Apoptosis of A549 and H1299 cells was examined by the Annexin V-fluorescein isothiocyanate-propidium iodide apoptosis kit (BD Biosciences, NJ, USA). Cells were collected after transfection and washed with cold PBS. The cells were then suspended with 1 × binding buffer (500 μl), mixed with 5 μl Annexin, and preserved at room temperature for 15 min away from light with V‐FITC and 5 μl PI. The percentage of apoptotic cells was assessed on an FACS Calibur flow cytometer [25 (link)].
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