Fig. 4
a The effect of various concentrations of Ce-doped CNPs on the cell viability of VSMC and 7721 cells by CCK-8. Cells were pre-treated Ce-doped CNPs at different concentrations for 24 h and then were administrated by H2O2 at different dosages. b Cell viability of VSMC and c 7721 cells cultured with different concentrations of Ce-doped CNPs under 560 μM H2O2-induced oxidative stress a by CCK-8 assay