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Prepublished online as a Blood First Edition Paper on August 15, 2002; DOI 10.1182/blood-2002-04-1164.

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2002-04-1164v1
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Blood, 1 January 2003, Vol. 101, No. 1, pp. 143-150

HEMATOPOIESIS

Interferon-gamma switches monocyte differentiation from dendritic cells to macrophages

Yves Delneste, Peggy Charbonnier, Nathalie Herbault, Giovanni Magistrelli, Gersende Caron, Jean-Yves Bonnefoy, and Pascale Jeannin

From the Department of Biology, Centre d'Immunologie Pierre Fabre, Saint Julien en Genevois, France.

Human monocytes differentiate into dendritic cells (DCs) or macrophages according to the nature of environmental signals. Monocytes stimulated with granulocyte-macrophage colony-stimulating factor (GM-CSF) plus interleukin 4 (IL-4) yield DCs. We tested here whether interferon-gamma (IFN-gamma ), a potent activator of macrophages, may modulate monocyte differentiation. Addition of IFN-gamma to IL-4 plus GM-CSF-stimulated monocytes switches their differentiation from DCs to CD14-CD64+ macrophages. IFN-gamma increases macrophage colony-stimulating factor (M-CSF) and IL-6 production by IL-4 plus GM-CSF-stimulated monocytes by acting at the transcriptional level and acts together with IL-4 to up-regulate M-CSF but not IL-6 production. IFN-gamma also increases M-CSF receptor internalization. Results from neutralizing experiments show that both M-CSF and IL-6 are involved in the ability of IFN-gamma to skew monocyte differentiation from DCs to macrophages. Finally, this effect of IFN-gamma is limited to early stages of differentiation. When added to immature DCs, IFN-gamma up-regulates IL-6 but not M-CSF production and does not convert them to macrophages, even in the presence of exogenous M-CSF. In conclusion, IFN-gamma shifts monocyte differentiation to macrophages rather than DCs through autocrine M-CSF and IL-6 production. These data show that IFN-gamma controls the differentiation of antigen-presenting cells and thereby reveals a new mechanism by which IFN-gamma orchestrates the outcome of specific immune responses.

© 2003 by The American Society of Hematology.
 

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