Downregulation of ITCH expression grants protection against ox-LDL-induced endothelial injury and dysfunction through FTL modulation. For (A–J), after transfection with ITCH siRNA, cells were further infected with FTL siRNA for 24 h and then treated with ox-LDL for an additional 24 h. (A) Cell viability. (B) LDH release. (C) NO production. (D) Monocyte adhesion. (E) mRNA expression of TNF-α. (F) mRNA expression of IL-6. (G) mRNA expression of IL-1β. (H) Secretion of TNF-α. (I) Secretion of IL-6. (J) Secretion of IL-1β. Results are presented as the mean ± S.D. For (A–J), n = 6 independent experiments. # p < 0.05 vs. si-con group, * p < 0.05 vs. ox-LDL+si-con group, Δ p < 0.05.