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Increased serum liver X receptor ligand oxysterols in patients with non-alcoholic fatty liver disease

Authors
  • Ikegami, Tadashi1
  • Hyogo, Hideyuki2
  • Honda, Akira1, 3
  • Miyazaki, Teruo3, 4
  • Tokushige, Katsutoshi5
  • Hashimoto, Etsuko5
  • Inui, Kazuo6
  • Matsuzaki, Yasushi1, 4
  • Tazuma, Susumu7
  • 1 Tokyo Medical University Ibaraki Medical Center, Division of Gastroenterology and Hepatology, 3-20-1 Chuo, Ami-machi, Inashiki-gun, Ibaraki, 300-0395, Japan , Inashiki-gun (Japan)
  • 2 Hiroshima University, Department of Medicine and Molecular Science, Graduate School of Biochemical Science, Hiroshima, Japan , Hiroshima (Japan)
  • 3 Tokyo Medical University Ibaraki Medical Center, Center for Collaborative Research, Inashiki-gun, Japan , Inashiki-gun (Japan)
  • 4 Tokyo Medical University, Department of Development for Community Medicine, Tokyo, Japan , Tokyo (Japan)
  • 5 Tokyo Women’s Medical University, Department of Medicine and Gastroenterology, Tokyo, Japan , Tokyo (Japan)
  • 6 Fujita Health University School of Medicine, Department of Internal Medicine, Toyoake, Japan , Toyoake (Japan)
  • 7 Hiroshima University, Department of General Medicine, Graduate School of Biochemical Science, Hiroshima, Japan , Hiroshima (Japan)
Type
Published Article
Journal
Journal of Gastroenterology
Publisher
Springer Japan
Publication Date
May 09, 2012
Volume
47
Issue
11
Pages
1257–1266
Identifiers
DOI: 10.1007/s00535-012-0585-0
Source
Springer Nature
Keywords
License
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Abstract

BackgroundThis study is a post-hoc analysis of a subset of patients who participated in our multi-institutional case-control study that evaluated the effects of pitavastatin in patients with non-alcoholic fatty liver disease (NAFLD) with hypercholesterolemia.MethodsSerum samples of fifteen patients with biopsy-proven NAFLD with dyslipidemia were investigated. Serum markers of lipid metabolism were quantified by liquid chromatography-mass spectrometry (LC–MS)/MS. These data were then compared with those of 36 sex- and age-matched healthy controls. In addition, changes in these markers produced by treatment with pitavastatin were evaluated.ResultsSerum non-cholesterol sterols, reflecting intestinal cholesterol absorption, were significantly lower in the NAFLD patients compared to the controls, and the cholesterol synthesis marker, the ratio of lathosterol to cholesterol, was not significantly different between the two groups. Serum proportions of liver X receptor α (LXRα) ligand oxysterols (ratios to cholesterol) were significantly elevated in the NAFLD patients compared to the controls. The sum of oxysterols relative to cholesterol and the homeostasis model assessment as an index of insulin resistance (HOMA-IR) were significantly correlated. The marker representing cholesterol synthesis was significantly suppressed by pitavastatin treatment, from 3 months after initiation of the treatment, and the suppression remained significant during the observation period. The markers representing cholesterol absorption were unchanged at 3 months, but had significantly increased at 12 months. Serum oxysterol levels relative to cholesterol maintained high values and did not change significantly during the 12-month period of treatment.Conclusions:We speculate that serum LXRα ligand oxysterol levels (relative to cholesterol) could be surrogate markers of insulin resistance, and that high oxysterol levels in the circulation may play an important role in the development of hepatic and peripheral insulin resistance followed by NAFLD.

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