The Scap/SREBP pathway is essential for developing diabetic fatty liver and carbohydrate-induced hypertriglyceridemia in animals.

The Scap/SREBP pathway is essential for developing diabetic fatty liver and carbohydrate-induced hypertriglyceridemia in animals.
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DOI:
10.1016/j.cmet.2011.12.017
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发表时间:
2012-02-08
期刊:
影响因子:
29
通讯作者:
Horton JD
Horton JD
中科院分区:
生物学1区
文献类型:
--
作者:
Moon YA;Liang G;Xie X;Frank-Kamenetsky M;Fitzgerald K;Koteliansky V;Brown MS;Goldstein JL;Horton JD

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胰岛素抵抗导致高脂血症和肝脂肪变性,并与SREBP-1c(一种激活脂肪酸合成的转录因子)增加相关。在这里,我们表明,脂肪变性的胰岛素抵抗的ob/ob小鼠被废除的Scap,一个护送蛋白产生所有三个SREBP的核亚型所必需的删除。Scap的缺失减少了脂质的合成,防止了脂肪肝的发生,尽管有持续的肥胖、高胰岛素血症和高血糖症。Scap缺乏也可以防止高脂饮食小鼠的脂肪变性。当使用siRNA沉默蔗糖喂养的仓鼠肝脏中的Scap时,脂肪变性也得到了预防,这是一种饮食诱导的脂肪变性和高脂血症模型。这种沉默减少了所有三个核SREBP,减少脂质生物合成和废除蔗糖诱导的高脂血症。这些结果表明,SREBP激活是糖尿病肝脂肪变性和碳水化合物诱导的高甘油三酯血症的发展所必需的,但不是胰岛素抵抗。抑制SREBP活化具有治疗高脂血症和脂肪肝疾病的治疗潜力。
Insulin resistance leads to hypertriglyceridemia and hepatic steatosis and is associated with increased SREBP-1c, a transcription factor that activates fatty acid synthesis. Here, we show that steatosis in insulin-resistant ob/ob mice was abolished by deletion of Scap, an escort protein necessary for generating nuclear isoforms of all three SREBPs. Scap deletion reduced lipid synthesis and prevented fatty livers despite persistent obesity, hyperinsulinemia, and hyperglycemia. Scap deficiency also prevented steatosis in mice fed high-fat diets. Steatosis was also prevented when siRNAs were used to silence Scap in livers of sucrose-fed hamsters, a model of diet-induced steatosis and hypertriglyceridemia. This silencing reduced all three nuclear SREBPs, decreasing lipid biosynthesis and abolishing sucrose-induced hypertriglyceridemia. These results demonstrate that SREBP activation is essential for development of diabetic hepatic steatosis and carbohydrate-induced hypertriglyceridemia, but not insulin resistance. Inhibition of SREBP activation has therapeutic potential for treatment of hypertriglyceridemia and fatty liver disease.
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