Abstract
The threat of new viral outbreaks has heightened the need for ready-to-use vaccines that are safe and effective. Here we show that a subcutaneous vaccine consisting of live Zika virus electrostatically entrapped in a self-adjuvanting hydrogel recruited immune cells at the injection site and provided mice with effective protection against a lethal viral challenge. The hydrogel prevented the escape of the viral particles and upregulated pattern recognition receptors that activated innate antiviral immunity. The local inflammatory niche facilitated the engulfment of the virus by immune cells infiltrating the hydrogel, the processing and cross-presentation of antigens and the expansion of germinal centre B cells and induced robust antigen-specific adaptive responses and immune memory. Inflammatory immune niches entrapping live viruses may facilitate the rapid development of safe and efficacious vaccines.
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Data availability
The main data supporting the results in this study are available within the paper and its Supplementary Information. All data generated in this study, including source data for the figures, are available from figshare with the identifier https://doi.org/10.6084/m9.figshare.22126691.
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Acknowledgements
We thank J. Xuan for the assistance with CLSM data analysis, and Q. Huang and J. Chen for their help with histological analysis. This work was supported by The National Natural Science Foundation of China (22037005 and 21625105) and National Science & Technology Major Project (2016ZX10004001).
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R.T. and X.W. initiated this study. X.W., R.T. and L.H. supervised and supported the research. H.H. performed most experiments including physicochemical characterization, cell experiments and animal experiments. Y.Z., F.T., X.W. and X.X. participated in performing the physicochemical characterization. J.L., Z.T., Y.M.Z., F.T., M.Z. and Y.C. participated in performing the animal experiments. H.H., X.W., Q.G. and S.W. analysed the data. The manuscript was written by H.H., X.W. and R.T. All authors provided critical feedback and helped shape the manuscript.
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Extended data
Extended Data Fig. 1 Vax hydrogel restricted systemic infection in vivo.
IFNAR1−/− mice were injected with PBS, ZIKV, and Vax; n = 5 for each group at days 5–28, and n = 3 for each group at day 52. a, Viral RNA in the spleens, kidneys, liver, hearts, brains and testes of PBS-injected mice was determined by real-time quantitative RT-PCR. L.O.D., limit of detection. b, The weight of testes from IFNAR1−/− mice after injected with PBS, ZIKV, or Vax. c, Representative H&E staining of the testes from IFNAR1−/− mice after injected with PBS, ZIKV, and Vax. d, Survival curves of IFNAR1−/− mice after injection with PBS, ZIKV or ZIKV loaded Vax; n = 6 for each group. All the mice in the Vax injected group survived compared with the 50% survival rate of the WT ZIKV group. Statistical analyses were performed by using log-rank test.
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Hao, H., Wu, S., Lin, J. et al. Immunization against Zika by entrapping live virus in a subcutaneous self-adjuvanting hydrogel. Nat. Biomed. Eng 7, 928–942 (2023). https://doi.org/10.1038/s41551-023-01014-4
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DOI: https://doi.org/10.1038/s41551-023-01014-4
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