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Dasatinib Inhibits Migration and Invasion in Diverse Human Sarcoma Cell Lines and Induces Apoptosis in Bone Sarcoma Cells Dependent on Src Kinase for Survival

¹ Gonzmart Laboratory, Sarcoma Program and ² Molecular Oncology Program, H. Lee Moffitt Cancer Center and Research Institute; ³ Department of Molecular Medicine, University of South Florida College of Medicine, Tampa, Florida; ⁴ Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, New Jersey; ⁵ Leonard M. Miller School of Medicine, University of Miami, Miami, Florida; ⁶ Department of Sarcoma Medical Oncology, M. D. Anderson Cancer Center, Houston, Texas; and ⁷ Beckman Research Institute, City of Hope National Medical Center, Duarte, California

Requests for reprints: Richard Jove, Molecular Medicine, Beckman Research Institute of the City of Hope, 1500 East Duarte Road, Duarte, CA 91010. Phone: 626-256-4673, ext. 62737; Fax: 626-256-8708; E-mail: Rjove{at}coh.org.

Sarcomas are rare malignant mesenchymal tumors for which there are limited treatment options. One potential molecular target for sarcoma treatment is the Src tyrosine kinase. Dasatinib (BMS-354825), a small-molecule inhibitor of Src kinase activity, is a promising cancer therapeutic agent with p.o. bioavailability. Dasatinib exhibits antitumor effects in cultured human cell lines derived from epithelial tumors, including prostate and lung carcinomas. However, the action of dasatinib in mesenchymally derived tumors has yet to be shown. Based on our previous findings of Src activation in human sarcomas, we evaluated the effects of dasatinib in 12 cultured human sarcoma cell lines derived from bone and soft tissue sarcomas. Dasatinib inhibited Src kinase activity at nanomolar concentrations in these sarcoma cell lines. Downstream components of Src signaling, including focal adhesion kinase and Crk-associated substrate (p130^CAS), were also inhibited at similar concentrations. This inhibition of Src signaling was accompanied by blockade of cell migration and invasion. Moreover, apoptosis was induced in the osteosarcoma and Ewing's subset of bone sarcomas at nanomolar concentrations of dasatinib. Inhibition of Src protein expression by small interfering RNA also induced apoptosis, indicating that these bone sarcoma cell lines are dependent on Src activity for survival. These results show that dasatinib inhibits migration and invasion of diverse sarcoma cell types and selectively blocks the survival of bone sarcoma cells. Therefore, dasatinib may provide therapeutic benefit by preventing the growth and metastasis of sarcomas in patients. [Cancer Res 2007;67(6):2800–8]

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