Nanoparticle adjuvant sensing by TLR7 enhances CD8+ T cell-mediated protection from Listeria monocytogenes infection.

Marie-Ève Lebel; Jean-François Daudelin; Karine Chartrand; Esther Tarrab; Ulrich Kalinke; Pierre Savard; Nathalie Labrecque; Denis Leclerc; Alain Lamarre

Nanoparticle adjuvant sensing by TLR7 enhances CD8+ T cell-mediated protection from Listeria monocytogenes infection.

Marie-Ève Lebel ¹ Jean-François Daudelin ² Karine Chartrand ¹ Esther Tarrab ¹ Ulrich Kalinke ³ Pierre Savard ⁴ Nathalie Labrecque ^{2, 5, 6} Denis Leclerc ⁷ Alain Lamarre ^{1, *}

* Corresponding author

1 INRS-IAF - Institut Armand Frappier

2 Maisonneuve-Rosemont Hospital Research Center

3 Institute for Experimental Infection Research

4 Department of Neurosciences

5 Department of Medicine

6 Department of Microbiology and Immunology

7 Department of Microbiology, Infectiology, and Immunology, Infectious Disease Research Centre

Abstract : Developing new adjuvants and vaccination strategies is of paramount importance to successfully fight against many life-threatening infectious diseases and cancer. Very few adjuvants are currently authorized for human use, and these mainly stimulate a humoral response. However, specific Abs are not sufficient to confer protection against persisting infections or cancer. Therefore, development of adjuvants and immunomodulators able to enhance cell-mediated immune responses represents a major medical need. We recently showed that papaya mosaic virus nanoparticles (PapMV), self-assembled from the coat protein of a plant virus and a noncoding ssRNA molecule, are highly immunogenic in mice. PapMV can be used either as a vaccine delivery platform, through fusion of various epitopes to the coat protein or as adjuvant to enhance humoral immune responses against coadministered Ags or vaccines. However, the mechanisms that confer these immunomodulatory properties to PapMV and its ability to enhance T cell vaccines remain unknown. Using immunization studies in mice, we demonstrate in this paper that PapMV represents a novel TLR7 agonist with strong immunostimulatory properties. More importantly, pretreatment with PapMV significantly improves effector and memory CD8(+) T cell responses generated through dendritic cell vaccination increasing protection against a Listeria monocytogenes challenge.

Document type :

Journal articles

Domain :

Life Sciences [q-bio]

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https://hal-riip.archives-ouvertes.fr/pasteur-01135779
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Submitted on : Wednesday, March 25, 2015 - 8:25:55 PM
Last modification on : Wednesday, April 17, 2019 - 12:21:21 PM

Nanoparticle adjuvant sensing by TLR7 enhances CD8+ T cell-mediated protection from Listeria monocytogenes infection.

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Nanoparticle adjuvant sensing by TLR7 enhances CD8+ T cell-mediated protection from Listeria monocytogenes infection.

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