Abstract
Epitope-based peptide vaccines encompass minimal immunogenic regions of protein antigens to allow stimulation of precisely targeted adaptive immune responses. However, because efficacy is largely determined by the functional status of antigen-presenting cells (APCs) that acquire and present peptides to cells of the adaptive immune system, adjuvant compounds are needed to enhance immunogenicity. We present here a vaccine consisting of an allergen-derived peptide conjugated to a prodrug of the natural killer–like T (NKT) cell agonist α-galactosylceramide, which is highly effective in reducing inflammation in a mouse model of allergic airway inflammation. Unlike other peptide-adjuvant conjugates that directly activate APCs through pattern recognition pathways, this vaccine encourages third-party interactions with NKT cells to enhance APC function. Therapeutic efficacy was correlated with marked increases in the number and functional activity of allergen-specific cytotoxic T lymphocytes (CTLs), leading to suppression of immune infiltration into the lungs after allergen challenge in sensitized hosts.
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Acknowledgements
We thank the personnel of the Biomedical Research Unit of the Malaghan Institute of Medical Research for animal husbandry, K. Price for flow cytometry support, and the US National Institutes of Health Tetramer Core Facility (contract HHSN272201300006C) for provision of CD1d monomers. This research was supported by the New Zealand Ministry of Science and Innovation (C08X0808) and a research grant from the New Zealand Health Research Council to F.R. N.J.D. was supported by the Rotary Club of Wellington and the University of Otago.
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I.F.H. and G.F.P. led the investigation together, contributed to design of conjugates, designed in vivo experiments and interpreted data; R.J.A. was primarily responsible for design, synthesis and chemical analysis of the conjugates, with contributions from B.J.C., C.M.H., K.A.J. and D.S.L.; C.T. was primarily responsible for in vivo analysis of conjugates, with contributions from D.A.K.; O.G. conducted in vitro assessment of conjugates; N.J.D. performed allergic airway experiments with contributions from H.C.P.; K.A.J. conducted molecular modeling; F.R. led analysis of airway inflammation; P.M.F. reviewed histology; I.F.H. drafted the manuscript with editorial input from all authors.
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Two PCT applications have been filed with the Intellectual Property Office of New Zealand: application no. NZ2013/000224 (with G.F.P., R.J.A., B.J.C., C.M.H, I.F.H., F.R. and D.S.L), filed 6 December 2013, and no. NZ2013/000133 (G.F.P., R.J.A., B.J.C., C.M.H, I.F.H. and D.S.L), filed 26 July 2013. These applications encompass a-GalCer peptide conjugates and prodrugs, such as compounds 4 and 5 described in this work. The intellectual property is assigned to VicLink, Victoria University of Wellington.
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Anderson, R., Tang, Cw., Daniels, N. et al. A self-adjuvanting vaccine induces cytotoxic T lymphocytes that suppress allergy. Nat Chem Biol 10, 943–949 (2014). https://doi.org/10.1038/nchembio.1640
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DOI: https://doi.org/10.1038/nchembio.1640
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