The therapeutic efficacy of anticancer chemotherapies may depend on dendritic cells (DCs), which present antigens from dying cancer cells to prime tumor-specific interferon-γ (IFN-γ)–producing T lymphocytes. Here we show that dying tumor cells release ATP, which then acts on P2X7 purinergic receptors from DCs and triggers the NOD-like receptor family, pyrin domain containing-3 protein (NLRP3)-dependent caspase-1 activation complex ('inflammasome'), allowing for the secretion of interleukin-1β (IL-1β). The priming of IFN-γ–producing CD8+ T cells by dying tumor cells fails in the absence of a functional IL-1 receptor 1 and in Nlpr3-deficient (Nlrp3−/−) or caspase-1–deficient (Casp-1−/−) mice unless exogenous IL-1β is provided. Accordingly, anticancer chemotherapy turned out to be inefficient against tumors established in purinergic receptor P2rx7−/− or Nlrp3−/− or Casp1−/− hosts. Anthracycline-treated individuals with breast cancer carrying a loss-of-function allele of P2RX7 developed metastatic disease more rapidly than individuals bearing the normal allele. These results indicate that the NLRP3 inflammasome links the innate and adaptive immune responses against dying tumor cells.
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We thank I. Couillin (CNRS) and A. Mignon (Cochin Hospital) for helpful discussion and for providing IL-1RA, R. Schreiber (Washington University School of Medicine) for monoclonal antibodies to IL-1α, IL-1β and IL-1R, H. Yang (Feinstein Institute for Medical Research) for antibody to HMGB1, H. Yagita (School of Medicine, Juntendo University) for the N2B2 antibody to mouse TRAIL, J.-C. Guéry (INSERM) for IL12rb2−/− mice, V. Dixit (Pennington Biomedical Research Center) for Pycard−/− mice, M. Albert (Pasteur Institute) for membrane-bound OVA–transfected mouse embryonic fibroblast cells, S. Forget and J. Bombled for access to the genomics platform, V. Vasseur and the Institut Gustave Roussy animal facility for breeding of transgenic mice, I. Martins for help in ATP release screening and A. Boissonnas (INSERM, Curie Institute) for providing OT1-GFP mice. We are deeply indebted to P. Arveux and S. Dabakuyo for useful help with the statistical analyses. The authors are supported by grants from the Ligue Nationale contre le Cancer (to L. Aymeric., G.K. and L.Z.), the Fondation pour la Recherche Médicale (to L. Apetoh., G.K., E.U., F.S. and L.Z.), the European Union (INFLACARE grant), the association for International cancer research (to G.K.) Cancéropôle Ile-de-France, Institut National du Cancer (L.Z., G.K.), Agence Nationale pour la Recherche (to G.K.), the European Molecular Biology Organization (L. Apetoh.), INSERM (A.T.), the National Health, Association pour la recherche sur le cancer RC (to G.M.), National Health and Medical Research Council of Australia, Cancer Council of Victoria, the China Scholarship Council (Y.M.) and the Leukemia Foundation (M.J.S., N.M.M. and N.M.H.). K.V. is the recipient of a European Respiratory Society Fellowship (number 605).
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Ghiringhelli, F., Apetoh, L., Tesniere, A. et al. Activation of the NLRP3 inflammasome in dendritic cells induces IL-1β–dependent adaptive immunity against tumors. Nat Med 15, 1170–1178 (2009). https://doi.org/10.1038/nm.2028
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