Synergistic influence of Abcb1 and Abcc2 on disposition and sterol lowering effects of ezetimibe in rats
Corresponding Author
Stefan Oswald
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany. Telephone: +49-3834-865642; Fax: +49-3834-865631.Search for more papers by this authorKaren May
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Search for more papers by this authorJuliane Rosin
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Search for more papers by this authorDieter Lütjohann
Institute of Clinical Chemistry and Pharmacology (DL), University of Bonn, Bonn, Germany
Search for more papers by this authorWerner Siegmund
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Search for more papers by this authorCorresponding Author
Stefan Oswald
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany. Telephone: +49-3834-865642; Fax: +49-3834-865631.Search for more papers by this authorKaren May
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Search for more papers by this authorJuliane Rosin
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Search for more papers by this authorDieter Lütjohann
Institute of Clinical Chemistry and Pharmacology (DL), University of Bonn, Bonn, Germany
Search for more papers by this authorWerner Siegmund
Department of Clinical Pharmacology Ernst Moritz Arndt University, Friedrich-Loeffler-Str. 23d, D-17487 Greifswald, Germany
Search for more papers by this authorAbstract
Pharmacokinetics of the sterol-lowering drug ezetimibe (EZ) is influenced by intestinal ABCB1 and ABCC2. This study in Lew.1W rats with “chemical” and genetic Abcb1 and Abcc2 deficiency was initiated to evaluate the individual contribution of both efflux carriers to the overall disposition and sterol-lowering effects of EZ. Disposition and sterol-lowering effects of EZ (5 mg/kg, 14 days) were measured in wild-type (WT) and Abcc2-deficient (Abcc2-) rats (N = 8 per group) and in animals treated with PSC833 (20 mg/kg) to generate “chemical” Abcb1-deficiency (Abcb1-, Abcb1-/Abcc2-). EZ serum levels decreased in the order WT (3.11 ± 1.09 ng/mL), Abcb1- (1.94 ± 1.10 ng/mL), Abcc2- (1.42 ± 0.42 ng/mL, p = 0.003 vs. WT), Abcb1-/Abcc2- (1.17 ± 0.53 ng/mL, p = 0.002 vs. WT) whereas the serum EZ glucuronide levels increased as follows: WT (23.2 ± 24.6 ng/mL), Abcb1- (119 ± 74.5 ng/mL, p = 0.002 vs. WT), Abcc2- (195±76.5 ng/mL, p < 0.001 vs. WT), Abcb1-/Abcc2- (676 ± 207 ng/mL, p < 0.001 vs. WT, Abcb1- and Abcc2-). Abcb1 and Abcc2 protein deficiency resulted synergistically in lower fecal but increased renal excretion of total EZ although to a much lower extent. The sterol-lowering effects of EZ were significantly correlated to serum levels of EZ. In conclusion, Abcb1 and Abcc2 deficiency leads to lower levels of the active EZ and in turn to decreased sterol-lowering effects. © 2009 Wiley-Liss, Inc. and the American Pharmacists Association J Pharm Sci 99:422–429, 2010
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