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• W2034989203 abstract "On the basis of studies conducted in animals, it has been established that isothiocyanates suppress cytochrome P450 activity, leading to impairment of the bioactivation of carcinogens, this being a principal mechanism of their chemopreventive activity. However, no studies have been carried out in human tissue to ascertain whether hepatic cytochrome P450 composition is similarly modulated, and this is the objective of the present studies. Precision-cut liver slices from four donors were incubated with a range of concentrations of phenethyl isothiocyanate (PEITC) for 24h, and the expression and activity of cytochrome P450 enzymes were determined; similar studies were performed in rat slices for comparison. PEITC suppressed the O-dealkylation of methoxyresorufin in all human livers and this was accompanied by a parallel drop in CYP1A2 apoprotein levels; the same effect was noted in rat liver slices. The O-dealkylation of ethoxyresorufin was also impaired in the human livers, despite a rise in CYP1A1 apoprotein levels. The CYP3A-mediated benzyloxyquinoline dealkylation was inhibited by PEITC in only two of the four human donors, whereas a rise in CYP3A4 apoprotein levels was noted in all human livers, albeit to different extent. It is concluded that: (a) PEITC can modulate cytochrome P450 composition in human liver, and (b) PEITC, at concentrations that can be achieved by dietary intake, can antagonise the carcinogenicity of chemicals which rely on the CYP1 family for their bioactivation such as heterocyclic amines and polycyclic aromatic hydrocarbons, and this is likely to be a major contributory mechanism to its chemopreventive activity." @default.
• W2034989203 created "2016-06-24" @default.
• W2034989203 creator A5024914179 @default.
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• W2034989203 date "2010-02-01" @default.
• W2034989203 modified "2023-10-12" @default.
• W2034989203 title "Modulation of carcinogen-metabolising cytochromes P450 in human liver by the chemopreventive phytochemical phenethyl isothiocyanate, a constituent of cruciferous vegetables" @default.
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• W2034989203 doi "https://doi.org/10.1016/j.tox.2009.12.011" @default.
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