Tissue Eng Regen Med.  2020 Feb;17(1):33-44. 10.1007/s13770-019-00228-5.

Enhanced Efficacy of Immunization with a Foot-and-Mouth Disease Multi-Epitope Subunit Vaccine Using Mannan-Decorated Inulin Microparticles

• Yoon SY
• Kang SK
• Lee HB
• Oh SH
• Kim WS
• Li HS
• Bok JD
• Cho CS
• Choi YJ

• KMID: 2509252
• DOI: http://doi.org/10.1007/s13770-019-00228-5

Abstract

BACKGROUND
Despite the many advantages of recombinant subunit vaccines, they have critical weaknesses that include a low efficacy for promoting cellular and humoral immune responses against antigens because of their poor immunogenicity, and a rapidly cleared properties as a result of proteolytic enzymes in the body. To circumvent these problems, we developed mannan-decorated inulin acetate microparticles (M-IA MPs) that functioned as carriers and adjuvants for immunization with the recombinant foot-and-mouth disease multi-epitope subunit vaccine (M5BT).
METHODS
The M5BT-loaded M-IA MPs were obtained by a double-emulsion solvent-evaporation method. Their properties including morphology, size and release ability were determined by field emission scanning electron microscope, dynamic light-scattering spectrophotometer and spectrophotometer. To assess the immunization efficacy of the MPs, mice were immunized with MPs and their sera were analyzed by ELISA.
RESULTS
The M-IA MPs obtained by a double-emulsion solvent-evaporation method were spherical and approximately 2–3 µm, and M5BT was encapsulated in the M-IA MPs. The M5BT-loaded M-IA MPs showed higher antigen-specific IgG, IgG1, IgG2a and anti-FMDV antibodies than the M5BT-loaded IA MPs and the Freund’s adjuvant as a control.
CONCLUSION
The M-IA MPs showed a powerful and multifunctional polymeric system that combined two toll-like receptor agonists compared to the conventional adjuvant.

Keyword

Inulin acetate; Microparticle; Mannan; Food-and-mouth disease; Subunit vaccine