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Fibronectin in developing rabbit cornea.

C Cintron, L S Fujikawa, H Covington

    Current Eye Research
    |March 1, 1984
    PubMed
    Summary
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    Fibronectin is crucial for developing rabbit corneas, appearing in the stroma and aiding cell adhesion during tissue formation. Its presence highlights fibronectin's vital role in corneal morphogenesis.

    Area of Science:

    • Developmental Biology
    • Ophthalmology
    • Cell Biology

    Background:

    • Fibronectin is a key extracellular matrix protein implicated in tissue morphogenesis.
    • Understanding fibronectin's distribution is essential for comprehending corneal development.

    Purpose of the Study:

    • To investigate the distribution of fibronectin in the developing rabbit cornea using immunohistofluorescence.
    • To correlate fibronectin presence with specific developmental stages and corneal structures.

    Main Methods:

    • Immunohistofluorescence staining of cryostat sections of rabbit corneas at various developmental stages (fetal and neonatal).
    • Incubation with fluoresceinated anti-rabbit fibronectin antiserum (aFN) to detect fibronectin localization.
    • Microscopic examination to analyze fibronectin distribution patterns.

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    Main Results:

    • Fibronectin was detected in the presumptive stromal region and along epithelial basal surfaces during early development.
    • Distinct fibronectin fluorescence was observed in the corneal extracellular matrix, subepithelial zone, and lens capsule at 15 days of gestation.
    • Intense fibronectin fluorescence localized to the inner corneal stromal border during Descemet's membrane formation.
    • Stromal fibronectin appeared as fine lines within collagen lamellae, persisting through birth and diminishing in adults.
    • Descemet's membrane showed persistent, though reduced, fibronectin fluorescence in adult corneas.

    Conclusions:

    • Fibronectin is present throughout rabbit corneal development, from early fetal stages to adulthood.
    • The observed distribution suggests fibronectin plays a significant role in cell adhesion and extracellular matrix interactions necessary for corneal morphogenesis.
    • Fibronectin's dynamic localization indicates its involvement in specific developmental events, including stromal development and Descemet's membrane formation.