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[Ultrastructural characteristics of glaucomatous trabecular meshwork]
1Departamento de Anatomía Humana, Facultad de Medicina, Universidad de Barcelona, Barcelona, España. jpotau@med.ub.es
Archivos De La Sociedad Espanola De Oftalmologia
|January 11, 2001
Summary
Glaucoma damages the trabecular meshwork similarly to accelerated aging. These ultrastructural changes in the trabecular meshwork contribute to increased intraocular pressure in primary open-angle glaucoma.
Area of Science:
- Ophthalmology
- Cell Biology
- Pathology
Background:
- The trabecular meshwork (TM) is crucial for regulating intraocular pressure (IOP).
- Primary open-angle glaucoma (POAG) is characterized by elevated IOP due to impaired aqueous humor outflow.
- Understanding TM ultrastructure is key to elucidating POAG pathogenesis.
Purpose of the Study:
- To compare the ultrastructure of normal and glaucomatous trabecular meshwork.
- To correlate observed TM ultrastructural changes with the increased IOP in POAG.
Main Methods:
- Transmission electron microscopy (TEM) was used for ultrastructural analysis.
- Qualitative comparison of TM morphology in 21 normal aged individuals and 5 POAG patients.
- Samples were fixed using Karnovsky's solution.
Main Results:
- Glaucomatous TM exhibited more intense ultrastructural changes than aged normal TM.
- Observed changes included loss of endothelial cells and thickened basal membranes.
- Trabecular beam central nucleus alterations included increased electrodense plaques and collagen degeneration.
Conclusions:
- Glaucomatous TM changes resemble accelerated aging.
- These ultrastructural alterations are implicated in the IOP elevation mechanism of POAG.