Fatty acid-binding protein 4 impairs the insulin-dependent nitric oxide pathway in vascular endothelial cells.

Fatty acid-binding protein 4 impairs the insulin-dependent nitric oxide pathway in vascular endothelial cells.
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DOI:
10.1186/1475-2840-11-72
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发表时间:
2012-06-18
影响因子:
9.3
通讯作者:
Masana L
Masana L
中科院分区:
医学1区
文献类型:
--
作者:
Aragonès G;Saavedra P;Heras M;Cabré A;Girona J;Masana L

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最近的研究表明,脂肪酸结合蛋白4(FABP4)血浆水平与2型糖尿病(T2D)内皮功能受损相关。在这项工作中,我们分析了FABP4对胰岛素介导的内皮细胞产生一氧化氮(NO)的影响。在人脐静脉内皮细胞(HUVECs)中,我们测量了FABP4对胰岛素介导的内皮型一氧化氮合酶(eNOS)表达和激活以及NO产生的影响。我们还探讨了外源性FABP4对胰岛素信号通路(胰岛素受体底物1(IRS1)和Akt)的影响。我们发现,eNOS的表达和激活和NO的产生显着抑制外源性FABP4在HUVECs。FABP4通过抑制IRS1和Akt的活化而诱导胰岛素介导的eNOS通路的改变。这些结果表明,FABP4诱导内皮功能障碍,通过抑制胰岛素信号通路的激活,导致eNOS激活和NO产生减少。这些发现提供了FABP4与糖尿病内皮功能受损之间的机制联系,这导致心血管风险增加。
Recent studies have shown that fatty acid-binding protein 4 (FABP4) plasma levels are associated with impaired endothelial function in type 2 diabetes (T2D). In this work, we analysed the effect of FABP4 on the insulin-mediated nitric oxide (NO) production by endothelial cells in vitro. In human umbilical vascular endothelial cells (HUVECs), we measured the effects of FABP4 on the insulin-mediated endothelial nitric oxide synthase (eNOS) expression and activation and on NO production. We also explored the impact of exogenous FABP4 on the insulin-signalling pathway (insulin receptor substrate 1 (IRS1) and Akt). We found that eNOS expression and activation and NO production are significantly inhibited by exogenous FABP4 in HUVECs. FABP4 induced an alteration of the insulin-mediated eNOS pathway by inhibiting IRS1 and Akt activation. These results suggest that FABP4 induces endothelial dysfunction by inhibiting the activation of the insulin-signalling pathway resulting in decreased eNOS activation and NO production. These findings provide a mechanistic linkage between FABP4 and impaired endothelial function in diabetes, which leads to an increased cardiovascular risk.
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