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IDDF2018-ABS-0069 Helicobacter pylori DNA promotes cellular proliferation, migration and invasion of gastric cancer by activating toll-like receptor 9

Background 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, this study aimed to evaluate the influence of H. pylori on TLR9 and explore its roles in gastric cancer. Methods TLR9 expression in MKN45 cells was detected using qRT-PCR and western blot assays. Then, TLR9 was knocked down by RNA interference (RNAi) technology in MKN45 cells. The CCK-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 signalling pathway plays an important role in gastric cancer, which might be a potent therapeutic target.