Cell viability was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyl tetrasodium bromide (MTT) absorbance (Sigma Aldrich). For cell cycle analysis cells (2 × 106 cells/ml) were serum-starved overnight, cultured for 24 h in RPMI-1640/10% FCS medium with additions as indicated, fixated in ethanol, stained with propidium iodide (PI), and subjected to FACScan/CellQuest analysis (BD Biosciences). For apoptosis analysis cells were cultured in RPMI-1640/10% FCS medium with additions as indicated, stained by Annexin V-FITC (BD Pharmingen) and PI, and subjected to FACScan/CellQuest analysis (BD Biosciences).
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