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• W2039001890 abstract "Common in vitro toxicity testing often neglects the fate and intracellular concentration of tested compounds, potentially limiting the predictability of in vitro results for in vivo extrapolation. We used in vitro long-term cultures of primary rat (PRH) and human hepatocytes (PHH) and HepaRG cells to characterise and model the biokinetic profile of ibuprofen (IBU) after single and daily repeated exposure (14 days) to two concentrations. A cross-model comparison was carried out at 100 μM, roughly corresponding to the human therapeutic plasma concentration. Our results showed that IBU uptake was rapid and a dynamic equilibrium was reached within 1 or 2 days. All three cell systems efficiently metabolised IBU. In terms of species-differences, our data mirrored known in vivo results. Although no bioaccumulation was observed, IBU intracellular concentration was higher in PRH due to a 10-fold lower metabolic clearance compared to the human-derived cells. In HepaRG cells, IBU metabolism increased over time, but was not related to the treatment. In PHH, a low CYP2C9 activity, the major IBU-metabolising CYP, led to an increased cytotoxicity. A high inter-individual variability was seen in PHH, whereas HepaRG cells and PRH were more reproducible models. Although the concentrations of IBU in PRH over time differed from the concentrations found in human cells under similar exposure conditions." @default.
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• W2039001890 date "1992-08-01" @default.
• W2039001890 modified "2023-10-17" @default.
• W2039001890 title "Liquid chromatography coupled with high-field proton NMR for profiling human urine for endogenous compounds and drug metabolites" @default.
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• W2039001890 doi "https://doi.org/10.1016/0731-7085(92)80086-3" @default.
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