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- W3148986143 abstract "Objective:To investigate the propensity of plumbagin to inhibit the three isoforms of human cytochrome P450（CYP）,ie.,CYP1A2,CYP2C19,and CYP3A4 using human liver microsomes in ritro.Methods:Inhibitory effects of plumbagin on the three human CYP isoformswere investigated using pooled human liver microsomes.Phenacetin O-deethylation,omeprazole hydroxylation and nifedipine oxidation were used as selective substrates for CYP1A2,CYP2C19 and CYP3A4 activities,respectively.Concentrations of paracetamol,5-hydroxyomeprazole,and oxidized nifedipine were determined in microsomal incubation mixture using high performance liquid chromatography.Results:Plumbagin showed significantinhibitory effects on all CYP isoforms.but with the most potent activity on CYP2C19-mediated omeprazole hydroxylation.The IC50（concentration that inhibits enzyme activity by 50%） values of plumbagin and nootkatone（selective inhibitor） for CYP2C19 were（0.78±0.01） and（27.31±0.66） μM,respectively.The inhibitory activities on CYP1 A2-mediated phenacetin O-deethylation and CYP3A4-mediated nifedipine oxidation were moderate.The IC50values of plumbagin and-naphthoflavone（selective inhibitor） for CYP1A2 were（1.39±0.01） and（0.02±.0.36） μM,respectively.The corresponding IC50values of plumbagin and ketoconazole（selective inhibitor） for CYP3A4 were（2.37+0.10） and（0.18±0.06） μM,respectively.Conclusions:Clinical relevance of the interference of human drug metabolizing enzymes should be aware of for further development scheme of plumbagin as antimalarial drug when used in combination with other antimalarial drugs which are metabolized by these CYP isoforms." @default.
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- W3148986143 date "2015-01-01" @default.
- W3148986143 modified "2023-09-24" @default.
- W3148986143 title "In vitro inhibitory effects of plumbagin,the promising antimalarial candidate,on human cytochrome P450 enzymes" @default.
- W3148986143 hasPublicationYear "2015" @default.
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