Sequential signals toward podosome formation in NIH-src cells.

Sequential signals toward podosome formation in NIH-src cells.
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DOI:
10.1083/jcb.200801042
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发表时间:
2008-07-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Takenawa T
Takenawa T
中科院分区:
其他
文献类型:
--
作者:
Oikawa T;Itoh T;Takenawa T

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Podosomes(在癌细胞中也称为invadopodia)是在各种细胞类型中发育的具有基质降解活性的富含肌动蛋白的粘附结构。尽管它们具有重要的生理学意义,但podosome形成的分子机制在很大程度上是未知的。在这项研究中,我们研究了podosome形成的分子机制。各种磷酸肌醇结合结构域的表达揭示了Src转化的NIH 3 T3(NIH-src)细胞中的podosome富含PtdIns(3,4)P2,表明这种磷酸肌醇在podosome形成中的重要作用。活细胞成像分析显示Src表达刺激PtdIns(3,4)P2积累后NIH 3 T3细胞粘着斑处的足状体形成。衔接蛋白Tks 5/FISH,这是必不可少的podosome的形成,被发现形成一个复杂的与Grb 2在粘附位点的Src依赖的方式。此外,发现N-WASP结合Tks 5/FISH的所有SH 3结构域,这促进了环状podosome的形成。这些结果表明,N-WASP-Arp 2/3信号的增强是在粘着斑处的Tks 5/FISH-Grb 2复合物的平台上完成的,其通过PtdIns(3,4)P2稳定。
Podosomes (also termed invadopodia in cancer cells) are actin-rich adhesion structures with matrix degradation activity that develop in various cell types. Despite their significant physiological importance, the molecular mechanism of podosome formation is largely unknown. In this study, we investigated the molecular mechanisms of podosome formation. The expression of various phosphoinositide-binding domains revealed that the podosomes in Src-transformed NIH3T3 (NIH-src) cells are enriched with PtdIns(3,4)P2, suggesting an important role of this phosphoinositide in podosome formation. Live-cell imaging analysis revealed that Src-expression stimulated podosome formation at focal adhesions of NIH3T3 cells after PtdIns(3,4)P2 accumulation. The adaptor protein Tks5/FISH, which is essential for podosome formation, was found to form a complex with Grb2 at adhesion sites in an Src-dependent manner. Further, it was found that N-WASP bound all SH3 domains of Tks5/FISH, which facilitated circular podosome formation. These results indicate that augmentation of the N-WASP–Arp2/3 signal was accomplished on the platform of Tks5/FISH-Grb2 complex at focal adhesions, which is stabilized by PtdIns(3,4)P2.
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