The ischemia-responsive protein 94 (Irp94) activates dendritic cells through NK cell receptor protein-2/NK group 2 member D (NKR-P2/NKG2D) leading to their maturation

The Journal of Immunology : Official Journal of the American Association of Immunologists
Raghvendra M SrivastavaA Khar

Abstract

Tumor recognition and killing, the uptake of released immunogenic substrate, and the generation of immunity are crucial aspects of dendritic cell (DC)-mediated antitumor immune response. In the context of direct tumoricidal activity, we have recently shown NK cell receptor protein-2 (NKR-P2)/NK group 2 member D (NKG2D) as a potent activation receptor on rat DCs. The activation of DCs with agonistic anti-NKR-P2 mAb, the binding of soluble NKR-P2 to the AK-5 tumor, and DC maturation with fixed AK-5 cells led us to identify a putative NKR-P2 ligand on the AK-5 cell surface. In this study we have shown that the AK-5 tumor-derived ischemia-responsive protein-94 (Irp94, a 110 kDa Hsp family member) acts as a functional ligand for NKR-P2 on DCs and enhances Irp94-NKR-P2 interaction-dependent tumor cell apoptosis via NO. Surface expression of Irp94 was also found on tumors of diverse origin in addition to AK-5. Furthermore, the Th1-polarizing cytokine IL-12, produced from Irp94-ligated BMDCs, augments NK cell cytotoxicity. Irp94-NKR-P2 interaction drives the maturation of BMDCs by up-regulating MHC class II, CD86, and CD1a and also induces autologous T cell proliferation, which displays a crucial state of DCs for adaptive antitumor imm...Continue Reading

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Citations

Aug 6, 2014·European Journal of Immunology·Grazyna GalazkaKrzysztof Selmaj
Oct 16, 2018·Transplant International : Official Journal of the European Society for Organ Transplantation·Vaihere DelauneChristian Toso

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