EGCG NPs inhibit activity of MMPs in endothelial cells. (A) Results of gelatin zymography from culture medium after 24 h incubation with a variant formulation for confirm the MMPs activity. (B) Quantification of MMP-2 and MMP-9 activities compared with the control group (n = 3). *p < 0.05 compared with control, #p < 0.05 compared with EGCG. Abbreviation: EGCG: epigallocatechin-3 gallate, HA: hyaluronic acid, RGD: arginine-glycine-aspartic acid, GE: Gelatin/EGCG self-assembling nanoparticles (NPs), GEH: GE NPs with HA surface coating, GEH-RGD: GE NPs with HA-RGD surface decoration, MMP: metalloproteinase.