Bcl-2 and caspase inhibition fails to inhibit BAMLET-induced cytotoxicity in MCF-7 cells. Bcl-2 and caspase inhibition fails to inhibit BAMLET-induced.

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Presentation transcript:

Bcl-2 and caspase inhibition fails to inhibit BAMLET-induced cytotoxicity in MCF-7 cells. Bcl-2 and caspase inhibition fails to inhibit BAMLET-induced cytotoxicity in MCF-7 cells. A, Bcl-2–expressing MCF-7 cells (MCF-7-Bcl-2) and appropriate vector-transfected control cells (MCF-7-Vector) were treated with indicated concentrations of BAMLET for 24 h (first 1 h without serum). The viability of the cells was assessed by the MTT assay and the values represent means of three independent triplicate measurements ± SD. The differences between the two cell lines were not significant (P > 0.05, Student's t-test). B, caspase-3–expressing MCF-7 cells (MCF-7-Casp3) and appropriate vector-transfected control cells (MCF-7-Vector) were treated with indicated concentrations of BAMLET for 24 h (first 1 h without serum) before the analysis of caspase-3/7 activity (DEVDase) in the cell lysates. The values are DEVDase activities corrected to the lactate dehydrogenase activity in the samples and they represent means of a representative triplicate experiment ± SD. C, MCF-7-Casp3 cells were treated with indicated concentrations of BAMLET for 24 h (first 1 h without serum) alone or with 20 μmol/L zVAD-fmk. The viability of the cells was assessed by the MTT assay and the values represent means of a representative triplicate experiment ± SD. D, MCF-7 cells were treated with indicated concentrations of BAMLET for 24 h (first 1 h without serum) or with 15 ng/mL tumor necrosis factor (TNF) in complete medium. When indicated, the cells were cotreated with vehicle (DMSO), 100 μmol/L zFA-fmk, or 100 μmol/L zVAD-fmk. Apoptosis-like cell death was assessed by counting the Hoechst-stained cells with condensed nuclei. The values represent means of three independent experiments with a minimum of 100 cells counted ± SD. *, P < 0.05; **, P < 0.01; ***, P < 0.001 as compared with control or cells cotreated with DMSO. Paul Rammer et al. Mol Cancer Ther 2010;9:24-32 ©2010 by American Association for Cancer Research