detection Kit (BioVision, Mountain View, California) was used to detect the percentage of
apoptotic H1650 cells.20 (link) Briefly, H1650 cancer cells were plated onto 6-well plate and transfected with
PS2ODNs when the cells reached 70% to 80% confluence. The mismatched sequence and
apoptosis inducer kit (Beyotime, Shanghai, China) were used as the negative and positive
controls, respectively. After incubation, the cells were harvested with 0.25% wt/vol
trypsin for apoptosis detection. Annexin V-FITC and PI were added for a 30-minute
incubation at 37°C in the dark to stain the harvested cells, followed by 2 washes with
phosphate-buffered saline. The stained cells in each group were detected by flow cytometry
(BD, New Jersey, USA) at an excitation wavelength of 488 nm and emission wavelengths of
525 and 625 nm.