Binding of 53BP1 on uncapped telomeres.

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Volume 14, Issue 4, Pages (May 2004)

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Binding of 53BP1 on uncapped telomeres. Binding of 53BP1 on uncapped telomeres. A, 6-thio-dG induced telomeric localization of 53BP1 in A549-derived tumor cells (representative data). Images were obtained by DeltaVision and then deconvoluted by Autoquant X3. Red dots show DNA damage (53BP1), green dots show telomeres, and yellow dots show TIF (DNA damage on telomeres) in merged images. Scale bars, 3 μm. B, TIF index (percentage of TIF-positive cells) of A549-derived tumor cells treated with 6-thio-dG. Cells with ≥4 or ≥5 53BP1 foci colocalizing with telomere were scored as TIF positive by Imaris software (n > 150 for control, n > 200 for 6-thio-dG treatment). SDs from two independent experiments. **, P = 0.0051; *, P < 0.05 (compared with control), in the unpaired Student t test. C, DNA-damage foci per cell. A549-derived tumor cells treated with 6-thio-dG (n > 150 for control, n > 200 for 6-thio-dG treatment; SDs from two independent experiments). ns, not significant differences in the unpaired Student t test (control vs. 6-thio-dG; control; DMSO treated). D, the tumor volume (mm3) of A549-derived tumor with 6-thio-dG administration. 2 mg/kg of 6-thio-dG or DMSO/PBS was injected to the A549-derived tumor for 17 days every 2 days, intraperitoneally. Ilgen Mender et al. Cancer Discovery 2015;5:82-95 ©2015 by American Association for Cancer Research