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  • Original Article
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Apoptosis in malignant glioma cells triggered by the temozolomide-induced DNA lesion O6-methylguanine

Abstract

Methylating drugs such as temozolomide (TMZ) are widely used in the treatment of brain tumours (malignant gliomas). The mechanism of TMZ-induced glioma cell death is unknown. Here, we show that malignant glioma cells undergo apoptosis following treatment with the methylating agents N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) and TMZ. Cell death determined by colony formation and apoptosis following methylation is greatly stimulated by p53. Transfection experiments with O6-methylguanine-DNA methyltransferase (MGMT) and depletion of MGMT by O6-benzylguanine showed that, in gliomas, the apoptotic signal originates from O6-methylguanine (O6MeG) and that repair of O6MeG by MGMT prevents apoptosis. We further demonstrate that O6MeG-triggered apoptosis requires Fas/CD95/Apo-1 receptor activation in p53 non-mutated glioma cells, whereas in p53 mutated gliomas the same DNA lesion triggers the mitochondrial apoptotic pathway. This occurs less effectively via Bcl-2 degradation and caspase-9, -2, -7 and -3 activation. O6MeG-triggered apoptosis in gliomas is a late response (occurring >120 h after treatment) that requires extensive cell proliferation. Stimulation of cell cycle progression by the Pasteurella multocida toxin promoted apoptosis whereas serum starvation attenuated it. O6MeG-induced apoptosis in glioma cells was preceded by the formation of DNA double-strand breaks (DSBs), as measured by γH2AX formation. Glioma cells mutated in DNA-PKcs, which is involved in non-homologous end-joining, were more sensitive to TMZ-induced apoptosis, supporting the involvement of DSBs as a downstream apoptosis triggering lesion. Overall, the data demonstrate that cell death induced by TMZ in gliomas is due to apoptosis and that determinants of sensitivity of gliomas to TMZ are MGMT, p53, proliferation rate and DSB repair.

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Acknowledgements

This Work was supported by Deutsche Forschungsgemeinschaft, DFG KA 724/13-1 and 13-2 and SFB 432/B7 (Mainz), NGFN-2 (Tübingen) as well as FAPESP (Sao Paulo, Brazil). We gratefully acknowledge Georg Nagel and Andrea Piee-Staffa for technical assistance. We also acknowledge a generous gift of PMT from Professor Klaus Aktories, Freiburg and TMZ from Schering-Plough.

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Correspondence to B Kaina.

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Roos, W., Batista, L., Naumann, S. et al. Apoptosis in malignant glioma cells triggered by the temozolomide-induced DNA lesion O6-methylguanine. Oncogene 26, 186–197 (2007). https://doi.org/10.1038/sj.onc.1209785

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