title: Protection by Chrysanthemum zawadskii extract from liver damage of mice caused by carbon tetrachloride is maybe mediated by modulation of QR activity.
abstract: Our previous study demonstrated that methanolic extract of Chrysanthemum zawadskii Herbich var. latilobum Kitamura (Compositae) has the potential to induce detoxifying enzymes such as NAD(P)H:(quinone acceptor) oxidoreductase 1 (EC 1.6.99.2) (NQO1, QR) and glutathione S-transferase (GST). In this study we further fractionated methanolic extract of Chrysanthemum zawadskii and investigated the detoxifying enzyme-inducing potential of each fraction. The fraction (CZ-6) shown the highest QR-inducing activity was found to contain (+)-(3S,4S,5R,8S)-(E)-8-acetoxy-4-hydroxy-3-isovaleroyloxy-2-(hexa-2,4-diynyliden)-1,6-dioxaspiro [4,5] decane and increased QR enzyme activity in a dose-dependent manner. Furthermore, CZ-6 fraction caused a dose-dependent enhancement of luciferase activity in HepG2-C8 cells generated by stably transfecting antioxidant response element-luciferase gene construct, suggesting that it induces antioxidant/detoxifying enzymes through antioxidant response element (ARE)-mediated transcriptional activation of the relevant genes. Although CZ-6 fraction failed to induce hepatic QR in mice over the control, it restored QR activity suppressed by CCl(4) treatment to the control level. Hepatic injury induced by CCl(4) was also slightly protected by pretreatment with CZ-6. In conclusion, although CZ-6 fractionated from methanolic extract of Chrysanthemum zawadskii did not cause a significant QR induction in mice organs such as liver, kidney, and stomach, it showed protective effect from liver damage caused by CCl(4).
authors.affiliation: Department of Animal Science and Biotechnology and School of Applied Biosciences, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea.
authors.forename: Ji Yeon
authors.initials: JY
authors.lastname: Seo
authors.forename: Soon Sung
authors.initials: SS
authors.lastname: Lim
authors.forename: Jia
authors.initials: J
authors.lastname: Park
authors.forename: Ji-Sun
authors.initials: JS
authors.lastname: Lim
authors.forename: Hyo Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Hui Jung
authors.initials: HJ
authors.lastname: Kang
authors.forename: Jung Han
authors.initials: JH
authors.lastname: Yoon Park
authors.forename: Jong-Sang
authors.initials: JS
authors.lastname: Kim
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