Comparative in vitro effects of cyclophosphamide derivatives on murine bone marrow-derived stromal and hemopoietic progenitor cell classes.
We investigated the in vitro effects of ASTA-Z-7595, ASTA-Z-7557, ASTA-Z-7654, and 4-hydroperoxycyclophosphamide (4HC) on murine stromal fibroblastoid colony-forming units, committed hemopoietic progenitors (erythroid burst-forming units and granulocyte/macrophage colony-forming units), and pluripotent hemopoietic stem cells assayed by the spleen colony-forming unit (CFU-s) assay. In general, the drugs showed a time-and dose-dependent effect on colony-forming unit survival, and the relative toxicities were in the order in which the drugs are listed above. We found a relative sparing of day 12 CFU-s compared with day 7 CFU-s and committed hemopoietic and stromal progenitors, although colony size of day 12 CFU-s was reduced. Our results support two possible mechanisms for delayed or inadequate hemopoietic reconstitution in clinical studies using bone marrow purged with 4-hydroperoxycyclophosphamide or ASTA-Z-7557, i.e., damage to (a) transplantable stromal cells or (b) the hemopoietic stem cells.
D000818:Animals; D001853:Bone Marrow / Q000187:drug effects*; D016026:Bone Marrow Transplantation; D002470:Cell Survival / Q000187:drug effects; D003520:Cyclophosphamide / Q000031:analogs & derivatives / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D013154:Spleen / Q000187:drug effects
C012358:4-hydroxycyclophosphamide; C037933:Asta Z 7557; D003520:Cyclophosphamide