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- W3097918725 abstract "Although the existing flu vaccines elicit strong antigen-specific antibody responses, they fail to provide effective, long term protection - partly due to the absence of robust cellular memory immunity. We hypothesized that co-administration of combination adjuvants, mirroring the flu-virus related innate signaling pathways, could elicit strong cellular immunity. Here, we show that the small molecule adjuvant R848 and the RNA adjuvant PUUC, targeting endosomal TLR7s and cytoplasmic RLRs respectively, when delivered together in polymer nanoparticles (NP), elicits a broadened immune responses in mouse bone marrow-derived dendritic cells (mBMDCs) and a synergistic response in both mouse and human plasmacytoid dendritic cells (pDCs). In mBMDCs, NP-R848-PUUC induced both NF-κB and interferon signaling. Interferon responses to co-delivered R848 and PUUC were additive in human peripheral blood mononuclear cells (PBMCs) and synergistic in human FLT3-differentiated mBMDCs and CAL-1 pDCs. Vaccination with NPs loaded with H1N1 Flu antigen, R848, and PUUC increased percentage of CD8+ T-cells in the lungs, percentage of antigen-specific CD4-T-cells in the spleen, and enhanced overall cytokine-secreting T cell percentages upon antigen restimulation. Also, in the spleen, T lymphopenia, especially after in vitro restimulation with dual adjuvants, was observed, indicating highly antigen-reactive T cells. Our results demonstrate that simultaneous engagement of TLR7 and RIG-I pathways using particulate carriers is a potential approach to improve cellular immunity in flu vaccination." @default.
- W3097918725 created "2020-11-09" @default.
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- W3097918725 date "2021-02-01" @default.
- W3097918725 modified "2023-09-28" @default.
- W3097918725 title "TLR7 and RIG-I dual-adjuvant loaded nanoparticles drive broadened and synergistic responses in dendritic cells in vitro and generate unique cellular immune responses in influenza vaccination" @default.
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- W3097918725 doi "https://doi.org/10.1016/j.jconrel.2020.10.060" @default.
- W3097918725 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7906919" @default.
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- W3097918725 hasPublicationYear "2021" @default.
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