Journal
CANCER RESEARCH
Volume 71, Issue 1, Pages 175-184Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-10-2651
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Funding
- National Institutes of Health, National Cancer Institute [R01CA69158]
- U.S. Army Medical Research and Materiel Command, Department of Defense [0410920]
- INSERM
- Ligue Nationale Contre le Cancer (LNCC, Comite des Yvelines)
- Canceropole Ile-de-France
- INCa, France [PLBIO 08-0126]
- Fondation pour la Recherche Medicale (France)
- NATIONAL CANCER INSTITUTE [R01CA069158] Funding Source: NIH RePORTER
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Melanoma often metastasizes to bone where it is exposed to high concentrations of TGF-beta. Constitutive Smad signaling occurs in human melanoma. Because TGF-beta promotes metastases to bone by several types of solid tumors including breast cancer, we hypothesized that pharmacologic blockade of the TGF-beta signaling pathway may interfere with the capacity of melanoma cells to metastasize to bone. In this study, we tested the effect of a small molecule inhibitor of TGF-beta receptor I kinase (T beta RI), SD-208, on various parameters affecting the development and progression of melanoma, both in vitro and in a mouse model of human melanoma bone metastasis. In melanoma cell lines, SD-208 blocked TGF-beta induction of Smad3 phosphorylation, Smad3/4-specific transcription, Matrigel invasion and expression of the TGF-beta target genes PTHrP, IL-11, CTGF, and RUNX2. To assess effects of SD-208 on melanoma development and metastasis, nude mice were inoculated with 1205Lu melanoma cells into the left cardiac ventricle and drug was administered by oral gavage on prevention or treatment protocols. SD-208 (60 mg/kg/d), started 2 days before tumor inoculation prevented the development of osteolytic bone metastases compared with vehicle. In mice with established bone metastases, the size of osteolytic lesions was significantly reduced after 4 weeks treatment with SD-208 compared with vehicle-treated mice. Our results demonstrate that therapeutic targeting of TGF-beta may prevent the development of melanoma bone metastases and decrease the progression of established osteolytic lesions. Cancer Res; 71(1); 175-84. (C) 2010 AACR.
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