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Surface Functionalization of Hepatitis E Virus Nanoparticles Using Chemical Conjugation Methods
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Chitosan-based nanoparticles for improving immunization against hepatitis B infection.

Cecilia Prego1, Patrizia Paolicelli, Belen Díaz

  • 1Nanobiofar Group, Department of Pharmacy and Pharmaceutical Technology, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.

Vaccine
|January 26, 2010
PubMed
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Chitosan nanoparticles effectively deliver hepatitis B antigens, showing stability and enhanced immune response. This polysaccharide nanocarrier shows promise as an adjuvant for subunit vaccine delivery.

Area of Science:

  • Biomaterials Science
  • Vaccinology
  • Nanotechnology

Background:

  • Developing equitable, safe, and efficient vaccine delivery is crucial for global health.
  • Virus-like particle (VLP) antigens require effective delivery systems to enhance immunogenicity.

Purpose of the Study:

  • To create and evaluate polysaccharidic nanoparticles for delivering virus-like particle antigens.
  • To use recombinant hepatitis B surface antigen (rHBsAg) as a model antigen for vaccine delivery system development.

Main Methods:

  • Polysaccharidic nanoparticles were synthesized using chitosan (CS) and ionic gelation.
  • Nanoparticle characterization included size, surface charge, antigen association efficiency, and epitope integrity (ELISA, Western blot).
  • In vitro antigen release, storage stability, and in vivo immunization studies were conducted.

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Main Results:

  • Chitosan nanoparticles (160-200 nm, +6 to +10 mV) efficiently associated rHBsAg (>60%) while preserving antigenicity.
  • Sustained antigen release was observed in vitro, with nanoparticles demonstrating stability under various storage conditions.
  • Intramuscular immunization induced significant seroprotection, with anti-HBsAg IgG levels 9-fold higher than alum-adjuvanted vaccines.

Conclusions:

  • Chitosan-based nanoparticles serve as a promising nanocarrier for subunit vaccine delivery.
  • These nanoparticles exhibit favorable in vitro and in vivo characteristics, including adjuvant capacity and antigen protection.
  • The developed polysaccharidic nanocarrier offers a potential strategy for more equitable and efficient immunization programs.