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• W2912102420 abstract "An in vitro to in vivo (IVIVE) extrapolation based-physiologically based pharmacokinetic (PBPK) modeling approach was demonstrated to understand age-related differences in kinetics and how they potentially affect age-related differences in acute neurotoxic effects of pyrethroids. To describe the age-dependent changes in pyrethroid kinetics, it was critical to incorporate age-dependent changes in metabolism into the model. As such, in vitro metabolism data were collected for 3 selected pyrethroids, deltamethrin (DLM), cis-permethrin, and trans-permethrin, using liver microsomes and cytosol, and plasma prepared from immature and adult rats. Resulting metabolism parameters, maximum rate of metabolism (Vmax) and Michaelis-Menten constant (Km), were biologically scaled to respective in vivo parameters for use in the age-specific PBPK model. Then, age-dependent changes in target tissue exposure, i.e., brain Cmax, to a given pyrethroid were simulated across ages using the model. The PBPK model recapitulated in vivo time-course plasma and brain concentrations of the 3 pyrethroids in immature and adult rats following oral administration of both low and high doses of these compounds. A single model structure developed for DLM was able to describe the kinetics of the other 2 pyrethroids when used with compound- and age-specific metabolism parameters, suggesting that one generic model for pyrethroids as a group can be used for early age-sensitivity evaluation if appropriate metabolic parameters are used. This study demonstrated the validity of applying IVIVE-based PBPK modeling to development of age-specific PBPK models for pyrethroids in support of pyrethroid risk assessment of potentially sensitive early age populations in humans." @default.
• W2912102420 created "2019-02-21" @default.
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• W2912102420 date "2019-02-15" @default.
• W2912102420 modified "2023-10-14" @default.
• W2912102420 title "Evaluation of Age-Related Pyrethroid Pharmacokinetic Differences in Rats: Physiologically-Based Pharmacokinetic Model Development Using In Vitro Data and In Vitro to In Vivo Extrapolation" @default.
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• W2912102420 doi "https://doi.org/10.1093/toxsci/kfz042" @default.
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