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• W2107948907 abstract "The hepatic pharmacokinetics of five selected cationic drugs (propranolol, labetalol, metoprolol, antipyrine, and atenolol) was studied in the liver from control rats and from those with high-fat emulsion-induced nonalcoholic steatohepatitis (NASH). Studies were undertaken using an in situ-perfused rat liver and multiple indicator dilution, and outflow data were analyzed with a physiologically based organ pharmacokinetic model. Hepatic extraction (<i>E</i>) was significantly lower in the NASH model, and lipophilicity was the main solute structural determinant of the observed differences in intrinsic elimination clearance (CL_int) and permeability-surface area product (PS) with p<i>K</i>_a defining the extent of sequestration in the liver [apparent distribution ratio (<i>K</i>_v)]. The main pathophysiological determinants were liver fibrosis, leading to a decreased PS, liver fat causing an increase in <i>K</i>_v, and an increase in both total liver cytochrome P450 (P450) concentration and P450 isoform expression for <i>Cyp3a2</i> and <i>Cyp2d2</i>, causing an increase CL_int in NASH rat livers compared with control livers. Changes in hepatic pharmacokinetics (PS, <i>K</i>_v, CL_int, and <i>E</i> ratio) as a result of NASH were related to the physicochemical properties of drugs (lipophilicity or p<i>K</i>_a) and hepatic histopathological changes (fibrosis index, steatosis index, and P450 concentration) by stepwise regression analysis. Thus, it appears that in NASH, counteracting mechanisms to facilitate hepatic removal are created in NASH-induced P450 expression, whereas NASH-induced fibrosis and steatohepatitis inhibit <i>E</i> by decreasing hepatocyte permeability through fibrosis and hepatic sequestration." @default.
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• W2107948907 date "2011-01-18" @default.
• W2107948907 modified "2023-09-27" @default.
• W2107948907 title "Hepatic Pharmacokinetics of Cationic Drugs in a High-Fat Emulsion-Induced Rat Model of Nonalcoholic Steatohepatitis" @default.
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• W2107948907 doi "https://doi.org/10.1124/dmd.110.036806" @default.
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