Representative images show 8-oxo-dG staining. Control or shATG5 HeLa cells were treated with DMSO, 200 µM H2O2, or 4 mM 3-NPA for 2 h, and then either fixed immediately or washed with fresh medium and incubated for another 1 h. Cells were immunostained with DAPI and anti-8-oxo-dG antibody and analyzed by confocal microscopy. Scale bar, 10 µm. Quantification of the relative 8-oxo-dG fluorescence intensity in (C). Data are presented as mean ± SD (n = 3 independent experiments, 20 cells per experiment), statistical significance was assessed by a two-tailed student's t-test, N.S., not significant, *p < 0.05, **p < 0.01. 