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This study was designed to investigate the beneficial effects of fermented Rhus verniciflua stem bark extract (RVSBE) on the stomach. We evaluated RVSBE for its antimicrobial activity against Helicobacter pylori (H. pylori), along with its ability to reduce the viability of human gastric cancer AGS cells. In addition, its anti-inflammatory effect was examined by evaluating nitric oxide (NO) production, and inducible nitric oxide synthase (iNOS) and cyclooxygenase (COX)-2 mRNA expression in lipopolysaccharide (LPS)-stimulated RAW264.7 cells. RVSBE showed antimicrobial activity, as 2.0 mg of the extract produced a clear inhibition zone of 4.0 mm. RVSBE inhibited the growth of AGS cells by 20% at concentrations ranging from 0.25-1.0 mg/mL. Regarding the anti-inflammatory effects of RVSBE, at 0.1-1.0 mg/mL, the extract showed more than 75% inhibition of NO production. In addition, cells treated with 0.25 mg/mL RVSBE showed a 25% decrease in iNOS mRNA levels compared to those in the LPS-treated cells. These results suggest that RVSBE may have significant inhibitory effects on inflammatory mediators, and therefore, may be a potential anti-inflammatory candidate.

Anti-inflammatory activities of fermented Rhus verniciflua stem bark extract and its growth inhibitory effect on Helicobacter pylori