DOCK10-Mediated Cdc42 Activation Is Necessary for Amoeboid Invasion of Melanoma Cells

Gilles Gadea, Victoria Sanz-Moreno, Annette Self, Anna Godi, Christopher J. Marshall*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

149 Citations (Scopus)

Abstract

Background: Tumor cells can move in a three-dimensional (3D) environment in either mesenchymal-type or amoeboid modes. In mesenchymal-type movement, cells have an elongated morphology with Rac-induced protrusions at the leading edge. Amoeboid cells have high levels of actomyosin contractility, and movement is associated with deformation of the cell body through the matrix without proteolysis. Because signaling pathways that control the activation of GTPases for amoeboid movement are poorly understood, we sought to identify regulators of amoeboid movement by screening an siRNA library targeting guanine nucleotide exchange factors (GEFs) for Rho-family GTPases. Results: We identified DOCK10, a Cdc42 GEF, as a key player in amoeboid migration; accordingly, we find that expression of activated Cdc42 induces a mesenchymal-amoeboid transition and increases cell invasion. Silencing DOCK10 expression promotes conversion to mesenchymal migration and is associated with decreased MLC2 phosphorylation and increased Rac1 activation. Consequently, abrogating DOCK10 and Rac1 expression suppresses both amoeboid and mesenchymal migration and results in decreased invasion. We show that the Cdc42 effectors N-WASP and Pak2 are required for the maintenance of the rounded-amoeboid phenotype. Blocking Cdc42 results in loss of mesenchymal morphology, arguing that Cdc42 is also involved in mesenchymal morphology through different activation and effector pathways. Conclusions: Previous work has identified roles of Rho and Rac signaling in tumor cell movement, and we now elucidate novel roles of Cdc42 signaling in amoeboid and mesenchymal movement and tumor cell invasion.

Original languageEnglish
Pages (from-to)1456-1465
Number of pages10
JournalCurrent Biology
Volume18
Issue number19
DOIs
Publication statusPublished - 14 Oct 2008
Externally publishedYes

Bibliographical note

Funding Information:
We thank Imanol Arozarena for reagents, Kevin Harrington for cells, Pierfrancesco Marra and Hugh Paterson for advice, and Georgia Mavria, Pascal Peschard, and Harvey Smith for helpful comments. This work was supported by Cancer Research UK, a European Molecular Biology Organization long-term fellowship to G.G., and a Human Frontier Science Program fellowship to A.G. C.J.M. is a Gibb life fellow of Cancer Research UK.

Keywords

  • CELLBIO
  • CELLCYCLE
  • SIGNALING

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