Abstract
Exposure of the various human myeloid leukemic cell lines (HL60 and RDFD) to various compounds results in marked differentiation of the cells. This differentiation is associated with a marked increase in both basal and NaF-stimulated adenylate cyclase (AC) activity. The increase in AC activity occurs regardless of the differentiation inducer one has utilized (retinoic acid (RA), dimethyl formamide (DMF), hypoxanthine (HPX) or actinomycin D (actD) and is correlated with this process, as a variant of the HL60 cell (HL60-Blast) that does not differentiate upon exposure to the various inducers does not demonstrate this increase in AC activity. In addition, the differentiation process is associated with a rapid increase in intracellular cAMP within hours of adding the inducer, followed by a gradual decrease.
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