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. 1995 Feb;15(2):772–779. doi: 10.1128/mcb.15.2.772

Constitutive c-myb expression in K562 cells inhibits induced erythroid differentiation but not tetradecanoyl phorbol acetate-induced megakaryocytic differentiation.

D Rosson 1, T G O'Brien 1
PMCID: PMC231948  PMID: 7823945

Abstract

K562 cells were stably transfected with a plasmid vector constitutively expressing a full-length human c-myb gene. Parental cells possess the dual potential of inducibility of cellular differentiation along two lineages, i.e., erythroid and megakaryocytic. The resulting lineage is dependent on the inducing agent, with a number of compounds being competent to various degrees for inducing erythroid differentiation, while the tumor promoter tetradecanoyl phorbol acetate (TPA) induces a macrophage-like morphology with enhanced expression of proteins associated with megakaryocytes. Exogeneous expression of c-myb in transfected cell lines abrogated erythroid differentiation induced by cadaverine or cytosine arabinoside as assessed by hemoglobin production. However, TPA-induced megakaryocytic differentiation was left intact, as assessed by cell morphology, cytochemical staining, and the expression of the megakaryocytic antigens. These results indicate that c-Myb and protein kinase C play important roles in cellular differentiation of K562 cells and suggest that agents which directly modulate protein kinase C can induce differentiation in spite of constitutively high levels of c-Myb.

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Selected References

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