Regulation of β-adrenergic receptor trafficking and lung microvascular endothelial cell permeability by Rab5 GTPase.

Regulation of β-adrenergic receptor trafficking and lung microvascular endothelial cell permeability by Rab5 GTPase.
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Rab5 GTPase 调节β-肾上腺素能受体贩运和肺微血管内皮细胞通透性

DOI:
10.7150/ijbs.12045
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发表时间:
2015
影响因子:
9.2
通讯作者:
Wang G
Wang G
中科院分区:
生物学2区
文献类型:
--
作者:
Yang J;Sun H;Zhang J;Hu M;Wang J;Wu G;Wang G

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Rab 5 GT3调节细胞表面受体的运输,包括G蛋白偶联的β-肾上腺素能受体(β-AR)。在此,我们确定了Rab 5在调节肺微血管内皮细胞(LMEC)中β-AR的内化以及维持内皮细胞屏障的完整性和通透性中的作用。我们的数据表明,脂多糖(LPS)处理破坏了LMEC屏障功能,并减少了β-AR的细胞表面表达。此外,β-AR,特别是β2-AR的活化能够保护LMEC的通透性免受LPS损伤。此外,siRNA介导的Rab 5敲低抑制了β-AR的基础和激动剂引起的内化,因此,增强了受体的细胞表面表达和受体介导的ERK 1/2活化。重要的是,Rab 5的敲低不仅抑制了LPS诱导的对β-AR的作用,而且保护了LMEC单层通透性。总之,这些数据提供了强有力的证据,表明Rab 5介导的β-AR内化在LMEC的功能调节中起关键作用。
Rab5 GTPase modulates the trafficking of the cell surface receptors, including G protein-coupled β-adrenergic receptors (β-ARs). Here, we have determined the role of Rab5 in regulating the internalization of β-ARs in lung microvascular endothelial cells (LMECs) and in maintaining the integrity and permeability of endothelial cell barrier. Our data demonstrate that lipopolysaccharide (LPS) treatment disrupts LMEC barrier function and reduces the cell surface expression of β-ARs. Furthermore, the activation of β-ARs, particularly β2-AR, is able to protect the LMEC permeability from LPS injury. Moreover, siRNA-mediated knockdown of Rab5 inhibits both the basal and agonist-provoked internalization of β-ARs, therefore, enhancing the cell surface expression of the receptors and receptor-mediated ERK1/2 activation. Importantly, knockdown of Rab5 not only inhibits the LPS-induced effects on β-ARs but also protects the LMEC monolayer permeability. All together, these data provide strong evidence indicating a crucial role of Rab5-mediated internalization of β-ARs in functional regulation of LMECs.
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