 0-diamidino-0-phenylindole dihydrochloride (DAPI) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Z-VAD-FMK (pan-caspase inhibitor), Z-DEVD-FMK (caspase-0 inhibitor), Z-IETD-FMK (caspase-0 inhibitor) and Z-LEHD-FMK (caspase-0 inhibitor)