Fig. 4

Effects of PCNP on the apoptosis of human neuroblastoma cells. a The apoptotic levels of SH-SY5Y and SK-N-SH cells were measured by TUNEL staining; original magnification 100×. b The percentages of TUNEL-positive cells were calculated by the formula shown above. c Western blotting analysis for the expression of cleaved caspase-3, − 8, and − 9 and cleaved PARP in SH-SY5Y and SK-N-SH cells. GAPDH was used as the loading control. (d, e) The densitometry analysis of each factor was performed in SH-SY5Y and SK-N-SH cells, normalized to the corresponding GAPDH level. Data are presented as mean ± SEM of three independent experiments; *P < 0.05, **P < 0.01 compared with the Mock group; ^#P < 0.05, ^##P < 0.01 compared with the sh-Scb group