Effect of Rumex Aquaticus Herba Extract Against Helicobacter pylori-Induced Inflammation in Gastric Epithelial Cells.

The purposes of this study were to examine the characteristics of Helicobacter pylori and the effect of Rumex Aquaticus Herba extract on the expression of cytokines in H. pylori-infected gastric epithelial cells. Cultured human adenocarcinoma gastric cells (AGS) were infected by H. pylori in RPMI 1640 media. Cell growth was measured by trypan blue assay. Western blot analysis was performed to investigate effect of extract containing Quercetin-3-O-β-d-glucuronopyranoside (ECQ) on the expression of inflammatory factors and the inhibition on cell growth. Furthermore, we compared the inhibitory effects with various combinations of clarithromycin, amoxicillin, omeprazole, and ECQ. The urease test with Christensen's Urea Agar was performed to identify the urease activity of H. pylori and the effect ECQ has on urease activity. When the cells were exposed to H. pylori, the trypan blue assay revealed a decrease in the rate of cell growth. Western blot analysis showed that H. pylori-infected cells had increased levels of degraded IκB-α and inflammatory factors. Pretreatment with ECQ inhibited interleukin expression induced by H. pylori in a dose-dependent manner. A combination of ECQ and antibiotics inhibited cytokine expression more effectively than other treatments. H. pylori displayed significant urease activity. ECQ did not significantly inhibit urease activity. These data suggest that H. pylori infection has cytotoxic effects against AGS cells, and ECQ may inhibit the production of proinflammatory cytokines in H. pylori-infected AGS cells.