Uptake of particulate vaccine adjuvants by dendritic cells activates the NALP3 inflammasome.

Proceedings of the National Academy of Sciences of the United States of America
Fiona A SharpEd C Lavelle

Abstract

Many currently used and candidate vaccine adjuvants are particulate in nature, but their mechanism of action is not well understood. Here, we show that particulate adjuvants, including biodegradable poly(lactide-co-glycolide) (PLG) and polystyrene microparticles, dramatically enhance secretion of interleukin-1beta (IL-1beta) by dendritic cells (DCs). The ability of particulates to promote IL-1beta secretion and caspase 1 activation required particle uptake by DCs and NALP3. Uptake of microparticles induced lysosomal damage, whereas particle-mediated enhancement of IL-1beta secretion required phagosomal acidification and the lysosomal cysteine protease cathepsin B, suggesting a role for lysosomal damage in inflammasome activation. Although the presence of a Toll-like receptor (TLR) agonist was required to induce IL-1beta production in vitro, injection of the adjuvants in the absence of TLR agonists induced IL-1beta production at the injection site, indicating that endogenous factors can synergize with particulates to promote inflammasome activation. The enhancement of antigen-specific antibody production by PLG microparticles was independent of NALP3. However, the ability of PLG microparticles to promote antigen-specific IL-6 pr...Continue Reading

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