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首页> 外文期刊>Journal of Cellular Physiology >High fat diet‐induced oxidative stress blocks hepatocyte nuclear factor 4α and leads to hepatic steatosis in mice
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High fat diet‐induced oxidative stress blocks hepatocyte nuclear factor 4α and leads to hepatic steatosis in mice

机译:高脂肪饮食诱导氧化应激块肝细胞的核因子4α和导致肝老鼠体内的脂肪变性

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Nonalcoholic fatty liver disease (NAFLD) is the most common form of chronic liver disease with manifestation of over‐accumulation of fat in liver. Increasing evidences indicate that NAFLD may be in part caused by malfunction of very low density lipoprotein (VLDL) secretion. Hepatocyte nuclear factor 4α (HNF4α), a nuclear receptor protein, plays an important role in sustain hepatic lipid homeostasis via transcriptional regulation of genes involved in secretion of VLDL, such as apolipoprotein B (ApoB). However, the exact functional change of HNF4α in NAFLD remains to be elucidated. In the present study, we found that high fat diet (HFD) induced cytoplasmic retention of HNF4α in hepatocytes, which led to down‐regulation of hepatic ApoB expression and its protein level in serum, as well as reduced secretion of VLDL. We further revealed that oxidative stress, elevated in fatty liver, was the key factor inducing the cytoplasmic retention of HNF4α in hepatocytes by activating protein kinase C (PKC)‐mediated phosphorylation in HNF4α. Thus, our findings reveal a novel mechanism underlying HFD‐induced fatty liver that oxidative stress impairs function of HNF4α on ApoB expression and VLDL secretion via PKC activation, eventually promoting fat accumulation in the liver. Therefore, oxidative stress/PKC/HNF4α pathway may be a novel target to treat diet‐induced fatty liver.
机译:非酒精性脂肪肝病(NAFLD)是最常见的慢性肝病表现在积累脂肪肝脏。可能会在一定程度上造成的故障很低吗密度脂蛋白(VLDL)分泌。核因子4α(HNF4α),核受体蛋白质,维持中起着重要的作用肝脂质稳态通过转录调节基因的分泌VLDL,如载脂蛋白B(飞机观测)。的确切功能改变HNF4α在非酒精性脂肪肝还有待阐明。我们发现高脂肪饮食(HFD)诱导在肝细胞胞质保留HNF4α,导致肝飞机观测量调节表达和血清的蛋白水平减少VLDL的分泌。表明氧化应激、高脂肪肝脏,是诱导的关键因素在肝细胞胞质保留HNF4α激活蛋白激酶C (PKC)的介导磷酸化在HNF4α。揭示了一个新颖的机制HFD诱导脂肪肝,氧化应激损害飞机观测表达和VLDL的函数HNF4α最终通过PKC活化分泌,促进肝脏中脂肪堆积。因此,氧化应激/ PKC HNF4α通路是一个新颖的目标治疗饮食诱导的脂肪肝脏。

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