of patients, respectively. We found that infection with cagA? and cagAET? strains was associated (P\0.05) with hosts harboring both IL-1B ?3954C allele and IL-1B-511T/-31C/?3954C haplotype (TCC?). The frequency of gastric atrophy was significantly higher (P\0.020) among cagAET?/IL-1B-TCC? combined genotype carriers. Conclusion Carriage of IL-1B ?3954C allele and IL-1BTCC ? haplotype could favor colonization of bacterial cagAET? strains, and the combination of these bacterial and host haplotypes could play a synergistic role in development of premalignant gastric lesions. This work contributes to understanding of the complex interaction between H. pylori virulence factors and cytokine genotypes involved in gastrointestinal diseases.
Dig Dis Sci (2011) 56:449–456 DOI 10.1007/s10620-010-1316-0 Received: 25 April 2010 / Accepted: 14 June 2010 / Published online: 29 June 2010
