Up-regulation of Tumor Necrosis Factor-α Pathway Survival Genes and of the Receptor TNFR2 in Gastric Cancer

Overview

Journal World J Gastrointest Oncol

Publisher Baishideng Publishing Group

Date 2019 May 2

PMID 31040894

Citations 11

Authors

Ana Flavia Teixeira Rossi

Julia Cocenzo Contiero

Fernanda da Silva Manoel-Caetano

Fabio Eduardo Severino

Ana Elizabete Silva

Affiliations

Soon will be listed here.

Abstract

Background: Gastric carcinogenesis can be induced by chronic inflammation triggered by () infection. Tumor necrosis factor (TNF)-α and its receptors (TNFR1 and TNFR2) regulate important cellular processes, such as apoptosis and cell survival, and the disruption of which can lead to cancer. This signaling pathway is also modulated by microRNAs (miRNAs), altering gene expression.

Aim: To evaluate the mRNA and miRNAs expression involved in the TNF-α signaling pathway in gastric cancer (GC) tissues and its relationship.

Methods: Quantitative polymerase chain reaction (qPCR) by TaqMan assay was used to quantify the RNA transcript levels of TNF-α signaling pathway (, and miRNAs that targets genes from this pathway (miR-19a, miR-34a, miR-103a, miR-130a, miR-181c) in 30 GC fresh tissue samples. Molecular diagnosis of was performed by nested PCR for gene . A miRNA:mRNA interaction network was construct using Cytoscape v3.1.1 from the analysis performed using public databases.

Results: Up-regulation of cellular survival genes as , , and , besides and miR-34a was observed in GC tissues, whereas mediators of apoptosis such as and were down-regulated. When the samples were stratified by histological type, the expression of miR-103a and miR-130a was significantly increased in the diffuse-type of GC compared to the intestinal-type. However, no influence of infection was observed on the expression levels of mRNA and miRNAs analyzed. Moreover, the miRNA:mRNA interaction network showed several interrelations between the miRNAs and their target genes, highlighting miR-19a and miR-103a, which has as predicted or validated target a large number of genes in the TNF-α pathway, including and .

Conclusion: Our findings show that cell survival genes mediated by TNF/TNFR2 binding is up-regulated in GC favoring its pro-tumoral effect, while pro-apoptotic genes as CASP3 and TNFR1 are down-regulated, indicating disbalance between apoptosis and cell proliferation processes in this neoplasm. This process can also be influenced by an intricate regulatory network of miRNA:mRNA.

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