Effects of radix curcumae-derived diterpenoid C on IkBα degradation caused by Helicobacter pylori. A: After gastric epithelium cell line cells were respectively treated with Helicobacter pylori for 0, 15, 30, 60 and 90 min, cytoplasm was isolated to be used for determination of IkBα degradation with Western blotting; B: Helicobacter pylori for 0, 5, 15 and 30 min; C: Diterpenoid C + Helicobacter pylori for 0, 5, 15 and 30 min.