HPV16E6 protein prevented YAP protein from degradation. Confluent HT3 cells were starved for 4 h before treatment with or without CHX (20 μg/ml), HPV16E6, or CHX combined with HPV16E6 for 8 h. Treatment of starved HT3 cells with HPV16E6 (400 nM) for 8 h suppressed degradation of YAP, but not EGFR protein.Quantitative data showing relative YAP protein levels in (D). Protein levels were normalized with β-actin and presented as ratios relative to that of control. Each bar represents mean ± SEM (n = 4). Bars with different letters are significantly different from each other (Ctrl vs. CHX, P = 0.0003; Ctrl vs. CHX+E6, P = 0.2665; Ctrl vs. E6, P = 0.0258). 