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Related Experiment Videos

Pseudoexfoliative material and oxytalan fibers.

B W Streeten, A J Dark, C W Barnes

    Experimental Eye Research
    |May 1, 1984
    PubMed
    Summary

    Pseudoexfoliative material (PSX) shares staining similarities with ocular zonular fibers, suggesting common components. However, PSX exhibits distinct histochemical differences, indicating a unique composition and origin.

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    Area of Science:

    • Ophthalmology
    • Biochemistry
    • Histology

    Background:

    • Pseudoexfoliative material (PSX) is an abnormal deposit found in the eye.
    • Ocular zonular fibers are crucial for lens support.
    • Oxytalan staining is a histochemical technique used to identify certain fibrous proteins.

    Purpose of the Study:

    • To compare the histochemical properties of pseudoexfoliative material (PSX) with ocular zonular fibers.
    • To investigate the composition of PSX and its relationship to other ocular structures.

    Main Methods:

    • Histochemical staining techniques were employed to analyze PSX and zonular fibers.
    • Comparative analysis of staining reactions, including oxytalan, disulfide, sulhydryl, acidic mucosubstance, and PAS-positive glycoprotein.

    Main Results:

    • PSX exhibited similar oxytalan staining to ocular zonular fibers, indicating shared components.
    • Both PSX and zonular fibers reacted positively for disulfide, sulhydryl groups, and acidic mucosubstances.
    • The deep striated zone of the pre-equatorial lens capsule and lens capsular inclusions showed similar reactions to PSX.
    • Histochemical differences were noted: PSX contained less PAS-positive glycoprotein and more acidic mucosubstance than the zonule.
    • Variations in PSX staining suggested it is a composite material.

    Conclusions:

    • Pseudoexfoliative material (PSX) shares some histochemical characteristics with ocular zonular fibers and lens capsule components.
    • PSX appears to be derived from local basement membrane-secreting cells.
    • PSX represents an abnormal polymerization of glycoconjugates, similar to elastic microfibrils.

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