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• W3109722011 abstract "To date there is no clinically approved adjuvant to drive a protective T-helper cell 17 (Th17) immune response against Mycobacterium tuberculosis (Mtb). Trehalose Dimycolate (TDM) is a glycolipid molecule found in the cell wall of Mtb and similar species. Our team has discovered novel synthetic TDM derivatives that target Mincle receptors and when presented on the surface of amine functionalized silica nanoparticles (A-SNPs) adopt the requisite supramolecular structure for Mincle receptor agonism. Here we describe the preparation and characterization methods for these critical silica nanoparticles (SNPs) co-loaded with Mincle agonists (MAs) and a model antigen. In this work, A-SNPs with a particle diameter of 246 ± 11 nm were prepared and examined for co-adsorption of two synthetic MAs along with ovalbumin (OVA). Due to the insolubility of the studied MAs in aqueous environment, aggregation of the MAs made separation of the adjuvant-loaded A-SNPs from the free-form MAs via centrifugation very challenging. To facilitate separation, we synthesized modified SNPs with comparable amine surface functionalization to the original A-SNPs, but with a superparamagnetic iron oxide core (M-A-SNPs), to allow for magnetic separation. We also substituted Alexa Fluor 488-labeled ovalbumin (AF 488 OVA) for the un-tagged OVA to improve the sensitivity of our quantitation method. A RP-HPLC method was developed to simultaneously determine the amount of adsorption of both the Mincle adjuvant and the model antigen to the A-SNPs. AF488 OVA demonstrated higher than 90% adsorption, with or without the co-adsorption of MAs. Likewise, MAs exhibited higher than 80% adsorption in the presence or absence of antigen. The developed formulations were tested in vitro using murine RAW cells and human peripheral blood mononuclear cells, exhibiting good cytokine induction in both cell lines. Results from these studies indicate that A-SNPs could be used as a customizable presentation platform to co-deliver antigens along with different MAs of varying structural features and biophysical properties." @default.
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• W3109722011 date "2021-01-01" @default.
• W3109722011 modified "2023-09-27" @default.
• W3109722011 title "Co-adsorption of synthetic Mincle agonists and antigen to silica nanoparticles for enhanced vaccine activity: A formulation approach to co-delivery" @default.
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• W3109722011 doi "https://doi.org/10.1016/j.ijpharm.2020.120119" @default.
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