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09:03
Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
Published on: June 20, 2015
[Ultrastructural changes of the trabecular meshwork in glucocorticoid induced glaucoma]
1Department of Ophthalmology,The First Affiliated Hospital of Liaoning Medical College，Jinzhou 121000，China.
Yan Ke Xue Bao = Eye Science
|December 28, 2010
Summary
This study successfully created a steroid-induced glaucoma model in rabbits, revealing ultrastructural changes in the trabecular meshwork. These findings offer insights into the mechanisms behind increased aqueous outflow resistance in steroid-induced glaucoma.
Area of Science:
- Ophthalmology
- Cell Biology
- Pharmacology
Background:
- Glaucoma is a leading cause of irreversible blindness worldwide.
- Steroid-induced ocular hypertension is a significant concern in clinical practice.
- Understanding the cellular mechanisms of steroid-induced glaucoma is crucial for developing effective treatments.
Purpose of the Study:
- To establish a rabbit model of steroid-induced glaucoma.
- To investigate the ultrastructural changes in the trabecular meshwork (TM) of the eye.
- To explore the mechanisms contributing to increased aqueous humor outflow resistance.
Main Methods:
- Forty New Zealand white rabbits were divided into control and three treatment groups.
- Steroid-induced glaucoma was induced using a combination of dexamethasone sodium phosphate solution and triamcinolone acetonide injections over 8 weeks.
- Intraocular pressure (IOP) was measured weekly using a Schiotz tonometer.
- Trabecular meshwork tissues were examined using Transmission Electron Microscopy (TEM).
Main Results:
- A successful rabbit model of steroid-induced glaucoma was established, with 80% of experimental eyes showing elevated IOP.
- Significant increases in IOP were observed in the drug combination group compared to the control group (p<0.05).
- TEM revealed abnormalities in TM cell nuclei, increased microfilaments and microtubules, cytoplasmic vacuolation, and endoplasmic reticulum expansion.
Conclusions:
- The combined drug regimen effectively established a glucocorticoid-induced ocular hypertension rabbit model.
- Observed ultrastructural changes in the trabecular meshwork cytoskeleton are integral to the mechanism of steroid-induced IOP elevation.
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