Virulence Factors of Helicobacter Pylori Vaca Increase Markedly Gastric Mucosal Tgf-Β1 Mrna Expression in Gastritis Patients Publisher Pubmed



Rahimian G¹ ; Sanei MH² ; Shirzad H³ ; Azadegandehkordi F³ ; Taghikhani A¹ ; Salimzadeh L³ ; Hashemzadehchaleshtori M³ ; Rafieiankopaei M⁴ ; Bagheri N⁵
Source: Microbial Pathogenesis Published:2014

Abstract

Objective: Helicobacter pylori (H. pylori) infection is the main cause of gastric inflammation. Regulatory T cells (Treg cells) suppress the activation and proliferation of antigen-specific T cells and mediate immunologic tolerance. TGF-β1 was shown to be secreted in a subset of Treg cells known as 'Th3 cells'. These cells have not been sufficiently studied in context to H.pylori-induced inflammation in human gastric mucosa. In this study we therefore, aimed to investigate the expression of TGF-β1 in the context of H.pylori colonization in chronic gastritis, to examine the relationship between it and histopathologic findings and to compare it with virulence factors. Patients and methods: Total RNA was extracted from gastric biopsies of 48 H.pylori-infected patients and 38 H.pylori-negative patients with gastritis. Mucosal TGF-β1 mRNA expression in H.pylori-infected and uninfected gastric biopsies was determined by real-time PCR. Presence of vacA, cagA, iceA, babA2 and oipA virulence factors was evaluated using PCR. Results: TGF-β1 mRNA expression was significantly increased in biopsies of H.pylori-infected patients compared to H.pylori-uninfected patients. There was association between virulence factors and TGF-β1 mRNA expression. TGF-β1 mRNA expression in mucosa was significantly higher in patients with vacA s1 and s1m1. Conclusions: TGF-β1 may play an important role in the inflammatory response and promote the chronic and persistent inflammatory changes in the gastric. This may ultimately influence the outcome of H.pylori-associated diseases that arise within the context of gastritis and vacA may suffice to induce expression of TGF-β1 mRNA. © 2014 Elsevier Ltd.