Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Augmenter of Liver Regeneration Alleviates Renal Hypoxia-Reoxygenation Injury by Regulating Mitochondrial Dynamics in Renal Tubular Epithelial Cells

  • Long, Rui-ting (Department of Nephrology, The Second Affiliated Hospital, Chongqing Medical University) ;
  • Peng, Jun-bo (Department of Nephrology, The Second Affiliated Hospital, Chongqing Medical University) ;
  • Huang, Li-li (Department of Nephrology, The Second Affiliated Hospital, Chongqing Medical University) ;
  • Jiang, Gui-ping (Department of Nephrology, The Second Affiliated Hospital, Chongqing Medical University) ;
  • Liao, Yue-juan (Department of Nephrology, The Second Affiliated Hospital, Chongqing Medical University) ;
  • Sun, Hang (Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, Department of Infectious Diseases, The Second Affiliated Hospital, Chongqing Medical University) ;
  • Hu, Yu-dong (Department of Nephrology, The Second Affiliated Hospital, Chongqing Medical University) ;
  • Liao, Xiao-hui (Department of Nephrology, The Second Affiliated Hospital, Chongqing Medical University)
  • Received : 2019.03.30
  • Accepted : 2019.11.19
  • Published : 2019.12.31
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Abstract

Mitochondria are highly dynamic organelles that constantly undergo fission and fusion processes that closely related to their function. Disruption of mitochondrial dynamics has been demonstrated in acute kidney injury (AKI), which could eventually result in cell injury and death. Previously, we reported that augmenter of liver regeneration (ALR) alleviates renal tubular epithelial cell injury. Here, we gained further insights into whether the renoprotective roles of ALR are associated with mitochondrial dynamics. Changes in mitochondrial dynamics were examined in experimental models of renal ischemia-reperfusion (IR). In a model of hypoxia-reoxygenation (HR) injury in vitro, dynamin-related protein 1 (Drp1) and mitochondrial fission process protein 1 (MTFP1), two key proteins of mitochondrial fission, were downregulated in the Lv-ALR + HR group. ALR overexpression additionally had an impact on phosphorylation of Drp1 Ser637 during AKI. The inner membrane fusion protein, Optic Atrophy 1 (OPA1), was significantly increased whereas levels of outer membrane fusion proteins Mitofusin-1 and -2 (Mfn1, Mfn2) were not affected in the Lv-ALR + HR group, compared with the control group. Furthermore, the mTOR/4E-BP1 signaling pathway was highly activated in the Lv-ALR + HR group. ALR overexpression led to suppression of HR-induced apoptosis. Our collective findings indicate that ALR gene transfection alleviates mitochondrial injury, possibly through inhibiting fission and promoting fusion of the mitochondrial inner membrane, both of which contribute to reduction of HK-2 cell apoptosis. Additionally, fission processes are potentially mediated by promoting tubular cell survival through activating the mTOR/4E-BP1 signaling pathway.

Keywords

References

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