Flow cytometric analysis (BD Accuri™ C6, BD biosciences) was performed to evaluate cell cycle distribution by propidium iodide (PI) staining, apoptosis by AnnexinV-FITC/PI staining, and to detect acidic vesicular organelles (AVOs) by acridine orange staining, as previously described
[39 (link), 40 (link)]. Active Caspase-3 Apoptosis Kit (BD biosciences) was used to detect the heterodimer of 17 and 12 kDa subunits, which is derived from the pro-enzyme.
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