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Abstract
C1027, a new macromolecular antitumor antibiotic with an enediyne chromophore, displays extremely potent cytotoxicity against cancer cells. HL-60 human promyelocytic leukemia cells treated with C1027 (0.1-10 nM) for 2 hours resulted in morphological changes, including Hoechst 33342-stained condensed nuclei, condensation of nuclear chromatin, and nuclear fragmentation. Agarose gel electrophoresis of C1027-treated HL-60 cells showed a typical ladder-like pattern of DNA fragments. In addition, the apoptotic DNA peak of propidium iodide-stained nuclei was revealed by flow cytometry. Treatment of HL-60 cells with C1027 (5 nM) induced apoptosis in up to 79% of the cells. The results suggest that C1027 may exert antitumor activity by triggering apoptosis.
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