Abstract
Activin A, one member of the transforming growth factor (TGF)-β 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 Mcl-1 (designated as KU812/mcl and K562/mcl cells). As in combined effect of activin A and EPO on the parental KU812 cells, activin A induced differentiation, but not apoptosis, of KU812/mcl cells without modulating Bax levels. Activin A-treated K562/mcl cells, as well as parental cells, were only differentiated to erythroid cells. These results suggest that Mcl-1 is an early inducible gene activated by the activin A signaling pathway for both cellular differentiation and apoptosis, and continuous expression of Mcl-1 may be contributed to differentiation signals to the erythroid lineage in CML cells.
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Acknowledgements
The authors thank Dr Y Eto (Central Research Laboratory, Ajinomoto Co., Inc., Kawasaki, Japan) for providing recombinant human activin A, and J Ozawa for technical assistance. This study was supported by grants from the Ministry of Education, Science and Culture of Japan, and the National Grant-in-Aid for the Establishment of a High-Tech Research Center in a Private University.
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Fukuchi, Y., Kizaki, M., Yamato, K. et al. Mcl-1, an early-induction molecule, modulates activin A-induced apoptosis and differentiation of CML cells. Oncogene 20, 704–713 (2001). https://doi.org/10.1038/sj.onc.1204142
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DOI: https://doi.org/10.1038/sj.onc.1204142
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