Endothelial PGC-1α mediates vascular dysfunction in diabetes.

Endothelial PGC-1α mediates vascular dysfunction in diabetes.
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DOI:
10.1016/j.cmet.2013.12.014
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发表时间:
2014-02-04
期刊:
影响因子:
29
通讯作者:
Arany Z
Arany Z
中科院分区:
生物学1区
文献类型:
--
作者:
Sawada N;Jiang A;Takizawa F;Safdar A;Manika A;Tesmenitsky Y;Kang KT;Bischoff J;Kalwa H;Sartoretto JL;Kamei Y;Benjamin LE;Watada H;Ogawa Y;Higashikuni Y;Kessinger CW;Jaffer FA;Michel T;Sata M;Croce K;Tanaka R;Arany Z

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内皮功能障碍是糖尿病的主要标志。转录辅激活因子PGC-1α是一种强大的代谢调节因子,但其在内皮细胞中的作用仍知之甚少。我们发现糖尿病啮齿类动物和人类的内皮细胞PGC-1α表达较高,并且PGC-1α在细胞培养和体内血管生成中有力地阻断内皮细胞迁移。在机制上,PGC-1α诱导Notch信号传导,减弱Rac/Akt/eNOS信号传导的激活,并使内皮细胞对已建立的血管生成因子无反应。PGC-1α在内皮中的转基因过表达模拟多种糖尿病表型,包括颈动脉损伤后异常再内皮化、伤口愈合迟钝和后肢缺血后血流恢复减少。相反,内皮PGC-1α的缺失挽救了1型和2型糖尿病中观察到的钝性伤口愈合和后肢缺血的恢复。因此,内皮PGC-1α有效抑制内皮功能和血管生成,并且内皮PGC-1α的诱导导致糖尿病血管功能障碍的多个方面。
Endothelial dysfunction is a central hallmark of diabetes. The transcriptional coactivator PGC-1α is a powerful regulator of metabolism, but its role in endothelial cells remains poorly understood. We show here that endothelial PGC-1α expression is high in diabetic rodents and humans and that PGC-1α powerfully blocks endothelial migration in cell culture and vasculogenesis in vivo. Mechanistically, PGC-1α induces Notch signaling, blunts activation of Rac/Akt/eNOS signaling, and renders endothelial cells unresponsive to established angiogenic factors. Transgenic overexpression of PGC-1α in the endothelium mimics multiple diabetic phenotypes, including aberrant re-endothelialization after carotid injury, blunted wound healing, and reduced blood flow recovery after hindlimb ischemia. Conversely, deletion of endothelial PGC-1α rescues the blunted wound healing and recovery from hindlimb ischemia seen in type 1 and type 2 diabetes. Endothelial PGC-1α thus potently inhibits endothelial function and angiogenesis, and induction of endothelial PGC-1α contributes to multiple aspects of vascular dysfunction in diabetes.
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