期刊
LEUKEMIA
卷 31, 期 2, 页码 292-300出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/leu.2016.209
关键词
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资金
- Associazione Italiana per la Ricerca sul Cancro (AIRC) [14481]
- Italian Ministry of Education, University and Research (FIRB (Futuro in Ricerca)) [RBFR086EW9_001]
- University of Padova (Progetti di Ricerca di Ateneo) [CPDA114940/11]
- AIRC IG
- 'Fondazione Umberto Veronesi', Milan, Italy
Protein kinase CK2 sustains acute myeloid leukemia cell growth, but its role in leukemia stem cells is largely unknown. Here, we discovered that the CK2 catalytic a and regulatory beta subunits are consistently expressed in leukemia stem cells isolated from acute myeloid leukemia patients and cell lines. CK2 inactivation with the selective inhibitor CX-4945 or RNA interference induced an accumulation of leukemia stem cells in the late S-G2-M phases of the cell cycle and triggered late-onset apoptosis. As a result, leukemia stem cells displayed an increased sensitivity to the chemotherapeutic agent doxorubicin. From a molecular standpoint, CK2 blockade was associated with a downmodulation of the stem cell-regulating protein BMI-1 and a marked impairment of AKT, nuclear factor-kappa B (NF-kappa B) and signal transducer and activator of transcription 3 (STAT3) activation, whereas FOXO3a nuclear activity was induced. Notably, combined CK2 and either NF-kappa B or STAT3 inhibition resulted in a superior cytotoxic effect on leukemia stem cells. This study suggests that CK2 blockade could be a rational approach to minimize the persistence of residual leukemia cells.
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