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Highly versatile immunostimulating nanocapsules for specific immune potentiation.

Sara Vicente1, Mercedes Peleteiro, Jose V Gonzalez-Aramundiz

  • 1Center for Research in Molecular Medicine & Chronic Diseases (CIMUS), University of Santiago de Compostela, 15706 Campus Vida, Santiago de Compostela, Spain and Pharmacy & Pharmaceutical Technology Department, School of Pharmacy, University of Santiago de Compostela, 15705 Campus Vida, Santiago de Compostela, Spain and Current affiliation: Exploratory Unit, Sanofi-Aventis R&D, 31036 Toulouse, France.

Nanomedicine (London, England)
|March 29, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed novel squalene and polyglucosamine (PG) nanocapsules as a vaccine adjuvant system. These nanovaccines effectively delivered antigens and an immunostimulant, enhancing and prolonging immune responses in mice.

Keywords:
adjuvantsantigen deliverychitosanhepatitis Bnanocapsulessqualene

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Nanotechnology

Background:

  • Adjuvants are crucial for enhancing vaccine efficacy.
  • Novel delivery systems are needed for improved antigen and immunostimulant co-delivery.
  • Core-shell nanostructures offer potential for advanced vaccine formulations.

Purpose of the Study:

  • To create and characterize a novel core-shell nanocapsule adjuvant system using squalene and polyglucosamine (PG).
  • To evaluate the immunostimulant capacity and immune response modulation of the developed nanocapsules.
  • To assess the potential of this system for co-delivering antigens and immunostimulators.

Main Methods:

  • Synthesis of polyglucosamine (PG) nanocapsules with squalene core.
  • Characterization of nanocapsule size, zeta-potential, and surface properties.
  • Association efficiency of model antigens (Hepatitis B surface antigen, influenza hemagglutinin) and imiquimod.
  • In vivo evaluation of nanovaccine immunogenicity and immune response modulation in mice after intramuscular administration.

Main Results:

  • PG nanocapsules efficiently associated antigens (70-75%) and imiquimod.
  • Nanovaccines exhibited particle sizes of 200-250 nm and a positive zeta-potential (∼+60 mV).
  • Intramuscular administration in mice significantly potentiated and modulated the immune response to antigens, attributed to enhanced cell internalization, intracellular delivery, and prolonged site residence.

Conclusions:

  • The developed nanocapsules serve as an effective adjuvant system for subunit antigens.
  • This platform demonstrates capacity to enhance, prolong, and modulate immune responses.
  • The nanocapsule system is a promising platform for the co-delivery of diverse antigens and immunostimulators.