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Elife. 2017 Mar 13;6. pii: e22207. doi: 10.7554/eLife.22207.

p27Kip1 promotes invadopodia turnover and invasion through the regulation of the PAK1/Cortactin pathway.

Author information

1
INSERM UMR1037, Cancer Research Center of Toulouse, Toulouse, France.
2
Université Toulouse III Paul Sabatier, Toulouse, France.
3
CNRS ERL5294, Toulouse, France.
4
3P5 proteomics facility of the Université Paris Descartes, Inserm U1016 Institut Cochin, Sorbonne Paris Cité, Paris, France.
5
National Institute of Radiological Sciences, Chiba, Japan.

Abstract

p27Kip1 (p27) is a cyclin-CDK inhibitor and negative regulator of cell proliferation. p27 also controls other cellular processes including migration and cytoplasmic p27 can act as an oncogene. Furthermore, cytoplasmic p27 promotes invasion and metastasis, in part by promoting epithelial to mesenchymal transition. Herein, we find that p27 promotes cell invasion by binding to and regulating the activity of Cortactin, a critical regulator of invadopodia formation. p27 localizes to invadopodia and limits their number and activity. p27 promotes the interaction of Cortactin with PAK1. In turn, PAK1 promotes invadopodia turnover by phosphorylating Cortactin, and expression of Cortactin mutants for PAK-targeted sites abolishes p27's effect on invadopodia dynamics. Thus, in absence of p27, cells exhibit increased invadopodia stability due to impaired PAK1-Cortactin interaction, but their invasive capacity is reduced compared to wild-type cells. Overall, we find that p27 directly promotes cell invasion by facilitating invadopodia turnover via the Rac1/PAK1/Cortactin pathway.

KEYWORDS:

PAK; cancer biology; cell biology; cortactin; human; invadopodia; invasion; mouse; p27/Kip1

PMID:
28287395
PMCID:
PMC5388532
DOI:
10.7554/eLife.22207
[Indexed for MEDLINE]
Free PMC Article

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