Abstract
Although high brain and acute leukemia, cytoplasmic (BAALC) expression is a well-characterized poor prognostic factor in acute myeloid leukemia (AML), neither the exact mechanisms by which BAALC drives leukemogenesis and drug resistance nor therapeutic approaches against BAALC-high AML have been properly elucidated. In this study, we found that BAALC induced cell-cycle progression of leukemia cells by sustaining extracellular signal-regulated kinase (ERK) activity through an interaction with a scaffold protein MEK kinase-1 (MEKK1), which inhibits the interaction between ERK and MAP kinase phosphatase 3 (MKP3/DUSP6). BAALC conferred chemoresistance in AML cells by upregulating ATP-binding cassette proteins in an ERK-dependent manner, which can be therapeutically targeted by MEK inhibitor. We also demonstrated that BAALC blocks ERK-mediated monocytic differentiation of AML cells by trapping Krüppel-like factor 4 (KLF4) in the cytoplasm and inhibiting its function in the nucleus. Consequently, MEK inhibition therapy synergizes with KLF4 induction and is highly effective against BAALC-high AML cells both in vitro and in vivo. Our data provide a molecular basis for the role of BAALC in regulating proliferation and differentiation of AML cells and highlight the unique dual function of BAALC as an attractive therapeutic target against BAALC-high AML.
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Acknowledgements
We thank Dr T Kitamura for platinum-A (Plat-A) packaging cells, Dr H Miyoshi for lentiviral vectors of CSII-EF-MCS-IRES2-Venus, CSII-EF-MCS-IRES2-hKO1, pENTR4-H1tetOx1, CSIV-TRE-RfA-EF-KT, psPAX2 and pMD2.G, Dr E Takekawa for CA-MEK1 and MEKK1, Dr T Furukawa for MKP3, Dr S Yamanaka for KLF4, Dr M Ogata for ERK1 and Dr A de la Chapelle for BAALC.
Author Contributions
KM designed research, performed experiments, analyzed data and wrote the manuscript. YM designed and supervised research, and wrote the manuscript. KK designed research. HY and SM supervised two-hybrid screening. JK, YK and TS commented on the research direction and wrote the manuscript. MK initiated the study, supervised research direction and wrote the manuscript.
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Morita, K., Masamoto, Y., Kataoka, K. et al. BAALC potentiates oncogenic ERK pathway through interactions with MEKK1 and KLF4. Leukemia 29, 2248–2256 (2015). https://doi.org/10.1038/leu.2015.137
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DOI: https://doi.org/10.1038/leu.2015.137
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