IL-4 determines eicosanoid formation in dendritic cells by down-regulation of 5-lipoxygenase and up-regulation of 15-lipoxygenase 1 expression

Proceedings of the National Academy of Sciences of the United States of America
R SpanbroekA J Habenicht

Abstract

Dendritic cell (DC) differentiation from human CD34(+) hematopoietic progenitor cells (HPCs) can be triggered in vitro by a combination of cytokines consisting of stem cell factor, granulocyte-macrophage colony-stimulating factor, and tumor necrosis factor alpha. The immune response regulatory cytokines, IL-4 and IL-13, promote DC maturation from HPCs, induce monocyte-DC transdifferentiation, and selectively up-regulate 15-lipoxygenase 1 (15-LO-1) in blood monocytes. To gain more insight into cytokine-regulated eicosanoid production in DCs we studied the effects of IL-4/IL-13 on LO expression during DC differentiation. In the absence of IL-4, DCs that had been generated from CD34(+) HPCs in response to stem cell factor/granulocyte-macrophage colonystimulating factor/tumor necrosis factor alpha expressed high levels of 5-LO and 5-LO activating protein. However, a small subpopulation of eosinophil peroxidase(+) (EOS-PX) cells significantly expressed 15-LO-1. Addition of IL-4 to differentiating DCs led to a marked and selective down-regulation of 5-LO but not of 5-LO activating protein in DCs and in EOS-PX(+) cells and, when added at the onset of DC differentiation, also prevented 5-LO up-regulation. Similar effects were observed ...Continue Reading

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