[No authors listed]
In this study, we demonstrate the involvement of DNAM-1-triggering receptor and its ligands, poliovirus receptor (PVR) and Nectin-2, in natural killer (NK) cell-mediated lysis of dendritic cells (DCs). The surface expression of both ligands was up-regulated in DCs as compared to monocytes. It reached maximal densities after DC maturation induced by different stimuli including lipopolysaccharide (LPS), poly I:C, flagellin, and CD40L. Both immunohistochemical analysis and confocal microscopy revealed expression of DNAM-1 ligands by DCs in lymph nodes in which they were localized in the parafollicular T-cell region and surrounded the high endothelial venules. Remarkably, in cytolytic assays, DNAM-1 cooperated with NKp30 in the NK-mediated killing of both immature and mature DCs and the degree of contribution of DNAM-1 appeared to correlate with the surface densities of its specific ligands PVR and Nectin-2.
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