Lipopolysaccharide-induced expression of TRAIL promotes dendritic cell differentiation.
Tumour necrosis factor-related apoptosis inducing ligand (TRAIL) is a death-inducing cytokine whose physiological function is not well understood. Here, we show that TRAIL has a role in programming human dendritic cell (DC) differentiation. TRAIL expression was strongly induced in DCs upon stimulation with lipopolysaccharide (LPS) or Polyinosine-polycytidylic acid (poly(I:C)) stimulation. Blockade of TRAIL with neutralizing antibody partially inhibited LPS-induced up-regulation of co-stimulatory molecules and the expression of inflammatory cytokines including interleukin-12 (IL-12) p70. In addition, neutralization of TRAIL in LPS-treated DCs inhibited the DC-driven differentiation of T cells into interferon-gamma (IFN-gamma) -producing effectors. The effects of TRAIL neutralization in poly(I:C)-treated DCs were similar, except that IL-12 production and the differentiation of effector T cells into IFN-gamma producers were not inhibited. Strikingly, TRAIL stimulation alone was sufficient to induce morphological changes resembling DC maturation, up-regulation of co-stimulatory molecules, and enhancement of DC-driven allogeneic T-cell proliferation. However, TRAIL alone did not induce inflammatory cytokine production. We further show that the effects of TRAIL on DC maturation were not the result of the induction of apoptosis, but may involve p38 activation. Hence, our data demonstrate that TRAIL co-operates with other cytokines to facilitate DC functional maturation in response to Toll-like receptor activation.
Cho
Young S
YS
Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA.
Challa
Sreerupa
S
Clancy
Lauren
L
Chan
Francis K-M
FK
D017209:Apoptosis; D002454:Cell Differentiation; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis / Q000276:immunology; D003713:Dendritic Cells / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism; D006801:Humans; D008070:Lipopolysaccharides / Q000276:immunology*; D015398:Signal Transduction; D053221:TNF-Related Apoptosis-Inducing Ligand / Q000276:immunology* / Q000378:metabolism
D016207:Cytokines; D008070:Lipopolysaccharides; D053221:TNF-Related Apoptosis-Inducing Ligand; C505653:TNFSF10 protein, human
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