Mcl-1, an early-induction molecule, modulates activin A-induced apoptosis and differentiation of CML cells

Oncogene
Y FukuchiY Ikeda

Abstract

Activin A, one member of the transforming growth factor (TGF)-beta superfamily, is known to be a commitment factor for cell death and differentiation. In the present study, we demonstrate that human chronic myeloid leukemia (CML) cell lines, KU812 and K562 cells, either induced apoptosis or differentiation, respectively, by treatment with activin A. During these cell fate decisive events caused by activin A, rapid and transient up-regulation of Mcl-1 was observed in both cell lines. In activin A-induced apoptosis of KU812 cells, continuous up-regulation of Bax was observed. After the decrease in Mcl-1 expression had occurred, activation of caspase-9 and caspase-3 and cleavage of DFF45 were shown to take place in KU812 cells, resulting in the fragmentation of the genomic DNA of the cells. In contrast, the down-regulation of Mcl-1 without up-regulation of Bax caused accumulation of hemoglobin (Hb) contents in activin A-treated K562 cells. Interestingly, erythropoietin (EPO) prevented activin A-induced apoptosis with continuous expression of Mcl-1 and caused KU812 cells to undergo erythroid differentiation. To address the role of Mcl-1 in activin A-treated CML cells, KU812 and K562 cells were stably transfected with cDNA encoding ...Continue Reading

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