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Time Course of Structural, Functional, Complement Changes and Inflammatory Processes in a Sodium Iodate Rat Model of
Shiying Zhao1,2, Florian Voegele1,2, Jiaqi Tang1,2
1Centre for Ophthalmology, University Medical Center, Eberhard Karls University, Tuebingen, Germany.
Summary
A new rat model using sodium iodate (NaIO3) effectively mimics geographic atrophy (GA), an advanced form of age-related macular degeneration (AMD). This model shows key pathological changes and functional deficits, aiding in developing new treatments for vision loss.
Area of Science:
- Ophthalmology
- Retinal Degeneration Research
- Animal Models of Disease
Background:
- Geographic atrophy (GA) is an advanced stage of age-related macular degeneration (AMD), leading to irreversible central vision loss.
- Current treatment development is hampered by the absence of reliable animal models that fully replicate GA's complex pathology.
- Understanding GA's structural, functional, and molecular aspects is crucial for therapeutic advancements.
Purpose of the Study:
- To establish and characterize a novel sodium iodate (NaIO3)-induced rat model for geographic atrophy (GA).
- To evaluate the model's capacity to recapitulate key pathological features of human GA.
- To assess the suitability of this model for preclinical testing of potential GA therapies.
Main Methods:
- Induction of bilateral retinal degeneration in Long Evans rats via intraperitoneal injection of sodium iodate (NaIO3) at 80 mg/kg.
- Comprehensive in vivo and histological analysis including SLO, OCT, ERG, light/electron microscopy, and immunohistochemistry at multiple time points post-injection.
- Assessment of morphological, functional, ultrastructural, molecular (complement activation, immune cell infiltration), and cellular changes.
Main Results:
- The NaIO3 model demonstrated hallmark GA features: choriocapillaris loss, RPE degeneration, photoreceptor death, and Bruch's membrane remodeling.
- Significant mitochondrial damage, complement pathway activation (C3, C5b-9), and immune cell infiltration (Iba1, CD68) were observed.
- Electroretinography (ERG) confirmed profound and persistent functional deficits, consistent with GA progression.
Conclusions:
- The sodium iodate (NaIO3)-induced rat model accurately replicates critical pathological events of geographic atrophy (GA).
- The model exhibits robust mimicry of GA hallmarks, particularly by 7 days post-injection.
- This validated rat model serves as a valuable platform for preclinical evaluation of therapeutic strategies targeting RPE and choriocapillaris protection in GA.
