Suppression of Lipid Hydroperoxide-Induced Oxidative Damage to Cellular DNA by Esculetin
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- Kaneko Takao
- Redox Regulation Research Group, Tokyo Metropolitan Institute of Gerontology
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- Tahara Shoichi
- Redox Regulation Research Group, Tokyo Metropolitan Institute of Gerontology
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- Takabayashi Fumiyo
- Shizuoka Junior College, University of Shizuoka
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Linoleic acid hydroperoxide (LOOH) has been reported to cause an increase in the content of 8-oxo-7,8-dihydro-2′-deoxyguanosine (8-oxodG), a typical oxidation product of DNA bases, in cultured cells due to coexisting iron(III) ion. We examined whether coumarins are able to suppress the formation of 8-oxodG in the DNA of human diploid fibroblasts, TIG-7 cells, treated with LOOH and iron(III) ion. Cotreatment of TIG-7 cells with esculetin (6,7-dihydroxycoumarin) significantly suppressed the increase in 8-oxodG content induced by LOOH and iron(III) ion. Pretreatment of cells with esculetin for 24 h was also effective in protecting cellular DNA against oxidative damage induced by subsequent treatment with LOOH and iron(III) ion. Pretreatment with esculin, the 6-glucoside of esculetin, was effective, but to a lesser extent. Furthermore, the free radical-scavenging activities of coumarins and hydroxycinnamic acids were examined by measuring the inhibition of spin-adduct formation of hydroxyl radicals with 5,5-dimethyl-1-pyrroline N-oxide (DMPO). Compounds bearing an ortho-catechol moiety, such as esculetin, fraxetin, and caffeic acid, significantly reduced the ESR signal intensities of the DMPO-OH spin adduct. These results indicate that esculetin is effective in protecting cells against DNA damage induced by oxidative stress and that the presence of an ortho-catechol moiety is important for antioxidant activities against reactive oxygen species.
収録刊行物
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- Biological & Pharmaceutical Bulletin
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Biological & Pharmaceutical Bulletin 26 (6), 840-844, 2003
公益社団法人 日本薬学会
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詳細情報 詳細情報について
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- CRID
- 1390001204626550400
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- NII論文ID
- 110003608528
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- NII書誌ID
- AA10885497
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- COI
- 1:CAS:528:DC%2BD3sXls1KnsL4%3D
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- ISSN
- 13475215
- 09186158
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- NDL書誌ID
- 6541587
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- PubMed
- 12808296
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可