Effects of lycopene treatment at 1 nM, 10 nM, 100 nM, 1 μM, and 10 μM for 24 h on base excision repair-related genes. Graphic representation of fold changes in: (A,B) protein levels of 8-oxoguanine DNA glycosylase (OGG1), Nei-like glycosylase (NEIL)1, NEIL2 and NEIL3; and (C) mRNA level of NTH1. Three replicates were used for statistical analysis. Values are means ± SEMs. NS—cells not exposed to smoke; S—cells exposed to smoke; * indicates significance at p < 0.05; ** indicates significance at p < 0.01 compared with the cells not exposed to smoke treated with vehicle; # indicates significance at p < 0.05 compared with the cells exposed to smoke treated with vehicle.