Abstract
We identified nicotinamide phosphoribosyltransferase (NAMPT), also known as pre-B cell colony enhancing factor (PBEF), as an essential enzyme mediating granulocyte colony-stimulating factor (G-CSF)-triggered granulopoiesis in healthy individuals and in individuals with severe congenital neutropenia. Intracellular NAMPT and NAD+ amounts in myeloid cells, as well as plasma NAMPT and NAD+ levels, were increased by G-CSF treatment of both healthy volunteers and individuals with congenital neutropenia. NAMPT administered both extracellularly and intracellularly induced granulocytic differentiation of CD34+ hematopoietic progenitor cells and of the promyelocytic leukemia cell line HL-60. Treatment of healthy individuals with high doses of vitamin B3 (nicotinamide), a substrate of NAMPT, induced neutrophilic granulocyte differentiation. The molecular events triggered by NAMPT include NAD+-dependent sirtuin-1 activation, subsequent induction of CCAAT/enhancer binding protein-α and CCAAT/enhancer binding protein-β, and, ultimately, upregulation of G-CSF synthesis and G-CSF receptor expression. G-CSF, in turn, further increases NAMPT levels. These results reveal a decisive role of the NAD+ metabolic pathway in G-CSF-triggered myelopoiesis.
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Acknowledgements
We thank M. Uenalan for helpful discussion, M. Morgan for critically reading the manuscript and M. Ballmaier and C. Reimer for assistance in cell sorting. We also thank C. Zeidler and the physicians within the Severe Chronic Neutropenia International Registry for providing subject material (bone marrow cells, peripheral blood neutrophils and plasma). Special thanks to study subjects and colleagues, especially M. Schatz, for their great cooperation. This work was supported by Elternverein Krebskranker Kinder Hannover e.V., Madeleine-Schickedanz-Kinderkrebsstiftung, Deutsche José Carreras Leukämia Stiftung e.V., REBIRTH Excellence Cluster (A.S.), Else Kröner Foundation (A.S.), an American Federation for Aging Research senior postdoctoral fellowship (F.W.) and the US Department of Agriculture and National Institutes of Health (Q.T.).
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K.W. and J.S. made initial observations, designed the main experiments, analyzed the data, supervised experimentation and wrote the manuscript; J.S. and D.L. performed the main experiments; B.K.T. performed western blotting and immunoprecipitation experiments; A.M.B. cloned and prepared plasmids for transfection experiments; K.G. introduced mutations into G-CSF and G-CSFR reporter gene constructs; L.H. cloned G-CSFR shRNA; F.W. and Q.T. provided plasmids for SIRT1, C/EBP-α and C/EBP-β, performed immunoprecipitation experiments in 293T cells and discussed the manuscript; A.S. designed NAMPT lv constructs and produced viral supernatants; G.C., M.G. and M.S. discussed the project and manuscript; G.M. and M.G. provided FK866 and helped to measure NAD+; K.W. coordinated the project and wrote the manuscript.
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Skokowa, J., Lan, D., Thakur, B. et al. NAMPT is essential for the G-CSF–induced myeloid differentiation via a NAD+–sirtuin-1–dependent pathway. Nat Med 15, 151–158 (2009). https://doi.org/10.1038/nm.1913
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DOI: https://doi.org/10.1038/nm.1913
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