Encapsulation of recombinant adenovirus into alginate microspheres circumvents vector specific immune response

G. Sailaja, H. HogenEsch, A. North, J. Hays, S. K. Mittal

Research output: Contribution to journalReview article

81 Scopus citations


Pre-existing immunity against adenoviruses may compromise the efficacy of adenoviral vectors for vaccination and gene therapy. The purpose of this study was to determine whether encapsulation of adenovirus recombinants into biodegradable alginate microparticles could circumvent the vector-specific immune response. Mice were immunized either intranasally (i.n.) or intraperitoneally (i.p.) with human adenovirus type 5 (HAd5), resulting in the development of virus-specific antibodies. Immunized and naïve mice were inoculated with AdCA36lacZ (an E1-deleted HAd5 recombinant containing the bacterial β-galactosidase (LacZ) gene), encapsulated (E) into alginate microparticles, or nonencapsulated (NE) ie, as a virus suspension. LacZ expression in animals immunized once (1 x) or twice (2 x) with HAd5 and subsequently inoculated with NE-AdCA36lacZ (NE-Z) was significantly (P<0.001) reduced compared to those levels observed in NE-Z inoculated naïve mice, suggesting that the immune response against the vector adversely affected transgene expression. In contrast, there was only slight reduction (P > 0. 05) in LacZ expression in mice immunized 1 x or 2 x with HAd5 that were subsequently inoculated with E-AdCA36lacZ (E-Z) compared to those levels obtained in E-Z inoculated naïve animals. Similar results were obtained with i. n. or i.p. inoculated animals. These results indicate that microencapsulation of recombinant adenovirus effectively circumvented the vector-specific immune response.

Original languageEnglish (US)
Pages (from-to)1722-1729
Number of pages8
JournalGene Therapy
Issue number24
StatePublished - Dec 1 2002
Externally publishedYes


  • Adenovirus encapsulation
  • Adenovirus recombinant
  • Alginate microspheres
  • Delivery vehicle
  • Vector-specific immune response

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology
  • Genetics

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