Fig. 5. 2-MCA induced apoptosis through the mitochondrial pathway in COLO 205 cells. (a) Left, cells were incubated with the
indicated concentrations of 2-MCA for 48 h and DC
m was analyzed using JC-1 with a fluorescence microscopy (40 objective).
Control cells (upper part) with intact mitochondria fluorescencing red. Most 2-MCA-treated cells (lower part) fluorescencing
green, suggesting the loss of DCm. (a) Right, cells were treated with the indicated 2-MCA concentrations for 48 h and DCm was
determined using JC-1 spectrophotometrically. (b) Activations of caspase-3 and -9. The cells were incubated with the indicated
2-MCA concentrations for 48 h and activities of caspases-3 as well as -9 were evaluated using fluorescence-labeled synthetic
substrates spectrophotometrically. Data are presented as means9standard error of mean, n3. *Indicates a significant
difference (pB0.05) from control. 2-MCA, 2-methoxycinnamaldehyde.