Abstract
Using serum-containing culture, we examined whether AGM-S3 stromal cells, alone or in combination with hematopoietic growth factor(s), stimulated the proliferation of CD34+ cells from patients with juvenile myelomonocytic leukemia (JMML). AGM-S3 cells in concert with stem cell factor plus thrombopoietin increased the numbers of peripheral blood CD34+ cells to approximately 20-fold of the input value after 2 weeks in nine JMML patients with either PTPN11 mutations or RAS mutations, who received allogeneic hematopoietic transplantation. Granulocyte-macrophage colony-stimulating factor (GM-CSF) also augmented the proliferation of JMML CD34+ cells on AGM-S3 cells. The expansion potential of CD34+ cells was markedly low in four patients who achieved spontaneous hematological improvement. A large proportion of day-14-cultured CD34+ cells were negative for CD38 and cryopreservable. Cultured JMML CD34+CD38− cells expressed CD117, CD116, c-mpl, CD123, CD90, but not CXCR4, and formed GM and erythroid colonies. Day-7-cultured CD34+ cells from two of three JMML patients injected intrafemorally into immunodeficient mice stimulated with human GM-CSF after transplantation displayed significant hematopoietic reconstitution. The abilities of OP9 cells and MS-5 cells were one-third and one-tenth, respectively, of the value obtained with AGM-S3 cells. Our culture system may provide a useful tool for elucidating leukemogenesis and for therapeutic approaches in JMML.
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Acknowledgements
This work was supported by Grants-in-Aid for Scientific Research (No. 24390260 and No. 22591154) from the Ministry of Education of Japan and grant from the Preventive Medical Center of Shinshu University Hospital.
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Sakashita, K., Kato, I., Daifu, T. et al. In vitro expansion of CD34+CD38− cells under stimulation with hematopoietic growth factors on AGM-S3 cells in juvenile myelomonocytic leukemia. Leukemia 29, 606–614 (2015). https://doi.org/10.1038/leu.2014.239
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DOI: https://doi.org/10.1038/leu.2014.239
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