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  • Viral-mediated RdCVF and RdCVFL expression protects cone and rod photoreceptors in retinal degeneration.

Viral-mediated RdCVF and RdCVFL expression protects cone and rod photoreceptors in retinal degeneration.

The Journal of clinical investigation (2014-11-22)
Leah C Byrne, Deniz Dalkara, Gabriel Luna, Steven K Fisher, Emmanuelle Clérin, Jose-Alain Sahel, Thierry Léveillard, John G Flannery
ABSTRACT

Alternative splicing of nucleoredoxin-like 1 (Nxnl1) results in 2 isoforms of the rod-derived cone viability factor. The truncated form (RdCVF) is a thioredoxin-like protein secreted by rods that promotes cone survival, while the full-length isoform (RdCVFL), which contains a thioredoxin fold, is involved in oxidative signaling and protection against hyperoxia. Here, we evaluated the effects of these different isoforms in 2 murine models of rod-cone dystrophy. We used adeno-associated virus (AAV) to express these isoforms in mice and found that both systemic and intravitreal injection of engineered AAV vectors resulted in RdCVF and RdCVFL expression in the eye. Systemic delivery of AAV92YF vectors in neonates resulted in earlier onset of RdCVF and RdCVFL expression compared with that observed with intraocular injection using the same vectors at P14. We also evaluated the efficacy of intravitreal injection using a recently developed photoreceptor-transducing AAV variant (7m8) at P14. Systemic administration of AAV92YF-RdCVF improved cone function and delayed cone loss, while AAV92YF-RdCVFL increased rhodopsin mRNA and reduced oxidative stress by-products. Intravitreal 7m8-RdCVF slowed the rate of cone cell death and increased the amplitude of the photopic electroretinogram. Together, these results indicate different functions for Nxnl1 isoforms in the retina and suggest that RdCVF gene therapy has potential for treating retinal degenerative disease.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
4,4′-二氨基二苯甲烷, ≥97.0% (GC)
Supelco
4,4′-二氨基二苯甲烷, analytical standard
碘克沙醇, European Pharmacopoeia (EP) Reference Standard