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    Keywords: APOPTOSIS ; CANCER ; CANCER CELLS ; CELLS ; EXPRESSION ; GROWTH ; IN-VITRO ; INHIBITOR ; proliferation ; tumor ; CELL ; CELL-PROLIFERATION ; Germany ; DRUG ; DIFFERENTIATION ; INDUCTION ; ACID ; NERVOUS-SYSTEM ; ASSAY ; CANCER-CELLS ; HISTONE DEACETYLASE ; histone deacetylase inhibitor ; p21(waf1) ; neuroblastoma ; INVITRO ; LEUKEMIA-CELLS ; ONCOLOGY ; CHILDHOOD ; RE ; medulloblastoma ; cell proliferation ; ASSAYS ; pharmacology ; USA ; anticancer drug ; childhood cancer ; HELMINTHOSPORIUM-CARBONUM (HC)-TOXIN ; HKI46F08
    Abstract: Embryonic childhood cancer such as neuroblastoma and medulloblastoma are still a therapeutic challenge requiring novel treatment approaches. Here, we investigated the antitumoral effects of HKI 46F08, a novel trifluoromethyl ketone histone deacetylase (HDAC) inhibitor with a nonhydroxamic acid type structure. HKI 46F08 inhibits in-vitro HDAC activity in cell-free assays with a half maximal inhibitory concentration of 0.6 mu mol/l and intracellular HDAC activity with a half maximal inhibitory concentration of 1.8 mu mol/l. The compound reduces viability of both cultured neuroblastoma and medulloblastoma cells with an EC50 of 0.1-4 mu mol/l. HKI 461708 efficiently arrests tumor cell proliferation, represses clonogenic growth and induces differentiation and apoptosis in both MYCN-amplified and nonamplified neuroblastoma cells. In summary, we identified HKI 48F08 as a structural novel, potent HDAC inhibitor with strong antitumoral activity against embryonic childhood cancer cells in the low micromolar range
    Type of Publication: Journal article published
    PubMed ID: 18765999
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