Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Reduced EGFR Level in eIF2α Phosphorylation-Deficient Hepatocytes Is Responsible for Susceptibility to Oxidative Stress

  • Kim, Mi-Jeong (School of Biological Sciences, University of Ulsan) ;
  • Choi, Woo-Gyun (School of Biological Sciences, University of Ulsan) ;
  • Ahn, Kyung-Ju (School of Biological Sciences, University of Ulsan) ;
  • Chae, In Gyeong (School of Biological Sciences, University of Ulsan) ;
  • Yu, Rina (Department of Food Science and Nutrition, University of Ulsan) ;
  • Back, Sung Hoon (School of Biological Sciences, University of Ulsan)
  • Received : 2019.08.28
  • Accepted : 2020.01.10
  • Published : 2020.03.31
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Abstract

Reactive oxygen species (ROS) play a significant role in intracellular signaling and regulation, particularly when they are maintained at physiologic levels. However, excess ROS can cause cell damage and induce cell death. We recently reported that eIF2α phosphorylation protects hepatocytes from oxidative stress and liver fibrosis induced by fructose metabolism. Here, we found that hepatocyte-specific eIF2α phosphorylation-deficient mice have significantly reduced expression of the epidermal growth factor receptor (EGFR) and altered EGFR-mediated signaling pathways. EGFR-mediated signaling pathways are important for cell proliferation, differentiation, and survival in many tissues and cell types. Therefore, we studied whether the reduced amount of EGFR is responsible for the eIF2α phosphorylation-deficient hepatocytes' vulnerability to oxidative stress. ROS such as hydrogen peroxide and superoxides induce both EGFR tyrosine phosphorylation and eIF2α phosphorylation. eIF2α phosphorylation-deficient primary hepatocytes, or EGFR knockdown cells, have decreased ROS scavenging ability compared to normal cells. Therefore, these cells are particularly susceptible to oxidative stress. However, overexpression of EGFR in these eIF2α phosphorylation-deficient primary hepatocytes increased ROS scavenging ability and alleviated ROS-mediated cell death. Therefore, we hypothesize that the reduced EGFR level in eIF2α phosphorylation-deficient hepatocytes is one of critical factors responsible for their susceptibility to oxidative stress.

Keywords

References

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