Cortactin phosphorylation regulates cell invasion through a pH-dependent pathway.

Cortactin phosphorylation regulates cell invasion through a pH-dependent pathway.
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DOI:
10.1083/jcb.201103045
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发表时间:
2011-11-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Condeelis J
Condeelis J
中科院分区:
其他
文献类型:
--
作者:
Magalhaes MA;Larson DR;Mader CC;Bravo-Cordero JJ;Gil-Henn H;Oser M;Chen X;Koleske AJ;Condeelis J

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Cortactin磷酸化诱导钠-氢交换器NHE1重新聚集到内毒素,导致调节皮质素-cofilin结合和内毒素动力学的pH变化。侵袭性突起是一种侵袭性突起,具有蛋白质分解活性,在肿瘤细胞中是独有的。Cortactin磷酸化是不定足动物成熟过程中的一个关键步骤,它调节Nck 1结合和Cofilin活性。皮质素依赖的粘连蛋白调节的确切机制以及这一途径在内足动物成熟和细胞侵袭中的作用尚不完全清楚。我们提供的证据表明,皮质肌动蛋白-cofilin结合是由钠氢交换器NHE1介导的不动足局部pH变化调节的。此外,皮质蛋白酪氨酸磷酸化介导了NHE1的募集到不动蛋白隔室,在那里它局部增加了pH值,导致从皮质蛋白释放粘附素。我们表明,这种涉及皮质肌动蛋白磷酸化、局部pH升高和粘附素激活的机制调节了英多糖钠突起和收缩的动态周期,并且对3D中的细胞侵袭是必不可少的。总之,这些发现确定了一种新的依赖于pH的细胞侵袭调节。
Cortactin phosphorylation induces recruitment of the sodium-hydrogen exchanger NHE1 to invadopodia, resulting in pH changes that regulate cortactin-cofilin binding and invadopodium dynamics. Invadopodia are invasive protrusions with proteolytic activity uniquely found in tumor cells. Cortactin phosphorylation is a key step during invadopodia maturation, regulating Nck1 binding and cofilin activity. The precise mechanism of cortactin-dependent cofilin regulation and the roles of this pathway in invadopodia maturation and cell invasion are not fully understood. We provide evidence that cortactin–cofilin binding is regulated by local pH changes at invadopodia that are mediated by the sodium–hydrogen exchanger NHE1. Furthermore, cortactin tyrosine phosphorylation mediates the recruitment of NHE1 to the invadopodium compartment, where it locally increases the pH to cause the release of cofilin from cortactin. We show that this mechanism involving cortactin phosphorylation, local pH increase, and cofilin activation regulates the dynamic cycles of invadopodium protrusion and retraction and is essential for cell invasion in 3D. Together, these findings identify a novel pH-dependent regulation of cell invasion.
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