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• W2087335973 abstract "epsilon-Viniferin, a dimer of resveratrol, was isolated in wine at concentration between 0.5 and 5 microM. As resveratrol and polyphenols from red wine were reported to inhibit cytochrome P450 (CYP) activities, this led us to investigate the inhibitory effects of epsilon-viniferin on human CYP1A1, CYP1A2, CYP1B1, CYP2A6, CYP2B6, CYP2E1, CYP3A4 and CYP4A activities. These effects were compared to those of resveratrol and non volatiles compounds from red wine or various Cognac(R) beverages (enriched with oak-polyphenols). Assays were carried out on human liver microsomes and heterologously expressed CYPs. Ethoxyresorufin, coumarin, benzoxyresorufin, chlorzoxazone, testosterone and lauric acid were used as selective substrates for CYP1A1, CYP1A2, CYP1B1, CYP2A6, CYP2B6, CYP2E1, CYP3A4 and CYP4A, respectively. epsilon-viniferin displayed a more potent inhibitory effect than resveratrol for all the CYP activities tested (Ki 0.5 to 20 microM vs. 10 to 100 microM, respectively). This effect was not due to an inhibition of the NADPH reductase. A particularly potent inhibitory effect was shown for CYP1A1, CYP1B1 and CYP2B6 which are involved in bioactivation of numerous carcinogens. epsilon-viniferin was not a mechanism-based inhibitor of human CYPs. It displayed, like resveratrol, mixed-type inhibitions for all the CYP tested, except for CYP2E1 (non-competitive). Comparison of the inhibitory effects exerted on CYP activities by epsilon-viniferin, resveratrol and non volatile components from red wine or various Cognac beverages showed that neither resveratrol, nor epsilon-viniferin is the main CYP inhibitor present in red wine solids." @default.
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• W2087335973 date "2003-07-01" @default.
• W2087335973 modified "2023-10-17" @default.
• W2087335973 title "Differential inhibition of human cytochrome P450 enzymes by ε-viniferin, the dimer of resveratrol: comparison with resveratrol and polyphenols from alcoholized beverages" @default.
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• W2087335973 doi "https://doi.org/10.1016/s0024-3205(03)00420-x" @default.
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