title: Prevention of cellular ROS damage by isovitexin and related flavonoids.
abstract: The antioxidant properties of isovitexin and related flavonoids were studied. Isovitexin inhibited xanthine oxidase with an IC50 value of = 15.2 microM. The flavonoid analogues, apigenin, kaempferol, quercetin, myricetin, and genistein also inhibited xanthine oxidase with IC50 values of 0.58, 2.18, 1.09, 9.90, and 4.83 microM, respectively. Isovitexin protected DNA from the Fenton reaction-induced breakage in a dose-dependent manner with an IC50 value of 9.52 microM. Isovitexin also protected HL-60 cells from the ROS damage induced by the xanthine/xanthine oxidase reaction. Isovitexin exhibited the lowest cytotoxicity toward HL-60 cells (LD50 >400 microM) compared to the other flavonoids examined. In addition, excess hydrogen peroxide induced by cadmium in A2780 ovarian cells was significantly suppressed by isovitexin. These results suggest that isovitexin in rice may protect cells from oxidative stress.
authors: Chun-Mao
authors: CM
authors: Lin
authors: Chien-Tsu
authors: CT
authors: Chen
authors: Hsiao-Hui
authors: HH
authors: Lee
authors: Jen-Kun
authors: JK
authors: Lin
mesh_terms: D047310:Apigenin; D002104:Cadmium / Q000494:pharmacology; D004249:DNA Damage / Q000187:drug effects; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology*; D018922:HL-60 Cells; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism; D012275:Oryza; D018384:Oxidative Stress / Q000187:drug effects*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism; D019820:Xanthine / Q000378:metabolism / Q000494:pharmacology; D014969:Xanthine Oxidase / Q000378:metabolism / Q000494:pharmacology
chemical_list: D005419:Flavonoids; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D002104:Cadmium; D019820:Xanthine; D047310:Apigenin; D006861:Hydrogen Peroxide; D014969:Xanthine Oxidase; C049772:isovitexin