Abstract
A metal chelator, diethyldithiocarbamate (DDC) perturbs the chromosome condensation processes in dividing cells. The length of the metaphase chromosomes in Chinese hamster cells (V79) treated with 17.2 micrograms/ml of DDC for 2 hr is about half of that in untreated cells. However, concentrations of 1.7 microgram or 172 micrograms/ml DDC apparently do not produce this effect. DDC at 17.2 micrograms/ml also disrupts spindle fibers. Penicillamine, EDTA, EGTA, and diamide show no effect on chromosome condensation. Bleomycin, but not mitomycin and cisplatin, added simultaneously with DDC can prevent the DDC effect on chromosomes. The cytotoxic effect of increasing concentrations of DDC to V79 cells incubated at 37 degrees C exhibits a similar biphasic response. This concentration biphasic toxic effect is not altered when the cells are treated with DDC in combination with radiation, heat, or other cytotoxic drugs. These observations suggest that the different effects of DDC concentrations on chromosome condensation should be considered as one important modification factor for DDC related toxicity.
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