Gene expression of ornithine decarboxylase in L1210 leukaemia cells exposed to dl-2-difluoromethylornithine in the presence of cadaverine

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Abstract
Cultured mouse L1210 leukaemia cells treated with DL-2-difluoromethylornithine, an irreversible inhibitor of ornithine decarboxylase (EC 4.1.1.17), in the presence of micromolar concentrations of cadaverine, started to overproduce ornithine decarboxylase after an exposure of several weeks. The more than 60-fold excess of the enzyme protein in the drug-treated cells apparently resulted from a strikingly enhanced accumulation of mRNA for the enzyme associated with only a modest (about 2-fold) gene amplification.

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