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Studies on the selective retinal degeneration induced by sodium iodate (NaIO3) date back to 1941; Sorsby (1941) described the effect of intravenously injected NaIO3 solution on the rabbit retina. Since then, NaIO3-induced retinal degeneration has been described in different mammalian species including sheep, rabbit, rat and mouse with varying doses and routes of administration. At the present time, the murine NaIO3 model is the most widely used because it results in reproducible, patchy retinal degeneration (Figure 1) and can be studied in a wide variety of wild type and genetic knockout strains. Many studies reporting the pathologic changes in retinal structure at specific time points and electrophysiological changes in retinal function over time have followed (Franco et al., 2009; Redfern et al., 2011). More recently, the model has gained a resurgence of interest because of the ability to utilize high resolution in vivo imaging to study structural changes in the retina in live animals. Techniques such as spectral domain optical coherence tomography (OCT) and confocal scanning laser ophthalmoscopy (cSLO) allow longitudinal evaluation of retinal structure (Machalinska et al., 2014; Yang et al., 2014); thus making this model amenable to evaluation of novel therapeutic approaches to retinal degeneration such as cellular therapies.

Sodium iodate induced retinal degeneration: new insights from an old model