Abstract
Histone deacetylases (HDACs) have been identified as therapeutic targets due to their regulatory function in chromatin structure and organization. Here, we analyzed the therapeutic effect of LBH589, a class I–II HDAC inhibitor, in acute lymphoblastic leukemia (ALL). In vitro, LBH589 induced dose-dependent antiproliferative and apoptotic effects, which were associated with increased H3 and H4 histone acetylation. Intravenous administration of LBH589 in immunodeficient BALB/c-RAG2−/−γc−/− mice in which human-derived T and B-ALL cell lines were injected induced a significant reduction in tumor growth. Using primary ALL cells, a xenograft model of human leukemia in BALB/c-RAG2−/−γc−/− mice was established, allowing continuous passages of transplanted cells to several mouse generations. Treatment of mice engrafted with T or B-ALL cells with LBH589 induced an in vivo increase in the acetylation of H3 and H4, which was accompanied with prolonged survival of LBH589-treated mice in comparison with those receiving vincristine and dexamethasone. Notably, the therapeutic efficacy of LBH589 was significantly enhanced in combination with vincristine and dexamethasone. Our results show the therapeutic activity of LBH589 in combination with standard chemotherapy in pre-clinical models of ALL and suggest that this combination may be of clinical value in the treatment of patients with ALL.
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Acknowledgements
This work was supported in part by grants from the Spanish Ministerio de Ciencia e Innovacion and Instituto de Salud Carlos III (ISCIII) PI07/0602, PI10/00110, PI10/01691, PI08/0440 and RTICC RD06/0020, Contrato Miguel Servet CP07/00215, European FEDER funds Interreg IVA (CITTIL), Programa Tu Eliges, Tu Decides (CAN), Gobierno de Navarra, Departamento de Salud, Beca Ortiz de Landázuri 2009 (6/2009) and funds from the ‘UTE project CIMA’, collaborative project of the Asociación Española Contra el Cáncer and Junta de Andalucía 0004/2007 and 0206/2009. AV-Z is supported by Ministerio Ciencia e Innovación (AP2008/03686).
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Vilas-Zornoza, A., Agirre, X., Abizanda, G. et al. Preclinical activity of LBH589 alone or in combination with chemotherapy in a xenogeneic mouse model of human acute lymphoblastic leukemia. Leukemia 26, 1517–1526 (2012). https://doi.org/10.1038/leu.2012.31
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DOI: https://doi.org/10.1038/leu.2012.31
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