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Hydrogen peroxide and corneal endothelium
Acta Ophthalmologica
|June 1, 1981
Summary
Hydrogen peroxide (H2O2) shows corneal endothelial toxicity above 0.3 mM, causing swelling and cell damage. Catalase effectively blocks these toxic effects, offering a potential protective mechanism against H2O2-induced ocular damage.
Area of Science:
- Ophthalmology
- Toxicology
- Cell Biology
Background:
- Recent evidence indicates low levels of hydrogen peroxide in aqueous humor.
- Understanding corneal endothelial toxicity is crucial for ocular health.
Purpose of the Study:
- To determine the corneal endothelial toxicity levels of hydrogen peroxide (H2O2).
- To identify factors that modify H2O2-induced corneal toxicity.
Main Methods:
- Corneal endothelial cells were perfused with varying concentrations of H2O2.
- Toxicity was assessed by measuring corneal swelling and cell damage.
- The effects of catalase, EDTA-Fe+3, ascorbic acid, glutathione, and adenosine were evaluated.
Main Results:
- A toxicity threshold for H2O2 was identified between 0.3 and 0.5 mM.
- 0.5 mM H2O2 caused rapid corneal swelling and endothelial cell damage.
- Catalase (5400 U/ml) blocked both physiological and anatomical toxic effects of 0.5 mM H2O2.
- EDTA-Fe+3 enhanced H2O2-induced corneal swelling.
- Ascorbic acid, glutathione, and adenosine did not affect H2O2 toxicity.
Conclusions:
- Hydrogen peroxide exhibits dose-dependent toxicity to corneal endothelium.
- Catalase is a potent inhibitor of H2O2-induced corneal endothelial damage.
- Factors like chelated iron can exacerbate H2O2 toxicity, while others have no significant impact.