A gold glyco-nanoparticle carrying a Listeriolysin O peptide and formulated with Advax™ delta inulin adjuvant induces robust T-cell protection against listeria infection.
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| Abstract |
In the search for an effective vaccine against the human pathogen, Listeria monocytogenes (Listeria), gold glyconanoparticles (GNP) loaded with a listeriolysin O peptide LLO91-99 (GNP-LLO) were used to immunise mice, initially using a dendritic cell (DC) vaccine approach, but subsequently using a standard parenteral immunisation approach. To enhance vaccine immunogenicity a novel polysaccharide adjuvant based on delta inulin (Advax™) was also co-formulated with the GNP vaccine. Confirming previous results, DC loaded in vitro with GNP-LLO provided better protection against listeriosis than DC loaded in vitro using free LLO peptide. The immunogenicity of GNP-LLO loaded DC vaccines was further increased by addition of Advax™ adjuvant. However, as DC vaccines are expensive and impracticable for prophylactic use, we next asked whether the same GNP-LLO antigen could be used to directly target DC in vivo. Immunisation of mice with GNP-LLO plus Advax™ adjuvant induced LLO-specific T-cell immunity and protection against Listeria challenge. Protection correlated with an increased frequency of splenic CD4(+) and CD8(+) T cells, NK cells and CD8α(+) DC, and Th1 cytokine production (IL-12, IFN-γ, TNF-α, and MCP-1), post-challenge. Enhanced T-cell epitope recruitment post-challenge was seen in the groups that received Advax™ adjuvant. Immunisation with GNP-LLO91-99 plus Advax™ adjuvant provided equally robust Listeria protection as the best DC vaccine strategy but without the complexity and cost, making this a highly promising strategy for development of a prophylactic vaccine against listeriosis.
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| Authors | Estela Rodriguez-Del Rio, Marco Marradi, Ricardo Calderon-Gonzalez, Elisabet Frande-Cabanes, Soledad Penadés, Nikolai Petrovsky, Carmen Alvarez-Dominguez |
| Journal | Vaccine (Vaccine) Vol. 33 Issue 12 Pg. 1465-73 (Mar 17 2015) ISSN: 1873-2518 [Electronic] Netherlands |
| PMID | 25659269 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't) |
| Copyright | Copyright © 2015 The Authors. Published by Elsevier Ltd.. All rights reserved. |
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