Novel role of the IGF-1 receptor in endothelial function and repair: studies in endothelium-targeted IGF-1 receptor transgenic mice.

Novel role of the IGF-1 receptor in endothelial function and repair: studies in endothelium-targeted IGF-1 receptor transgenic mice.
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DOI:
10.2337/db11-1494
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发表时间:
2012-09
期刊:
影响因子:
7.7
通讯作者:
Kearney MT
Kearney MT
中科院分区:
医学1区
文献类型:
--
作者:
Imrie H;Viswambharan H;Sukumar P;Abbas A;Cubbon RM;Yuldasheva N;Gage M;Smith J;Galloway S;Skromna A;Rashid ST;Futers TS;Xuan S;Gatenby VK;Grant PJ;Channon KM;Beech DJ;Wheatcroft SB;Kearney MT

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我们最近证明,减少胰岛素样生长因子-1受体(IGF-1 R)在内皮细胞的数量增加一氧化氮(NO)的生物利用度和内皮细胞胰岛素敏感性。在本报告中,我们的目的是研究增加IGF-1 R对内皮细胞功能和修复的影响。为了检查增加内皮中IGF-1 R的作用,我们在Tie 2启动子增强子的指导下产生了内皮中过表达人IGF-1 R的小鼠(人IGF-1 R内皮过表达小鼠[hIGFREO])。hIGFREO主动脉具有降低的基础NO生物利用度(对NG-单甲基-L-精氨酸的收缩百分比[平均(SEM)野生型106%(30%); hIGFREO 48%(10%)]; P < 0.05)。来自hIGFREO的内皮细胞具有降低的胰岛素刺激的内皮NO合酶活化(平均[SEM]野生型170% [25%],hIGFREO 58% [3%]; P = 0.04)和胰岛素刺激的NO释放(平均[SEM]野生型4,500 Au [1,000],hIGFREO 1,500 Au [700]; P < 0.05)。hIGFREO小鼠在剥脱动脉损伤后具有增强的内皮再生(平均[SEM]百分比恢复面积,野生型57% [2%],hIGFREO 47% [5%]; P < 0.05),并且增强了体外内皮细胞迁移。IGF-1 R虽然降低了NO的生物利用度,但增强了原位内皮再生。在内皮中操纵IGF-1 R可能是治疗血管生长和修复障碍的有用策略。
We recently demonstrated that reducing IGF-1 receptor (IGF-1R) numbers in the endothelium enhances nitric oxide (NO) bioavailability and endothelial cell insulin sensitivity. In the present report, we aimed to examine the effect of increasing IGF-1R on endothelial cell function and repair. To examine the effect of increasing IGF-1R in the endothelium, we generated mice overexpressing human IGF-1R in the endothelium (human IGF-1R endothelium-overexpressing mice [hIGFREO]) under direction of the Tie2 promoter enhancer. hIGFREO aorta had reduced basal NO bioavailability (percent constriction to NG-monomethyl-l-arginine [mean (SEM) wild type 106% (30%); hIGFREO 48% (10%)]; P < 0.05). Endothelial cells from hIGFREO had reduced insulin-stimulated endothelial NO synthase activation (mean [SEM] wild type 170% [25%], hIGFREO 58% [3%]; P = 0.04) and insulin-stimulated NO release (mean [SEM] wild type 4,500 AU [1,000], hIGFREO 1,500 AU [700]; P < 0.05). hIGFREO mice had enhanced endothelium regeneration after denuding arterial injury (mean [SEM] percent recovered area, wild type 57% [2%], hIGFREO 47% [5%]; P < 0.05) and enhanced endothelial cell migration in vitro. The IGF-1R, although reducing NO bioavailability, enhances in situ endothelium regeneration. Manipulating IGF-1R in the endothelium may be a useful strategy to treat disorders of vascular growth and repair.
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