IFN-alpha skews monocytes into CD56+-expressing dendritic cells with potent functional activities in vitro and in vivo

The Journal of Immunology : Official Journal of the American Association of Immunologists
Claudia PapewalisMatthias Schott

Abstract

The antitumor effect of IFN-alpha is mediated by the activation of CTLs, NK cells, and the generation of highly potent Ag-presenting dendritic cells (IFN-DCs). In this study, we show that IFN-DCs generated in vitro from monocytes express CD56 on their surface, a marker which has been thought to be specific for NK cells. FACS analyses of CD56(+) and CD56(-) IFN-DCs showed a nearly identical pattern for most of the classical DC markers. Importantly, however, only CD56(+) IFN-DCs exhibited cytolytic activity up to 24% that could almost completely be blocked (-81%) after coincubation with anti-TRAIL. Intracytoplasmatic cytokine staining revealed that the majority of IFN-DCs independently of their CD56 expression were IFN-gamma positive as well. In contrast, CD56(+) IFN-DCs showed stronger capacity in stimulating allogenic T cells compared with CD56(-) IFN-DC. Based on these results, five patients with metastasized medullary thyroid carcinoma were treated for the first time with monocyte-derived tumor Ag-pulsed IFN-DCs. After a long term follow-up (in mean 37 mo) all patients are alive. Immunohistochemical analyses of delayed-type hypersensitivity skin reaction showed a strong infiltration with CD8(+) cells. In two patients no subst...Continue Reading

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