Defining the target specificity of ABT-737 and synergistic antitumor activities in combination with histone deacetylase inhibitors.
Blood
; 113(9): 1982-91, 2009 Feb 26.
Article
em En
| MEDLINE
| ID: mdl-19060243
ABSTRACT
The apoptotic and therapeutic activities of the histone deacetylase inhibitor (HDACi) vorinostat are blocked by overexpression of Bcl-2 or Bcl-X(L). Herein, we used the small molecule inhibitor ABT-737 to restore sensitivity of Emu-myc lymphomas overexpressing Bcl-2 or Bcl-X(L) to vorinostat and valproic acid (VPA). Combining low-dose ABT-737 with vorinostat or VPA resulted in synergistic apoptosis of these cells. ABT-737 was ineffective against Emu-myc/Mcl-1 and Emu-myc/A1 cells either as a single agent or in combination with HDACi. However, in contrast to the reported binding specificity data, Emu-myc/Bcl-w lymphomas were insensitive to ABT-737 used alone or in combination with HDACi, indicating that the regulatory activity of ABT-737 is restricted to Bcl-2 and Bcl-X(L). Emu-myc lymphomas that expressed Bcl-2 throughout the tumorigenesis process were especially sensitive to ABT-737, while those forced to overexpress Mcl-1 were not. This supports the notion that tumor cells "addicted" to ABT-737 target proteins (ie, Bcl-2 or Bcl-X(L)) are likely to be the most sensitive target cell population. Our studies provide important preclinical data on the binding specificity of ABT-737 and its usefulness against primary hematologic malignancies when used as a single agent and in combination with HDACi.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Sulfonamidas
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Compostos de Bifenilo
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Protocolos de Quimioterapia Combinada Antineoplásica
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Inibidores Enzimáticos
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Inibidores de Histona Desacetilases
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Linfoma
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Nitrofenóis
Limite:
Animals
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article