Design and Biological Assembly of Polyester Beads Displaying Pneumococcal Antigens as Particulate Vaccine
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Radecker, Anna-Maria
Rodriguez-Noda, Laura M
Farinas-Medina, Mildrey
Zayas-Vignier, Caridad
Hernandez-Cedeno, Mabel
Serrano, Yohana
Cardoso, Felix
Santana-Mederos, Darielys
Garcia-Rivera, Dagmar
Valdes-Balbin, Yury
Verez-Bencomo, Vicente
Rehm, Bernd HA
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Abstract
Streptococcus pneumoniae can cause life-threatening infections mostly in infants, children, and elderly people. Capsular polysaccharide conjugate vaccines provide serotype-dependent protection against S. pneumoniae infections but fail to protect against new emerging serotypes. To overcome these limitations, pneumolysin (Ply), a serotype-independent and conserved protein was selected. As such subunit vaccines lack immunogenicity, we engineered Ply to be attached to self-assembled polyester beads in order to boost immunogenicity. To display Ply at the surface of these polyester beads, it was translationally fused to the N-terminus of the polyhydroxybutyrate (PHB) synthase (PhaC), which mediates PHB bead assembly inside recombinant Escherichia coli. We also chemically conjugated the capsular polysaccharide (CPS) 19F to isolated PHB beads to further assess their antigen carrier properties. CPS conjugated to soluble tetanus toxoid served as control. Balb/c mice immunized with Ply-PhaC beads and 19F-PhaC beads induced specific and higher IgG levels than the respective soluble counterparts. The induced IgG antibodies recognized Ply in whole cell lysates of six different serotypes of S. pneumoniae. Additionally, restimulated splenocytes from animals immunized with Ply-PhaC beads produced a balanced INF-γ/IL-17A profile unlike animals immunized with soluble Ply. The 19F-PhaC beads induced production of antibodies showing high opsonophagocytic titers against the homologous strain, serotype 19F, while CPS 19F only mixed with PhaC beads did not elicit any detectable immune response. This study provided insight into the design of PHB beads as a carrier of proteinaceous antigens and CPS in order to induce immune responses for the prevention of pneumococcal infections.
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ACS Biomaterials Science and Engineering
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4
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9
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This document is the Postprint: Accepted Manuscript version of a Published Work that appeared in final form in ACS Biomaterials Science and Engineering, © 2018 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acsbiomaterials.8b00579
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Biomedical engineering
Biomedical engineering not elsewhere classified