ArticleJournal of visualized experiments : JoVE2025
Ocular Therapeutic Delivery and Advanced Tissue Retrieval in Adult Rats.
Article in Journal of visualized experiments : JoVE, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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9 authors.
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Abstract
Therapeutic delivery to the posterior segment of the eye, including the retina and optic nerve, is complicated by the presence of blood-brain and blood-retinal barriers. Small animal models, such as rats, are utilized for studying various ocular pathologies. While therapeutic delivery to the posterior eye is challenging, achieving it is essential for treating ocular disorders, many of which require validation in small animal models for translational relevance. Therefore, two posterior therapeutic delivery techniques are presented: intravitreal injection (IVI) and retrobulbar injection (RBI) for use in adult rats. Additionally, a method for the en bloc removal of the eyes and optic nerves is introduced for various histological and molecular analysis techniques. The dissection protocol enables full observation of the neuro-visual system while minimizing post-mortem injury to retinal and optic nerve tissues. Successful delivery of the therapeutic cyclosporine to the retina and optic nerve was achieved, with detectable concentrations observed twenty-four hours after injection using both IVI and RBI. Furthermore, en bloc retina and nerve samples were successfully extracted for full eye histological tissue analysis, facilitating comprehensive observation of the retina and the wider neuro-visual system.
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