Catalytically Inactive Lipoprotein Lipase Overexpression Increases Insulin Sensitivity in Mice

Catalytically Inactive Lipoprotein Lipase Overexpression Increases Insulin Sensitivity in Mice
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催化失活脂蛋白脂肪酶过度表达增加小鼠的胰岛素敏感性

DOI:
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发表时间:
2006
期刊:
影响因子:
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通讯作者:
Y. Saito 1
Y. Saito 1
中科院分区:
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文献类型:
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作者:
M. Shibasaki 1;H. Bujo 2;K. Takahashi 1;K. Murakami 1;H. Unoki 3;Y. Saito 1

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脂蛋白脂酶(LPL)功能的异常有助于高脂血症的发展,高脂血症是代谢综合征中观察到的特征性疾病之一。除了甘油三酯的水解活性外,LPL还通过其与细胞表面的结合能力调节各种细胞功能。在这里,我们展示了无催化活性的LPL过表达对高脂饮食(HFD)诱导的小鼠全身胰岛素敏感性降低的影响。无催化活性的G188 E-LPL与C2 C12骨骼肌细胞的结合能力与野生型LPL无显著差异。在C2 C12细胞中加入野生型或突变型LPL可增加胰岛素刺激的IRS-1磷酸化和葡萄糖摄取。喂食HFD 10周后,在胰岛素耐受性试验中,小鼠的血糖水平显著高于喂食饲料的小鼠。突变型LPL过表达小鼠(G188 E小鼠)和野生型LPL过表达小鼠(WT小鼠)注射胰岛素后的血糖水平显着降低。过表达无催化活性的LPL,以及野生型LPL,改善小鼠受损的胰岛素敏感性。这些结果表明,LPL的表达减少可能导致胰岛素抵抗,除了高血糖症,在代谢综合征。
Abnormalities in lipoprotein lipase (LPL) function contribute to the development of hypertriglyceridemia, one of the characteristic disorders observed in the metabolic syndrome. In addition to the hydrolyzing activity of triglycerides, LPL modulates various cellular functions via its binding ability to the cell surface. Here we show the effects of catalytically inactive LPL overexpression on high-fat diet (HFD)-induced decreased systemic insulin sensitivity in mice. The binding capacity of catalytically inactive G188E-LPL to C 2 C 12 skeletal muscle cells was not significantly different from that of wild type LPL. Insulin-stimulated IRS-1 phosphorylation and glucose uptake were increased by addition of wild type or mutant LPL in C 2 C 12 cells. After 10 weeks’ of HFD feeding, mice had significantly higher blood glucose levels than chow-fed mice in insulin tolerance tests. The blood glucose levels after insulin injection was significantly decreased in mutated LPL-overexpressing mice (G188E mice), as well as in wild type LPL-overexpressing mice (WT mice). Overexpression of catalytically inactive LPL, as well as wild type LPL, improved impaired insulin sensitivity in mice. These results show that decreased expression of LPL possibly causes the insulin resistance, in addition to hypertriglyceridemia, in metabolic syndrome.
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DOI: --
发表时间: 1989
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DOI: 10.1172/jci116018
发表时间: 1992
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