FGF regulates TGF-β signaling and endothelial-to-mesenchymal transition via control of let-7 miRNA expression.

FGF regulates TGF-β signaling and endothelial-to-mesenchymal transition via control of let-7 miRNA expression.
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DOI:
10.1016/j.celrep.2012.10.021
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发表时间:
2012-12-27
期刊:
影响因子:
8.8
通讯作者:
Simons M
Simons M
中科院分区:
生物学1区
文献类型:
--
作者:
Chen PY;Qin L;Barnes C;Charisse K;Yi T;Zhang X;Ali R;Medina PP;Yu J;Slack FJ;Anderson DG;Kotelianski V;Wang F;Tellides G;Simons M

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正常内皮功能的维持对于血管功能的各个方面都是至关重要的,但其调节却知之甚少。在这项研究中,我们表明,基线FGF信号传导到内皮的破坏导致let-7 miRNA水平的急剧降低,这反过来增加了TGFβ配体和受体的表达以及TGFβ信号传导的激活,导致内皮向间充质转化(Endo-MT)。我们进一步发现Endo-MT是小鼠移植动脉病模型中新生内膜形成和排斥人类移植病变的重要驱动因素。内皮FGF信号输入的下降是由于FGF抗性状态的出现,其特征在于FGF信号级联的关键组分的表达和活化的炎症依赖性减少。这些结果确立了FGF信号传导作为维持内皮稳态的关键因素,并指出了Endo-MT在血管病理学中的意想不到的作用。
Maintenance of normal endothelial function is critical to various aspects of blood vessel function but its regulation is poorly understood. In this study we show that disruption of baseline FGF signaling to the endothelium leads to a dramatic reduction in let-7 miRNA levels that in turns increases expression of TGFβ ligands and receptors and activation of TGFβ signaling leading to endothelial-to-mesenchymal transition (Endo-MT). We further find that Endo-MT is an important driver of neointima formation in a murine transplant arteriopathy model and in rejecting human transplants lesions. The decline in endothelial FGF signaling input is due to the appearance of an FGF resistance state that is characterized by inflammation-dependent reduction in expression and activation of key components of the FGF signaling cascade. These results establish FGF signaling as a critical factor in maintenance of endothelial homeostasis and point to an unexpected role of Endo-MT in vascular pathology.
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