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Osthol attenuates hepatic steatosis via decreased triglyceride synthesis not by insulin resistance

World Journal of Gastroenterology 2014年第33期20卷 11753-11761页

作者： Ho Hyun Nam Dae Won Jun Hye Joon Jeon Jai Sun Lee Waqar Khalid Saeed Eun Kyung Kim Department of Translational Medicine Hanyang University Graduate School of Biomedical Science and Engineering Seoul 133-791 South Korea Department of Internal Medicine Hanyang University School of Medicine Seoul 133-791 South Korea Department of Pathology Eulji University College of Medicine Seoul 139-872 South Korea

AIM: To evaluate the effects of osthol on intrahepatic fat synthesis, β-oxidation, inflammation, and insulin resistance by multifaceted ***: Sprague-Dawley rats(n = 30) were randomly divided into control, non-alcoholic fatty liver disease(NAFLD), and osthol groups. NAFLD and osthol groups were fed with a high-fat diet for 14 wk. After 8 wk of the high-fat diet, the osthol group also received osthol 20 mg/kg orally 5 times/wk. To assess the insulin resistance, oral glucose tolerance was performed at the end of 14 wk. Immunohistochemical(4-HNE, F4/80) and hematoxylin and eosin(HE) staining wereperformed on liver tissue extracts after animal sacrifice at 14 wk. SREBP1 c, FAS, SCD-1, PPAR-α, CROT, MCP-1, IRS-1, and IRS-2 mRNA expressions were assessed with reverse transcription-polymerase chain ***: HE staining revealed that, compared with the NAFLD group, the osthol group showed significantly decreased intrahepatic fat content(39.4% vs 21.0%; P = 0.021). SREBP1 c expression in the NAFLD group increased compared to controls(P = 0.0001), while osthol treatment decreased SREBP1 c expression compared with the NAFLD group(P = 0.0059). In the osthol group, intrahepatic FAS and SCD-1, which act downstream of SREBP1 c, decreased significantly compared with the NAFLD group. Moreover, PPAR-α expression in the osthol group was also significantly higher than in the NAFLD group(P = 0.0147).CONCLUSION: Osthol treatment attenuated liver steatosis by decreasing de novo liver triglyceride synthesis and had nominal effects on insulin resistance and liver inflammation.

关键词： Osthol Non-alcoholic fatty liver disease ste-rol r

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