The HUVECs were transiently transfected with SMART pools human Cav-2 siRNA (Dharmacon, USA) using Lipofectamine® reagent (Invitrogen, USA) according to the manufacturer’s instructions (Jeon et al., 2015 (link)). Green fluorescence protein (GFP) siRNA (Bioneer, Korea) was used as a control. After 48 h of transfection, the cells were used for subsequent experiments.