Abstract
Metastatic cancer cells typically fail to halt migration on contact with non-cancer cells. This invasiveness is in contrast to normal mesenchymal cells that retract on contact with another cell. Why cancer cells are defective in contact inhibition of locomotion is not understood. Here, we analyse the dynamics of prostate cancer cell lines co-cultured with fibroblasts, and demonstrate that a combinatorial code of Eph receptor activation dictates whether cell migration will be contact inhibited. The unimpeded migration of metastatic PC-3 cells towards fibroblasts is dependent on activation of EphB3 and EphB4 by ephrin-B2, which we show activates Cdc42 and cell migration. Knockdown of EphB3 and EphB4 restores contact inhibition of locomotion to PC-3 cells. Conversely, homotypic collisions between two cancer cells results in contact inhibition of locomotion, mediated by EphA–Rho–Rho kinase (ROCK) signalling. Thus, the migration of cancer cells can switch from restrained to invasive, depending on the Eph-receptor profile of the cancer cell and the reciprocal ephrin ligands expressed by neighbouring cells.
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19 November 2010
In the version of this article initially published online, Fig. 4c was incorrectly labelled on the y axis. This error has been corrected in both the HTML and PDF versions of the article.
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Acknowledgements
We thank H. Ross for technical assistance and I. Hers for advice on immunoprecipitations, M. Brown for BMECs, A. Ziemiecki and A. -C. Andres for anti-EphB4, D. Wilkinson for anti-EphA4 and E. Pasquale for anti-EphB3. We thank P. Martin, N. Perkins and C. Paraskeva for critically reading the manuscript. We are grateful to J. Dovovan and NCRI/MRC ProMPT collaborative for facilitating clinical aspects of the work. This study has been approved by the Southmead Research Ethics Committee and was funded by a Wellcome Trust PhD studentship to J.B., an MRC studentship to S.K. and a Cancer Research UK project grant to C.D.N.
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J.W.A., S.K. and C.D.N. designed experiments. J.W.A. and J.C. performed the RT–PCR, J.B. performed the Cdc42-knockdown experiments, C.D.N. performed microinjection experiments and immunohistochemistry, and J.W.A. carried out all other experiments. D.G. and R.P. provided prostate tissue and J.O., J.W.A. and C.D.N. prepared and analysed prostate immunohistochemistry. J.W.A. and C.D.N. wrote the manuscript.
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Astin, J., Batson, J., Kadir, S. et al. Competition amongst Eph receptors regulates contact inhibition of locomotion and invasiveness in prostate cancer cells. Nat Cell Biol 12, 1194–1204 (2010). https://doi.org/10.1038/ncb2122
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DOI: https://doi.org/10.1038/ncb2122