The fibronectin-binding integrins alpha5beta1 and alphavbeta3 differentially modulate RhoA-GTP loading, organization of cell matrix adhesions, and fibronectin fibrillogenesis.

The fibronectin-binding integrins alpha5beta1 and alphavbeta3 differentially modulate RhoA-GTP loading, organization of cell matrix adhesions, and fibronectin fibrillogenesis.
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DOI:
10.1083/jcb.200205014
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发表时间:
2002-12-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Sonnenberg A
Sonnenberg A
中科院分区:
其他
文献类型:
--
作者:
Danen EH;Sonneveld P;Brakebusch C;Fassler R;Sonnenberg A

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我们已经研究了通过α5β1或αvβ3与纤维连接蛋白结合的细胞中不同类型的细胞基质黏附的形成。在这两种情况下,细胞与纤维连接蛋白的黏附导致RhoA活性的迅速下降。然而,α5β1而不是αvβ3在细胞扩散的后期阶段支持高水平的RhoA活性,这与焦点接触转移到外周细胞突起、张力蛋白重新聚集到纤维粘连和纤维连接蛋白纤维形成有关。RhoA激活突变体的表达促进αvβ3介导的纤维形成。尽管α5β1介导的与纤维连接蛋白中心细胞结合域的黏附支持RhoA的激活,但α5β1介导的而不是αvβ3介导的焦点接触的形成需要纤维连接蛋白的其他区域。利用β1和β3亚单位的嵌合体,我们发现β1的胞外区控制着RhoA的活性。通过高水平表达β1和β3,我们表明β1介导的β3水平的控制对于焦点接触的分布是重要的。我们的发现表明,细胞上表达的纤维连接蛋白受体的模式决定了纤维连接蛋白刺激RhoA介导的细胞基质粘连组织的能力。
We have studied the formation of different types of cell matrix adhesions in cells that bind to fibronectin via either α5β1 or αvβ3. In both cases, cell adhesion to fibronectin leads to a rapid decrease in RhoA activity. However, α5β1 but not αvβ3 supports high levels of RhoA activity at later stages of cell spreading, which are associated with a translocation of focal contacts to peripheral cell protrusions, recruitment of tensin into fibrillar adhesions, and fibronectin fibrillogenesis. Expression of an activated mutant of RhoA stimulates αvβ3-mediated fibrillogenesis. Despite the fact that α5β1-mediated adhesion to the central cell-binding domain of fibronectin supports activation of RhoA, other regions of fibronectin are required for the development of α5β1-mediated but not αvβ3-mediated focal contacts. Using chimeras of β1 and β3 subunits, we find that the extracellular domain of β1 controls RhoA activity. By expressing both β1 and β3 at high levels, we show that β1-mediated control of the levels of β3 is important for the distribution of focal contacts. Our findings demonstrate that the pattern of fibronectin receptors expressed on a cell dictates the ability of fibronectin to stimulate RhoA-mediated organization of cell matrix adhesions.
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