Hepatology International

, Volume 3, Issue 3, pp 490–496

The state of cholesterol metabolism in the liver of patients with primary biliary cirrhosis: the role of MDR3 expression

Authors

    • Department of Clinical Pharmacology, Faculty of Pharmaceutical SciencesFukuoka University
  • Ryoko Yada
    • Clinical Research Center, Kyushu Medical CenterNational Hospital Organization
  • Tatsuya Fujino
    • Clinical Research Center, Kyushu Medical CenterNational Hospital Organization
  • Tsuyoshi Yoshimoto
    • Department of Gastroenterology, Kyushu Medical CenterNational Hospital Organization
  • Masayoshi Yada
    • Department of Medicine and Bioregulatory Science, Graduate School of Medical SciencesKyushu University
  • Naohiko Harada
    • Department of Gastroenterology, Kyushu Medical CenterNational Hospital Organization
  • Nobito Higuchi
    • Department of Medicine and Bioregulatory Science, Graduate School of Medical SciencesKyushu University
  • Masaki Kato
    • Department of Medicine and Bioregulatory Science, Graduate School of Medical SciencesKyushu University
  • Motoyuki Kohjima
    • Department of Medicine and Bioregulatory Science, Graduate School of Medical SciencesKyushu University
  • Akinobu Taketomi
    • Department of Surgery and Science, Graduate School of Medical SciencesKyushu University
  • Yoshihiko Maehara
    • Department of Surgery and Science, Graduate School of Medical SciencesKyushu University
  • Manabu Nakashima
    • Department of Clinical Pharmacology, Faculty of Pharmaceutical SciencesFukuoka University
  • Kazuhiro Kotoh
    • Department of Medicine and Bioregulatory Science, Graduate School of Medical SciencesKyushu University
  • Makoto Nakamuta
    • Clinical Research Center, Kyushu Medical CenterNational Hospital Organization
    • Department of Gastroenterology, Kyushu Medical CenterNational Hospital Organization
Original Article

DOI: 10.1007/s12072-009-9137-y

Cite this article as:
Enjoji, M., Yada, R., Fujino, T. et al. Hepatol Int (2009) 3: 490. doi:10.1007/s12072-009-9137-y

Abstract

Aim

Because dyslipidemia, such as hypercholesterolemia, is a characteristic of primary biliary cirrhosis (PBC), hepatic lipid metabolism may be disturbed in PBC patients. We examined the expression of lipid metabolism-associated genes in PBC liver.

Methods

All of the patients examined were in stage I or II PBC and without medication. RNA was isolated from liver specimens by needle biopsies of PBC patients and controls. The expression levels of various genes were measured by real-time RT-PCR. Multidrug resistance 3 (MDR3) expression was examined immunohistochemically. Statistical correlations between the gene expression levels and indices of blood testing were calculated.

Results

The expression levels of sterol regulatory element-binding protein (SREBP) 2 and LDL receptor were significantly lower, and those of apolipoprotein B, microsomal triglyceride transfer protein, ATP-binding cassette G5, and liver X receptor α (LXRα) were significantly higher in the PBC liver than in the normal control liver. The expression levels of bile acid synthesis- and excretion-associated genes did not change, and those of farnesoid X receptor, peroxisome proliferator-activated receptor α, and SREBP-1c were similar between the PBC and normal liver. MDR3 gene expression levels in the PBC liver were more than 4-fold higher than those in the control liver. Immunohistochemically, strong canalicular staining for MDR3 was observed in the PBC liver. LXRα expression was positively correlated with MDR3 levels. Serum levels of γ-glutamyl transpeptidase (GGT) and IgM were negatively correlated with MDR3 levels.

Conclusions

Hepatocellular cholesterol metabolism was at least partially disturbed, even in the early stage of PBC. The most characteristic finding was a distinct elevation of MDR3 expression, and the MDR3 levels were negatively correlated with GGT and IgM levels.

Keywords

Primary biliary cirrhosis MDR3 LXRα Phospholipids Cholesterol

Copyright information

© Asian Pacific Association for the Study of the Liver 2009