Ezetimibe normalizes metabolic defects in mice lacking ABCG5 and ABCG8

Liqing Yu, Klaus Von Bergmann, Dieter Lütjohann, Helen H. Hobbs, Jonathan C. Cohen

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The ATP binding cassette transporters ABCG5 (G5) and ABCG8 (G8) limit the accumulation of neutral sterols by restricting sterol uptake from the intestine and promoting sterol excretion into bile. Humans and mice lacking G5 and G8 (G5G8-/-) accumulate plant sterols in the blood and tissues. However, despite impaired biliary cholesterol secretion, plasma and liver cholesterol levels are lower in G5G8-/- mice than in wild-type littermates. To determine whether the observed changes in hepatic sterol metabolism were a direct result of decreased biliary sterol secretion or a metabolic consequence of the accumulation of dietary non-cholesterol sterols, we treated G5G8 -/- mice with ezetimibe, a drug that reduces the absorption of both plant- and animal-derived sterols. Ezetimibe feeding for 1 month sharply decreased sterol absorption and plasma levels of sitosterol and campesterol but increased cholesterol in both the plasma (from 60.4 to 75.2 mg/dl) and the liver (from 1.1 to 1.87 mg/g) of the ezetimibe-treated G5G8-/- mice. Paradoxically, the increase in hepatic cholesterol was associated with an increase in mRNA levels of HMG-CoA reductase and synthase. Together, these results indicate that pharmacological blockade of sterol absorption can ameliorate the deleterious metabolic effects of plant sterols even in the absence of G5 and G8.

Original languageEnglish (US)
Pages (from-to)1739-1744
Number of pages6
JournalJournal of lipid research
Volume46
Issue number8
DOIs
StatePublished - Aug 2005

Keywords

  • ATP binding cassette transporter G5
  • ATP binding cassette transporter G8
  • Bile
  • Cholesterol
  • Sitosterolemia

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Cell Biology

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