Abstract
The isocitrate dehydrogenase 1 (IDH1) gene mutation occurs frequently in glioma. While some studies have demonstrated that IDH1 mutations are associated with prolonged survival, the mechanism remains unclear. In this study, we found that growth was significantly inhibited in glioma cells overexpressing the mutated IDH1 gene. Furthermore, these cells were characterized by decreased intracellular NADPH levels accompanied by glutathione (GSH) depletion and reactive oxygen species (ROS) generation. Moreover, the increased apoptosis and the decreased proliferation were found in the glioma cells overexpressing the mutant IDH1 gene. Accordingly, our study demonstrates that using H2O2-regulated mutant IDH1 glioma cells could obviously increase the inhibition of cell growth; nevertheless, GSH had the opposite result. Our study provides direct evidence that mutation of IDH1 profoundly inhibits the growth of glioma cells, and we speculate that this is the major factor behind its association with prolonged survival in glioma. Finally, our study indicates that depletion of GSH and generation of ROS are the primary cellular events associated with this mutation.
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Acknowledgments
This study was supported by the Youth Fund of the National Natural Science Foundation of China (81201975; 81201979), the Youth Fund of the Natural Science Foundation of Jiangsu Province (BK2012224), the Natural Science Foundation of China Ministry of Health (2010-2-025), the Natural Science Foundation of Jiangsu Department of Health (H201124), the Six Major Human Resources Project of Jiangsu Province (2011-WS-065; 2010-WS-038), the Natural Science Foundation of Jiangsu Colleges and Universities Grant (11KJB320010).
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All the authors report no disclosures relevant to the manuscript. Animal experiments were performed in strict accordance with the Institutional Animal Care guidelines.
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J. Shi and H. Zuo contributed equally to the work.
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Shi, J., Zuo, H., Ni, L. et al. An IDH1 mutation inhibits growth of glioma cells via GSH depletion and ROS generation. Neurol Sci 35, 839–845 (2014). https://doi.org/10.1007/s10072-013-1607-2
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DOI: https://doi.org/10.1007/s10072-013-1607-2