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• W2112080927 abstract "The magnitude of P-glycoprotein [(P-gp)/multidrug resistance protein 1 (MDR1)]-mediated drug-drug interaction (DDI) at the blood-brain barrier (BBB) in rats was estimated by in vitro-in vivo correlation (IVIVC). In in vitro studies, rat Mdr1a-expressing LLC-PK1 cells were examined for the evaluation of P-gp inhibitory activity using digoxin as a P-gp probe substrate. The in vitro <i>K</i>_i value was calculated using a modified corrected flux ratio that reflects the P-gp function. In in vivo studies, digoxin with or without P-gp inhibitors was administered to rats by constant intravenous infusion to evaluate the effect of P-gp inhibition on digoxin transport to the brain under steady-state conditions. In the presence of elacridar, the brain-to-plasma concentration ratio (<i>K</i>_p,brain) of digoxin was approximately 14 times the control value. However, no significant change in the <i>K</i>_p,brain was observed in the presence of clinically used P-gp inhibitors, with the exception of cyclosporine A. A positive correlation was found between the in vivo <i>K</i>_p,brain of digoxin and [I_,unbound/<i>K</i>_i] (where I_,unbound is the unbound plasma concentration of P-gp inhibitors). Compounds with [I_,unbound/<i>K</i>_i] values of >1 increased <i>K</i>_p,brain of digoxin in rats. In summary, we used a quantitative approach to evaluate the impact of P-gp-mediated DDI at the rat BBB. We successfully established the IVIVC, which indicated the potential DDI in the presence of potent P-gp inhibitors. On the basis of the IVIVC in rats and <i>K</i>_i values in human MDR1, we speculated that clinically used P-gp inhibitors do not cause DDI at the human BBB, because none of the compounds studied showed [I_,unbound/<i>K</i>_i] values of >1 at therapeutic doses." @default.
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• W2112080927 date "2010-10-20" @default.
• W2112080927 modified "2023-10-05" @default.
• W2112080927 title "Quantitative Investigation of the Impact of P-Glycoprotein Inhibition on Drug Transport across Blood-Brain Barrier in Rats" @default.
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• W2112080927 doi "https://doi.org/10.1124/dmd.110.035774" @default.
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