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Collagen staining in corneal tissues.

B Y Yue, J Sugar, K Schrode

    Current Eye Research
    |August 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    A new Sirius red staining method quantifies corneal collagen in paraffin-embedded tissue. This reproducible technique showed no significant collagen differences in common corneal diseases but suggested potential alterations in macular and granular dystrophies.

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    Area of Science:

    • Ophthalmology
    • Biochemistry
    • Histology

    Background:

    • Accurate quantification of corneal collagen is essential for understanding corneal diseases.
    • Existing biochemical assays can be time-consuming and require fresh tissue.
    • A need exists for a rapid and reproducible method to assess collagen content in routinely processed corneal specimens.

    Purpose of the Study:

    • To adapt and validate a spectrophotometric method for quantifying collagen in paraffin-embedded corneal tissue sections.
    • To assess collagen content in various pathological corneal conditions using the adapted method.

    Main Methods:

    • Paraffin-embedded corneal tissue sections were deparaffinized and stained with Sirius red.
    • Bound dye was eluted using NaOH-methanol.

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  • Absorbance was measured spectrophotometrically to determine collagen content.

    • Main Results:

    • The Sirius red staining method proved simple, rapid, and reproducible, comparable to biochemical assays.
    • No significant differences in collagen staining were observed between normal controls and tissues from patients with aphakic bullous keratopathy, pseudophakic bullous keratopathy, Fuchs' dystrophy, or lattice corneal dystrophy.
    • Reduced Sirius red staining in macular and granular corneal dystrophies suggested potential collagen alterations, though biochemical assays did not support this finding.

    Conclusions:

    • The adapted Sirius red staining method is a viable technique for quantifying collagen in archival corneal tissue.
    • The method can be applied to study collagen in various corneal pathologies.
    • While initial staining suggested collagen changes in some dystrophies, further investigation is needed to confirm these findings biochemically.