The actin-bundling protein palladin is an Akt1-specific substrate that regulates breast cancer cell migration.

The actin-bundling protein palladin is an Akt1-specific substrate that regulates breast cancer cell migration.
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DOI:
10.1016/j.molcel.2010.02.031
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发表时间:
2010-05-14
期刊:
影响因子:
16
通讯作者:
Toker A
Toker A
中科院分区:
生物学1区
文献类型:
--
作者:
Chin YR;Toker A

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磷酸肌醇 3-激酶 (PI 3-K) 信号通路在癌症中经常失调。 PI 3-K 下游的 Akt1 和 Akt2 在乳腺癌侵袭性迁移导致转移性播散中发挥相反的作用。在这里,我们鉴定出 Palladin(一种肌动蛋白相关蛋白)作为 Akt1 特异性底物,可调节乳腺癌细胞侵袭性迁移。 Akt1(而非 Akt2)在 S507 处磷酸化 palladin,该结构域对 F-肌动蛋白捆绑至关重要。 Palladin 的下调会增强乳腺癌细胞的迁移和侵袭,并在 3D 培养物中诱导异常的分支形态发生。 Palladin 在 S507 处的磷酸化是 Akt1 介导的乳腺癌细胞迁移抑制所必需的,也是导致维持有组织的肌动蛋白细胞骨架的 F-肌动蛋白捆绑所必需的。这些发现确定 Palladin 是一种 Akt1 特异性底物,可调节细胞运动,并提供一种分子机制来解释 Akt 亚型在乳腺癌细胞信号传导至细胞迁移中的功能差异。
The phosphoinositide 3-kinase (PI 3-K) signaling pathway is frequently deregulated in cancer. Downstream of PI 3-K, Akt1 and Akt2 have opposing roles in breast cancer invasive migration leading to metastatic dissemination. Here we identify palladin, an actin-associated protein, as an Akt1-specific substrate that modulates breast cancer cell invasive migration. Akt1, but not Akt2, phosphorylates palladin at S507 in a domain that is critical for F-actin bundling. Downregulation of palladin enhances migration and invasion of breast cancer cells and induces abnormal branching morphogenesis in 3D cultures. Palladin phosphorylation at S507 is required for Akt1-mediated inhibition of breast cancer cell migration and also for F-actin bundling leading to the maintenance of an organized actin cytoskeleton. These findings identify palladin as an Akt1-specific substrate that regulates cell motility and provide a molecular mechanism that accounts for the functional distinction between Akt isoforms in breast cancer cell signaling to cell migration.
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