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Issue 48, 2016
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Discovery of inulin acetate as a novel immune-active polymer and vaccine adjuvant: synthesis, material characterization, and biological evaluation as a toll-like receptor-4 agonist

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Abstract

Vaccine adjuvants are an essential part of modern vaccine design, especially against intracellular pathogens such as M. tuberculosis, malarial parasite, HIV, influenza virus and Ebola. The present work offers a unique approach to designing novel vaccine adjuvants by identifying polymers that mimic “pathogen associated molecular patterns” (PAMPS) and engineering an immune-active particulate vaccine delivery system that uses the polymer. By using this strategy, we report the discovery of the first plant polymer based toll-like receptor-4 (TLR-4) agonist, inulin acetate (InAc). InAc was synthesised from the plant polysaccharide inulin. Inulin acetate as a polymer and particles prepared using InAc were characterised using various physicochemical techniques. The TLR-4 agonistic activity of InAc was established in multiple immune, microglial, dendritic, peripheral blood mononuclear (human and swine) and genetically modified epithelial cells (HEK293) that exclusively express TLR-4 on their surface. InAc activated all the above-mentioned cells to release proliferative cytokines; however, InAc failed to activate when the were cells either pre-incubated with a TLR-4 specific antagonist or isolated from mice deficient in adapter proteins involved in TLR signalling (Mal/MyD88). Antigen encapsulated microparticles prepared with TLR-4 agonist InAc mimicked pathogens to offer improved antigen delivery to dendritic cells compared to soluble antigen (47 times) or antigen encapsulated poly(lactic-co-glycolic acid) (PLGA) particles (1.57 times). In conclusion, InAc represents a novel polymer-based modern vaccine adjuvant targeting specific signalling pathways of the innate immune system, which could be formulated into a platform vaccine delivery system against cancer and viral diseases.

Graphical abstract: Discovery of inulin acetate as a novel immune-active polymer and vaccine adjuvant: synthesis, material characterization, and biological evaluation as a toll-like receptor-4 agonist

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Publication details

The article was received on 25 Aug 2016, accepted on 07 Nov 2016 and first published on 07 Nov 2016


Article type: Paper
DOI: 10.1039/C6TB02181F
Citation: J. Mater. Chem. B, 2016,4, 7950-7960
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    Discovery of inulin acetate as a novel immune-active polymer and vaccine adjuvant: synthesis, material characterization, and biological evaluation as a toll-like receptor-4 agonist

    S. Kumar, S. S. Kesharwani, B. Kuppast, M. Rajput, M. Ali Bakkari and H. Tummala, J. Mater. Chem. B, 2016, 4, 7950
    DOI: 10.1039/C6TB02181F

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