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http://dx.doi.org/10.5352/JLS.2017.27.2.233

Gomisin A Ameliorates Endoplasmic Reticulum Stress-induced Hepatic Steatosis  

Yun, Ye-Rang (Division of Longevity and Biofunctional Medicine, School of Korean Medicine, Pusan National University)
Jung, Myeong Ho (Division of Longevity and Biofunctional Medicine, School of Korean Medicine, Pusan National University)
Publication Information
Journal of Life Science / v.27, no.2, 2017 , pp. 233-240 More about this Journal
Abstract
Previously, we have shown that Schisandra chinensis (Turcz.) Baill. (S. chinensis) has a protective effect against endoplasmic reticulum (ER) stress-induced hepatic steatosis. Gomisin A is a bioactive phytoestrogen derived from S. chinensis. In the present study, the in vitro and in vivo effects of gomisin A on ER stress and hepatic steatosis were investigated. We quantified the expression of markers of ER stress, including glucose regulated protein 78 (GRP78), C/EBP homolog protein (CHOP), and X-box-binding protein-1 (XBP-1), in HepG2 cells treated with tunicamycin or palmitate. Tunicamycin treatment in HepG2 cells induced the expression of markers of ER stress, including GRP78, CHOP, and XBP-1c. However, treatment with gomisin A reduced the expression of markers of ER stress. These inhibitory effects were also observed in palmitate-incubated HepG2 cells. The in vivo inhibitory effects of gomisin A were assessed in mice injected with tunicamycin or fed with a high fat diet (HFD). Gomisin A reduced the expression of markers of ER stress and decreased triglyceride levels in the livers of mice after tunicamycin injection or HFD feeding. Furthermore, gomisin A decreased the expression of inflammatory genes in palmitate-incubated HepG2 cells and the liver of HFD-fed obese mice. These results suggest that gomisin A inhibits ER stress and ameliorates hepatic steatosis induced by ER stress.
Keywords
Endoplasmic reticulum (ER) stress; gomisin A; hepatic steatosis; high fat diet; inflammation;
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