Impaired liver regeneration in Nrf2 knockout mice: Role of ROS-mediated insulin/IGF-1 resistance

Tobias A. Beyer, Weihua Xu, Daniel Teupser, Ulrich Auf Dem Keller, Philippe Bugnon, Eberhard Hildt, Joachim Thiery, Yuet Wai Kan, Sabine Werner*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The liver is frequently challenged by surgery-induced metabolic overload, viruses or toxins, which induce the formation of reactive oxygen species. To determine the effect of oxidative stress on liver regeneration and to identify the underlying signaling pathways, we studied liver repair in mice lacking the Nrf2 transcription factor. In these animals, expression of several cytoprotective enzymes was reduced in hepatocytes, resulting in oxidative stress. After partial hepatectomy, liver regeneration was significantly delayed. Using in vitro and in vivo studies, we identified oxidative stress-mediated insulin/insulin-like growth factor resistance as an underlying mechanism. This deficiency impaired the activation of p38 mitogen-activated kinase, Akt kinase and downstream targets after hepatectomy, resulting in enhanced death and delayed proliferation of hepatocytes. Our results reveal novel roles of Nrf2 in the regulation of growth factor signaling and in tissue repair. In addition, they provide new insight into the mechanisms underlying oxidative stress-induced defects in liver regeneration. These findings may provide the basis for the development of new strategies to improve regeneration in patients with acute or chronic liver damage.

Original languageEnglish
JournalEMBO Journal
Volume27
Issue number1
Pages (from-to)212-223
ISSN0261-4189
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Insulin
  • Liver regeneration
  • Nrf2
  • Oxidative stress
  • PI3 kinase

Fingerprint

Dive into the research topics of 'Impaired liver regeneration in Nrf2 knockout mice: Role of ROS-mediated insulin/IGF-1 resistance'. Together they form a unique fingerprint.

Cite this