Abstract
The most damaging change during cancer progression is the switch from a locally growing tumour to a metastatic killer. This switch is believed to involve numerous alterations that allow tumour cells to complete the complex series of events needed for metastasis1. Relatively few genes have been implicated in these events2,3,4,5. Here we use an in vivo selection scheme to select highly metastatic melanoma cells. By analysing these cells on DNA arrays, we define a pattern of gene expression that correlates with progression to a metastatic phenotype. In particular, we show enhanced expression of several genes involved in extracellular matrix assembly and of a second set of genes that regulate, either directly or indirectly, the actin-based cytoskeleton. One of these, the small GTPase RhoC, enhances metastasis when overexpressed, whereas a dominant-negative Rho inhibits metastasis. Analysis of the phenotype of cells expressing dominant-negative Rho or RhoC indicates that RhoC is important in tumour cell invasion. The genomic approach allows us to identify families of genes involved in a process, not just single genes, and can indicate which molecular and cellular events might be important in complex biological processes such as metastasis.
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Acknowledgements
We thank C. Huard, C. Whittaker, S. Robinson, J. Lively, D. Hirsch, D. Crowley and P. Tamayo for technical assistance and advice, and H. Lodish, G. Nolan and J. Fidler, for reagents. This work was supported in part by grants from the National Cancer Institute (to R.O.H), Affymetrix, Inc., Bristol-Myers Squibb and Millenium Pharmaceuticals (to E.S.L.), and a Merck/MIT postdoctoral fellowship (to E.A.C.). R.O.H. is an investigator and E.A.C. was an associate of the Howard Hughes Medical Institute.
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Clark, E., Golub, T., Lander, E. et al. Genomic analysis of metastasis reveals an essential role for RhoC. Nature 406, 532–535 (2000). https://doi.org/10.1038/35020106
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