Saudi Journal of Gastroenterology
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Year : 2019  |  Volume : 25  |  Issue : 3  |  Page : 181-187

Helicobacter pylori DNA promotes cellular proliferation, migration, and invasion of gastric cancer by activating toll-like receptor 9

1 Department of Gastroenterology, Changzhou No. 2 People's Hospital, Changzhou, China
2 Department of Gynecology, Changzhou No. 2 People's Hospital, Changzhou, China

Correspondence Address:
Dr. Xiao-Yong Wang
Xinglong Xiang 29, Changzhou City, Jiangsu Province
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/sjg.SJG_309_18

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Background/Aim: Helicobacter pylori (H. pylori) infection is a well-known risk factor for gastric cancer. Toll-like receptor 9 (TLR9) plays an important role in many cancers and is important for immunity to H. pylori infection. Thus, the present study aimed to evaluate the influence of H. pylori on TLR9 and explore its roles in gastric cancer. Materials and Methods: TLR9 expression in MKN45 cells, which were cocultured with or without H. pylori or H. pylori DNA, was detected using quantitative reverse transcription-polymerase chain reaction and Western blot assays. Then, TLR9 was knocked down through RNA interference technology in MKN45 cells. Cell Counting Kit-8 assay was performed to investigate cell proliferation, and the Transwell system was established to test the migrative and invasive abilities of MKN45 cells. Results: H. pylori infection or H. pylori DNA level was positively correlated with TLR9 upregulation in MKN45 cells. In vitro, H. pylori DNA significantly accelerated cell proliferation and promoted the migration and invasion in MKN45 cells. In contrast, the knockdown of TLR9 significantly suppressed cell proliferation and inhibited the migration and invasion in MKN45 cells. Conclusions: The present results suggest that the H. pylori DNA/TLR9-signaling pathway plays an important role in gastric cancer, which might be a potential therapeutic target.

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