Figure 2.

Knockdown SUV39H2 aggravate senescence in H₂O₂-treated H9C2 cells. (A) H9C2 were infected with lenti-shRNA or lenti-shSUV39H2-1 or lenti-SUV39H2-2 in 50 μM H2O2 for 48 hours, then protein levels of SUV39H2 were detected by western blot. (B) H9C2 were as described above for 48 hours, and β-galactosidase staining was performed. The positive cells are shown in blue. (C–H) H9C2 were cultured with basic medium or 50 μM H2O2 supplemented with or without the lenti-sh-SUV39H2 for 48 hours. (C–E) The protein and mRNA expression of p53, p21, and SUV39H2 were performed by Western blot and qRT-PCR, and ROS generation was detected. (F) Detection of γ-H2AX expression in each group by immunofluorescence. (G) JC-1 monomer images were shown. The green fluorescence represents JC-1 monomers in 530 nm, whereas red fluorescence represents JC-1 aggregates in 590 nm. (H) Electron microscopic images of mitochondrial. All the experiments have been repeated independently at least 3 times. Scale bars, 200 μm.^*P < 0.05, ^**P < 0.01, ^***P < 0.005 when two groups were compared as indicated, or compared to the corresponding control.