Immunostimulatory nucleic acid nanoparticles (NANPs) augment protective osteoblast and osteoclast type I interferon responses to Staphylococcus aureus.
Erin L MillsYelixza I AvilaDamian BeasockYasmine RadwanSamantha R SuptelaIan MarriottKirill A AfoninM Brittany JohnsonPublished in: Nanomedicine : nanotechnology, biology, and medicine (2024)
Recalcitrant staphylococcal osteomyelitis may be due, in part, to the ability of Staphylococcus aureus to invade bone cells. However, osteoclasts and osteoblasts are now recognized to shape host responses to bacterial infection and we have recently described their ability to produce IFN-β following S. aureus infection and limit intracellular bacterial survival/propagation. Here, we have investigated the ability of novel, rationally designed, nucleic acid nanoparticles (NANPs) to induce the production of immune mediators, including IFN-β, following introduction into bone cells. We demonstrate the successful delivery of representative NANPs into osteoblasts and osteoclasts via endosomal trafficking when complexed with lipid-based carriers. Their delivery was found to differentially induce immune responses according to their composition and architecture via discrete cytosolic pattern recognition receptors. Finally, the utility of this nanoparticle technology was supported by the demonstration that immunostimulatory NANPs augment IFN-β production by S. aureus infected bone cells and reduce intracellular bacterial burden.
Keyphrases
- staphylococcus aureus
- nucleic acid
- induced apoptosis
- immune response
- dendritic cells
- cell cycle arrest
- bone loss
- bone mineral density
- endoplasmic reticulum stress
- cell death
- signaling pathway
- bone regeneration
- soft tissue
- biofilm formation
- pseudomonas aeruginosa
- cell proliferation
- cross sectional
- toll like receptor
- body composition
- pi k akt
- reactive oxygen species
- free survival