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- W2073060384 abstract "1. Artelinic acid (AL), a water-soluble artemisinin analogue for treatment of multidrug resistant malaria, is metabolized to the active metabolite dihydroqinghaosu (DQHS) solely by CYP3A4/5. Although AL is not metabolized by CYP2C9, it does inhibit diclofenac 4-hydroxylase activity with an IC50 = 115 muM. Interestingly, AL activates CYP2D6-mediated bufuralol metabolism in human liver microsomes but not recombinant CYP2D6-Val by ~30% at AL concentrations up to 100 muM. 2. In human liver microsomes, AL is metabolized to DQHS with a Km = 157 +/- 44 muM and Vmax = 0.77 +/- 0.56 nmol DQHS/min/mg protein. Human recombinant CYP3A4 catalysed the conversion of AL to DQHS with a Km = 102 +/- 23 muM and a Vmax = 1.96 +/- 0.38 nmol DQHS/min/nmol P450. The kinetic parameters (Km and Vmax) for DQHS formation from CYP3A5 were 189 +/- 19 muM and 3.60 +/= 0.42 nmol DQHS/min/nmol P450 respectively. 3. Inhibition studies suggest that azole antifungals and calcium channel blockers may present clinically significant drug-drug interactions. In human liver microsomes, ketoconazole and miconazole were potent competitive inhibitors of DQHS formation with a Ki = 0.028 and 0.124 muM respectively. Verapamil is a non-competitive inhibitor of DQHS formation in human liver microsomes with a Ki = 15muM." @default.
- W2073060384 created "2016-06-24" @default.
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- W2073060384 date "1999-01-01" @default.
- W2073060384 modified "2023-09-23" @default.
- W2073060384 title "Metabolism of artelinic acid to dihydroqinghaosu by human liver cytochrome P4503A" @default.
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- W2073060384 doi "https://doi.org/10.1080/004982599238335" @default.
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