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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Lack of association among TNF-alpha gene expression,-308 polymorphism (G > A) and virulence markers of Helicobacter pylori

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Zabaglia, Luanna Munhoz [1] ; Ferraz, Mariane Avante [1] ; Pereira, Weendelly Nayara [1] ; Orcini, Wilson Aparecido [1] ; de Labio, Roger Willian [2] ; Neto, Agostinho Caleman [2] ; Wisnieski, Fernanda [3] ; de Oliveira, Juliana Garcia [1] ; Cardoso Smith, Marilia de Arruda [3] ; Marques Payao, Spencer Luiz [1, 2] ; Rasmussen, Lucas Trevizani [1]
Total Authors: 11
[1] Univ Sagrado Coracao, BR-17011160 Bauru, SP - Brazil
[2] Fac Med Marilia, BR-17519050 Marilia, SP - Brazil
[3] Univ Fed Sao Paulo, BR-04021001 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Venomous Animals and Toxins including Tropical Diseases; v. 21, DEC 30 2015.
Web of Science Citations: 4

Background: Tumor necrosis factor plays a critical role in the pathogenesis of gastric diseases such as gastric cancer, and an abnormal inflammatory response has frequently been observed in dyspeptic patients. Helicobacter pylori infection can induce a gastric mucosal inflammatory response that may be influenced by -308 (G > A) polymorphisms and gene expression of the TNF-alpha gene. Methods: One hundred and thirty-four gastric biopsy samples were collected from patients of both genders (61 male and 73 female, mean age 40.3 +/- 24.2 years) with gastric symptoms. The -308 (G > A) polymorphism of TNF-alpha was characterized using polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP). The expression level was measured using real-time PCR, and relative quantification (RQ) was calculated using the comparative CT method (2(Delta Delta CT)). Results: The analysis revealed an increase in TNF-alpha gene expression in patients with gastritis; on the other hand, no statistical differences were observed in patients with gastric cancer. In addition, no association was found among -308 polymorphism genotypes, virulence markers, or TNF-alpha gene expression. Conclusions: Helicobacter pylori induces a large increase in TNF-alpha expression in patients with gastritis, regardless of tissue inflammation, but after the tissue becomes neoplastic, the presence of bacteria did not influence expression. These results suggest that the TNF-alpha pathway may play an important role in the progression from gastritis to gastric cancer (AU)

FAPESP's process: 13/21224-4 - Genotyping and Gene Expression Analysis of TNF-Alpha in samples from patients with gastric disease: A Possible relationship with Helicobacter pylori.
Grantee:Luanna Munhoz Zabaglia
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 12/18333-3 - Characterization of virulence factor dupA, of Helicobacter pylori, genotyping and analysis of the expression of genes of tumor necrosis factor and E-cadherin in samples of children and adults with symptoms peptides
Grantee:Lucas Trevizani Rasmussen
Support type: Regular Research Grants
FAPESP's process: 13/21285-3 - Characterization of dupA gene of Helicobacter pylori and gene expression analysis of E-Caderin gene in gastric biopses samples from dyspeptic patients and gastric cancer.
Grantee:Mariane Avante Ferraz
Support type: Scholarships in Brazil - Scientific Initiation