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The role of phosphorylation of MLF2 at serine 24 in BCR-ABL leukemogenesis

Abstract

Chronic myelogenous leukemia (CML) is a myeloproliferative disorder defined by the presence of the fusion gene BCR-ABL1 in primitive hematopoietic progenitors. The myeloid leukemia factors (MLFs) were identified in the fly and human, and are involved in acute leukemia and enhancing the myeloid factor; however, the function of MLF2 in CML is poorly understood. In this study, we demonstrated that MLF2 may play an oncogenic role in CML. The expression level of MLF2 was related to the proliferation, colony-formation ability, and sensitivity to imatinib in K562 cells. Moreover, phosphorylation at serine 24, detected through Phos-tag sodium dodecyl sulfate-polyacrylamide gel electrophoresis, was required to maintain the activity of MLF2 in CML. The effects of MLF2 overexpression on the colony-formation ability in vitro and mouse survival in vivo could be alleviated by point mutation of MLF2 at serine 24. These findings uncover the oncogenic role of MLF2 through phosphorylation at serine 24 and provide a novel therapeutic target in CML.

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Fig. 1: Effects of MLF2 on the malignant progression of CML.
Fig. 2: Effects of targeting MLF2 in K562 cells.
Fig. 3: Phosphorylation at S24 is sufficient to maintain the activity of MLF2.
Fig. 4: Effects of MLF2 phosphorylation at S24 on a CML xenograft murine model.
Fig. 5: Signaling pathways downstream of MLF2.

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Funding

This work was supported by grants from the National Natural Science Foundation of China (No. 81170496), Research Project for Practice Development of National TCM Clinical Research Bases (No. JDZX2015119), Science and Technology Program of Guangdong Province (Nos. 2014A020212729, 2016A020226027), Science and Technology Program of Guangzhou City (No. 201504281729050), and the Fundamental Research Funds for the Central Universities (No. 21617461).

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JF conceived and designed the experiments. JY, YZ, and GH performed the experiments. JY, YL, DC, and GH analyzed the data. OR, ZY, CG, and YL contributed reagents, materials, and analytical tools. DC, OR, and CS prepared the normal and patients sample. JF, JY, and ZY wrote the paper.

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Correspondence to Jia Fei.

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The authors declare that they have no conflict of interest.

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Yang, J., Cao, D., Zhang, Y. et al. The role of phosphorylation of MLF2 at serine 24 in BCR-ABL leukemogenesis. Cancer Gene Ther 27, 98–107 (2020). https://doi.org/10.1038/s41417-019-0152-4

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