Hep-2 cells were cultured in 6-well plates at a concentration of 2×105 cells/well. Following the aforementioned treatments (part of investigation of sequential treatment with PDT followed by CDDP), the Hep-2 cells were collected by performing trypsin detachment, re-suspension in 1× binding buffer from the Dead Cell Apoptosis Kit with FITC-Annexin V and PI (BD Biosciences Pharmingen, San Jose, CA, USA) at a concentration of 1×106 cells/mL and stained using the Dead Cell Apoptosis Kit with FITC-Annexin V and PI in strict accordance following the manufacturer’s protocol. Coulter Epics XL flow cytometer (Beckman Coulter, Fullerton, CA, USA) was used for analysis of the stained cells.
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