Translational toxicology of sex specific PFNA clearance in rat and human
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Kim et al. proposed a physiologically based toxicokinetic (PBTK) model for perfluorononanoic acid (PFNA) and perfluorodecanoic acid (PFDA) (Kim et al. 2019). In the absence of human-specific data they extrapolated findings from rats to humans. This being possible is one of the great advantages of PBTK modeling. While on the right path, they may want to amend their reasoning to avoid logical fallacies and arrive at sound conclusions.
The model proposed by Kim et al. explicitly rules out tubular secretion for PFNA and PFDA (Kim et al. 2019). We challenged this assumption to avoid potentially wrong conclusions in human risk assessment (Hethey et al. 2019). The response (Choi et al. 2019) did not convince us, but highlighted the key difference to our calculation: where we used an array of experimentally determined values for the glomerular filtration rate (GFR), they focus on an assumed value.
Clearly, given values for renal plasma clearance (CLren) and unbound fraction (Fr), deductions...
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