Data/hora: 10/06/2024 03:40:58

Provedor de dados: 	80	
País: 	Brazil	
Título: 	Lack of association among TNF-α gene expression, -308 polymorphism (G &amp;gt; A) and virulence markers of Helicobacter pylori	
Autores: 	Zabaglia,Luanna Munhoz; Ferraz,Mariane Avante; Pereira,Weendelly Nayara; Orcini,Wilson Aparecido; Labio,Roger Willian de; Caleman Neto,Agostinho; Wisnieski,Fernanda; Oliveira,Juliana Garcia de; Smith,Marilia de Arruda Cardoso; Payão,Spencer Luiz Marques; Rasmussen,Lucas Trevizani.	
Data: 	2015-01-01	
Ano: 	2015	
Palavras-chave: 	H. pylori; TNF-α Gene expression; Gastric cancer cagA.	
Resumo: 	Abstract  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 &gt; A) polymorphisms and gene expression of theTNF-α gene.  Methods  One hundred and thirty-four gastric biopsy samples were collected from patients of both genders (61♂ and 73♀, mean age 40.3 ± 24.2 years) with gastric symptoms. The -308 (G &gt; A) polymorphism of TNF-α 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-ΔΔCT).  Results  The analysis revealed an increase in TNF-α 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-α gene expression.  Conclusions Helicobacter pylori induces a large increase in TNF-α 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-α pathway may play an important role in the progression from gastritis to gastric cancer	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100355	
Editor: 	Centro de Estudos de Venenos e Animais Peçonhentos	
Relação: 	10.1186/s40409-015-0054-3	
Formato: 	text/html	
Fonte: 	Journal of Venomous Animals and Toxins including Tropical Diseases  v.21 2015	
Fonte: 	info:eu-repo/semantics/openAccess