Abstract:
BACKGROUND & AIMS:Niemann-Pick C2 (NPC2) is a lysosomal protein involved in the egress of low-density lipoprotein-derived cholesterol from lysosomes to other intracellular compartments. NPC2 has been detected in several tissues and is also secreted from the liver into bile. We have previously shown that NPC2-deficient mice fed a lithogenic diet showed reduced biliary cholesterol secretion as well as cholesterol crystal and gallstone formation. This study aimed to investigate the consequences of NPC2 hepatic overexpression on liver cholesterol metabolism, biliary lipid secretion, gallstone formation and the effect of NPC2 on cholesterol crystallization in model bile. METHODS:We generated NPC2 transgenic mice (Npc2.Tg) and fed them either chow or lithogenic diets. We studied liver cholesterol metabolism, biliary lipid secretion, bile acid composition and gallstone formation. We performed cholesterol crystallization studies in model bile using a recombinant NPC2 protein. RESULTS:No differences were observed in biliary cholesterol content or secretion between wild-type and Npc2.Tg mice fed the chow or lithogenic diets. Interestingly, Npc2.Tg mice showed an increased susceptibility to the lithogenic diet, developing more cholesterol gallstones at early times, but did not show differences in the bile acid hydrophobicity and gallbladder cholesterol saturation indices compared to wild-type mice. Finally, recombinant NPC2 decreased nucleation time in model bile. CONCLUSIONS:These results suggest that NPC2 promotes cholesterol gallstone formation by decreasing the cholesterol nucleation time, indicating a pro-nucleating function of NPC2 in bile.
journal_name
J Hepatoljournal_title
Journal of hepatologyauthors
Acuña M,González-Hódar L,Amigo L,Castro J,Morales MG,Cancino GI,Groen AK,Young J,Miquel JF,Zanlungo Sdoi
10.1016/j.jhep.2015.10.002subject
Has Abstractpub_date
2016-02-01 00:00:00pages
361-369issue
2eissn
0168-8278issn
1600-0641pii
S0168-8278(15)00669-8journal_volume
64pub_type
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abstract::This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy. ...
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pub_type: 临床试验,杂志文章,随机对照试验
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pub_type: 杂志文章,多中心研究,随机对照试验
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pub_type: 杂志文章,多中心研究
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更新日期:2020-04-01 00:00:00
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更新日期:2011-11-01 00:00:00