Abstract
This review summarizes our observations on the mechanism of induction of apoptosis in vitro in leukaemic cell lines and in vivo in patients with leukaemia undergoing chemotherapy, in relation to the cell cycle. Multiparameter flow cytometric methods allowed us to identify apoptotic cells and position them with respect to their cell cycle phase. Several antitumor agents of different classes have been characterized in terms of the cell cycle phase specificity of induction of apoptosis. Three types of apoptosis could be distinguished in relation to the initial damage to the cell vis-a-vis cell cycle position: (1) homo-phase apoptosis where the cells underwent apoptosis during the same phase in which they were initially affected; (2) homo-cycle apoptosis, where the cells underwent apoptosis during the same cell cycle in which they were initially affected, i.e., prior to or during the first mitosis, and (3) post-mitotic apoptosis, where cells underwent apoptosis during the cell cycle(s) subsequent to that in which the cell was initially affected, most likely at the G1 or G2 checkpoints of these cycle(s). Four ranges of drug concentration can be distinguished in vitro for most drugs, where either: (1) no immediate effects; (2) cytostasis or post-mitotic apoptosis; (3) homo-cycle or homo-phase apoptosis; or (4) necrosis are observed. Analysis of cell death of blast cells from peripheral blood or bone marrow of over 250 leukaemia patients (AML, ALL, CML in blast crisis) treated with various drugs during routine chemotherapy reveals that in the case of DNA topoisomerase inhibitors (e.g., mitoxantrone, VP-16) apoptosis is often rapid (peaks at 1-2 days after drug administration) and has features of homo-phase apoptosis. In contrast, cell death observed after administration of paclitaxel (taxol) or cytarabine (cytosine arabinoside) occurs later and has features of post-mitotic apoptosis: the cells divide but die in G1 of the subsequent cycle(s).
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Halicka, H.D., Seiter, K., Feldman, E.J. et al. Cell cycle specificity of apoptosis during treatment of leukaemias. Apoptosis 2, 25–39 (1997). https://doi.org/10.1023/A:1026431524236
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DOI: https://doi.org/10.1023/A:1026431524236