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Year : 2019  |  Volume : 15  |  Issue : 1  |  Page : 108-114

miR-146a is deregulated in gastric cancer

1 Department of Microbiology, Faculty of Biological Science, Islamic Azad University, Falavarjan Branch, Isfahan, Iran
2 Department of Biology, Division of Genetics, Faculty of Sciences, University of Isfahan, Isfahan, Iran; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
3 Department of Biology, Division of Cellular and Molecular Biology, Faculty of Sciences, University of Isfahan; Department of Cellular Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
4 Department of Pathology, School of Medicine, Isfahan University of Medical Science, Isfahan, Iran
5 Zist-Fanavari Novin Biotechnology Institute, Isfahan, Iran

Correspondence Address:
Prof. Kamran Ghaedi
Department of Biology, Division of Cellular and Molecular Biology, Faculty of Sciences, University of Isfahan, Isfahan 81746-73441
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jcrt.JCRT_855_17

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Background: Gastric cancer is one of the most significant reasons for cancer-related death. miR-146a is one of the dysregulated factors associated with gastric tumorigenesis. However, deregulation of this microRNA (miRNA) has become controversial. Moreover, the inflammation-mediating role of this miRNA implies that miR-146a might be dysregulated by gastric cancer-related pathogens, such as Helicobacter pylori. However, the dysregulation of miR-146a in H. pylori-infected gastric tumors has not been widely studied. Objectives: We aimed to analyze the expression level of miR-146a in gastric cancer tissues and then to assess any potential association between miR-146a and H. pylori infection and other clinical characteristics. Materials and Methods: miR-146a expression level was quantitatively studied by reverse transcription quantitative polymerase chain reaction, in 144 fresh tissues including 44 normal and 100 gastric cancer samples. Results: A dramatic overexpression of miR-146a was observed in primary gastric tumors. miR-146a showed lower expression in progressed tumors with greater stages and lymph node metastasis. Conclusion: miR-146a is highly expressed in primary gastric tumor independent of H. pylori infection. It is highly expressed in the lower stages and lymph node-negative tumors. It might suggest the importance of upregulation and downregulation of this miRNA in the initiating/promoting and progressive steps of gastric tumorigenesis, respectively.

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