1IMVA - U1184 - Immunologie des Maladies Virales et Autoimmunes (Site de l'Hôpital de Bicêtre - Faculté de Médecine Paris Sud - 63 rue Gabriel Péri 94276 Le Kremlin-Bicêtre Cedex.
Site du CEA de Fontenay-aux-Roses - 10, route du Panorama - BP 6 - 92265 Fontenay-aux-Roses. - France)
Abstract : The development of new immunization strategies requires a better understanding of early molecular and cellular events occurring at the site of injection. The skin is particularly rich in immune cells and represents an attractive site for vaccine administration. Here, we specifically targeted vaccine antigens to epidermal Langerhans cells (LCs) using a fusion protein composed of HIV antigens and a monoclonal antibody targeting Langerin. We developed a fluorescence imaging approach to visualize, in vivo, the vaccine-targeted cells. Studies were performed in nonhuman primates (NHPs) because of their relevance as a model to assess human vaccines. We directly demonstrated that in NHPs, intra-dermally injected anti-Langerin-HIVGag specifically targets epidermal LCs and induces rapid changes in the LC network, including LC activation and migration out of the epider-mis. Vaccine targeting of LCs significantly improved anti-HIV immune response without requirement of an adjuvant. Although the co-injection of the TLR-7/8 synthetic ligand, R-848 (resiquimod), with the vaccine, did not enhance significantly the antibody response, it stimulated recruitment of HLA-DR+ inflammatory cells to the site of immunization. This study allowed us to characterize the dynamics of early local events following the injection of a vaccine-targeted epidermal LCs and R-848. Keywords: Fluorescence imaging r Langerhans cell r Nonhuman primate r Skin r Vaccination Additional supporting information may be found in the online version of this article at the publisher's web-site
https://www.hal.inserm.fr/inserm-02437891 Contributor : Frédéric MartinonConnect in order to contact the contributor Submitted on : Tuesday, January 14, 2020 - 7:33:20 AM Last modification on : Saturday, June 25, 2022 - 10:43:43 PM Long-term archiving on: : Wednesday, April 15, 2020 - 12:55:41 PM
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Nina Salabert, Biliana Todorova, Frédéric Martinon, Raphaël Boisgard, Gerard Zurawski, et al.. Intradermal injection of an anti-Langerin-HIVGag fusion vaccine targets epidermal Langerhans cells in nonhuman primates and can be tracked in vivo. European Journal of Immunology, Wiley-VCH Verlag, 2016, 46, pp.689 - 700. ⟨10.1002/eji.201545465⟩. ⟨inserm-02437891⟩