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- W2177783313 abstract "Abstract Purpose: In chronic myelogenous leukemia (CML), leukemic stem cells (LSC) represent a critical target of therapy. However, little is known about markers and targets expressed by LSCs. The aim of this project was to identify novel relevant markers of CML LSCs. Experimental Design: CML LSCs were examined by flow cytometry, qPCR, and various bioassays. In addition, we examined the multipotent CD25+ CML cell line KU812. Results: In contrast to normal hematopoietic stem cells, CD34+/CD38− CML LSCs expressed the IL-2 receptor alpha chain, IL-2RA (CD25). STAT5 was found to induce expression of CD25 in Lin−/Sca-1+/Kit+ stem cells in C57Bl/6 mice. Correspondingly, shRNA-induced STAT5 depletion resulted in decreased CD25 expression in KU812 cells. Moreover, the BCR/ABL1 inhibitors nilotinib and ponatinib were found to decrease STAT5 activity and CD25 expression in KU812 cells and primary CML LSCs. A CD25-targeting shRNA was found to augment proliferation of KU812 cells in vitro and their engraftment in vivo in NOD/SCID-IL-2Rγ−/− mice. In drug-screening experiments, the PI3K/mTOR blocker BEZ235 promoted the expression of STAT5 and CD25 in CML cells. Finally, we found that BEZ235 produces synergistic antineoplastic effects on CML cells when applied in combination with nilotinib or ponatinib. Conclusions: CD25 is a novel STAT5-dependent marker of CML LSCs and may be useful for LSC detection and LSC isolation in clinical practice and basic science. Moreover, CD25 serves as a growth regulator of CML LSCs, which may have biologic and clinical implications and may pave the way for the development of new more effective LSC-eradicating treatment strategies in CML. Clin Cancer Res; 22(8); 2051–61. ©2015 AACR." @default.
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- W2177783313 date "2016-04-14" @default.
- W2177783313 modified "2023-10-13" @default.
- W2177783313 title "Identification of CD25 as STAT5-Dependent Growth Regulator of Leukemic Stem Cells in Ph+ CML" @default.
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- W2177783313 doi "https://doi.org/10.1158/1078-0432.ccr-15-0767" @default.
- W2177783313 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4817228" @default.
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