ABSTRACT
Neisseria meningitidis is a leading cause of bacterial meningitis and sepsis, and its capsular polysaccharides (CPS) are a major virulence factor in meningococcal infections and form the basis for serogroup designation and protective vaccines. We formulated a novel nanovaccine containing meningococcal CPS as an antigen encapsulated in albumin-based nanoparticles (NPs) that does not require chemical conjugation to a protein carrier. These nanoparticles are taken up by antigen-presenting cells and act as antigen depot by slowly releasing the antigen. In this study, we determined the ability of CPS-loaded vaccine nanoparticles to induce co-stimulatory molecules, namely CD80, CD86, and CD95 that impact effective antigen presentation. Co-stimulatory molecule gene induction and surface expression on macrophages and dendritic cells pulsed with meningococcal CPS-loaded nanoparticles were investigated using gene array and flow cytometry methods. Meningococcal CPS-loaded NP significantly induced the surface protein expression of CD80 and CD86, markers of dendritic cell maturation, in human THP-1 macrophages and in murine dendritic cells DC2.4 in a dose-dependent manner. The massive upregulation was also observed at the gene expression. However, high dose of CPS-loaded NP, but not empty NP, induced the expression of death receptor CD95 (Fas) leading to reduced TNF-α release and reduction in cell viability. The data suggest that high expression of CD95 may lead to death of antigen-presenting cells and consequently suboptimal immune responses to vaccine. The CPS-loaded NP induces the expression of co-stimulatory molecules and acts as antigen depot and can spare antigen dose, highly desirable criteria for vaccine formulations.
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ACKNOWLEDGMENTS
This work is supported in part by grants from Emory-Egleston Children’s Research Center and Center for Pediatric Nanomedicine of Emory + Children’s Pediatrics Research Center to S.M.Z. The authors are grateful to Dr. Seshu Gudlavelleti for providing meningococcal vaccine-grade serogroup A capsular polysaccharides.
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Guest Editor: Aliasger K. Salem
Ruhi V. Ubale and Rikhav P. Gala have equally contributed to this work.
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Ubale, R.V., Gala, R.P., Zughaier, S.M. et al. Induction of Death Receptor CD95 and Co-stimulatory Molecules CD80 and CD86 by Meningococcal Capsular Polysaccharide-Loaded Vaccine Nanoparticles. AAPS J 16, 986–993 (2014). https://doi.org/10.1208/s12248-014-9635-2
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DOI: https://doi.org/10.1208/s12248-014-9635-2