Figure 2.

Zinc in the Form of ZnO NPs and ZnCl₂ can Stimulate Fibroblasts and Endothelial Cells. Treatment of fibroblasts with 1–7.5 µg/mL ZnO NPs or equivalent amounts of free zinc ions in the form of ZnCl₂ were able to significantly increase their metabolic activity (A). Similarly, endothelial cells were significantly stimulated by concentrations of 1–15 µg/mL ZnO NPs or equivalent amounts of free zinc ions in the form of ZnCl₂ (B). Shown are mean values ± SD. One-way ANOVA, comparison of each dosage group with untreated control group, correction for multiple comparisons by Bonferroni, N ≥ 3, *** p < 0.001, ** p < 0.01, ns = not significant.