Abstract
Vimentin is an intermediate filament protein whose expression correlates with increased metastatic disease, reduced patient survival and poor prognosis across multiple tumor types. Despite these well-characterized correlations, the molecular role of vimentin in cancer cell motility remains undefined. To approach this, we used an unbiased phosphoproteomics screen in lung cancer cell lines to discover cell motility proteins that show significant changes in phosphorylation upon vimentin depletion. We identified the guanine nucleotide exchange factor (GEF), VAV2, as having the greatest loss of phosphorylation owing to vimentin depletion. Since VAV2 serves as a GEF for the small Rho GTPase Rac1, a key player in cell motility and adhesion, we explored the vimentin-VAV2 pathway as a potential novel regulator of lung cancer cell motility. We show that VAV2 localizes to vimentin-positive focal adhesions (FAs) in lung cancer cells and complexes with vimentin and FA kinase (FAK). Vimentin loss impairs both pY142-VAV2 and downstream pY397-FAK activity showing that vimentin is critical for maintaining VAV2 and FAK activity. Importantly, vimentin depletion reduces the activity of the VAV2 target, Rac1, and a constitutively active Rac1 rescues defects in FAK and cell adhesion when vimentin or VAV2 is compromised. Based upon this data, we propose a model whereby vimentin promotes FAK stabilization through VAV2-mediated Rac1 activation. This model may explain why vimentin expressing metastatic lung cancer cells are more motile and invasive.
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Acknowledgements
This work was supported by the National Cancer Institute (1R01CA1428580) awarded to AIM and through a Ruth L Kirschstein National Research Service Award (1F32CA168112-01) awarded to LSH Research reported in this publication was supported in part by the Winship and Emory Integrated Cellular Imaging Core and NIH/NCI under award number P30CA138292. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. We would like to thank the Custom Cloning Core at Emory University for generating the mutant FAK constructs and Doris Powell in the laboratory of Paula Vertino for her technical assistance with the quantitative RT-PCR experiments. We would also like to thank Anthea Hammond for reviewing this manuscript. In addition, we thank Keith Burridge at the University of North Carolina for generously supplying us with the VAV2 plasmids.
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Havel, L., Kline, E., Salgueiro, A. et al. Vimentin regulates lung cancer cell adhesion through a VAV2–Rac1 pathway to control focal adhesion kinase activity. Oncogene 34, 1979–1990 (2015). https://doi.org/10.1038/onc.2014.123
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DOI: https://doi.org/10.1038/onc.2014.123
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