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Cell-cycle disruptions and apoptosis induced by the cyclophosphamide derivative mafosfamide
1Department of Haematology, School of Pathology of the University of the Witwatersrand, South Africa.
Abstract:
The effect of the cyclophosphamide derivative mafosfamide (ASTA Z 7557) was investigated in vitro in HL60 leukemic cells. Mafosfamide, which rapidly generates 4-hydroxycyclophosphamide after aqueous dissolution, was employed at doses ranging from 0.1 to 10 micrograms/mL. In unsynchronized cells, mafosfamide exposure was associated with an S-phase accumulation, a suggestion of a G2-phase arrest and morphological and biochemical evidence of apoptosis. In cells that had been synchronized by the double thymidine block method, S-phase progression was considerably delayed in the presence of mafosfamide. The apoptosis that was evident in mafosfamide-treated cells 12 hours after release from the thymidine block was found to occur in the presence of S-phase and G2-phase cell-cycle arrests. Taken together, the current data suggest that mafosfamide may have potential synergism with other anticancer agents that elicit similar cell-cycle arrests as well as with chemotherapeutic drugs that activate the apoptotic cascade.
Insights
Mafosfamide, a cyclophosphamide derivative, induces apoptosis and cell cycle arrest in leukemic cells. This suggests potential synergistic effects when combined with other anticancer agents.
Area of Science:
- Pharmacology
- Cell Biology
- Oncology
Background:
- Cyclophosphamide derivatives are crucial in cancer chemotherapy.
- Understanding the mechanisms of action of novel agents like mafosfamide is essential.
Purpose of the Study:
- To investigate the in vitro effects of mafosfamide (ASTA Z 7557) on HL60 leukemic cells.
- To determine the impact of mafosfamide on cell cycle progression and apoptosis.
Main Methods:
- Exposure of HL60 cells to varying doses of mafosfamide (0.1-10 µg/mL).
- Cell cycle analysis using methods like double thymidine block.
- Morphological and biochemical assessment of apoptosis.
Main Results:
- Mafosfamide induced S-phase accumulation and suggested G2-phase arrest in unsynchronized cells.
- Apoptosis was observed in mafosfamide-treated cells, occurring alongside S-phase and G2-phase cell cycle arrests.
- Significant delay in S-phase progression was noted in synchronized cells.
Conclusions:
- Mafosfamide triggers apoptosis and cell cycle arrest in leukemic cells.
- Potential for synergistic activity of mafosfamide with other anticancer drugs that induce similar cell cycle arrests or apoptosis.