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• W2018388512 abstract "Abstract Background The ATP-binding cassette (ABC) transporters P-glycoprotein (P-gp)/ABCB1 and breast cancer resistance protein (BCRP)/ABCG2 are involved in the intestinal absorption and renal excretion of various substrate drugs. Their activities affect sub-therapeutic drug concentrations and excretion of natural transporter substrates. The new oral anti-HCV drug telaprevir has dramatically improved the efficacy of hepatitis-C virus (HCV) treatment, and recent studies have suggested a possible pharmacological interaction between telaprevir and P-gp. We studied the kinetics of in vitro interactions between telaprevir and P-gp and BCRP to understand the molecular basis of that interaction. Findings The effect of telaprevir on P-gp- and BCRP-mediated transport was evaluated by an in vitro vesicle transporter assay using different transport substrates, and the kinetics of transporter inhibition was determined. The results showed that telaprevir could inhibit P-gp- and BCRP-mediated transport in the in vitro vesicle transport assay, with each IC 50 values of ≈ 7 μmol/L and ≈ 30 μmol/L, respectively. Analyses of Lineweaver–Burk plots showed that telaprevir was likely to be a competitive inhibitor against P-gp and BCRP. Photoaffinity labeling experiments were employed to observe competitive inhibition by telaprevir using iodoarylazidoprazosin (IAAP) as a binding substrate for P-gp and BCRP. These experiments revealed that telaprevir inhibited [ 125 I]-IAAP-binding with P-gp and BCRP. Conclusion Telaprevir competitively inhibited P-gp and BCRP, and P-gp-mediated transport was more sensitive to telaprevir compared with BCRP-mediated transport. These data suggest that telaprevir represses the transporter functions of P-gp and BCRP via direct inhibition." @default.
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• W2018388512 date "2013-11-06" @default.
• W2018388512 modified "2023-10-10" @default.
• W2018388512 title "Biochemical interaction of anti-HCV telaprevir with the ABC transporters P-glycoprotein and breast cancer resistance protein" @default.
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• W2018388512 doi "https://doi.org/10.1186/1756-0500-6-445" @default.
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