Antimutagenicity of Flavones and Flavonols to Heterocyclic Amines by Specific and Strong Inhibition of the Cytochrome P450 1A Family
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概要
- 論文の詳細を見る
We found the mechanism in flavonoids that can strongly suppress the mutagenicity of one of the food-derived and carcinogenic heterocyclic amines, 3-amino-1-methyl-5H-pyrido [4,3-b] indole (Trp-P-2). The antimutagenicity was evaluated by IC_<50> value, the amount required for 50% inhibition of the mutagenicity of 0.1 nmol Trp-P-2,with Salmonella typhimurium TA98 strain in the presence of S9 mix. The flavones and flavonols were two orders stronger as antimutagens than such antimutagenic phytochemicals as chlorophylls and catechins. We had previously found flavonoids to be a desmutagen to neutralize Trp-P-2 before or during attack of DNA, because they had no effect on either the ultimate mutagenic form of Trp-P-2 (N-hydroxy-Trp-P-2) or the mutated cells. The desmutagenicity of the flavonoids did not depend on the hydroxy number or position that should be associated with antioxidative potency, and was also unaffected by the solubility of Trp-P-2 in the assay solution. The inhibitory effect of the flavonoids on the metabolic activation of Trp-P-2 to N-hydroxy-Trp-P-2 was almost in parallel with the antimutagenic IC_<50> value, when determined with a Saccharomyces cerevisiae AH22 cell simultaneously expressing both rat cytochrome P450 1A1 and yeast reductase. The K_i values of flavones and flavonols for the enzyme were less than 1 μM, while the K_m value of Trp-P-2 was 25μM. The antimutagenicity of the flavones and flavonols was thus concluded to be due to inhibition of the activation process of Trp-P-2 by P450 1A1 to the ultimate carcinogenic form. They were also able to act as antimutagens toward other indirect mutagens that were activated by P450 1A1.
- 社団法人日本農芸化学会の論文
- 1998-05-23
著者
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ASHIDA Hitoshi
Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University
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Kanazawa K
Laboratory Of Food And Nutritional Chemistry Graduate School Of Agriculture Kobe University
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Kanazawa Kazuki
Dep. Of Agrobioscience Graduate School Of Agricultural Sci. Kobe Univ.
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Kanazawa Kazuki
Department Of Agricultural Chemistry Faculty Of Agriculture Kobe University
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DANNO Gen-ichi
Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University
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DANNO Genichi
Department of Life Science, Graduate School of Science and Technology, Kobe University
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YAMASHITA Takatoshi
Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University
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Kanazawa K
Dep. Of Agrobioscience Graduate School Of Agricultural Sci. Kobe Univ.
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Kanazawa Kazuki
Department Of Biosystems Science Graduate School Of Agricultural Science Kobe University
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Ashida H
Department Of Biofunctional Chemistry Faculty Of Agriculture Kobe University
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Ashida Hitoshi
Department Of Utilization Of Biological Resources Kobe University
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Ashida Hitoshi
Department Of Agricultural Chemistry Kobe University
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Ashida Hitoshi
Graduate School Of Science & Technology Division Of Life Science Kobe University
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Ashida Hitoshi
Department Of Life Science Graduate School Of Science And Technology Kobe University
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Ashida Hitoshi
Department Of Agrobioscience Graduate School Of Agricultural Science Kobe University:research Center
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Ashida Hitoshi
Res. Center For Food Safety And Security Graduate School Of Agricultural Sci. Kobe Univ.
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Danno G
Department Of Biofunctional Chemistry Faculty Of Agriculture Kobe University
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Yamashita Takatoshi
Department Of Biofunctional Chemistry Faculty Of Agriculture Kobe University
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