Abstract
In addition to direct tumor cell cytotoxicity, chemotherapy can mediate tumor reduction through immune modulation of the tumor microenvironment to promote anti-tumor immunity. Mature dendritic cells (DCs) play key roles in priming robust immune responses in tumor-bearing hosts. Here, we screened a panel of 21 anticancer agents with defined molecular targets for their ability to induce direct maturation of DCs. We identified ansamitocin P3, a microtubule-depolymerizing agent, as a potent inducer of phenotypic and functional maturation of DCs. Exposure of both murine spleen-derived and human monocyte-derived DCs to ansamitocin P3 triggered up-regulation of maturation markers and production of pro-inflammatory cytokines, resulting in an enhanced T cell stimulatory capacity. Local administration of ansamitocin P3 induced maturation of skin Langerhans cells in vivo and promoted antigen uptake and extensive homing of tumor-resident DCs to tumor-draining lymph nodes. When used as an adjuvant in a specific vaccination approach, ansamitocin P3 dramatically increased activation of antigen-specific T cells. Finally, we demonstrate that ansamitocin P3, due to its immunomodulatory properties, acts in synergy with antibody-mediated blockade of the T cell inhibitory receptors PD-1 and CTLA-4. The combination treatment was most effective and induced durable growth inhibition of established tumors. Mechanistically, we observed a reduced regulatory T cell frequency and improved T cell effector function at the tumor site. Taken together, our study unravels an immune-based anti-tumor mechanism exploited by microtubule-depolymerizing agents, including ansamitocin P3, and paves the way for future clinical trials combining this class of agents with immunotherapy.
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Acknowledgments
This work was supported by grants from the Swiss National Science Foundation, the Wilhelm-Sander-Foundation, the Cancer League Basel, and the Huggenberger Stiftung. We thank Béatrice Dolder-Schlienger, Mélanie Buchi, and Petra Herzig for excellent technical assistance; Arne Sutter (Merck KGaA) for providing the SP37A3 cell line; the Developmental Therapeutics Program at NCI/NIH for providing ansamitocin P3, vinblastine, vindesine, and vinorelbine; Jean Pieters for providing OT-II mice; and Douglas Fearon and Mark Smyth for providing tumor cell lines. Furthermore, we thank Heinz Läubli, Narasimha Rao Uda, and Matthias Kreuzaler for critical reading of the manuscript.
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K. Martin and P. Müller have contributed equally to this work.
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Martin, K., Müller, P., Schreiner, J. et al. The microtubule-depolymerizing agent ansamitocin P3 programs dendritic cells toward enhanced anti-tumor immunity. Cancer Immunol Immunother 63, 925–938 (2014). https://doi.org/10.1007/s00262-014-1565-4
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DOI: https://doi.org/10.1007/s00262-014-1565-4