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Low concentrations of camptothecin induced differentiation of human and mouse myeloid leukemia cells including human HL60, U937, ML1, and K562 cells and mouse M1 cells as measured by various differentiation-associated properties. When K562 cells were pretreated with 20 nM camptothecin for 2 h, 53% of the cells were induced to differentiate as measured by NBT staining. Significant single strand breaks in DNA of K562 cells were caused by this treatment. Most single strand breaks were accompanied by protein-DNA cross linking. The combination of camptothecin and rTNF synergistically induced differentiation of human ML1, U937, and M1 cells. These results suggest that topo I may be important in some differentiation of myeloid leukemia cells.
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