Sayan, A. Emre, Stanford, R., Vickery, R., Grigorenko, E., Diesch, J., Kulbichi, K., Mellon, J. K., Edwards, Richard, Pal, R., Greaves, P., Jariel-Encontre, I., Piechaczyk, M., Kriajevska, M. and Dhillon, A. S.
Fra-1 controls motility of bladder cancer cells via transcriptional upregulation of the receptor tyrosine kinase AXL
Oncogene, 31, (12), . (doi:10.1038/onc.2011.336). (PMID:21822309).
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Fos-related antigen 1 (Fra-1) is a Fos family member overexpressed in several types of human cancers. Here, we report that Fra-1 is highly expressed in the muscle-invasive form of the carcinoma of the bladder (80%) and to a lesser extent in superficial bladder cancer (42%). We demonstrate that in this type of cancer Fra-1 is regulated via a C-terminal instability signal and C-terminal phosphorylation. We show that manipulation of Fra-1 expression levels in bladder cancer cell lines affects cell morphology, motility and proliferation. The gene coding for AXL tyrosine kinase is directly upregulated by Fra-1 in bladder cancer and in other cell lines. Importantly, our data demonstrate that AXL mediates the effect of Fra-1 on tumour cell motility but not on cell proliferation. We suggest that AXL may represent an attractive therapeutic target in cancers expressing high Fra-1 levels
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