Abstract
Ceramide induces apoptotic cell death in a dose- and time-dependent manner in neuroblastoma SKN-SH cells. Pretreatment with caspase inhibitors blocks cell death, suggesting that a set of caspase activities including caspase 1, as well as caspase 3, are involved in ceramide-induced apoptosis in SKN-SH cells. Treatment with a caspase inhibitor 3 h after ceramide addition did not inhibit cell death, although caspase activity was substantially reduced. Ceramide-induced apoptosis is accompanied by accumulation of p53 followed by an increase of Bax and decrease of Bcl-2 levels. Inhibition of p53 expression with p53 antisense oligonucleotides inhibits apoptosis and prevents the increase in Bax and decrease in Bcl-2. Furthermore, pretreatment with p53 antisense oligonucleotides markedly inhibits the induction of caspase activity. These results suggest that p53 regulates the ratio Bcl-2/Bax and the expression/activation of caspases during ceramide-induced apoptosis in SKN-SH cells. Caspase inhibition did not alter the expression of p53, Bcl-2 and Bax. Thus ceramide-induced reduction in the Bcl-2/Bax ratio, increase in caspase activity, and apoptosis is dependent upon increases in cellular p53 levels which play a critical role in the regulation of apoptotic cell death.
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Acknowledgements
This research was supported by a grant of the Korea Health 21 R&D Project, Ministry of Health & Welfare, Republic of Korea (01-PJ8-PG1-01CN2-0003), Korea Science and Engineering Foundation Grant (2000-2-21300-004-3), Korea Research Foundation Grant (KRF-2000-015-FP0045), and National Creative Research Initiative Program from MOST (2000-2003). JV Bonventre was supported by grants from the National Institutes of Health DK 39773, DK 38452 and NS 10828.
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Kim, S., Chae, HS., Bach, JH. et al. P53 mediates ceramide-induced apoptosis in SKN-SH cells. Oncogene 21, 2020–2028 (2002). https://doi.org/10.1038/sj.onc.1205037
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DOI: https://doi.org/10.1038/sj.onc.1205037
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