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• W2960348540 abstract "Galunisertib (LY2157299), a promising small‐molecule inhibitor of the transforming growth factor‐beta (TGF‐β) receptor, is currently in mono‐ and combination therapy trials for various cancers including glioblastoma, hepatocellular carcinoma and breast cancer. Using genetically modified mouse models, we investigated the roles of the multidrug efflux transporters ABCB1 and ABCG2, the OATP1A/1B uptake transporters and the drug‐metabolizing CYP3A complex in galunisertib pharmacokinetics. In vitro , galunisertib was vigorously transported by human ABCB1, and moderately by mouse Abcg2. Orally administered galunisertib (20 mg/kg) was very rapidly absorbed. Galunisertib brain‐to‐plasma ratios were increased by ~24‐fold in Abcb1a/1b −/− and Abcb1a/1b;Abcg2 −/− mice compared to wild‐type mice, but not in single Abcg2 −/− mice, whereas galunisertib oral availability was not markedly affected. However, recovery of galunisertib in the small intestinal lumen was strongly reduced in Abcb1a/1b −/− and Abcb1a/1b;Abcg2 −/− mice. Oral coadministration of the ABCB1/ABCG2 inhibitor elacridar boosted galunisertib brain accumulation in wild‐type mice to equal the levels seen in Abcb1a/1b;Abcg2 −/− mice. Oatp1a/1b deficiency did not alter oral galunisertib pharmacokinetics or liver distribution. Cyp3a −/− mice showed a 1.9‐fold higher plasma AUC 0–1 hr than wild‐type mice, but this difference disappeared over 8 hr. Also, transgenic human CYP3A4 overexpression did not significantly alter oral galunisertib pharmacokinetics. Abcb1 thus markedly restricts galunisertib brain penetration and affects its intestinal disposition, possibly through biliary excretion. Elacridar coadministration could fully inhibit both processes, without causing acute toxicity. Moreover, mouse Cyp3a, but not human CYP3A4, may eliminate galunisertib at high plasma concentrations. These insights may help to guide the further clinical development and application of galunisertib." @default.
• W2960348540 created "2019-07-23" @default.
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• W2960348540 date "2019-07-27" @default.
• W2960348540 modified "2023-10-06" @default.
• W2960348540 title "P‐glycoprotein (MDR1/ABCB1) controls brain accumulation and intestinal disposition of the novel TGF‐β signaling pathway inhibitor galunisertib" @default.
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• W2960348540 doi "https://doi.org/10.1002/ijc.32568" @default.
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