Effect of cytotoxic drugs on mature neutrophil function in the presence and absence of granulocyte-macrophage colony-stimulating factor.

J M Humphreys, R E Stringer, C A Hart, S W Edwards

Index: Br. J. Haematol. 84(2) , 316-21, (1993)

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Abstract

The effects of the cytotoxic drugs, adriamycin, cyclophosphamide, daunomycin (daunorubicin), prednisolone, actinomycin D, azacytidine and vincristine at concentrations of 1 microM on mature neutrophil function were examined. Up to 5 h incubation with adriamycin, azacytidine, cyclophosphamide, daunomycin and prednisolone had no effect on either luminol chemiluminescence or superoxide secretion. However, after 15 min or 1 h (but not 5 h) incubation vincristine enhanced fMet-Leu-Phe stimulated chemiluminescence, whilst after 5 h incubation with actinomycin D the ability of neutrophils to generate reactive oxidants in response to all stimuli tested was impaired: after 5 h incubation with adriamycin reactive oxidant production was also impaired, but only when fMet-Leu-Phe was used as stimulant. All of the drugs tested except azacytidine inhibited neutrophil oxidant production after 5 h incubation in the presence of granulocyte-macrophage colony-stimulating factor (GM-CSF). Actinomycin D and cyclophosphamide also inhibited GM-CSF stimulated protein biosynthesis. These data indicate that cytotoxic drugs may compromise the potentially beneficial effects of CSFs on mature neutrophil function during therapy.