Flavonoids with DNA strand-scission activity from Rhus javanica var. roxburghiana |
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Authors: | Lin Chun-Nan Chen Hui-Ling Yen Ming-Hong |
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Institution: | School of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan. |
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Abstract: | The flavonoids isolated from the stems of Rhus javanica var. roxburghiana, taxifolin (1), fisetin (2), fustin (3), 3,7,4'-trihydroxyflavanone (4) and 3,7,4'-trihydroxyflavone (5) caused breakage of supercoiled plasmid pBR322 DNA in the presence of Cu(II). Cu(I) was shown to be an essential intermediate by using the Cu(I)-specific sequestering reagent neocuproine. The Cu(II)-mediated DNA scissions induced by 1, 2, 3 and 5 were inhibited by the addition of catalase and exhibited DNA strand break by the addition of KI and superoxide dimutase (SOD), while in the Cu(II)-mediated DNA scissions induced by 4 was inhibited by the addition of KI, SOD, and catalase. It is concluded that 1, 2, 3, and 5 can induce H(2)O(2) and superoxide anion, while 4 can induce OH() and H(2)O(2) and subsequent oxidative damage of DNA in the presence of Cu(II). |
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Keywords: | Rhus javanica var roxburghiana DNA strand scission Flavonoids |
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