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Demonstration that human mast cells arise from a progenitor cell population that is CD34(+), c-kit(+), and expresses aminopeptidase N (CD13).
Blood 1999 October 2
Human mast cells are known to arise from a CD34(+)/c-kit(+) progenitor cell population that also gives rise to neutrophils, eosinophils, basophils, and monocytes. To further characterize cells within the CD34(+)/c-kit(+) population that yield mast cells, this progenitor was additionally sorted for CD13, a myeloid marker known to appear early on rodent mast cells and cultured human mast cells, but not expressed or expressed at low levels on human tissue mast cells; and cultured in recombinant human (rh) stem cell factor (rhSCF), rh interleukin-3 (rhIL-3; first week only), and rhIL-6. Initial sorts revealed that although the majority of cells in culture arose from the CD34(+)/c-kit(+)/CD13(-) cell population, mast cells arose from a CD34(+)/c-kit(+)/CD13(+) progenitor cell that also gave rise to a population of monocytes. Sequential sorting confirmed that CD34(+)/c-kit(+)/CD13(+) cells in CD34(+)/c-kit(+)/CD13(-) sorts gave rise to the few mast cells observed in CD13(-) sorted cells. CD34(+)/c-kit(+)/CD13(+) cells plated as single cells in the presence of various cytokine combinations gave rise to pure mast cell, monocyte, or mixed mast cell/monocyte progeny. Addition of either rh granulocyte-macrophage colony-stimulating factor (rhGM-CSF) or rhIL-5 to the CD34(+)/c-kit(+)/CD13(+) progenitor cell population cultured in rhSCF, rhIL-3, and rhIL-6 did increase the number of total cells cultured and in the case of rhIL-5, did increase total mast cell numbers. Neither rhGM-CSF or rhIL-5 led to additional cell populations, ie, even with the addition of rhGM-CSF or rhIL-5, only mast cells and monocytes grew from CD34(+)/c-kit(+)/CD13(+) cells. Thus, human mast cells and a population of monocytes arise from precursor cells that express CD34, c-kit, and CD13; and within which, are mast cell, monocyte, and mast/monocyte (bipotential) precursors.
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