LY2109761 inhibits metastasis and enhances chemosensitivity in osteosarcoma MG-63 cells.

OBJECTIVE Studies have shown that transforming growth factor-beta (TGF-β) is associated with metastasis and chemoresistance of osteosarcoma. The TGF-β kinase inhibitor LY2109761 could inhibits metastasis and enhances chemosensitivity in several cancers, but its role and mechanisms in osteosarcoma (OS) is unclear. Here, we investigated the role and mechanism of LY2109761 on metastasis and chemosensitivity of OS MG-63 cells. MATERIALS AND METHODS MG-63 cells were treated with LY2109761 or/and cisplatin. The cell viability and apoptosis of MG-63 cells were detected by MTT and ELISA. Matrigel invasion assay was used to detect cell invasion in vitro. pSMAD2 and S100A4 was detected by western blot assay. Furthermore, the efficacy of LY2109761 combined with S100A4 cDNA plaismid transfection on cell viability, apoptosis and chemosensitivity to cisplatin in OS MG-63 cells was further examined. RESULTS LY2109761 was sufficient to induce apoptosis and inhibited growth of MG-63 cells in vitro. Combination with LY2109761 significantly augmented the cytotoxicity of cisplatin in MG-63 cells. LY2109761 significantly inhibited invasion of MG-63 cells in vitro. The LY2109761-induced increase in cell apoptosis and the cytotoxicity of cisplatin, and decrease in cell invasion was blocked completely when S100A4 expression was restored in the MG-63 cells by S100A4 cDNA plasmid transfection. CONCLUSIONS Our data indicate that LY2109761 suppresses OS metastasis and enhanced chemosensitivity by targeting S100A4. LY2109761 may have important implications for the development of strategies for inhibiting metastasis and overcoming OS cell resistance to chemotherapy.