Abstract
New drugs with anti-tumor activity, also able to modify the expression of selected molecules, are under evaluation in breast cancer which is becoming resistant to conventional treatment, or in metastatic disease. The sodium-iodide symporter (NIS), which mediates iodide uptake into thyroid cells, and is the molecular basis of radioiodine imaging and therapy in thyroid cancer, is also expressed in a large portion of breast tumors. Since NIS expression in breast cancer is not sufficient for a significant iodide uptake, drugs able to induce its expression and correct function are under evaluation. In the present study, we report for the first time that the pan-deacetylase (DAC) inhibitor LBH589 (panobinostat) significantly induced NIS, both as mRNA and as protein, through the increase of NIS promoter activity, with the final consequence of obtaining a significant up-take of iodide in MCF7, T47D, and MDA-MB231 breast cancer cells. Moreover, we observed that LBH589 causes a significant reduction in cell viability of estrogen-sensitive and -insensitive breast cancer cells within nanomolar range. The anti-tumor effect of LBH589 is sustained by apoptosis induction and cell cycle arrest in G2/M. In conclusion, our data suggest that LBH589 might be a powerful tool in the management of breast cancer due to its multiple effects and support a potential application of LBH589 in the diagnosis and treatment of this disease.
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Acknowledgments
We thank Novartis Pharma AG, Basel, Switzerland for providing us LBH589; Giuseppe Damante, Dipartimento di Scienze e Tecnologie Biomediche, Policlinico Universitario di Udine, Udine, Italy, for providing us with the luc-NIS construct; Daniela Taverna and Alessandra Solero, Dipartimento di Scienze Oncologiche, Università di Torino and M. B. C., Torino, Italy, for helping us with luciferase experiments. This study was supported by the Project “Alfieri 2007”, Fondazione CRT, Torino, the Special Project “Oncology”, Compagnia San Paolo, Torino, by MIUR and by Regione Piemonte to Giuseppe Boccuzzi.
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Fortunati, N., Catalano, M.G., Marano, F. et al. The pan-DAC inhibitor LBH589 is a multi-functional agent in breast cancer cells: cytotoxic drug and inducer of sodium-iodide symporter (NIS). Breast Cancer Res Treat 124, 667–675 (2010). https://doi.org/10.1007/s10549-010-0789-z
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DOI: https://doi.org/10.1007/s10549-010-0789-z