Abstract
Comparison between five human leukemic lines (BV173, HL60, U937, K562, KCL22) suggest that the main determinant of their sensitivity to topoisomerase I (camptothecin) and II (VP-16) inhibitors is their ability to regulate cell cycle progression in response to specific DNA damage, then to die through apoptosis: the more the cells inhibit cell cycle progression, the less sensitive they are. The final pathway of apoptosis induction involves a cytoplasmic signal, active at neutral pH, needing magnesium, sensitive to various protease inhibitors and activated directly by staurosporine. Modulators of intracellular signaling (calcium chelators, calmoduline inhibitors, PKC modulators, kinase and phosphatase inhibitors) have no significant influence upon apoptosis induction. Conversely, apoptosis induction pathway is modified during monocytic differentiation of HL60 cells induced by phorbol esters. Lastly, poly(ADP-ribosyl)ation and chromatine structure should regulate apoptotic DNA fragmentation that is prevented by 3-aminobenzamide and spermine, respectively.
| Translated title of the contribution | Apoptosis induction in human leukemic cells by topoisomerase I and II inhibitors |
|---|---|
| Original language | French |
| Pages (from-to) | 205-212 |
| Number of pages | 8 |
| Journal | Bulletin du Cancer |
| Volume | 83 |
| Issue number | 3 |
| Publication status | Published - 1 Jan 1996 |
| Externally published | Yes |