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Encapsulated Cell Technology for the Delivery of Biologics to the Mouse Eye
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Microencapsulation: the future of oral immunotherapy?

A Litwin1, M Flanagan, J G Michael

  • 1Department of Molecular Genetics, College of Medicine, University of Cincinatti, Cincinatti, Ohio 45267, USA.

Biodrugs : Clinical Immunotherapeutics, Biopharmaceuticals and Gene Therapy
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PubMed
Summary

Encapsulating allergens protects them from digestion, enabling effective oral immunotherapy. This novel approach stimulates immune responses and reduces allergy symptoms without systemic reactions.

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Area of Science:

  • Allergy and Immunology
  • Drug Delivery Systems

Background:

  • Subcutaneous immunotherapy (SCIT) is established for atopic diseases but causes systemic allergic reactions.
  • Oral immunotherapy (OIT) has shown limited efficacy due to allergen degradation and low potency.
  • Existing OIT requires high doses, often proving ineffective and poorly tolerated.

Purpose of the Study:

  • To develop and evaluate a novel allergen encapsulation system for improved oral immunotherapy.
  • To assess the safety and efficacy of encapsulated allergens in preclinical and clinical models.

Main Methods:

  • Development of an encapsulation technique protecting allergens from gastric acid and pepsin.
  • Administration of encapsulated allergens orally to mice to assess immune responses.
  • Clinical trials involving encapsulated short ragweed pollen extracts (eSRW) in allergic humans.

Main Results:

  • Encapsulated allergens induced robust systemic immune responses in mice, favoring CD4+ T helper type 2 lymphocytes.
  • Human trials showed eSRW induced high IgG, suppressed IgE and IgA responses, and reduced nasal sensitivity.
  • Significant symptom reduction was observed in patients tolerating eSRW, without systemic reactions.

Conclusions:

  • Allergen encapsulation is a promising strategy to overcome OIT limitations.
  • Encapsulated allergens demonstrate potential for safe and effective immunotherapy against allergic diseases.
  • This novel system may offer a viable alternative to SCIT with improved safety profiles.