The cytotoxicity and biological function of PCP and NPs/miR365 nanocomplex. A) Cytotoxicity of PCP on MC38 cells at different concentrations (all data was compared with PCP at 0 μg mL−1 concentration). B) Cytotoxicity of 50 μg mL−1 of PCP on MC38 cells at different time points (compared with 0 h treatment). C) Cells uptake of NPs/miRNA in 293 T and MC38 cells. D) Inhibitory effect of NPs/miR365 on MC38 cells proliferation after 24 h treatment. PCP mediated miRNA mimic control (NPs/NC) and commercial lipofectamine 2000 mediated miR365 delivery (Lipo/miR365) were used as controls. E) The effects of NPs/miR365 on the proliferation of MC38 cells after 24 h, 48 h and 72 h treatment respectively. F) Live/dead staining of MC38 cells after 24 h treatment of NPs/miR365. G) Cell scratch images at 0, 12, 24 and 48 h were recorded using a microscope. H) Statistical analysis of scratch distance. n. s. (no significance). ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001 (n = 3).