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• W2891523172 abstract "Abstract Commercially available saponins are extracted from Quillaja saponaria barks, being Quil A ® the most widely used. Nanoparticulate immunostimulating complexes (ISCOMs or ISCOMATRIX) formulated with these, are able to stimulate strong humoral and cellular immune responses. Recently, we formulated novel ISCOMs replacing QuilA ® by QB-90 (IQB-90), a Quillaja brasiliensis leaf-extracted saponin fraction, and reported that IQB-90 improved antigen uptake, and induced systemic and mucosal antibody production, and T-cell responses. However, its mechanism of action remains unclear. In this study we provide a deeper insight into the immune stimulatory properties of QB-90 and ISCOMATRIX-like based on this fraction (IMXQB-90). We show herein that, when used as a viral vaccine adjuvant, QB-90 promotes an “immunocompetent environment”. In addition, QB-90 and IMXQB-90 induce immune-cells recruitment at draining-lymph nodes and spleen. Subsequently, we prove that QB-90 or IMXQB-90 stimulated dendritic cells secret IL-1β by mechanisms involving Caspase-1/11 and MyD88 pathways, implying canonical inflammasome activation. Finally, both formulations induce a change in the expression of cytokines and chemokines coding genes, many of which are up-regulated. Findings reported here provide important insights into the molecular and cellular mechanisms underlying the adjuvant activity of Q . brasiliensis leaf-saponins and its respective nanoparticles." @default.
• W2891523172 created "2018-09-27" @default.
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• W2891523172 date "2018-09-11" @default.
• W2891523172 modified "2023-10-16" @default.
• W2891523172 title "Quillaja brasiliensis saponin-based nanoparticulate adjuvants are capable of triggering early immune responses" @default.
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• W2891523172 doi "https://doi.org/10.1038/s41598-018-31995-1" @default.
• W2891523172 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6134118" @default.
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