uPAR-induced cell adhesion and migration: vitronectin provides the key.

uPAR-induced cell adhesion and migration: vitronectin provides the key.
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DOI:
10.1083/jcb.200612058
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发表时间:
2007-06-04
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Sidenius N
Sidenius N
中科院分区:
其他
文献类型:
--
作者:
Madsen CD;Ferraris GM;Andolfo A;Cunningham O;Sidenius N

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膜受体uPAR的表达诱导细胞形态和迁移的深刻变化,其表达与癌症的恶性表型相关。为了确定uPAR功能在这些过程中必不可少的分子相互作用,我们进行了一个完整的功能性丙氨酸扫描的uPAR在HEK 293细胞。在255种突变受体中,有34种未能诱导细胞形态的变化。值得注意的是,所有这些突变体的分子缺陷是一个特定的减少整合素非依赖性细胞结合玻连蛋白。一种膜系纤溶酶原激活物抑制剂-1,它在玻连蛋白中具有与uPAR相同的结合位点,复制uPAR诱导的变化。因此,直接的uPAR-玻连蛋白相互作用是必需的,并且足以引发细胞形态、迁移和信号转导的下游变化。总的来说,这些数据证明了一种新的机制,通过这种机制,缺乏固有信号传导能力的细胞粘附分子通过调节细胞和基质之间的接触而不需要直接的侧向蛋白质-蛋白质相互作用来引起复杂的细胞反应。
Expression of the membrane receptor uPAR induces profound changes in cell morphology and migration, and its expression correlates with the malignant phenotype of cancers. To identify the molecular interactions essential for uPAR function in these processes, we carried out a complete functional alanine scan of uPAR in HEK293 cells. Of the 255 mutant receptors characterized, 34 failed to induce changes in cell morphology. Remarkably, the molecular defect of all of these mutants was a specific reduction in integrin-independent cell binding to vitronectin. A membrane-tethered plasminogen activator inhibitor-1, which has the same binding site in vitronectin as uPAR, replicated uPAR-induced changes. A direct uPAR–vitronectin interaction is thus both required and sufficient to initiate downstream changes in cell morphology, migration, and signal transduction. Collectively these data demonstrate a novel mechanism by which a cell adhesion molecule lacking inherent signaling capability evokes complex cellular responses by modulating the contact between the cell and the matrix without the requirement for direct lateral protein–protein interactions.
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