Abstract
We established test conditions for colony-forming unit assay using rat bone marrow cells in which the colony specimens can be preserved. In our test system, all colonies can be transferred from a petri dish to a slide glass with whole agar medium because the agar medium volume is small and movable, enabling the agar medium to be dried and then fixed on the slide glass. Appropriate conditions for the colony-forming unit granulocyte–macrophage assay were as follows: 10 to 30 ng/ml recombinant murine granulocyte and macrophage colony-stimulating factor, 1 × 105 cells/dish, and culture periods of 3 days for neutrophil colonies and 8 days for macrophage colonies. Appropriate conditions for the colony-forming unit erythroid assay were as follows: 2 IU/ml recombinant human erythropoietin, 0.25 to 1 × 105 cells/dish, and culture period of 2–3 days. We also examined responses of bone marrow toxicants 5-fluorouracil and doxorubicin in these test systems, finding that both compounds decreased the numbers of colonies in a concentration-dependent manner in both assays. These findings suggest that these test systems are useful tools in evaluating bone marrow toxicity of these particular compounds.
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