Abstract
The DNA fragmentation, a parameter of apoptosis, in non-small (NSCLC) and small (SCLC) cell lung cancer cell lines (N231 and PC-9) was evaluated. The DNA fragmentation in SCLC lines, but not in NSCLC lines, was observed in overgrown cells without exposure to anticancer drugs. In etoposide (VP-16)-treated N231 but not PC-9 cells, DNA fragmentation continued to increase up to 42 h, and the increase was dependent on the concentration of VP-16. The endonuclease activity of VP-16-treated N231, but not PC-9, cells required both Ca2+ and Mg2+ for full activity. It was elevated in a time- and concentration-dependent manner. As this activity was not affected by addition of cycloheximide, the activation of the endonuclease activity without protein synthesis may be involved in VP-16-induced cytotoxicity in N231.
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This work was supported, in part, by grants-in-Aid for Cancer Research from the Ministry of Health and Welfare, the Comprehensive Ten-year Strategy for Cancer Control and the Ministry of Education, Science and Culture, Support from the Bristol Myers Squibb Foundation is also appreciated
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Okamoto-Kubo, S., Nishio, K., Heike, Y. et al. Apoptosis induced by etoposide in small-cell lung cancer cell lines. Cancer Chemother. Pharmacol. 33, 385–390 (1994). https://doi.org/10.1007/BF00686267
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DOI: https://doi.org/10.1007/BF00686267