Journal
NATURE IMMUNOLOGY
Volume 8, Issue 10, Pages 1123-1131Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ni1509
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Catecholamines are important regulators of homeostasis, yet their functions in hematopoiesis are poorly understood. Here we report that immature human CD34(+) cells dynamically expressed dopamine and beta(2)-adrenergic receptors, with higher expression in the primitive CD34(+)CD38(Io) population. The myeloid cytokines G-CSF and GM-CSF upregulated neuronal receptor expression on immature CD34+ cells. Treatment with neurotransmitters increased the motility, proliferation and colony formation of human progenitor cells, correlating with increased polarity, expression of the metalloproteinase MT1-MMP and activity of the metalloproteinase MMP-2. Treatment with catecholamines enhanced human CD34+ cell engraftment of NOD-SCID mice through Wnt signaling activation and increased cell mobilization and bone marrow Sca-1(+)c-Kit(+)Lin(-) cell numbers. Our results identify new functions for neurotransmitters and myeloid cytokines in the direct regulation of human and mouse progenitor cell migration and development.
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