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Co-induction of c-fos and junB during the latent period preceding commitment of Friend erythroleukemia cells to differentiation.

Chemically induced differentiation of Friend murine erythroleukemia cells (F-MELC) is a multistep process with a latent period of about 12 h preceding irreversible commitment to terminal maturation. To gain understanding of the early genetic response of F-MELC to the dimethyl sulfoxide (DMSO) inducer of F-MELC differentiation, we have investigated by Northern blot analysis the expression of fos and jun family genes that encode components of the transcription factor AP-1 complex. Our results show that c-jun mRNA is not detected at any time in untreated and DMSO-treated F-MELC. In contrast, DMSO-induced differentiation of F-MELC is associated with an early and transient induction of c-fos and junB mRNAs by 2 to 8 h treatment while in presence of dexamethasone, an inhibitor of F-MELC commitment, c-fos mRNA is not detected and junB mRNA remains at basal levels. junD mRNA is detected at low levels in untreated F-MELC and remains unchanged during DMSO treatment. Furthermore, DMSO treatment in a F-MELC cell line resistant to DMSO-differentiation does not result in an early induction of c-fos and junB mRNAs. Taken together, these results indicate that the DMSO-induced F-MELC differentiation is accompanied by an early co-induction of c-fos and junB during the latent period preceding the commitment to erythroid maturation.