Fig. 3

Effect of VRK1 depletion on nuclear NBS1 fluorescence induced by olaparib, IR or their combination in H1299 (TP533−/−) cells arrested by the absence of serum. A left. Effect of si-Control on H1299 cells treated with different doses of olaparib, IR or their combination on the NBS1 fluorescence. a right. Effect of si-VRK1 on H1299 (TP53−/−) cells treated with different doses of olaparib, IR or their combination on the accumulation of NBS1 foci in nuclei. b. Quantification of the effect of VRK1 depletion on the increase of nuclear NBS1 fluorescence by aggregation of this protein induced by DNA damage. Similar results were obtained in A549 (TP53wt) (Additional file 7: Figure S7), and HT144 (ATM−/−) cells (Additional file 8: Figure S8) in the absence of serum (0.5%). c. The immunoblot shows the effect of VRK1 depletion on its protein level. siC: siControl, siV: siVRK1–02. ns: not significant, ** p < 0.01, *** p < 0.001