Lipid-induced oxidative stress causes steatohepatitis in mice fed an atherogenic diet

脂肪性肝炎 氧化应激 内科学 内分泌学 脂肪肝 化学 氧化磷酸化 脂质积聚 医学 生物化学 疾病
作者
Naoto Matsuzawa,Toshinari Takamura,Seiichiro Kurita,Hirofumi Misu,Tsuguhito Ota,Hitoshi Ando,Masayoshi Yokoyama,Masao Honda,Yoh Zen,Yasuni Nakanuma,Ken–ichi Miyamoto,Shuichi Kaneko
出处
期刊:Hepatology [Lippincott Williams & Wilkins]
卷期号:46 (5): 1392-1403 被引量:503
标识
DOI:10.1002/hep.21874
摘要

Recently, nonalcoholic steatohepatitis (NASH) was found to be correlated with cardiovascular disease events independently of the metabolic syndrome. The aim of this study was to investigate whether an atherogenic (Ath) diet induces the pathology of steatohepatitis necessary for the diagnosis of human NASH and how cholesterol and triglyceride alter the hepatic gene expression profiles responsible for oxidative stress. We investigated the liver pathology and plasma and hepatic lipids of mice fed the Ath diet. The hepatic gene expression profile was examined with microarrays and real-time polymerase chain reactions. The Ath diet induced dyslipidemia, lipid peroxidation, and stellate cell activation in the liver and finally caused precirrhotic steatohepatitis after 24 weeks. Cellular ballooning, a necessary histological feature defining human NASH, was observed in contrast to existing animal models. The addition of a high-fat component to the Ath diet caused hepatic insulin resistance and further accelerated the pathology of steatohepatitis. A global gene expression analysis revealed that the Ath diet up-regulated the hepatic expression levels of genes for fatty acid synthesis, oxidative stress, inflammation, and fibrogenesis, which were further accelerated by the addition of a high-fat component. Conversely, the high-fat component down-regulated the hepatic gene expression of antioxidant enzymes and might have increased oxidative stress. Conclusion: The Ath diet induces oxidative stress and steatohepatitis with cellular ballooning. The high-fat component induces insulin resistance, down-regulates genes for antioxidant enzymes, and further aggravates the steatohepatitis. This model suggests the critical role of lipids in causing oxidative stress and insulin resistance leading to steatohepatitis.
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