The CrmA- and TPCK-sensitive pathways that trigger oligonucleosome-sized DNA fragmentation in camptothecin-induced apoptosis: relation to caspase activation and high molecular weight DNA fragmentation.

Abstract: In human B lymphoma Namalwa variant cells expressing the serpin-like CrmA protein, the kinetics of oligonucleosome-sized DNA fragmentation was retarded compared with that of control Namalwa cells following camptothecin treatment. However, no difference in the kinetics of high molecular weight DNA fragmentation was observed between the two lines after camptothecin treatment. Similar delay and inhibition of the oligonucleosome-sized DNA fragmentation was observed in human B lymphoma Namalwa and monocytic-like leukemia U-937 cells coincubated in the presence of various concentrations of N-tosyl-L-phenylalanyl chloromethylketone and camptothecin. The effect of N-tosyl-L-phenylalanyl chloromethylketone was similar to that of CrmA and did not prevent the appearance of high molecular weight DNA fragments. Similar suppression of camptothecin-induced internucleosomal DNA fragmentation was also observed in a cell-free system when cytosolic extracts obtained from camptothecin-treated Namalwa and U-937 cells were coincubated with untreated nuclei in the presence of N-tosyl-L-phenylalanyl chloromethylketone. Furthermore, N-tosyl-L-phenylalanyl chloromethylketone had no significant effects on caspase-3-like activities in camptothecin-treated Namalwa and U-937 cells. Hydrolysis of Ac-Asp-Glu-Val-Asp-amino-4-methylcoumarin, a fluorogenic substrate with caspase-3-like activities, was detected in extracts prepared from camptothecin-treated Namalwa and U-937 cells with no apparent difference in the time courses of caspase-3-like activation in the absence or presence of N-tosyl-L-phenylalanyl chloromethylketone. Similarly, N-tosyl-L-phenylalanyl chloromethylketone was a weak inhibitor of caspase-3-like activities in vitro. Taken together, these observations suggest that the pathway sensitive to N-tosyl-L-phenylalanyl chloromethylketone is involved in camptothecin-induced oligonucleosome-sized DNA fragmentation. Furthermore, inhibition of this pathway had no effect on caspase-3-like activation and on the occurrence of high molecular weight DNA fragmentation.

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