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
中科院分区:
文献类型:
--
作者:
Chin YR;Toker A
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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