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Analysis of corneal aldehyde dehydrogenase patterns in pathologic corneas
T D Gondhowiardjo1, N J van Haeringen, H J Völker-Dieben
1Department of Ophthalmology, University of Indonesia, Jakarta.
Cornea
|March 1, 1993
Summary
Keratoconus corneas show significantly lower epithelial aldehyde dehydrogenase (ALDH) activity compared to normal corneas. This enzymatic difference, linked to specific protein patterns, may offer insights into keratoconus pathogenesis.
Area of Science:
- Ophthalmology
- Biochemistry
- Corneal Disease Research
Background:
- Corneal aldehyde dehydrogenase (ALDH) plays a role in ocular health.
- Keratoconus is a progressive thinning of the cornea.
- Understanding enzymatic differences in keratoconus is crucial for disease insights.
Purpose of the Study:
- To investigate the properties and activity of corneal aldehyde dehydrogenase (ALDH) in keratoconus.
- To compare ALDH in keratoconus tissues with normal corneal controls.
Main Methods:
- Utilized electrophoretic techniques, immunochemical identification, and zymography.
- Analyzed corneal epithelial, stromal, and endothelial extracts from keratoconus and control samples.
- Assessed ALDH thermolability, molecular weight species, isoelectric focusing patterns, and native-PAGE banding.
Main Results:
- Significantly lower epithelial ALDH enzymatic activity in keratoconus (3.1 IU/mg) versus normal corneas (5.5 IU/mg).
- No significant differences in stromal or endothelial ALDH activity, thermolability, or major protein species (54/88 kDa).
- Distinct isoelectric focusing patterns and a shift from three to two bands on native-PAGE in keratoconus, reproducible with reducing agents.
Conclusions:
- Epithelial ALDH activity is significantly reduced in keratoconus corneas.
- Altered ALDH protein patterns, potentially influenced by reducing conditions, characterize keratoconus.
- These findings suggest a role for epithelial ALDH dysfunction in keratoconus pathophysiology.