Modeling marrow damage from response data: evolution from radiation biology to benzene toxicity.

In vitro cloning assays for hematopoietic myeloid and erythroid precursor cells have been used as screening systems to investigate the hematotoxic potential of environmental chemicals in humans and mice. Granulocyte-monocyte progenitors (CFU-GM) from human umbilical cord blood and from mouse bone marrow (Balb/c and B6C3F1) were cultured in the presence of lead and the benzene metabolite catechol. Erythroid precursors (BFU-E) from human umbilical cord blood were cultured in the presence of lead. The in vitro exposure of the human and murine cells resulted in a dose-dependent depression of the colony numbers. The concentration effect relationship was studied. Results showed that: (1) Based on calculated IC50 values, human progenitors are more sensitive to lead and catechol than are murine progenitors. The dose that caused a 50% decrease in colony formation after catechol exposure was 6 times higher for murine cells (IC50 = 24 micromol/L) than for human cord blood cells (IC50 = 4 micromol/L). Lead was 10-15 times more toxic to human hematopoietic cells (IC50 = 61 micromol/L) than to murine bone marrow cells from both mice strains tested (Balb/c, IC50 = 1060 micromol/L; B6C3F1, IC50 = 536 micromol/L). (2) A lineage specificity was observed after exposure to lead. Human erythroid progenitors (hBFU-E) (IC50 = 3.31 micromol/L) were found to be 20 times more sensitive to the inhibitory effect of lead than were myeloid precursors (hCFU-GM) (IC50 = 63.58 micromol/L). (3) Individual differences in the susceptibility to the harmful effect of lead were seen among cord blood samples. (4) Toxicity of lead to progenitor cells occurred at environmentally relevant concentrations.

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Heuvel

Leppens

Schoeters

1999

Cell Biology and Toxicology

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Modeling marrow damage from response data: evolution from radiation biology to benzene toxicity.

Abstract: Consensus principles from radiation biology were used to describe a generic set of nonlinear, first-order differential equations for modeling toxicity-induced compensatory

Cited by 1 publication

References 28 publications

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