VEGF induction of MEF2C RNA and protein expression in a time- and dose-dependent manner in human endothelial cells. (A) HRECs and HUVECs were treated with VEGF at the indicated doses for 4 hours. Total RNA was isolated, and reverse transcription and quantitative real-time PCR were performed as in Figure 1. Values were normalized to GAPDH gene expression. (B) HRECs were treated with VEGF (25 ng/mL) for the indicated amount of time. Total RNA was isolated, and MEF2C expression was assessed by quantitative real-time PCR. Results are representative of three independent experiments, each performed with duplicate samples. CN, control. (C) HRECs and HUVECs were treated with VEGF (25 ng/mL) for the indicated amount of time. Cells were harvested and probed with antibody to MEF2C. The same membrane was stripped and blotted with antibody to GAPDH for normalization. Results shown are representative of three independent experiments. *P < 0.05, **P < 0.01, and ***P < 0.001 versus control.