Deregulation of MicroRNAs in Gastric Lymphomagenesis Induced in the d3Tx Mouse Model of Helicobacter pylori Infection

Frontiers in Cellular and Infection Microbiology

Cathy Staedel¹  Victoria Korolik²  Elodie Sifré³  Amandine M. Laur³  Caroline Capdevielle³  Julien Izotte³  Philippe Lehours³  Pauline Floch³  Francis Mégraud³  Pierre Dubus³  Alban Giese³ 

[1] ARNA Laboratory, Institut National de la Santé et de la Recherche Médicale U1212, Université de BordeauxBordeaux, France;Institute for Glycomics, Griffith UniversityGold Coast, QLD, Australia;UMR1053 Bordeaux Research in Translational Oncology, Institut National de la Santé et de la Recherche Médicale, University of BordeauxBordeaux, France;

关键词: MALT lymphoma;    Helicobacter pylori;    microRNAs;    apoptosis;    TP53INP1;   

DOI  :  10.3389/fcimb.2017.00185

来源: DOAJ

【 摘 要 】

Helicobacter pylori infection is considered as an excellent model of chronic inflammation-induced tumor development. Our project focuses on gastric MALT lymphoma (GML) related to H. pylori infection and mediated by the chronic inflammatory process initiated by the infection. Recently, microRNAs (miRNAs) have emerged as a new class of gene regulators, which play key roles in inflammation and carcinogenesis acting as oncogenes or tumor suppressors. Their precise characterization in the development of inflammation and their contribution in regulating host cells responses to infection by H. pylori have been little explored. Our goal was to analyze the changes in miRNAs in a GML mouse model using BALB/c mice thymectomized at day 3 post-birth (d3Tx model) and to clarify their implication in GML pathogenesis. PCR array followed by RT-qPCR identified five miRNAs (miR-21a, miR-135b, miR-142a, miR-150, miR-155) overexpressed in the stomachs of GML-developing d3Tx mice infected by H. pylori. The analysis of their putative targets allowed us to identify TP53INP1, an anti-proliferative and pro-apoptotic protein, as a common target of 4 of the 5 up-regulated miRNAs. We postulate that these miRNAs may act in synergy to promote the development of GML. miR-142a was also overexpressed in mouse sera samples and therefore could serve as a diagnostic marker. In situ hybridization on gastric samples with miR-142a revealed a global up-regulation of this miRNA by the tumor microenvironment at the lymphoma stage. Dysregulation of miR-21a, miR-135b, miR-142a, miR-150, miR-155 could play a critical role in the pathogenesis of GML and might offer potential applications as therapeutic targets and novel biomarkers for this disease.

【 授权许可】

Unknown