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Characterization of stroma from Fuchs' endothelial dystrophy corneas
A Calandra1, M Chwa, M C Kenney
1Corneal Connective Tissue Laboratory, Cedars-Sinai Medical Center, Los Angeles, California 90048.
Cornea
|January 1, 1989
Summary
Fuchs' corneal dystrophy involves altered corneal collagen and glycoconjugate accumulation. This study reveals distinct biochemical changes in Fuchs' corneas compared to normal ones.
Area of Science:
- Ophthalmology
- Biochemistry
- Cell Biology
Background:
- Fuchs' endothelial dystrophy is traditionally viewed as an endothelial cell disorder.
- The extracellular matrix composition in Fuchs' dystrophy remains incompletely understood.
Purpose of the Study:
- To investigate and compare glycoconjugates and collagen in Fuchs' corneas versus normal corneas.
- To elucidate potential biochemical alterations contributing to Fuchs' dystrophy pathogenesis.
Main Methods:
- Comparative analysis of corneal glycoconjugates using FITC-conjugated lectins (PNA, RCA120, SBA, WGA).
- Biochemical characterization of corneal collagen, including extractability, amino acid analysis, and peptide mapping.
- Assessment of stromal and epithelial regions for differential staining patterns.
Main Results:
- Increased accumulation of terminal beta-galactose and specific B-D-galactose residues (detected by RCA120 and PNA) in the posterior Fuchs' corneas.
- Fuchs' corneas exhibited increased collagen extractability and abnormal amino acid profiles.
- Two-dimensional peptide mapping revealed distinct biochemical differences in collagen chains from Fuchs' corneas.
Conclusions:
- Fuchs' corneas display abnormal glycoconjugate accumulation and altered stromal collagen biochemical properties.
- Endothelial dysfunction in Fuchs' dystrophy may impact the corneal stroma and lead to matrix alterations.
- These findings suggest a more complex pathology involving the corneal extracellular matrix in Fuchs' dystrophy.