Reis-Bücklers' corneal dystrophy. Immunofluorescent and electron microscopic studies

Area of Science:

• Ophthalmology
• Corneal Diseases
• Cell Biology

Background:

• Reis-Bücklers' corneal dystrophy (RBCD) is a rare genetic eye disorder.
• The precise location of primary pathology in RBCD has been debated, with the anterior stroma, epithelium, and Bowman's layer as potential sites.
• Understanding the cellular and molecular basis of RBCD is crucial for developing targeted therapies.

Observation:

• Immunofluorescence and ultrastructural analysis were used to examine corneal tissue from RBCD patients.
• Characteristic "peculiar curly" filaments were observed in the subepithelial fibrous tissue.
• Areas of early disease showed deposition of this material between a distorted epithelial basal lamina and Bowman's layer.

Findings:

• Laminin and bullous pemphigoid antigen (BPA), normally localized to the epithelial basal lamina in healthy corneas, exhibited a patchy, mosaic distribution in RBCD.
• This aberrant distribution of attachment proteins was found within the abnormal subepithelial fibrous tissue.
• The distribution of the "peculiar curly" material closely mirrored that of laminin and BPA.

Implications:

• The findings strongly suggest that Reis-Bücklers' corneal dystrophy is primarily an epithelial disease.
• The "peculiar curly" material appears to be related to abnormal deposition or alteration of epithelial attachment proteins.
• This research provides critical insights into the pathogenesis of RBCD, potentially guiding future diagnostic and therapeutic strategies.