4.6 Article

Impaired autophagy promotes bile acid-induced hepatic injury and accumulation of ubiquitinated proteins

期刊

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2017.11.202

关键词

Bile acid; Chenodeoxycholic acid; Cholic acid; Autophagy; Autophagosome; Bile duct ligation

资金

  1. National Research Foundation of Korea (NRF) - Korean Government (MSIT) [NRF-2015R1A5A1009701, NRF-2015R1C1A1A01054654]
  2. Konyang University Myunggok Research Fund [2014-11]

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Chronic exposure to hydrophobic bile acids such as chenodeoxycholic acid (CDCA) and cholic acid (CA) in the liver during cholestasis causes hepatotoxicity and inflammatory response. However, the detailed mechanisms regarding the role of autophagy in cholestatic hepatotoxicity remain largely unknown. Here we determined autophagic clearance in livers of bile duct-ligated mice, in which bile acids accumulate, and in human hepatoma HepG2 cells treated with CDCA and CA. The accumulation of bile acids caused defective autophagic clearance, shown by the accumulation of insoluble p62 and ubiquitinated proteins and cell death accompanied by caspase-3 processing. Hepatocytes exposed to bile acids also showed the accumulation of autophagosomes via suppressed autophagy flux. Treatment of CDCA markedly suppressed Beclin-1 expression, which exhibits a higher cytotoxicity than CA. Moreover, pharmacological or genetic inhibition of autophagy enhanced bile acid-induced cell death. Finally, in vivo, bile duct ligation led to aberrant accumulation of p62 and ubiquitinated proteins in the liver. Our data demonstrate that inhibited autophagy is an essential component of liver injury during cholestasis. (C) 2017 Elsevier Inc. All rights reserved.

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