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Cancer Res. 2017 Jan 15;77(2):434-447. doi: 10.1158/0008-5472.CAN-16-2060. Epub 2016 Nov 21.

Plk4 Promotes Cancer Invasion and Metastasis through Arp2/3 Complex Regulation of the Actin Cytoskeleton.

Author information

1
Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.
2
Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
3
Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada.
4
Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.
5
Department of Pathology, University of Toronto, Toronto, Ontario, Canada.
6
Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada.
7
Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada. Carol.Swallow@sinaihealthsystem.ca.

Abstract

The polo family serine threonine kinase Plk4 has been proposed as a therapeutic target in advanced cancers based on increased expression in primary human cancers, facilitation of tumor growth in murine xenograft models, and centrosomal amplification induced by its overexpression. However, both the causal link between these phenomena and the feasibility of selective Plk4 inhibition remain unclear. Here we characterize Plk4-dependent cancer cell migration and invasion as well as local invasion and metastasis of cancer xenografts. Plk4 depletion suppressed cancer invasion and induced an epithelial phenotype in poorly differentiated breast cancer cells. In an unbiased BioID screen for Plk4 interactors, we identified members of the Arp2/3 complex and confirmed a physical and functional interaction between Plk4 and Arp2 in mediating Plk4-driven cancer cell movement. This interaction is mediated through the Plk4 Polo-box 1-Polo-box 2 domain and results in phosphorylation of Arp2 at the T237/T238 activation site, which is required for Plk4-driven cell movement. Our results validate Plk4 as a therapeutic target in cancer patients and reveal a new role for Plk4 in regulating Arp2/3-mediated actin cytoskeletal rearrangement. Cancer Res; 77(2); 434-47.

PMID:
27872092
DOI:
10.1158/0008-5472.CAN-16-2060
[Indexed for MEDLINE]
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