Abstract
Cellular responses to DNA damage are mediated by an extensive network of signaling pathways. The ATM protein kinase is a master regulator of the response to double-strand breaks (DSBs), the most cytotoxic DNA lesion caused by ionizing radiation. ATM is the protein missing or inactive in patients with the pleiotropic genetic disorder ataxia-telangiectasia (A-T). A major response to DNA damage is altered expression of numerous genes. While studying gene expression in control and A-T cells following treatment with the radiomimetic chemical neocarzinostatin (NCS), we identified an expressed sequence tag that represented a gene that was induced by DSBs in an ATM-dependent manner. The corresponding cDNA encoded a dual specificity phosphatase of the MAP kinase phosphatase family, MKP-5. MKP-5 dephosphorylates and inactivates the stress-activated MAP kinases JNK and p38. The phosphorylation–dephosphorylation cycle of JNK and p38 by NCS was attenuated in A-T cells. Thus, ATM modulates this cycle in response to DSBs. These results further highlight ATM as a link between the DNA damage response and major signaling pathways involved in proliferative and apoptotic processes.
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Acknowledgements
This work was supported by research grants from the A-T Children's Project, the A-T Medical Research Foundation, The Thomas Appeal (A-T Medical Research Trust), and the National Institutes of Health (RO1 NS31763).
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Bar-Shira, A., Rashi-Elkeles, S., Zlochover, L. et al. ATM-dependent activation of the gene encoding MAP kinase phosphatase 5 by radiomimetic DNA damage. Oncogene 21, 849–855 (2002). https://doi.org/10.1038/sj.onc.1205127
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DOI: https://doi.org/10.1038/sj.onc.1205127
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