Abstract
Objective: To evaluate the antioxidant activity of extracts and fractions from Stachys sieboldii Miq., and to examine its effect on the cellular reactive oxygen species (ROS) and glutathione (GSH) production and genomic DNA oxidation in HT-1080 cells. Methods: The ROS generation induced by H2O2 was measured by the dichlorofluorescein-diacetate assay. GSH levels were measured using a fluorescent method with mBBr. Genomic DNA oxidative damage was measured with levels of oxidative DNA induced by the reaction of ferritin with H2O2. Results: The n-hexane, 85% aqueous methanol and n-butanol fractions (0.05 mg/mL concentrations) inhibited H2O2-induced ROS generation by 63%, 35% and 45%, respectively. GSH levels were significantly increased in both acetone+methylene chloride and methanol extracts (P
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