Stimulatory effect induced by docetaxel, gefitinib, and cyclopamine on MMP (A) and (B) cytosolic cytochrome c level. Stimulatory effect induced by docetaxel,

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Stimulatory effect induced by docetaxel, gefitinib, and cyclopamine on MMP (A) and (B) cytosolic cytochrome c level. Stimulatory effect induced by docetaxel, gefitinib, and cyclopamine on MMP (A) and (B) cytosolic cytochrome c level. The PC3 cells were untreated (control) or treated with 2 or 5 nmol/L docetaxel, 1 μmol/L gefitinib, and 2 μmol/L cyclopamine, alone or in combination, in the absence and presence of 50 μmol/L Z-VAD-fmk for 4 d. After the treatment, the cells were prepared by staining with 40 nmol/L 3,3′-dihexyloxacarbocyanine iodide [DIOC6(3)] for analyses of mitochondrial potential by flow cytometry. Moreover, the amount of cytochrome c released into the cytosol was estimated by ELISA assays as described in Materials and Methods. Representative data (A) and results (B) obtained from two to three separate experiments. *, P < 0.05, significant difference of either the stimulatory effects on the cytosolic cytochrome c release induced by the docetaxel, gefitinib, and cyclopamine alone compared with two combined drugs or the stimulatory effects induced by a combination of two drugs compared with the three combined drugs at the same concentrations. Murielle Mimeault et al. Mol Cancer Ther 2007;6:967-978 ©2007 by American Association for Cancer Research