Abstract

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 defi ned. To determine the role of intestinal G5G8, we developed liver-specifi c (L- G5G8 -/- ), intestinespecifi c ( 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 effl ux in mice. -Wang, J., M. A. Mitsche, D. Lütjohann, J. C. Cohen, X-S. Xie, and H. H. Hobbs. Relative roles of ABCG5/ABCG8 in liver and intestine. J. Lipid Res.

Original languageEnglish (US)
Pages (from-to)319-330
Number of pages12
JournalJournal of Lipid Research
Volume56
Issue number2
DOIs
StatePublished - Feb 1 2015

Fingerprint

Sterols
Liver
Intestines
Cholesterol
Phytosterols
Animals
Tissue
Feces
Bile
Lipids
Coronary Artery Disease
Mutation

Keywords

  • Bile
  • Cholesterol/absorption
  • Sterols
  • Transport

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Endocrinology

Cite this

Relative roles of ABCG5/ABCG8 in liver and intestine. / Wang, Jin; Mitsche, Matthew A.; Lütjohann, Dieter; Cohen, Jonathan C.; Xie, Xiao Song; Hobbs, Helen H.

In: Journal of Lipid Research, Vol. 56, No. 2, 01.02.2015, p. 319-330.

Research output: Contribution to journalArticle

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abstract = "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 defi ned. To determine the role of intestinal G5G8, we developed liver-specifi c (L- G5G8 -/- ), intestinespecifi c ( 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 effl ux in mice. -Wang, J., M. A. Mitsche, D. L{\"u}tjohann, J. C. Cohen, X-S. Xie, and H. H. Hobbs. Relative roles of ABCG5/ABCG8 in liver and intestine. J. Lipid Res.",
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T1 - Relative roles of ABCG5/ABCG8 in liver and intestine

AU - Wang, Jin

AU - Mitsche, Matthew A.

AU - Lütjohann, Dieter

AU - Cohen, Jonathan C.

AU - Xie, Xiao Song

AU - Hobbs, Helen H.

PY - 2015/2/1

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N2 - 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 defi ned. To determine the role of intestinal G5G8, we developed liver-specifi c (L- G5G8 -/- ), intestinespecifi c ( 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 effl ux in mice. -Wang, J., M. A. Mitsche, D. Lütjohann, J. C. Cohen, X-S. Xie, and H. H. Hobbs. Relative roles of ABCG5/ABCG8 in liver and intestine. J. Lipid Res.

AB - 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 defi ned. To determine the role of intestinal G5G8, we developed liver-specifi c (L- G5G8 -/- ), intestinespecifi c ( 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 effl ux in mice. -Wang, J., M. A. Mitsche, D. Lütjohann, J. C. Cohen, X-S. Xie, and H. H. Hobbs. Relative roles of ABCG5/ABCG8 in liver and intestine. J. Lipid Res.

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