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Protein oxidation and lens opacity in humans
F Boscia1, I Grattagliano, G Vendemiale
1Department of Ophthalmology, University of Bari, Italy. francescoboscia@hotmail.com
Investigative Ophthalmology & Visual Science
|August 11, 2000
Summary
Oxidative damage to lens proteins, indicated by protein carbonyls and sulfhydryl (P-SH) levels, is key in cataract formation. Specific thresholds for these markers predict cataract presence and progression, especially in diabetic and myopic patients.
Area of Science:
- Ophthalmology
- Biochemistry
- Oxidative Stress Research
Background:
- Oxidative damage to lens proteins is a primary driver of cataract formation.
- Identifying critical oxidation thresholds is crucial for understanding cataract pathogenesis.
Purpose of the Study:
- To determine the threshold of protein oxidation associated with lens opacification.
- To investigate the role of oxidative damage in senile, diabetic, and myopic cataracts.
Main Methods:
- Studied 62 cataractous lenses and 72 clear control lenses.
- Assessed protein carbonyl and sulfhydryl (P-SH) content using spectrophotometry.
- Age- and sex-matched control lenses from enucleation or vitrectomy patients.
Main Results:
- Found an age-associated inverse relationship between P-SH and protein carbonyls.
- Oxidative damage was more pronounced in cataracts, particularly diabetic and myopic types.
- Lens opacification correlated with protein carbonyls > 2 nmol/mg and P-SH < 10-12 nmol/mg.
Conclusions:
- Cataractogenesis in senile, diabetic, and myopic individuals is linked to oxidative lens protein damage.
- Oxidative damage appears earlier in diabetic and myopic cataracts.
- Oxidation thresholds for protein carbonyls and P-SH are predictive of cataract presence.