2.7. Apoptosis analysis with Annexin V/PI staining
A FITC-labeled Annexin V/PI Apoptosis Detection Kit (BioVision,
Mountain View, CA) was used to evaluate apoptosis-mediated
death of tumor cells. Briefly, exponentially growing C26 cells were
treated at various concentrations of ZS for 24 h.
Untreated and treated C26 cells were harvested and washed with PBS and resuspended in 500 of binding buffer, and
then, 5 of annexin-v-fitc and 5 of PI were added. After supravital staining, the cells were immediately analyzed using flow cytometry
Furthermore, the cell-permeable cawpase inhibitor Z-VAD-FMK was used to study whether caspase family protein kinase were involved in ZS-induced apoptosis in C26 cells [21]
Briefly, after
treating with 0.5 lM and 0.8 lM ZS combined with or without
10 lM Z-VAD-FMK for 24 h, apoptosis was evaluated in C26 cells
using FCM.