Induction of DNA double‐strand breaks and activation of the ataxia telangiectasia mutated pathway in post‐mitotic cells in response to camptothecin. Induction.

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Induction of DNA double‐strand breaks and activation of the ataxia telangiectasia mutated pathway in post‐mitotic cells in response to camptothecin. Induction of DNA double‐strand breaks and activation of the ataxia telangiectasia mutated pathway in post‐mitotic cells in response to camptothecin. (A) γ‐H2AX foci in human lymphocytes and rat cortical neurons treated with 25 μM CPT for 1 h before staining for γ‐H2AX (green). DNA was counterstained with propidium iodide (red). Numbers indicate the percentage of cells with at least one γ‐H2AX focus (bottom) and the average number of γ‐H2AX foci per cell (top). Scale bar, 5 μm. (B) Flow cytometry analysis of γ‐H2AX and DNA contents (PI staining) in human lymphocytes treated with 25 μM CPT for 2 h. Top panels: numbers are the percentage of γ‐H2AX‐positive cells (average±standard deviation), which are coloured in green. Bottom panels: a comparison of the γ‐H2AX‐positive fraction (green) with the total DNA content of the population (white). (C,D) Induction of double‐strand breaks in rat neurons. Cells were treated with 25 μM CPT for 1 h and DSBs were detected by neutral COMET assay. (C) Representative pictures of nuclei. (D) Quantification of the COMET tail length (average±standard deviation, 30–40 cells were examined per group). Asterisks denote significant difference from untreated cells (P<0.001; t‐test). (E,F) Phosphorylation of ATM on Ser 1981 (ATM‐PS1981), H2AX on Ser 139 (γ‐H2AX) and CHK2 on Thr 68 (CHK2‐PT68) was determined by Western blotting in human lymphocytes treated with 25 μM CPT. Total ATM, H2AX and CHK2 were examined in parallel. (G) Colocalization of γ‐H2AX foci with ATM‐PS1981, MDC1, 53BP1 and CHK2‐PT68. Human lymphocytes were treated with 25 μM CPT for 1 h before staining. Images were merged to determine colocalization (yellow). Scale bar, 5 μm. Nuclear outlines are shown. (H) Reversal of γ‐H2AX after CPT removal. Human lymphocytes were treated with 25 μM CPT for 2 h, and washed (W) and cultured in CPT‐free medium (−CPT) for the indicated times. Unwashed cells (+CPT) were examined in parallel. Percentages of γ‐H2AX‐positive cells were determined by flow cytometry as described in (B) and normalized to the level at the time of CPT removal, which was taken at 100%. ATM, ataxia telangiectasia mutated; 53BP1, p53 binding protein 1; CHK2, checkpoint kinase 2; CPT, camptothecin; DSBs, double‐strand breaks; γ‐H2AX, phosphorylated histone H2AX; MDC1, mediator of DNA damage checkpoint 1; PI, propidium iodide. Olivier Sordet et al. EMBO Rep. 2009;10:887-893 © as stated in the article, figure or figure legend