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- W2075965014 abstract "These studies have identified a new activity of bleomycin (in addition to the well-known DNA cleavage): drug-induced chromatin aggregation. Bleomycin treatment of presolubilized chromatin from L1210 nuclei resulted in two types of effect as shown by sedimentation analysis of intact nucleoprotein. The first effect was a dose-dependent fragmentation of chromatin to mononucleosomes (12 S) and subnucleosomal fragments (under 5 S). The second effect was aggregation manifested by the generation of large chromatin particles (over 120 S) that sedimented faster than the original material (20-40 S). Bleomycin treatment of nuclei from L1210 cells resulted in a similar, almost bimodal, size distribution of drug-released chromatin fragments. Increasing levels of bleomycin produced a gradual enhancement of the amount of small fragments (under 5 S) accompanied by generation of large, aggregated particles. Aggregation caused by high drug concentrations significantly reduced the overall extent of chromatin solubilization and allowed only the release of the most degraded fragments from nuclei. The aggregation required intact nucleoprotein, since it was not detected after high-salt deproteinization of bleomycin-treated presolubilized or nuclear chromatin. The aggregation phenomenon reflects a novel activity of bleomycin which may contribute to the drug's antiproliferative properties." @default.
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- W2075965014 date "1987-11-01" @default.
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- W2075965014 title "Bleomycin-induced aggregation of presolubilized and nuclear chromatin from L1210 cells" @default.
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- W2075965014 doi "https://doi.org/10.1016/0167-4781(87)90067-4" @default.
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