Related Experiment Videos
Changes in aqueous humor dynamics with age and glaucoma
B'Ann True Gabelt1, Paul L Kaufman
1Department of Ophthalmology and Visual Sciences, University of Wisconsin, F4/340 CSC, 600 Highland Avenue, Madison, WI 53792-3220, USA.
Progress in Retinal and Eye Research
|May 28, 2005
Summary
Aqueous humor dynamics change with age and glaucoma, reducing outflow facility and increasing intraocular pressure. Understanding these changes may lead to new glaucoma therapies.
Area of Science:
- Ophthalmology
- Cell Biology
- Biochemistry
Background:
- Aqueous humor dynamics are crucial for maintaining intraocular pressure (IOP).
- Age-related and glaucoma-induced changes in outflow pathways have been observed for decades.
- Previous studies indicated decreased trabecular outflow with aging and glaucoma.
Purpose of the Study:
- To investigate age-related and glaucoma-associated alterations in aqueous humor outflow.
- To identify molecular and cellular changes contributing to reduced outflow facility.
- To explore the role of extracellular matrix and specific molecular factors in IOP regulation.
Main Methods:
- Morphological studies of trabecular meshwork and ciliary muscle in aging and glaucoma eyes.
- Analysis of extracellular matrix composition, including hyaluronic acid, fibronectin, and thrombospondin.
- Investigation of cellular changes, such as trabecular meshwork cell loss and transformation.
- Examination of molecular signaling pathways involving growth factors and cytokines.
Main Results:
- Confirmed decreased outflow facility with age and glaucoma, and additionally found decreased uveoscleral outflow.
- Observed increased extracellular material accumulation and loss of trabecular meshwork cells.
- Identified reduced hyaluronic acid and increased fibronectin and thrombospondin in the extracellular environment.
- Linked age-related stresses to molecular signaling that promotes extracellular matrix accumulation and reduced outflow.
Conclusions:
- Age and glaucoma lead to significant changes in aqueous humor dynamics, including reduced trabecular and uveoscleral outflow.
- Accumulation of extracellular material and cellular alterations in the trabecular meshwork are key contributors to elevated intraocular pressure.
- Understanding the molecular pathways involved may reveal novel therapeutic targets for managing age-related and glaucoma-related ocular hypertension.