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  • Larssen, P, et al. (författare)
  • Allogenicity Boosts Extracellular Vesicle-Induced Antigen-Specific Immunity and Mediates Tumor Protection and Long-Term Memory In Vivo
  • 2019
  • Ingår i: Journal of immunology (Baltimore, Md. : 1950). - : The American Association of Immunologists. - 1550-6606 .- 0022-1767. ; 203:4, s. 825-834
  • Tidskriftsartikel (refereegranskat)abstract
    • Extracellular vesicles (EV) are candidates for cancer immunotherapy because of their capacity to stimulate tumor-specific activity in vivo. However, clinical trials using peptide-loaded autologous EVs have so far only showed moderate T cell responses, suggesting a need for optimization of EV-induced immunity in humans. We previously demonstrated that induction of Ag-specific CD8+ T cells and antitumor responses to whole Ag were independent of MHC class I on EVs and hypothesized that multiple injections of allogeneic EVs could potentiate Ag-specific responses. In this study, we show that the allogeneic EV from mouse bone marrow–derived dendritic cells enhances Ag-specific CD8+ T cell, follicular helper T cell, and Ag-specific Ab responses. EV-injected mice demonstrated Ag-specific memory after 4 mo, with the highest Ab avidity in mice receiving double allogeneic EV injections. Reduced B16mOVA melanoma tumor growth was shown in all EV-injected groups. Our findings support the application of allogeneic EVs for therapeutic use in clinical studies in which an adaptive immune response is desired.
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