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Therapeutic reduction of hydrophobic bile acids exposure is considered beneficial in cholestasis. The Cyp2c70 KO mice lack hydrophilic muricholic acids and have a human-like hydrophobic bile acid pool resulting in hepatobiliary injury. This study investigates if combining an apical sodium-dependent bile acid transporter inhibitor GSK2330672 (GSK) and fibroblast growth factor-15 (FGF15) overexpression, via simultaneous inhibition of bile acid synthesis and gut bile acid uptake, achieves enhanced therapeutic efficacy in alleviating hepatobiliary injury in Cyp2c70 KO mice. The effects of GSK, adeno-associated virus (AAV)-FGF15, and the combined treatment on bile acid metabolism and cholangiopathy were compared in Cyp2c70 KO mice. In female Cyp2c70 KO mice with more severe cholangiopathy than male Cyp2c70 KO mice, the combined treatment was more effective in reversing portal inflammation …