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Int Immunopharmacol. 2017 Aug;49:132-141. doi: 10.1016/j.intimp.2017.05.026. Epub 2017 Jun 1.

Rutin exhibits hepatoprotective effects in a mouse model of non-alcoholic fatty liver disease by reducing hepatic lipid levels and mitigating lipid-induced oxidative injuries.

Author information

1
The Guang Xing Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, PR China.
2
College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, PR China; Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310016, PR China.
3
College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, PR China.
4
Renji Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai Institution of Digestive Disease, Shanghai 200001, PR China.
5
The First Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, PR China. Electronic address: xiayongliang1@sina.com.
6
College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, PR China. Electronic address: cloudwater@zcmu.edu.cn.

Abstract

Nonalcoholic fatty liver disease (NAFLD) is characterized by excessive accumulation of hepatic lipids and oxidative injury of hepatocytes. Rutin is a natural flavonoid with significant roles in combating cellular oxidative stress and regulating lipid metabolism. The current study aims to investigate the molecular mechanisms underlying rutin's hypolipidemic and hepatoprotective effects in nonalcoholic fatty liver disease. Rutin treatment was applied to male C57BL/6 mice maintained on a high-fat diet and HepG2 cells challenged with oleic acid. Hepatic lipid accumulation was evaluated by triglyceride assay and Oil Red O staining. Oxidative hepatic injury was assessed by malondialdehyde assay, superoxide dismutase assay and reactive oxygen species assay. The expression levels of various lipogenic and lipolytic genes were determined by quantitative real-time polymerase chain reactions. In addition, liver autophagy was investigated by enzyme-linked immunosorbent assay. In both fat-challenged murine liver tissues and HepG2 cells, rutin treatment was shown to significantly lower triglyceride content and the abundance of lipid droplets. Rutin was also found to reduce cellular malondialdehyde level and restore superoxide dismutase activity in hepatocytes. Among the various lipid-related genes, rutin treatment was able to restore the expression of peroxisome proliferator-activated receptor alpha (PPAR-α) and its downstream targets, carnitine palmitoyltransferase 1 and 2 (CPT-1 and CPT-2), while suppressing those of sterol regulatory element-binding protein 1c (SREBP-1c), diglyceride acyltransfase 1 and 2 (DGAT-1 and 2), as well as acyl-CoA carboxylase (ACC). In addition, rutin was shown to repress the autophagic function of liver tissues by down-regulating key autophagy biomarkers, including tumor necrosis factor alpha (TNF-α), interleukin 1 beta (IL-1β). The experimental data demonstrated that rutin could reduce triglyceride content and mitigate oxidative injuries in fat-enriched hepatocytes. The hypolipidemic properties of rutin could be attributed to its ability to simultaneously facilitate fatty acid metabolism and inhibit lipogenesis.

KEYWORDS:

Autophagy; Lipid synthesis and metabolism; Oleic acid; Rutin

PMID:
28577437
DOI:
10.1016/j.intimp.2017.05.026
[Indexed for MEDLINE]

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