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Ocular surface complex carbohydrates are modified with aging.

L D Hazlett, M M Moon

    Experimental Eye Research
    |January 1, 1987
    PubMed
    Summary
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    This study used advanced staining techniques to analyze ocular surface mucus in mice of all ages. Findings reveal age-related changes in mucus composition, particularly involving sialic acid and sulfation, crucial for eye surface defense.

    Area of Science:

    • Ophthalmology
    • Biochemistry
    • Histology

    Background:

    • Ocular surface mucus plays a vital role in eye protection.
    • Understanding the chemical composition and development of ocular mucus is essential for eye health.

    Purpose of the Study:

    • To chemically stabilize and characterize ocular surface-associated mucus in mice across different age groups.
    • To investigate age-related changes in mucus composition, focusing on anionic groups like carboxyl and sulfate.
    • To determine the role of sialic acid in ocular surface mucus.

    Main Methods:

    • Chemical fixation using picric acid-paraformaldehyde-glutaraldehyde (PA-P-G).
    • Transmission electron microscopy (TEM) with specific stains: cationic ferritin (CF), dialysed iron, Alcian Blue, high iron diamine (HID), and periodic acid-thiocarbohydrazide-silver protein (PA-T-SP).

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  • Enzymatic treatment with neuraminidase to assess sialic acid presence.

    • Main Results:

    • All tested ages showed positive labeling for anionic groups, indicating mucus presence even when not morphologically visible.
    • Staining intensity for carboxyl and sulfate groups increased with age, with sulfation becoming more apparent in older mice.
    • Neuraminidase treatment reduced cationic ferritin binding, confirming the presence of sialic acid, which was less prevalent in very young mice.

    Conclusions:

    • Ocular surface mucus composition undergoes significant development-associated changes.
    • Sialic acid and sulfation are key components of ocular mucus, varying with age.
    • These findings contribute to understanding ocular surface defense mechanisms and age-related alterations.