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Title in Portuguese: Differential expression of MYC in H. pylori-related intestinal
Author: Fernandes, Isabelle Joyce de Lima Silva
Alves, Markênia Kélia Santos
Lima, Valeska Portela
Lima, Marcos Antônio Pereira de
Barros, Marcos Aurélio Pessoa
Rabenhorst, Silvia Helena Barem
Ferreira, Márcia Valéria Pitombeira
Keywords: Neoplasias Gástricas
Helicobacter pylori
Issue Date: May-2011
Publisher: Virchows Arch
Citation: FERNANDES, I. J. L S. et al. Differential expression of MYC in H. pylori-related intestinal and diffuse gastric tumors. Virchows Arch, v. 458, n. 6, p. 725–731, maio, 2011.
Abstract: Evidence suggests that the carcinogenic process guided by Helicobacter pylori is related to the expression of cell cycle and apoptosis proteins as BCL-2, BAX, and MYC. However, the literature is conflicting regarding the expression frequency in the histological subtypes and did not consider cagA gene presence. To investigate the expression of these proteins considering the histological subtypes of gastric cancer associated with H. pylori (cagA), a total of 89 cases were used. H. pylori infection and cagA status were determined by PCR. Immunodetection was performed for MYC, BCL-2, and BAX proteins. H. pylori was found in 95.5% of the patients, among them, 65.8% were cagA(+). Nuclear MYC was detected in 36.4%, BAX in 55.7%, while BCl-2 in just 5%. Nuclear MYC staining was significantly lower in the intestinal than diffuse subtype (p=0.008) and was related with the presence of H. pylori cagA(+). Additionally, most of the few cases cytoplasmic MYC positive were in the intestinal subtype. In diffuse tumors, although most nuclear MYC positive cases were cagA(+), it was not significant. No difference was observed between BCL-2 or BAX expression considering the presence of cagA gene in the histological subtypes. It seems that MYC could be relevant for the diffuse tumorigenic pathway associated with H. pylori and possibly influenced by the presence of cagA gene, while in intestinal tumors, the tumorigenic pathway does not occur through the MYC expression.
ISSN: 0945-6317
Appears in Collections:DMC - Artigos publicados em revistas científicas

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