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• W2000591631 endingPage "182" @default.
• W2000591631 startingPage "175" @default.
• W2000591631 abstract "This study investigated the individual and combined effects of β-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 β-carotene, a flavonoid, or both for 1 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 β-carotene at 20 μM 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 β-carotene was associated with an increased metabolism of NNK by CYP because the concomitant addition of 1-aminobenzotriazole, a CYP inhibitor, with β-carotene to cells strongly inhibited NNK-induced DNA strand breaks. In contrast to β-carotene, incubation of cells with naringin, quercetin or rutin added at 23 μM 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 β-carotene with any of these flavonoids significantly inhibited the enhancing effect of β-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 β-carotene with any of these flavonoids also significantly inhibited the loss of β-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 β-carotene with naringin, rutin, or quercetin may increase the safety of β-carotene." @default.
• W2000591631 created "2016-06-24" @default.
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• W2000591631 date "2006-03-01" @default.
• W2000591631 modified "2023-10-16" @default.
• W2000591631 title "Flavonoids suppresses the enhancing effect of β-carotene on DNA damage induced by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) in A549 cells" @default.
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• W2000591631 doi "https://doi.org/10.1016/j.cbi.2006.01.006" @default.
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