The Annexin V In Situ Cell Apoptosis Detection Kit (Roche, Indianapolis, IN) [61 , 63 (link)] was employed to test cell apoptosis. In brief, following the applied LB-100 treatment, cells were washed, fixed and stained with Annexin V (2.5 μg/mL) and propidium iodide (PI) (2.5 μg/mL). The cell apoptosis ratio was reflected by Annexin V+/+/PI-/- plus Annexin V+/+/PI+/+ percentage detected by fluorescence-activated cell sorting (FACS) counter (Beckman Coulter, Shanghai, China).
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