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Related Experiment Videos

Biodegradable microparticles for oral immunization

D T O'Hagan1, J P McGee, J Holmgren

  • 1Department of Pharmaceutical Sciences, University of Nottingham, University Park, UK.

Vaccine
|January 1, 1993
PubMed
Summary

Poly(lactide-co-glycolide) microparticles effectively enhance immune responses. Oral administration of these microparticles significantly boosted salivary IgA and serum IgG antibody levels, demonstrating their potential as vaccine delivery systems.

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Nanotechnology

Background:

  • Poly(lactide-co-glycolide) (PLGA) microparticles are widely used for drug and vaccine delivery.
  • Understanding the immunomodulatory effects of PLGA microparticles is crucial for developing effective vaccines.

Purpose of the Study:

  • To evaluate the immunogenicity of ovalbumin (OVA) and cholera toxin B subunit (CTB) when encapsulated in PLGA microparticles.
  • To compare the immune responses induced by microparticle-based delivery versus soluble antigen administration.

Main Methods:

  • Ovalbumin (OVA) and cholera toxin B subunit (CTB) were encapsulated in PLGA microparticles.
  • Mice were immunized intraperitoneally or orally with microparticle-encapsulated antigens.
  • Proliferative and cytotoxic T-cell responses were assessed in spleen cells.

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  • Salivary IgA and serum IgG antibody levels were measured.
  • Antibody-secreting cells were detected in spleen and mesenteric lymph nodes.

    • Main Results:

    • Intraperitoneal immunization with OVA-loaded microparticles induced significant T-cell proliferation and cytotoxic T-cell responses.
    • Oral immunization with OVA-loaded microparticles resulted in significantly higher salivary IgA and serum IgG antibody responses compared to soluble OVA.
    • Oral immunization with CTB-loaded microparticles led to the detection of specific antibody-secreting cells in both spleen and mesenteric lymph nodes.

    Conclusions:

    • PLGA microparticles serve as an effective delivery system for enhancing both cellular and humoral immune responses.
    • Oral administration of microparticle-encapsulated antigens can induce robust mucosal and systemic immunity.
    • PLGA microparticles show promise as a platform for developing novel oral vaccines.