HIF-1α induction suppresses excessive lipid accumulation in alcoholic fatty liver in mice

Yasumasa Nishiyama, Nobuhito Goda, Mai Kanai, Daisuke Niwa, Kota Osanai, Yu Yamamoto, Nanami Senoo-Matsuda, Randall S. Johnson, Soichiro Miura, Yasuaki Kabe, Makoto Suematsu

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Abstract

Background & Aims: Chronic alcohol intake stimulates hepatic oxygen consumption and subsequently causes liver hypoxia, leading to activation of hypoxia inducible factor-1 (HIF-1). Although HIF-1 plays a crucial role in the metabolic switch from aerobic to anaerobic metabolism in response to hypoxia, its roles in the regulation of lipid metabolism in alcoholic fatty liver remain unknown. Methods: Wild-type and hepatocyte-specific HIF-1α-null mice were subjected to a 6% ethanol-containing liquid diet for 4 weeks, and functional effects of loss of the HIF-1α gene on lipid metabolism were examined in the liver. Results: Hepatocyte-specific HIF-1α-null mice developed severe hypertriglyceridemia with enhanced accumulation of lipids in the liver of mice exposed to a 6% ethanol-containing liquid diet for 4 weeks. Sterol regulatory element-binding protein 1c (SREBP-1c) and its downstream target acetyl-CoA carboxylase were greatly activated as the hepatic steatosis progressed, and these alterations were inversely correlated with the expression of the HIF-1-regulated gene DEC1. Overexpression of DEC1 in the mutant liver abrogated the detrimental effects of loss of HIF-1α gene on ethanol-induced fatty liver with reduced SREBP-1c expression. Conversely, co-administration of the HIF hydroxylase inhibitor dimethyloxalylglycine for the last 2 weeks improved markedly the ethanol-induced fatty liver in mice. Conclusions: The current results provide direct evidence for protective roles of HIF-1 induction in the development of ethanol-induced fatty liver via activation of the HIF-1-regulated transcriptional repressor DEC1.

Original languageEnglish
Pages (from-to)441-447
Number of pages7
JournalJournal of Hepatology
Volume56
Issue number2
DOIs
Publication statusPublished - 2012 Feb

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Keywords

  • Alcoholic fatty liver
  • DEC1
  • HIF-1
  • SREBP-1c

ASJC Scopus subject areas

  • Hepatology

Cite this

Nishiyama, Y., Goda, N., Kanai, M., Niwa, D., Osanai, K., Yamamoto, Y., Senoo-Matsuda, N., Johnson, R. S., Miura, S., Kabe, Y., & Suematsu, M. (2012). HIF-1α induction suppresses excessive lipid accumulation in alcoholic fatty liver in mice. Journal of Hepatology, 56(2), 441-447. https://doi.org/10.1016/j.jhep.2011.07.024