Fig. 8
The expression of apoptosis-related key proteins and the activities of caspase-9 and caspase-3. a, b Western blot analysis was carried out after 48 h without (a) and with (b) treatment of 65.76 μM lipopeptide. c, d The activity was measured at different period with or without lipopeptide treatment. c the activity of caspase 9; d the activity of caspase 3. The caspase enzyme activity of the cells treated with lipopeptide increased as time went by. The caspase inhibitors effectively decreased the caspase enzyme activity