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Characterization of Gene Therapy Associated Uveitis Following Intravitreal Adeno-Associated Virus Injection in Mice

Authors
  • Tummala, Gayathri1
  • Crain, Adam1
  • Rowlan, Jessica1
  • Pepple, Kathryn L.1
  • 1 University of Washington, Department of Ophthalmology, Seattle, Washington, United States
Type
Published Article
Journal
Investigative Opthalmology & Visual Science
Publisher
Association for Research in Vision and Ophthalmology (ARVO)
Publication Date
Feb 25, 2021
Volume
62
Issue
2
Identifiers
DOI: 10.1167/iovs.62.2.41
PMID: 33630023
PMCID: PMC7910624
Source
PubMed Central
Keywords
Disciplines
  • Immunology and Microbiology
License
Unknown

Abstract

Purpose To characterize the intraocular immune cell infiltrate induced by intravitreal adeno-associated virus (AAV) gene therapy. Methods AAV vectors carrying plasmids expressing green fluorescent protein under the control of PR2.1 were injected intravitreally into AAV naive and AAV primed C57Bl/6 mice. Clinical inflammation was assessed using optical coherence tomography. Intraocular immune cell populations were identified and quantified by flow cytometry on days 1, 7, and 29 after intravitreal injection and compared with sham and fellow eye controls. Results Optical coherence tomography inflammation score and total CD45+ cell number were significantly higher in AAV injected eyes compared to uninjected fellow eye and sham injected controls. Clinically apparent inflammation (vitritis on optical coherence tomography) and cellular inflammation (CD45+ cell number) was significantly increased in AAV injected eyes and peaked around day 7. Vitritis resolved by day 29, but cellular inflammation persisted through day 29. On day 1, neutrophils and activated monocytes were the dominant cell populations in all AAV injected eyes. On day 7, eyes of AAV exposed animals had significantly more dendritic cells and T cells than eyes of AAV naive animals. By day 29, CD8– T cells were the dominant CD45+ cell population in AAV injected eyes. Conclusions Intravitreal AAV injection in mice generates clinically evident inflammation that is mild and seems to resolve spontaneously. However, the total number of intraocular CD45+ cells, particularly T cells, remain elevated. Both innate and adaptive immune cells respond to intravitreal AAV regardless of prior immune status, but the adaptive response is delayed in AAV naive eyes.

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