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Viral Nanoparticles for In vivo Tumor Imaging
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Surface-modified PLGA-based nanoparticles that can efficiently associate and deliver virus-like particles.

Patrizia Paolicelli1, Cecilia Prego, Alejandro Sanchez

  • 1Department of Pharmacy & Pharmaceutical Technology, School of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.

Nanomedicine (London, England)
|August 26, 2010
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New nanoparticles effectively encapsulate hepatitis B surface antigen for transmucosal delivery. This controlled release system preserves antigen activity and shows promise for vaccine development.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Vaccine Delivery

Background:

  • Hepatitis B virus (HBV) poses a significant global health challenge.
  • Effective vaccine delivery systems are crucial for controlling HBV transmission.
  • Virus-like particles (VLPs), such as hepatitis B surface antigen (HBsAg), are key components of HBV vaccines.

Purpose of the Study:

  • To engineer novel nanocarriers for encapsulating HBsAg (22 nm).
  • To develop a transmucosal delivery system for the HBsAg-loaded nanocarriers.
  • To create a stable and effective antigen delivery platform.

Main Methods:

  • Nanoparticles were fabricated using a blend of poly(D,L-lactide-co-glycolide) (PLGA) and poloxamer 188 core with a chitosan shell.
  • The nanoprecipitation technique was adapted for antigen association.
  • Antigen encapsulation efficiency, nanoparticle size, zeta potential, controlled release, and antigenicity were evaluated.

Main Results:

  • A significant 44% of active HBsAg was successfully associated with the nanocarriers.
  • The resulting nanoparticles measured approximately 200 nm with a positive zeta potential.
  • Controlled antigen release was observed for up to 14 days without compromising HBsAg activity.
  • HBsAg antigenicity was maintained for 14 days in suspension and 3 months when freeze-dried.

Conclusions:

  • PLGA-based nanoparticles provide a promising platform for VLP delivery.
  • The developed nanocarrier system demonstrates potential for effective transmucosal vaccine delivery.
  • This approach offers a stable and active antigen formulation for potential therapeutic applications.