CD40L and CD40 expression induced by SiO
particles in HUVECs and THP-1 cells. A): Dot-plot of flow cytometry analysis showing the expressions of CD40L and CD40 on THP-1 cells and HUVECs; B): The bar graph shows the percentage of CD40L or CD40 positive THP-1 cells; C): The bar graph shows the percentage of CD40L or CD40 positive HUVECs. Untreated HUVECs or THP-1 cells served as controls. Data represent the mean ± SEM, n = 3. **p < 0.01 vs. control. (c: control, SiNPs: SiO2 particles, EC: endothelial cells).