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A transitory increase in ornithine decarboxylase (ODC) activity is shown not to be a prerequisite for the differentiation induced by hexamethylene bisacetamide (HMBA) in murine erythroleukemic (MEL) cells. On the contrary, conditions are described, where inhibition of the ODC activity with alpha-difluoromethyl ornithine (DFMO) stimulated the induced differentiation. Polyamine analysis demonstrated that a reduction in intracellular putrescine and spermidine occurred in MEL cells before commitment to erythrodifferentiation. The presence of DFMO increased the rapidity and the amplitude of these changes. No effect of dexamethasone on these changes in ODC activity or intracellular polyamines was observed.
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