Caspase 3 activity was assessed using a Colorimetric Caspase 3 Enzyme Assay Kit (Abcam). Briefly, RF-treated HUVECs were resuspended in lysis buffer and incubated on ice for 30 min. After centrifugation at 14,000 × g for 10 min at 4 °C, protein extracts were collected and quantified using a DC Protein Array Kit (Bio-Rad, Hercules, CA, USA). Protein extracts (500 µg) were incubated with reaction buffer containing 2 mM Ac‐DEVD‐AFC and 10 mM DTT at 37 °C for 30 min. Caspase activity was determined by measuring the absorbance at 405 nm.
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