Bile acid-induced elevated oxidative stress in the absence of farnesoid X receptor

Masahiro Nomoto, Masaaki Miyata, Shanai Yin, Yasushi Kurata, Miki Shimada, Kouichi Yoshinari, Frank J. Gonzalez, Kokichi Suzuki, Shigeki Shibasaki, Tohru Kurosawa, Yasushi Yamazoe

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The major function of farnesoid X receptor (FXR) is to maintain bile acid and lipid homeostasis. Fxr-null mice, in which the levels of hepatic bile acid and lipid have been elevated, develop spontaneous liver tumors. We evaluated differences in hepatic bile acid and triglyceride concentrations, and in generation of oxidative stress between wild-type mice and Fxr-null mice. The hepatic levels of 8-hydroxy-2′-deoxyguanosine (8OHdG), thiobarbituric acid-reactive substance (TBARS) and hydroperoxides, oxidative stress-related genes, and nuclear factor (erythroid-2 like) factor 2 (Nrf2) protein in Fxr-null mice were significantly higher than those in wild-type mice. An increase in the hepatic bile acid concentration in Fxr-null mice fed a cholic acid (CA) diet resulted in an increase in the hepatic levels of hydroperoxides, TBARS and 8OHdG, whereas a decrease in the hepatic concentration in mice fed a diet containing ME3738 (22β-methoxyolean-12-ene-3β,24(4β)-dior) resulted in a decrease in these oxidative stress marker levels. A good correlation was observed between the hepatic bile acid concentrations and the hepatic oxidative stress marker levels, although there was no significant correlation between the hepatic triglyceride concentrations and oxidative stress. The results show that oxidative stress is spontaneously enhanced in Fxr-null mice, which may be attributable to a continuously high level of hepatic bile acids.

Original languageEnglish
Pages (from-to)172-178
Number of pages7
JournalBiological and Pharmaceutical Bulletin
Volume32
Issue number2
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • 8-hydroxy-2′-de-oxyguanosine
  • Bile acid
  • Farnesoid X receptor
  • Nuclear factor (erythroid-2 like) factor 2
  • Oxidative stress

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science

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