DAO enhances DNA damage–induced ROS accumulation, cooperating with PRODH. DAO enhances DNA damage–induced ROS accumulation, cooperating with PRODH. (A)

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DAO enhances DNA damage–induced ROS accumulation, cooperating with PRODH. DAO enhances DNA damage–induced ROS accumulation, cooperating with PRODH. (A) U2OS cells transfected with siRNAs for DAO (DAO-1 and DAO-2) were treated with 2 μM etoposide for 2 d, and the ROS level was measured. (B, C) U2OS (B) and HepG2 (C) cells treated with 2 and 10 μM etoposide, respectively, for 2 d in the presence of 50 μM CBIO were subjected to ROS assay. (D) U2OS cells transfected with pcDNA3-HA-DAO and treated with 2 μM etoposide were subjected to ROS assay. (E, F) U2OS cells overexpressing DAO were treated with etoposide in the presence of 1 mM NAC for 7 d and subjected to SA-β-gal staining (E) and EdU incorporation assay (F). (G) U2OS cells treated as in (E, F) but for 2 d instead of 7 d were subjected to immunoblot analysis. The protein levels relative to the γ-tubulin levels were quantified using NIH ImageJ software and are indicated at the bottom of each lane. (H, I) U2OS cells treated with etoposide in combination with 50 μM CBIO and 1 mM NAC as indicated for 7 d were subjected to SA-β-gal staining (H) and EdU incorporation assay (I). (J) U2OS cells treated as in (H, I) but for 2 d instead of 7 d were subjected to immunoblot analysis. The protein levels were quantified as in (G). (K, L) U2OS cells treated as in (H, I) but 5 mM THFA instead of NAC were subjected to SA-β-gal staining (K) and EdU incorporation assay (L). (M) U2OS cells treated as in (K, L) but for 2 d instead of 7 d were subjected to immunoblot analysis. The protein levels were quantified as in (G). (N, O) Hs68 cells treated as in (K, L) were subjected to SA-β-gal staining (N) and EdU incorporation assay (O). (P) Hs68 cells treated as in (N, O) but for 2 d instead of 7 d were subjected to immunoblot analysis. The protein levels were quantified as in (G). Data are mean ± SD (n = 3 independent experiments). Statistical significance is shown using the t test analysis; *P < 0.05, **P < 0.01, and n.s. = not significant (P > 0.05). Taiki Nagano et al. LSA 2019;2:e201800045 © 2019 Nagano et al.