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Interleukin-3 and interferon beta cooperate to induce differentiation of monocytes into dendritic cells with potent helper T-cell stimulatory properties

Interleukin-3 and interferon beta cooperate to induce differentiation of monocytes into dendritic cells with potent helper T-cell stimulatory properties

Blood 99(3): 993-998

It was observed that interferon beta (IFN-beta) prevents the down-regulation of the interleukin-3 receptor alpha chain (IL-3Ralpha), which spontaneously occurs during culture of human monocytes. The functionality of IL-3R was demonstrated by the fact that IL-3 rescued IFN-beta-treated monocytes from apoptosis. Monocytes cultured in the presence of IFN-beta and IL-3 acquire a dendritic morphology and express high levels of HLA antigen class I and class II and costimulatory molecules. When stimulated by either lipopolysaccharide or fibroblasts expressing CD40 ligand (CD40L) transfectants, dendritic cells (DCs) generated in IFN-beta and IL-3 secreted high levels of IL-6, IL-8, and tumor necrosis factor-alpha but low levels of IL-12 in comparison with DCs generated in IL-4 and granulocyte-macrophage colony-stimulating factor (GM-CSF). In mixed leukocyte culture, IL-3-IFN-beta DCs induced a vigorous proliferative response of allogeneic cord blood T cells and elicited the production of high levels of IFN-gamma and IL-5 by naive adult CD4+ T cells. Finally, IL-3-IFN-beta DCs were found to produce much higher levels of IFN-alpha than IL-4-GM-CSF DCs in response to Poly (I:C) but not to influenza virus. It was concluded that monocytes cultured in the presence of IL-3 and IFN-beta differentiate into DCs with potent helper T-cell stimulatory capacity despite their low secretion of IL-12.

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Accession: 010867865

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PMID: 11807004

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