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Antioxidant enzymes in the human iris: an immunogold study
1Tennent Institute of Ophthalmology, University of Glasgow, Western Infirmary.
The British Journal of Ophthalmology
|April 1, 1997
Summary
The human iris contains antioxidant enzymes like Cu/Zn superoxide dismutase (SOD) and acidic glutathione S-transferase (GST). These enzymes, particularly acidic GST, may play a role in protecting the iris from oxidative stress and xenobiotics.
Area of Science:
- Ocular biology
- Biochemistry
- Cellular physiology
Background:
- The human iris possesses an antioxidant enzyme system crucial for maintaining ocular health.
- Understanding the distribution of these enzymes is vital for comprehending iris physiology and potential disease mechanisms.
Observation:
- Immunogold labeling revealed the precise localization of five key antioxidant enzymes within human iris tissue.
- Cu/Zn superoxide dismutase (SOD) and acidic glutathione S-transferase (GST) were found in all iris cells.
Findings:
- Glutathione peroxidase and basic GST were exclusively identified in erythrocytes.
- Neutral GST showed no detectable labeling in the iris tissue.
- Acidic GST exhibited dense labeling, suggesting a significant role.
Implications:
- The high concentration of acidic GST in the iris may be linked to the presence of polyunsaturated fatty acids.
- This enzyme activity could also be associated with the detoxification of xenobiotic substances in the aqueous humor.
- Further research into the iris antioxidant system can inform strategies for managing ocular conditions.