We have shown that nanoparticles (NPs) can be used as ligand-multimerization platforms to activate specific cellular receptors in vivo. Nanoparticles coated with autoimmune disease-relevant peptide-major histocompatibility complexes (pMHC) blunted autoimmune responses by triggering the differentiation and expansion of antigen-specific regulatory T cells in vivo. Here, we define the engineering principles impacting biological activity, detail a synthesis process yielding safe and stable compounds, and visualize how these nanomedicines interact with cognate T cells. We find that the triggering properties of pMHC–NPs are a function of pMHC intermolecular distance and involve the sustained assembly of large antigen receptor microclusters on murine and human cognate T cells. These compounds show no off-target toxicity in zebrafish embryos, do not cause haematological, biochemical or histological abnormalities, and are rapidly captured by phagocytes or processed by the hepatobiliary system. This work lays the groundwork for the design of ligand-based NP formulations to re-program in vivo cellular responses using nanotechnology.
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We thank S. Thiessen, J. Erickson and J. Luces for technical assistance, and L. Kennedy for flow cytometry. We acknowledge T. DiLorenzo for providing JurMA cells, H. Benediktsson for structural analyses of kidney TEM, R. Interior for amino acid analysis, W. White and D. Cramb for assistance with GD-mass spectrometry, FTIR and DLS, T. Furstenhaupt and W. Dong for SEBD and TEM, J.M. Rebled, A. Garcia, R. Rivera and A. Martínez from the TEM–SEM unit from the University of Barcelona (CCiT-UB) for TEM analyses of human T-cell clone:pMHC–NP conjugates, and the CMHD Unit at the Lunenfeld–Tanenbaum Institute for haematology and biochemistry. This work was funded by the Collaborative Health Research Program of the Canadian Institutes of Health Research (CIHR) and the Natural Sciences and Engineering Research Council of Canada, the Instituto de Investigaciones Sanitarias Carlos III, the Ministerio de Economia y Competitividad of Spain (MINECO), and the Sardà Farriol Research Programme. X.C.C. was supported by studentships from the AXA Research Fund and the endMS network. K.S. is funded by Eyes’ High/Alberta Innovates-Technology Futures, Alberta Innovates–Health Solutions (AI-HS) and Banting-CIHR fellowships. C.S.U. is supported by AI-HS and Banting-CIHR fellowhips. R.H.N. is supported by studentships from AI-HS and CIHR. S.W.L. was partially supported by a studentship from Fonds de Recherche du Quebec - Nature et Technologies. J.B. was supported by a Rio Hortega fellowship from the Ministry of Economy and Competitiveness of Spain and by a fellowship from the European Association for the Study of Diabetes (EASD). P.Serra is a Ramon y Cajal investigator supported by a Juvenile Diabetes Research Foundation Career Development Award. P.Santamaria is Scientist of the Alberta Innovates-Health Solutions and a scholar of the IISCIII. The JMDRC is supported by the Canadian Diabetes Association (CDA).
P. Santamaria is scientific founder of Parvus Therapeutics Inc. and has a financial interest in the company.
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Singha, S., Shao, K., Yang, Y. et al. Peptide–MHC-based nanomedicines for autoimmunity function as T-cell receptor microclustering devices. Nature Nanotech 12, 701–710 (2017). https://doi.org/10.1038/nnano.2017.56
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