AAV‐mediated photoreceptor ZFP gene transfer reduces the severity of adRP retinal dystrophy. AAV‐mediated photoreceptor ZFP gene transfer reduces the severity.

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AAV‐mediated photoreceptor ZFP gene transfer reduces the severity of adRP retinal dystrophy. AAV‐mediated photoreceptor ZFP gene transfer reduces the severity of adRP retinal dystrophy. A. Representative Western blot with an anti‐HA antibody of the lysates from P347S retinae (P18) injected with AAV2/8‐RHOK‐ZF‐R6 at P4. Lane 1: HEK293 cells transfected with a plasmid encoding for ZF‐R6; lane 2: P347S retinal extracts transduced with AAV2/1‐CMV‐EGFP and AAV2/8‐RHOK‐EGFP; lane 3: P347S retinal extracts transduced with AAV2/8‐RHOK‐ZF‐R6 and AAV2/1‐CMV‐EGFP. Actin expression was used for normalization (anti‐actin antibody). B. Histogram from quantitative RT‐PCR analysis on P18 retinae transduced at P4 with AAV2/8‐RHOK‐ZF‐R6 and AAV2/1‐CMV‐EGFP. Specific down‐regulation, by 26%, of human rhodopsin transgene expression was measured in the treated eyes (white bars) compared to the control‐injected eyes (black bars). Photoreceptor specific gene expression levels (murine rhodopsin, peripherin, PDE6β and Cnga) remained unaltered in treated and control retinae (values normalized versus endogenous GAPDH transcript levels). **p < 0.05, as statistically significance difference between ZF‐R6 and EGFP treated eyes of the same animals (t‐test). C. Electrophysiological responses of retina recorded by ERG analysis, on P347S+/− mice injected subretinally with AAV2/8‐RHOK‐ZF‐R6 and AAV2/1‐CMV‐EGFP or AAV2/1‐CMV‐EGFP and AAV2/8‐RHOK‐EGFP at P30. The amplitudes represent retinal responses evoked by increasing light intensities under scotopic (dim light) and photopic (bright light) conditions. B‐wave amplitudes before treatment (base‐line: P30; open triangles, n = 34 eyes, 17 animals) and after treatment (P90; filled circles, n = 16 eyes, AAV2/8‐RHOK‐ZF‐R6 treated animals; open circles, n = 15 eyes, AAV2/8‐RHOK‐EGFP treated animals). Sixty days after vector delivery, the electrophysiologic responses of the retina were preserved in ZF‐R6‐treated eyes (black circles) compared to control contralateral EGFP injected eyes (open circles). *p < 0.01; **p < 0.001, as statistically significance differences between EGFP control eyes (P90) and base‐line responses (P30). D. Representative indirect ophthalmoscopy of retinal fundus. Fluorescent EGFP expression indicates the extension of retinal exposure after AAV vector administration (P90 P347S retina co‐injected with AAV2/8‐RHOK‐ZF‐R6 and AAV2/8‐RHOK‐EGFP). E. Representative immunofluorescence histological analysis of AAV2/8‐RHOK‐ZF‐R6 treated retina showing the EGFP‐positive retinal portion transduced (right; dotted square, selected field at higher magnification, 20×; co‐injection of AAV2/8‐RHOK‐ZF‐R6 and AAV2/8‐RHOK‐EGFP). This treatment resulted in partial preservation of photoreceptor cell nuclei, as compared to EGFP‐negative area (left; dotted square as before). Claudio Mussolino et al. EMBO Mol Med. 2011;3:118-128 © as stated in the article, figure or figure legend