Abstract
Rana catesbeiana ribonuclease (RC-RNase) exerted strong anti-tumor activity and its cytotoxicity was shown to correlate with differentiation stages of three different hepatoma cell lines. In this study, we demonstrate different RC-RNase cytotoxicity in undifferentiated HL-60 cells and in those that had been induced to differentiate by retinoic acid or dimethylsulfoxide. RC-RNase showed cytotoxicity in undifferentiated HL-60 cells, but not in HL-60 cells undergoing terminal differentiation. Furthermore, the caspase-9/caspase-3 pathway was activated when RC-RNase induced death in undifferentiated HL-60 cells and induction of differentiation led to a reversal of the caspase activation pathway.
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