Microtubules regulate focal adhesion dynamics through MAP4K4.

Microtubules regulate focal adhesion dynamics through MAP4K4.
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DOI:
10.1016/j.devcel.2014.10.025
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发表时间:
2014-12-08
期刊:
影响因子:
11.8
通讯作者:
Wu, Xiaoyang
Wu, Xiaoyang
中科院分区:
生物学1区
文献类型:
--
作者:
Yue, Jiping;Xie, Min;Gou, Xuewen;Lee, Philbert;Schneider, Michael D.;Wu, Xiaoyang

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局灶黏附(FAs)的解体允许细胞缩回和整合素脱离ECM,这是细胞运动的关键过程。MT(微管)的生长可以通过提供FA分解所需蛋白质的轨道来促进FA的周转。然而,这种FA“分解因子”的分子性质仍然难以捉摸。通过定量蛋白质组学,我们发现MAP4K4(丝裂原激活蛋白激酶激酶激酶激酶激酶4)是与MTs相关的FA调节因子。皮肤中MAP4K4的条件敲除(cKO)稳定FAs并损害表皮迁移。通过探索潜在的机制,我们进一步发现MAP4K4与MT结合蛋白EB2和Arf6特异性鸟嘌呤核苷酸交换因子(GEF) IQSEC1相关,其激活促进整合素内化。总之,我们的研究结果为FA分解提供了重要的见解,表明MTs可以通过EB2将MAP4K4传递给FA,其中MAP4K4可以通过IQSEC1激活Arf6并增强FA溶解。
Disassembly of focal adhesions (FAs) allows cell retraction and integrin detachment from the ECM, processes critical for cell movement. Growth of MT (microtubule) can promote FA turnover by serving as tracks to deliver proteins essential for FA disassembly. The molecular nature of this FA “disassembly factor”, however, remains elusive. By quantitative proteomics, we identified MAP4K4 (mitogen-activated protein kinase kinase kinase kinase 4) as a FA regulator that associates with MTs. Conditional knockout (cKO) of MAP4K4 in skin stabilizes FAs and impairs epidermal migration. By exploring underlying mechanisms, we further show that MAP4K4 associates with EB2, a MT binding protein, and IQSEC1, a guanine nucleotide exchange factor (GEF) specific for Arf6, whose activation promotes integrin internalization. Together, our findings provide critical insights into FA disassembly, suggesting that MTs can deliver MAP4K4 toward FAs through EB2, where MAP4K4 can in turn activate Arf6 via IQSEC1 and enhance FA dissolution.
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