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Helicobacter pylori in dental plaque and stomach of patients from Northern Brazil

World Journal of Gastroenterology 2010年第24期16卷 3033-3039页

作者： mnica baraúna assumpo.luisa caricio.martins Hivana Patricia melo Barbosa Katarine Antonia dos Santos Barile Sintia Silva de Almeida Paulo Pimentel assumpo Tereza Cristina de oliveira Corvelo Endoscopy Department Joo de Barros Barreto University Hospital Immunopathology Laboratory Nucleus of Tropical Medicine Federal University of Pará Immunogenetics Laboratory Federal University of Pará Paulo Pimentel assumpo Surgery Department Joo de Bar-ros Barreto University Hospital

AIm: To establish whether virulence factor genes vacA and cagA are present in Helicobacter pylori (H. pylori) retrieved from gastric mucosa and dental plaque in pa-tients with dyspepsia. mETHoDS: Cumulative dental plaque specimens and gastric biopsies were submitted to histological exami-nation, rapid urease test and polymerase chain reac-tion (PCR) assays to detect the presence of cagA and vacA ***: Detection of H. pylori from dental plaque and gastric biopsy samples was greater by PCR com-pared to histological examination and the rapid ure-ase test. Dna from H. pylori was detected in 96% of gastric mucosa samples and in 72% of dental plaque samples. Sixty-three (89%) of 71 dental plaque sam-ples that were H. pylori-positive also exhibited identical vacA and cagA genotypes in gastric mucosa. The most common genotype was vacAs1bm1 and cagA positive, either in dental plaque or gastric mucosa. These viru-lent H. pylori isolates were involved in the severity of clinical ***: These pathogenic strains were found simultaneously in dental plaque and gastric mucosa, which suggests that gastric infection is correlated with the presence of H. pylori in the mouth.

关键词： Helicobacter pylori Gastric mucosa Dental plaque cagA vacA

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Interleukin-1 and TNF-α polymorphisms and Helicobacter pylori in a Brazilian Amazon population

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World Journal of Gastroenterology 2009年第12期15卷 1465-1471页

作者： Hivana Patricia melo Barbosa luisa caricio.martins Sidney Emanuel Batista dos Santos Samia Demachki mnica baraúna assumpo Charliana Damasceno Arago Tereza Cristina de oliveira Corvelo Laboratory of Immunogenetics Federal University of Pará66075-110BelémBrazil Nucleus of Tropical medicine Federal University of Pará66055-240BelémBrazil Laboratory of Human and medical Genetics Federal University of Pará66075-110BelémBrazil Department of Pathology Joo de Barros Barreto Universitary HospitalFederal University of Pará66073-000BelémBrazil Department of Endoscopy Joo de Barros Barreto Universitary HospitalFederal University of Pará66073-000BelémBrazil

AIm： To study the association between Interleukin-1 （IL-1） and tumor necrosis factor （TNF）-α polymorphisms, infection by Helicobacter pylori （H pylori） and the development of gastrointestinal diseases.mETHoDS： Genomic Dna was extracted from the peripheral blood of 177 patients with various gastrointestinal diseases and from 100 healthy volunteers. The polymorphisms in IL-1β and TNF-α genes were analyzed using the polymerase chain reactionrestriction fragment length polymorphism method （PCRRFLP） and those from IL-1RN with PCR. The presence of infection due to H pylori and the presence of the CagA toxin were detected by serology. The histopathological parameters in the gastric biopsies of the patients were according to the Sydney classification.RESULTS： A comparison of the frequencies of the different polymorphisms studied among the patients and the control group demonstrated that the allele IL- 1RN＊2 was more frequent among patients with gastric ulcers and adenocarcinoma. Carriers of the allele IL- RN＊2 and those with reactive serology for anti-CagA IgG had a greater risk of developing peptic ulcer and gastric adenocarcinoma, as well as a higher degree of inflammation and neutrophilic activity in the gastricCoNCLUSIoN： our results indicate a positive association between IL-1RN gene polymorphism and infection by positive H pylori CagA strains and the development of gastric ulcers and adenocarcinoma.

关键词： Helicobacter pylori Interleukin 1β gene Interleukin-1 receptor antagonist gene TNF-α gene Cag pathogenicity island

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