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Updated: Jul 4, 2025
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A Model of Glaucoma Induced by Circumlimbal Suture in Rats and Mice
Published on: October 5, 2018
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Biologically Driven In Vivo Occlusion Design Provides a Reliable Experimental Glaucoma Model
Biorxiv : the Preprint Server for Biology
|February 8, 2024
Summary
Researchers developed novel injectable "viscobeads" to create a stable ocular hypertension model for studying glaucoma. This new method reliably elevates intraocular pressure (IOP) and causes retinal ganglion cell loss, aiding glaucoma research.
Area of Science:
- Ophthalmology and Vision Science
- Biomaterials Engineering
- Neuroscience
Background:
- Trabecular meshwork (TM) fluid flow regulates intraocular pressure (IOP).
- Current microbead models for ocular hypertension lack long-term IOP stability.
- Developing reliable glaucoma models is crucial for therapeutic evaluation.
Approach:
- Developed injectable "viscobeads" with a polystyrene core and polylactic-co-glycolic acid (PLGA) surface.
- Viscobeads mimic TM architecture to obstruct aqueous humor drainage.
- Administered via single injection to induce sustained IOP elevation in mice.
Key Points:
- Viscobeads achieved sustained IOP elevation (≥8 weeks) in mice.
- Induced significant retinal ganglion cell (RGC) loss (34%) and showed glaucoma progression via electroretinography (ERG).
- CRISPR screening identified genes (PTEN, ATF3, CHOP, LIN28) affecting RGC survival in this model.
Conclusions:
- Viscobeads provide a reliable, long-term model for studying ocular hypertension and glaucoma.
- This model facilitates investigation of glaucoma-like neurodegeneration.
- Enables evaluation of genetic and pharmacological interventions for glaucoma.
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