Nonalcoholic fatty liver disease (NAFLD), which is characterized by aberrant accumulation of intrahepatic triglycerides and lipid droplets (LDs) in the liver cells, is becoming increasingly prevalent at an alarming rate worldwide. LDs can be consumed by either hydrolysis or autophagy, which is shown to be of importance in the regulation of hepatic lipid metabolism. We have shown that deficiency of pleckstrin homology domain-containing casein kinase 2 interacting protein-1 (CKIP-1), a scaffold protein that interacts with various proteins in multiple signal pathways, in mice aggravates high-fat diet induced fatty liver. However, its underlying mechanisms remain largely unknown. In this study, we found that the mRNA and protein levels of CKIP-1 decreased dramatically in steatotic HepG2 cells induced by oleic acid (OA) treatment. Coincidently, hepatic autophagy was also dynamically regulated in steatotic HepG2 cells. In addition, overexpression of CKIP-1 activated autophagy by suppression of Akt/mTOR signaling, which in turn reduced lipid accumulation. Moreover, these phenomena were reversed in CKIP-1-shRNA transfected steatotic hepatocytes. To further evaluate the potential role of CKIP-1 in autophagy, we determined the level of autophagy related proteins in CKIP-1 knockout mice. These results supported our findings in vitro. In summary, we found CKIP-1 to be a positive regulator of hepatic autophagy and a promising therapeutic target for treatment of NAFLD.
基金:
National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [81570515]; Scientific Research Common Program of Beijing Municipal Commission of EducationBeijing Municipal Commission of Education [KM201810025022]; Beijing Municipal Science & Technology CommissionBeijing Municipal Science & Technology Commission [Z181100001718107]; Digestive Medical Coordinated Development Center of Beijing Hospitals Authority [xxt-09]
第一作者机构:[1]Capital Med Univ, Beijing Tongren Hosp, Dept Gastroenterol, Beijing 100730, Peoples R China
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推荐引用方式(GB/T 7714):
Li Li,Xie Ping,Lin Wenjun,et al.CKIP-1 augments autophagy in steatotic hepatocytes by inhibiting Akt/mTOR signal pathway[J].EXPERIMENTAL CELL RESEARCH.2020,397(1):doi:10.1016/j.yexcr.2020.112341.
APA:
Li, Li,Xie, Ping,Lin, Wenjun,Liu, Jinsheng,Chen, Jing...&Zhan, Yutao.(2020).CKIP-1 augments autophagy in steatotic hepatocytes by inhibiting Akt/mTOR signal pathway.EXPERIMENTAL CELL RESEARCH,397,(1)
MLA:
Li, Li,et al."CKIP-1 augments autophagy in steatotic hepatocytes by inhibiting Akt/mTOR signal pathway".EXPERIMENTAL CELL RESEARCH 397..1(2020)