Abstract
The effectivity of cancer immunotherapies is hindered by immunosuppressive tumour microenvironments that are poorly infiltrated by effector T cells and natural killer cells. In infection and autoimmune disease, the recruitment and activation of effector immune cells is coordinated by pro-inflammatory T helper 17 (TH17) cells. Here we show that pathogen-mimicking hollow nanoparticles displaying mannan (a polysaccharide that activates TH17 cells in microbial cell walls) limit the fraction of regulatory T cells and induce TH17-cell-mediated anti-tumour responses. The nanoparticles activate the pattern-recognition receptor Dectin-2 and Toll-like receptor 4 in dendritic cells, and promote the differentiation of CD4+ T cells into the TH17 phenotype. In mice, intra-tumoural administration of the nanoparticles decreased the fraction of regulatory T cells in the tumour while markedly increasing the fractions of TH17 cells (and the levels of TH17-cell-associated cytokines), CD8+ T cells, natural killer cells and M1-like macrophages. The anti-tumoural activity of the effector cells was amplified by an agonistic antibody against the co-stimulatory receptor OX40 in multiple mouse models. Nanomaterials that induce TH17-cell-mediated immune responses may have therapeutic potential.
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Data availability
The main data supporting the results in this study are available within the paper and its Supplementary Information. Source data are provided with this paper. All data generated in this study are available from the corresponding authors on reasonable request.
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Acknowledgements
This work was supported in part by NIH (R01DE030691, R01DE031951, R01DK125087, R01CA271799, R01NS122536, U01CA210152 and P30CA046592), David Koch-Prostate Cancer Foundation Award in Nanotherapeutics and National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (2022R1F1A1075064 and 2022R1A2C1006643). A.S.K. acknowledges financial support from the UM CBTP Training Program (NIH T32GM008353). K.S.P. acknowledges financial support from the UM TEAM Training Program (NIH T32DE007057). We thank the NIH Tetramer Core Facility (contract HHSN272201300006C) for provision of MHC-I tetramers; and the University of Michigan Cancer Center Immunology Core for ELISA analysis.
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S.S., J.N. and J.J.M. designed the study. S.S., J.N., A.S.K., K.S.P., M.T.P., J.A. and B.S. performed the experiments. S.S., J.N., W.Z., S.-H.L., J.S., O.C.F. and J.J.M interpreted the data. S.S., J.N. and J.J.M. wrote the paper.
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A patent application for particles for the delivery of biomolecules has been filed, with S.S., O.C.F. and J.J.M. as inventors. O.C.F. has financial interests in Selecta Biosciences, Tarveda Therapeutics, and Seer. J.J.M. declares financial interests for board membership, as a paid consultant, for research funding, and/or as equity holder in EVOQ Therapeutics, Saros Therapeutics and Intrinsic Medicine.
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Extended data
Extended Data Fig. 1 A schematic illustration of Mann-NC synthesis.
A negatively charged template silica nanoparticle was coated with branched polyethyleneimine (PEI, 25 kDa) polymer in ultra-pure water, followed by a chemical crosslinking step. The surface of PEI-coated silica nanoparticle was reacted with oxidized mannan polymers by the aldehyde-amine reaction. Then the silica nanoparticle core was selectively removed, resulting in hollow Mann-NC entirely composed of mannan polymers.
Extended Data Fig. 2 Phenotype and activity of CD4 T cells induced by Mann-NC.
(a) DCs stimulated by Mann-NC trigger the differentiation of CD4 + T-cells toward Th17 phenotype. BMDCs isolated from BDC2.5 TCR transgenic mice were treated with p31 MHC-II epitope with and without Mann-NC. After overnight incubation, p31-specific CD4 + T-cells from BDC2.5 TCR transgenic mice were added and cultured for 3 days. IL-17A released into the media was measured by ELISA, and CD4 + T-cells expressing IL-17A was measured by intracellular cytokine staining. (b) Mann-NC-inducing OX40 expression levels of Foxp3 + CD4 + T-cells and representative contour plots. (c-f) Tumor-draining lymph nodes were analysed for the frequencies of (c) CD4 + T-cells, (d) IL17 + CD4 + Th17 cells, (e) Foxp3 + CD4 + Tregs, and (f) the corresponding Th17/Treg ratio. (g) CT26 tumor-bearing mice were treated with Mann-NC as in Fig. 3a, and CD4 + T-cells in the TME on day 15 were analysed for their subsets. Data represent mean ± SEM, from a representative experiment (n = 4 (a); n = 7 (b); n = 7 for Native-Mann and Mann-NC, or 8 for PBS on day 15, or 10 for PBS on day 12 (c-f); or n = 8 (g) biologically independent samples) from two (a,b,g) or three (c-f) independent experiments. ***P < 0.001, ****P < 0.0001, analysed by one-way (a) or two-way (c-f) ANOVA with Bonferroni’s multiple comparisons test or unpaired two-tailed Student’s t-test (b, g).
Extended Data Fig. 3 Cellular uptake of Mann-NC among tumor cells and innate immune cells in local tumors.
BALB/c mice were inoculated subcutaneously with 1.5 × 105 CT26 cells on day 0 and treated by intratumoral administration of Cy5.5-Mann-NC on day 9. After 3 days, tumor tissues were analysed for Cy5.5+ cells among CD45- tumor cells, CD11c + DCs, Ly6C+ monocytes, F4/80+ macrophages, and Ly6G+ neutrophils. Data represent mean ± SEM, from a representative experiment with n = 5 biologically independent samples from two independent experiments.
Extended Data Fig. 4 Representative contour plots.
Shown are representative contour plots of IFN-γ + CD8 T-cells, granzyme B + CD8 + T-cells, IFN-γ + NK cells, and granzyme B + NK cells for the dataset shown in the main Fig. 5e-f.
Extended Data Fig. 5 Representative contour plots.
Shown are the representative contour plots of CD80 + CD11c + DCs, CD103 + CD11c + DCs, and CD8𝛼 + CD103 + CD11c + DCs for the dataset shown in the main Fig. 7a.
Extended Data Fig. 6 Immunofluorescence analysis of IL-17A expression.
Immunofluorescence images of IL-17A expression among CD4 T-cells and CD8 T-cells in TME on day 15. Scale bar represents 50 μm.
Extended Data Fig. 7 Immunofluorescence analysis of IFN-γ expression.
Immunofluorescence images of IFN-γ expression among CD4 T-cells and CD8 T-cells in TME on day 15. Scale bar represents 50 μm.
Supplementary information
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Source data
Source Data Figs. 3–8
Source data for tumour size.
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Son, S., Nam, J., Kim, A.S. et al. Induction of T-helper-17-cell-mediated anti-tumour immunity by pathogen-mimicking polymer nanoparticles. Nat. Biomed. Eng 7, 72–84 (2023). https://doi.org/10.1038/s41551-022-00973-4
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DOI: https://doi.org/10.1038/s41551-022-00973-4
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