The establishment of a novel non-alcoholic steatohepatitis model accompanied with obesity and insulin resistance in mice

Life Sciences
Wei-Na CongFei Ye

Abstract

Non-alcoholic steatohepatitis (NASH) is a hepatic manifestation of the metabolic syndrome that can progress to liver cirrhosis. The major aim of this study was to establish a novel NASH mouse model accompanied by obesity and insulin resistance, then explore the molecular mechanisms of NASH and evaluate the effects of both the peroxisome proliferator-activated receptor alpha (PPARalpha) agonist fenofibrate and the PPARgamma agonist rosiglitazone in this established NASH model. The novel model was induced in C57BL/6 mice by 23 weeks of ad libitum feeding of a modified high-fat diet (mHFD), with lower methinione and choline and higher fat content. In comparison to the controls, the model animals developed pronounced obesity, dyslipidemia and insulin resistance. Marked liver lesions characterized by severe steatosis, inflammation, fibrosis, increased hepatic triglyceride content, and elevated serum alanine aminotransferase (ALT) levels were observed in the models. In this novel model, treatment with fenofibrate or rosiglitazone significantly improved insulin sensitivity and corrected dyslipidemia; however, fenofibrate was more effective than rosiglitazone in improving hepatic morphology and ALT levels. Further study showed that lon...Continue Reading

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