Abstract
To overcome the suppressive tumor microenvironment and boost the antitumor effect of the immune system, recent studies have focused on a diverse range of immune checkpoint molecules. Several immune checkpoint molecules are currently approved for clinical use, including immunotherapy using antibodies against cytotoxic T-lymphocyte antigen-4 and programmed cell death protein-1. Biomaterials such as particle-based systems, scaffolds, and conjugates have been harnessed to elevate the biological performance of immune modulators in vivo by enhancing their delivery efficiency and in vivo half-life. In particular, microparticles are advantageous for the sustained release of encapsulated immune stimulators and selective intracellular delivery to phagocytic APCs such as dendritic cells and macrophages for activation of cell-mediated immune responses through cytotoxic T cells. Nanoparticles have ideal properties for targeted delivery of immune-regulating molecules to tumor-draining lymph nodes after systemic injection. More recent therapeutic approaches, including combination therapy of immune checkpoint molecules with small molecular anticancer or anti-inflammation drugs, may help to broaden the range of current therapeutic targets and lower side effects. Taken together, particle-based biomaterials could enhance therapeutic outcomes of current biotherapies (antibodies, cells, and genes), and—more importantly—of immunotherapy combined with chemotherapies.
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Acknowledgements
This study was supported by the Agri-Bio Industry Technology Development Program (316028-3) through the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries, Republic of Korea.
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O. Park, G. Yu, H. Jung and H. Mok declare that they have no conflict of interest.
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Ok Park, Gyeonghui Yu and Heejung Jung have contributed equally to this work.
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Park, O., Yu, G., Jung, H. et al. Recent studies on micro-/nano-sized biomaterials for cancer immunotherapy. Journal of Pharmaceutical Investigation 47, 11–18 (2017). https://doi.org/10.1007/s40005-016-0288-2
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DOI: https://doi.org/10.1007/s40005-016-0288-2