Effect of hepatic NPC1L1 on cholesterol gallstone disease and its mechanism
Pingfan Mo,
Hongtan Chen,
Xin Jiang,
Fengling Hu,
Fenming Zhang,
Guodong Shan,
Wenguo Chen,
Sha Li,
Guoqiang Xu
Affiliations
Pingfan Mo
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Hongtan Chen
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Xin Jiang
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Fengling Hu
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Fenming Zhang
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Guodong Shan
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Wenguo Chen
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Sha Li
Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Guoqiang Xu
Corresponding author. Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou 310006, Zhejiang, China.; Department of Gastroenterology, Zhejiang University School of Medicine, The First Affiliated Hospital, Hangzhou, Zhejiang 310003, China
Cholesterol gallstone disease (CGD) is associated with bile cholesterol supersaturation. The Niemann-Pick C1-like 1 (NPC1L1), the inhibitory target of ezetimibe (EZE), is a critical sterol transporter of cholesterol absorption. Intestinal NPC1L1 facilitates the absorption of cholesterol, whereas hepatic NPC1L1 promotes cholesterol uptake by hepatocytes and reduces bile cholesterol supersaturation. The potential of hepatic NPC1L1 to prevent CGD has yet to be established due to its absence in the mice model. In this study, we generated mice expressing hepatic NPC1L1 using adeno-associated virus (AAV) gene delivery. The biliary cholesterol saturations and gallstone formations were explored under chow diet and lithogenic diet (LD) with or without EZE treatment. The long-term (8-week) LD-fed AAV-mNPC1L1 mice exhibited no significant differences in biliary cholesterol saturation and gallstone formation compared to WT mice. EZE effectively prevented CGD in both WT and AAV-mNPC1L1 mice. Mechanistically, prolonged LD feeding induced the degradation of hepatic NPC1L1, whereas short-term (2-week) LD feeding preserved the expression of hepatic NPC1L1. In conclusion, our findings suggest that hepatic NPC1L1 is unable to prevent CGD, whereas EZE functions as an efficient bile cholesterol desaturator during CGD development.
