Abstract
Osteosarcoma is the most common primary malignancy of the skeleton and is prevalent in children and adolescents. Survival rates are poor and have remained stagnant owing to chemoresistance and the high propensity to form lung metastases. In this study, we used in vivo transgenic models of c-fos oncogene-induced osteosarcoma and chondrosarcoma in addition to c-Fos-inducible systems in vitro to investigate downstream signalling pathways that regulate osteosarcoma growth and metastasis. Fgfr1 (fibroblast growth factor receptor 1) was identified as a novel c-Fos/activator protein-1(AP-1)-regulated gene. Induction of c-Fos in vitro in osteoblasts and chondroblasts caused an increase in Fgfr1 RNA and FGFR1 protein expression levels that resulted in increased and sustained activation of mitogen-activated protein kinases (MAPKs), morphological transformation and increased anchorage-independent growth in response to FGF2 ligand treatment. High levels of FGFR1 protein and activated pFRS2α signalling were observed in murine and human osteosarcomas. Pharmacological inhibition of FGFR1 signalling blocked MAPK activation and colony growth of osteosarcoma cells in vitro. Orthotopic injection in vivo of FGFR1-silenced osteosarcoma cells caused a marked twofold to fivefold decrease in spontaneous lung metastases. Similarly, inhibition of FGFR signalling in vivo with the small-molecule inhibitor AZD4547 markedly reduced the number and size of metastatic nodules. Thus deregulated FGFR signalling has an important role in osteoblast transformation and osteosarcoma formation and regulates the development of lung metastases. Our findings support the development of anti-FGFR inhibitors as potential antimetastatic therapy.
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Change history
02 June 2016
This article has been corrected since Advance Online Publication and a corrigendum is also printed in this issue
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Acknowledgements
This manuscript is dedicated to the memory of Dr Takeshi G Kashima, friend and colleague, without whom this work would not progress. We thank Dr M Albert Basson (KCL, London, UK), Dr Özge Uluçkan (CNIO, Madrid, Spain) and Dr Latifa Bakiri (CNIO, Madrid, Spain) for helpful comments and critical reading of the manuscript and Professor Larry J Suva (UAMS, Little Rock, AR, USA) for the microCT analysis. This work was supported in part by: Bone Cancer Research Trust, UK (BCRT04/07; BCRT09/08), Wellcome Trust (059344), Arthritis Research UK (G0538) and Medical Research Council (G78/4785) to AEG; 'UTE project FIMA' agreement, The Cancer Research Thematic Network of the Health Institute Carlos III (RTICC RD06/0020/0066), Spanish Ministry of Science and Innovation and European Regional Development Fund (ERDF) 'Una manera de hacer Europa' and AECC grant to FL. FL is an investigator from the I3 Program.
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Weekes, D., Kashima, T., Zandueta, C. et al. Regulation of osteosarcoma cell lung metastasis by the c-Fos/AP-1 target FGFR1. Oncogene 35, 2852–2861 (2016). https://doi.org/10.1038/onc.2015.344
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DOI: https://doi.org/10.1038/onc.2015.344
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