Original Article

Expression analysis of miRNA-155 level in Helicobacter pylori related inflammation and chronic gastritis

Abstract

Background and Objectives: Helicobacter pylori, is a major etiologic agent associated with gastritis. There is more evidence of noncoding microRNAs (miRs) dysregulation in gastrointestinal diseases, including inflammation caused by Helicobacter pylori. Also, the classification of gastrointestinal malignancies using the miRs profile is better than the protein profile. MiRNA-155(miRNA-155) among other miRs plays an important role in control of inflammation and gastric malignancy, so it can be remarkable prognosis marker of gastric cancer in the phase of chronic gastritis. The aim of this study was to compare the expression of miRNA-155 in gastric biopsy and serum samples of adult patients with chronic gastritis.
Materials and Methods: Biopsy and blood samples were collected from endoscopy candidates at Taleghani hospital, Tehran, during 2019. H. pylori infection was detected using histology, culture and molecular PCR methods. Based on cagA and vacA genotyping, the toxicity of H. pylori isolates were determined. After RNA extraction, the expression rate of miRNA-155 was evaluated by real-time polymerase chain reaction (RT-PCR) in gastric tissue and serum of adults infected by H. pylori (n = 30) compared with control group without infection (n = 20). RNU6 housekeeping miRNA were used as endogenous control and statistical analyses were performed using SPSS, ANOVA and Student’s t-test.
Results: miRNA-155 expression in H. pylori infected adult patients increased significantly by 5.61 and 10.11 fold in serum and tissue respectively, compared to that observed in the control group. Evaluation of miRNA-155 expression pattern in relation to bacterial virulence factors showed that the increase in miRNA-155 expression is independent of CagA and VacA toxins.
Conclusion: According to the differential expression patterns of miRNA-155 in serum samples of the infected adult patients, miRNA-155 has the potential to evaluate as chronic gastritis marker.

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IssueVol 14 No 4 (2022) QRcode
SectionOriginal Article(s)
DOI https://doi.org/10.18502/ijm.v14i4.10235
Keywords
Helicobacter pylori; Gastritis; Serum marker; MicroRNA
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How to Cite
1.
Mahboobi R, Fallah F, Yadegar A, Dara N, Kazemi Aghdam M, Asgari B, Hakemi-Vala M. Expression analysis of miRNA-155 level in Helicobacter pylori related inflammation and chronic gastritis. Iran J Microbiol. 2022;14(4):495-502.