Direct comparison of administration routes for AAV8-mediated ocular gene therapy.

Abstract:

PURPOSE:We recently demonstrated that direct subretinal (SR) injection of adeno-associated virus (AAV) type 8 (AAV8) into photoreceptor cells and retinal pigment epithelium (RPE) is a highly efficient model of gene delivery. The current study compared transduction efficiency and expression patterns associated with various routes of vector administration. METHOD:The efficacy of intravitreal (VT), SR and subconjunctival (SC) injections for delivery of AAV8-derived vectors, i.e. those expressing luciferase (Luc) and enhanced green fluorescent protein (GFP) - AAV8/Luc and AAV8/GFP, respectively - were compared in an animal (mouse) model (n = 8 mice/group). Transduction efficiency and expression patterns were examined at post-injection weeks 1 and 2, and months 1, 3, 6 and 12 via in vivo imaging. RESULTS:One year after AAV injection, AAV8/Luc-treated mice exhibited stable and sustained high expression of vector in the VT and SR groups, but not in the SC group (VT:SR:SC = 3,218:2,923:115; 1 × 10(5 )photons/s). Histological analysis showed that GFP expression was observed in the inner retina of VT group mice, and in photoreceptor cells and RPE of SR group mice, whereas no GFP expression was noted in the SC group. Electroretinography (ERG) revealed adverse effects following SR delivery. CONCLUSIONS:Results suggest that both SR and VT injections of AAV8 vectors are useful routes for administering ocular gene therapy, and stress the importance of selecting an appropriate administration route, i.e. one that targets specific cells, for treating ocular disorders.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Igarashi T,Miyake K,Asakawa N,Miyake N,Shimada T,Takahashi H

doi

10.3109/02713683.2013.779720

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

569-77

issue

5

eissn

0271-3683

issn

1460-2202

journal_volume

38

pub_type

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