Abstract
IL-15 and SCF fail to induce NK differentiation and proliferation of CD34+ hematopoietic progenitors from chronic myeloid leukemia patients in contrast to normal stem cells although, both normal and leukemic CD34+ cells display comparable expression of c-kit or IL-15 receptor subunits. Interestingly, confocal microscopy analysis revealed that leukemic and most normal CD34+ cells produce and secrete IL-15, as shown by its trafficking through the Golgi apparatus and early endosomes. However, only leukemic progenitors express the membrane bound IL-15. Colocalization and internalization of IL-15Rβ/γc and IL-15Rα/γc complexes indicated that IL-15 was specifically uptaken by leukemic progenitors. We also demonstrated that in both normal and leukemic progenitors, the signaling kinase Jak3 is constitutively pre-associated with the γc chain. Anti-IL-15 neutralizing mAb treatment resulted in down-regulation of γc chain and disruption of γc/Jak3 interaction in normal but had no effect in leukemic progenitors. Our results suggest the existence in both normal and leukemic CD34+ cells of a constitutive production of a bioactive IL-15 that does not lead to NK differentiation and further indicate that membrane bound IL-15 and constitutive activation of γc are hallmarks of leukemic progenitors.
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Acknowledgements
We would like to thank Yann Lécluse for immunofluorescence analyses and Maryvonne Guillard for excellent technical assistance. This work was supported by INSERM, IFR 54 Institute Gustave Roussy, ARC 3055 (Villejuif, France) and LNCC (comité Val de Marne, France).
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Carayol, G., Giron-Michel, J., Azzarone, B. et al. Altered natural killer cell differentiation in CD34+ progenitors from Chronic Myeloid Leukemia patients. Oncogene 19, 2758–2766 (2000). https://doi.org/10.1038/sj.onc.1203584
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DOI: https://doi.org/10.1038/sj.onc.1203584