Thioredoxin-interacting protein mediates hepatic lipogenesis and inflammation via PRMT1 and PGC-1 alpha regulation in vitro and in vivo

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Title
Thioredoxin-interacting protein mediates hepatic lipogenesis and inflammation via PRMT1 and PGC-1 alpha regulation in vitro and in vivo
Author(s)
M J Park; D I Kim; S K Lim; J H Choi; J C Kim; K C Yoon; J B Lee; J H Lee; H J Han; In Pyo Choi; Hyoung-Chin Kim; S H Park
Bibliographic Citation
Journal of Hepatology, vol. 61, no. 5, pp. 1151-1157
Publication Year
2014
Abstract
Background & Aims: Non-alcoholic fatty liver disease (NAFLD) is strongly associated with obesity and type 2 diabetes. Thioredoxin-interacting protein (TXNIP) regulates the cellular redox state and metabolism and has been linked to many diseases, including diabetes. Therefore, we examined the role of TXNIP in hepatic steatosis in vitro and in vivo. Methods: Lipogenic and inflammatory proteins produced by hepatocytes treated with palmitic acid (PA) or transfected with TXNIP or Txnip siRNA were measured by Western blotting. Lipid accumulation was assessed using Oil Red O staining. Protein interactions were assessed by immunoprecipitation and proximity ligation assay. Hepatic protein levels were measured by Western blotting from wild type or Txnip-/- mice fed a high-fat diet (HFD) or chow diet. Livers from NAFLD patients were compared with normal liver by immunohistochemistry. Results: PA increased TXNIP, and inflammatory and lipogenic proteins in both AML12 and H4IIE cells. It also increased the peroxisome proliferator-activated receptor gamma co-activator-1α (PGC-1α), which mediated the expression of lipogenic markers and lipid accumulation. In addition, PA increased protein arginine methyltransferase-1 (PRMT1) and PRMT1 siRNA abolished the increase in lipogenic markers with PGC-1α. Furthermore, TXNIP interacted with PRMT1 in PA-treated hepatocytes. In vivo, levels of lipogenic proteins, inflammatory molecules, PGC-1α, and PRMT1 were increased in the livers of HFD mice compared with those fed a chow diet, and were ameliorated in HFD Txnip-/- mice. Moreover, TXNIP, PRMT1, and PGC-1α were elevated in the livers of human NAFLD patients. Conclusions: TXNIP mediates hepatic lipogenesis via PRMT1 and PGC-1α regulation and inflammation in vitro and in vivo, implying that targeting TXNIP and PRMT1 is a potential therapeutic approach for treatment of NAFLD.
Keyword
Hepatic steatosisPGC-1αPRMTTXNIP
ISSN
0168-8278
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.jhep.2014.06.032
Type
Article
Appears in Collections:
Division of Biomedical Research > Immunotherapy Research Center > 1. Journal Articles
Ochang Branch Institute > Division of National Bio-Infrastructure > Laboratory Animal Resource & Research Center > 1. Journal Articles
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