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  • 标题:Relative roles of ABCG5/ABCG8 in liver and intestine
  • 本地全文:下载
  • 作者:Jin Wang ; Matthew A. Mitsche ; Dieter Lütjohann
  • 期刊名称:JLR Papers In Press
  • 印刷版ISSN:0022-2275
  • 电子版ISSN:1539-7262
  • 出版年度:2015
  • 卷号:56
  • 期号:2
  • 页码:319-330
  • DOI:10.1194/jlr.M054544
  • 语种:English
  • 出版社:American Society for Biochemistry and Molecular Biology
  • 摘要:ABCG5 (G5) and ABCG8 (G8) form a sterol transporter that acts in liver and intestine to prevent accumulation of dietary sterols. Mutations in either G5 or G8 cause sitosterolemia, a recessive disorder characterized by sterol accumulation and premature coronary atherosclerosis. Hepatic G5G8 mediates cholesterol excretion into bile, but the function and relative importance of intestinal G5G8 has not been defined. To determine the role of intestinal G5G8, we developed liver-specific ( L-G5G8−/− ), intestine-specific ( I-G5G8−/− ), and total ( G5G8−/− ) KO mice. Tissue levels of sitosterol, the most abundant plant sterol, were >90-fold higher in G5G8−/− mice than in WT animals. Expression of G5G8 only in intestine or only in liver decreased tissue sterol levels by 90% when compared with G5G8−/− animals. Biliary sterol secretion was reduced in L-G5G8−/− and G5G8−/− mice, but not in I-G5G8−/− mice. Conversely, absorption of plant sterols was increased in I-G5G8−/− and G5G8−/− mice, but not in L-G5G8−/− mice. Reverse cholesterol transport, as assessed from the fraction of intravenously administered 3H-cholesterol that appeared in feces, was reduced in G5G8−/− , I-G5G8−/− , and L-G5G8−/− mice. Thus, G5G8 expression in both the liver and intestine protects animals from sterol accumulation, and intestinal G5G8 contributes to extrahepatic cholesterol efflux in mice.
  • 关键词:cholesterol/absorption ; bile ; sterols ; transport
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