Abstract
This study is aimed at investigating the effect of arsenic trioxide (ATO) on p53 null human osteosarcoma MG63 cells and the mechanisms underlying the effect. Apoptotic cells were detected by flow cytometry with Annexin-V-FITC/PI dual staining. Intracellular ROS was measured by flow cytometry using a cell-based ROS assay kit. Catalase activity and mRNAs were analyzed by ELISA and real-time qRT–PCR, respectively. Apoptosis and intracellular ROS of MG63 cells increased in a dose-dependent manner following arsenic treatments. Both were prevented by the presence of the anti-oxidative reagent N-acetyl-l-cysteine (NAC) or catalase (CAT). Furthermore, the activity and mRNA of catalase were decreased strikingly following arsenic exposure. The present study indicates that p53 null osteosarcoma MG63 cells are susceptible to the ATO; the inhibition of catalase and the resulted intracellular ROS accumulation are an important molecular mechanism under which ATO induces apoptosis of p53-deficient osteosarcoma cells.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (Grants: NSFC No. 30872193). We would like to express our great appreciation to Dr. Xuejin Su, for his excellent technical assistance.
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Wang, Y., Wei, Y., Zhang, H. et al. Arsenic trioxide induces apoptosis of p53 null osteosarcoma MG63 cells through the inhibition of catalase. Med Oncol 29, 1328–1334 (2012). https://doi.org/10.1007/s12032-011-9848-5
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DOI: https://doi.org/10.1007/s12032-011-9848-5