Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/61966
標題: Flavonoids suppresses the enhancing effect of beta-carotene on DNA damage induced by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) in A549 cells
作者: Yeh, S.L.
胡淼琳
Wang, W.Y.
Huang, C.S.
Hu, M.L.
關鍵字: beta-carotene
flavonoids
NNK interaction
DNA damage
lung-cancer
vitamin-e
cytochrome-p450 1a2
oxygen radicals
strand
breaks
male smokers
in-vitro
risk
antioxidant
quercetin
期刊/報告no:: Chemico-Biological Interactions, Volume 160, Issue 2, Page(s) 175-182.
摘要: This study investigated the individual and combined effects of beta-carotene with a common flavonoid (naringin, quercetin or rutin) on DNA damage induced by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), a potent tobacco-related carcinogen in human. A human lung cancer cell line, A549, was pre-incubated with beta-carotene, a flavonoid, or both for I h followed by incubation with NNK for 4 h. Then, we determined DNA strand breaks and the level of 7-methylguanine (7-mGua), a product of NNK metabolism by cytochrome P450 (CYP). We showed that beta-carotene at 20 mu M significantly enhanced NNK-induced DNA strand breaks and 7-mGua levels by 90% (p < 0.05) and 70% (p < 0.05), respectively, and that the effect of P-carotene was associated with an increased metabolism of NNK by CYP because the concomitant addition of 1-aminobenzotriazole, a CYP inhibitor, with beta-carotene to cells strongly inhibited NNK-induced DNA strand breaks. In contrast to beta-carotene, incubation of cells with naringin, quercetin or rutin added at 23 mu M led to significant inhibition of NNK-induced DNA strand breaks, and the effect was in the order of quercetin > naringin > rutin. However, these flavonoids did not significantly affect the level of 7-mGua induced by NNK. Co-incubation of beta-carotene with any of these flavonoids significantly inhibited the enhancing effect of beta-carotene on NNK-induced DNA strand breaks; the effects of flavonoids were dose-dependent and were also in the order of quercetin > naringin > rutin. Co-incubation of beta-carotene with any of these flavonoids also significantly inhibited the loss of beta-carotene incorporated into the cells, and the effects of the flavonoids were also in the order of quercetin > naringin > rutin. The protective effects of these flavonoids may be attributed to their antioxidant activities because they significantly decreased intracellular ROS. and the effects were also in the order of quercetin > naringin > rutin. These in vitro results suggest that a combination of beta-carotene with naringin, rutin, or quercetin may increase the safety of beta-carotene. (c) 2006 Elsevier Ireland Ltd. All rights reserved.
URI: http://hdl.handle.net/11455/61966
ISSN: 0009-2797
文章連結: http://dx.doi.org/10.1016/j.cbi.2006.01.006
Appears in Collections:食品暨應用生物科技學系

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