Cited by 59Virus-based gene therapy researchRetinal Development and DisordersRNA Interference and Gene Delivery

Subretinal delivery of adeno-associated virus serotype 2 results in minimal immune responses that allow repeat vector administration in immunocompetent mice

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Barker, Susie E., Broderick, Cathryn A., Robbie, Scott J., Duran, Yanai, Natkunarajah, Mythili, Buch, Prateek, Balaggan, Kamaljit S., MacLaren, Robert E. +3 more·2009·The Journal of Gene Medicine

Abstract

Background: Adeno‐associated virus serotype 2 (AAV2) vectors show considerable promise for ocular gene transfer. However, one potential barrier to efficacious long‐term therapy is the development of immune responses against the vector or transgene product. Methods: We evaluated cellular and humoural responses in mice following both single and repeated subretinal administration of AAV2, and examined their effects on RPE65 and green fluorescent protein transgene expression. Results: Following subretinal administration of vector, splenocytes and T‐cells from draining lymph nodes showed minimal activation following stimulation by co‐culture with AAV2. Neutralizing antibodies (NAbs) were not detected in the ocular fluids of any mice receiving AAV2 or in the serum of mice receiving a lower dose. NAbs were present in the serum of a proportion of mice receiving a higher dose of the vector. Furthermore, no differences in immunoglobulin titre in serum or ocular fluids against RPE65 protein or AAV2 capsid between treated and control mice were detected. Histological examination showed no evidence of retinal toxicity or leukocyte infiltration compared to uninjected eyes. Repeat administration of low‐dose AAV.hRPE65.hRPE65 to both eyes of RPE65−/− mice resulted in transgene expression and functional rescue, but re‐administration of high‐dose AAV2 resulted in boosted NAb titres and variable transgene expression in the second injected eye. Conclusions: These data, which were obtained in mice, suggest that, following subretinal injection, immune responses to AAV2 are dose‐dependent. Low‐dose AAV2 is well tolerated in the eye, with minimal immune responses, and transgene expression after repeat administration of vector is achievable. Higher doses lead to the expression of NAbs that reduce the efficacy of repeated vector administration. Copyright © 2009 John Wiley & Sons, Ltd.

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Authors
Barker, S. E., Broderick, C. A., Robbie, S. J., Duran, Y., Natkunarajah, M., Buch, P., Balaggan, K. S., MacLaren, R. E., Bainbridge, J. W. B., Smith, A. J., & Ali, R. R.
Affiliations
University College London (GB)
Corresponding author
Barker, Susie E.
Venue
The Journal of Gene Medicine
Publisher
Wiley
Published
2009-04
Volume
11
Issue
6
Pages
486-497
ISSN
  • 1099-498X (ISSN-L)
  • 1521-2254
OpenAlex
W2017708248
Cited by
59
References
49
Citations by year
2025: 2 · 2023: 5 · 2022: 3 · 2021: 4 · 2020: 2 · 2019: 4 · 2018: 3 · 2017: 4 · 2016: 4 · 2015: 3 · 2014: 2 · 2013: 3 · 2012: 7
FWCI
3.70
Type
journal article
Language
en
Open access
Locations
  • The Journal of Gene Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • NIHR Biomedical Research Centre, Royal Marsden NHS Foundation Trust/Institute of Cancer Research
  • National Institute for Health and Care Research (NF-SI-0508-10130)
  • Moorfields Eye Hospital NHS Foundation Trust
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
AAV2, subretinal gene therapy, neutralizing antibodies, RPE65, retinal degeneration, immunocompetent mice, retinal toxicity
MeSH terms
Retinoid Isomerohydrolase, Dependovirus, Animals, Carrier Proteins, Cell Line, Electroretinography, Eye, Eye Proteins, Female, Genetic Vectors, Immunocompetence, Injections, Mice, Inbred C57BL, Mice, Transgenic, Neutralization Tests, Genetic Therapy, cis-trans-Isomerases, Mice

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