For cell apoptosis assays, the fluorescein isothiocyanate (FITC)–Annexin V and propidium iodide (PI) Apoptosis Detection kit I (BD Pharmingen) was used as previously described [29 (link)]. For cell cycle analysis, PEL cell pellets were fixed in 70% ethanol, and incubated at 4°C overnight. Cell pellets were re-suspended in 0.5 mL of 0.05 mg/mL PI plus 0.2 mg/mL RNaseA and incubated at 37°C for 30 min. Cell cycle distribution was analyzed on a FACS Calibur 4-color flow cytometer (BD Bioscience).
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