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- W2000755812 abstract "The limited value of in vitro toxicity data for the in vivo extrapolation has been often attributed to the lack of kinetic data. Here the in vitro kinetics of amiodarone (AMI) and its mono-N-desethyl (MDEA) metabolite was determined and modelled in primary human hepatocytes (PHH) and HepaRG cells, after single and repeated administration of clinically relevant concentrations. AMI bioavailability was influenced by adsorption to the plastic and the presence of protein in the medium (e.g. 10% serum protein reduced the uptake by half in HepaRG cells). The cell uptake was quick (within 3 h), AMI metabolism was efficient and a dynamic equilibrium was reached in about a week after multiple dosing. In HepaRG cells the metabolic clearance was higher than in PHH and increased over time, as well as CYP3A4. The interindividual variability in MDEA production in PHHs was not proportional to the differences in CYP3A4 activities, suggesting the involvement of other CYPs and/or AMI-related CYP inhibition. After repeated treatment AMI showed a slight potential for bioaccumulation, whereas much higher intracellular MDEA levels accumulated over time, especially in the HepaRG cells, associated with occurrence of phospholipidosis. The knowledge of in vitro biokinetics is important to transform an actual in vitro concentration–effect into an in vivo dose–effect relationship by using appropriate modelling, thus improving the in vitro-to-in vivo extrapolation." @default.
- W2000755812 created "2016-06-24" @default.
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- W2000755812 date "2015-12-01" @default.
- W2000755812 modified "2023-10-16" @default.
- W2000755812 title "In vitro kinetics of amiodarone and its major metabolite in two human liver cell models after acute and repeated treatments" @default.
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- W2000755812 doi "https://doi.org/10.1016/j.tiv.2014.12.012" @default.
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