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Comparative in Vitro Effects of Cyclophosphamide Derivatives on Murine Bone Marrow-derived Stromal and Hemopoietic Progenitor Cell Classes¹

Department of Cell Biology and Genetics, Erasmus University, P. O. Box 1738, 3000 DR Rotterdam, The Netherlands

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.

¹ This work was supported by the Netherlands Cancer Foundation (Queen Wilhelmina Fund, IKR 08).

² To whom requests for reprints should be addressed.

Received 4/15/85. Accepted 6/ 4/85.