Abstract:
:The present study describes biochemical and morphological differences of pseudophakic bullous keratopathy (PBK) corneas as compared with normal corneas. At the ultrastructural level, all PBK corneas studied had abnormal fibrillar material posterior to the Descemet's membrane. In addition, two of the six PBK buttons had subepithelial fibrocellular materials disrupting the epithelial basement membrane and Bowman's layer. Aggregates of collagen fibrils with 110 nm periodicity were occasionally seen within the stroma of the PBK corneas. Isolation and purification of the collagen from the Descemet's membrane/posterior collagenous layer (DM/PCL) showed an increased amount of material with molecular weight in the range of 50-60K daltons (presumably type VIII collagen) and decreased amounts of higher molecular weight, disulfide-bonded collagenous materials (presumably type IV collagen) as compared with normals. Sugar-specific lectin studies showed an increased deposition of peanut agglutinin (PNA) and Ricinus communis agglutinin I (RCA120) in the DM/PCL of the PBK corneas. Our data suggest that the DM/PCL of PBK corneas have an increased accumulation of terminal B-galactose and B-D-galactose (1-3)-D-N-acetylgalactosamine residues and altered ratios of low and high molecular weight collagenous proteins.
journal_name
Corneajournal_title
Corneaauthors
Kenney MC,Chwa Msubject
Has Abstractpub_date
1990-04-01 00:00:00pages
115-21issue
2eissn
0277-3740issn
1536-4798journal_volume
9pub_type
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