The involvement of TNF-alpha-related apoptosis-inducing ligand in the enhanced cytotoxicity of IFN-beta-stimulated human dendritic cells to tumor cells

The Journal of Immunology : Official Journal of the American Association of Immunologists
Shuxun LiuXuetao Cao

Abstract

TNF-alpha-related apoptosis-inducing ligand (TRAIL) is characterized by its preferential induction of apoptosis of tumor cells but not normal cells. Dendritic cells (DCs), besides their role as APCs, now have been demonstrated to exert cytotoxicity or cytostasis on some tumor cells. Here, we report that both human CD34(+) stem cell-derived DCs (CD34DCs) and human CD14(+) monocyte-derived DCs (MoDCs) express TRAIL and exhibit cytotoxicity to some types of tumor cells partially through TRAIL. Moderate expression of TRAIL appeared on CD34DCs from the 8th day of culture and was also seen on freshly isolated monocytes. The level of TRAIL expression remained constant until DC maturation. TRAIL expression on immature CD34DCs or MoDCs was greatly up-regulated after IFN-beta stimulation. Moreover, IFN-beta could strikingly enhance the ability of CD34DCs or MoDCs to kill TRAIL-sensitive tumor cells, but LPS did not have such an effect. The up-regulation of TRAIL on IFN-beta-stimulated DCs partially contributed to the increased cytotoxicity of DCS: Pretreatment of TRAIL-sensitive tumor cells with caspase-3 inhibitor could significantly increase their resistance to the cytotoxicity of IFN-beta-stimulated DCS: In contrast, NF-kappaB inhibit...Continue Reading

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