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Ocular vascular and epithelial barriers to microperoxidase

R S Smith, L A Rudt

    Investigative Ophthalmology
    |July 1, 1975
    PubMed

    Insights

    Microperoxidase (MP), a small tracer, was used to study ocular barriers. It did not cross barriers that horseradish peroxidase (HRP) could not, establishing a new lower permeability level.

    Area of Science:

    • Biochemistry
    • Ophthalmology
    • Neuroscience

    Background:

    • Microperoxidase (MP) is a low molecular weight tracer (1,900 Da) derived from horse heart cytochrome c.
    • MP can access the periaxonal space in the central nervous system, a pathway inaccessible to horseradish peroxidase (HRP).

    Purpose of the Study:

    • To investigate the permeability of ocular vascular and epithelial barriers using MP.
    • To determine if MP's unique properties could reveal finer details of ocular barrier function compared to HRP.

    Main Methods:

    • Utilized microperoxidase (MP) as an ultrastructural tracer.
    • Administered MP to probe ocular vascular and epithelial barrier systems.
    • Compared MP's distribution with known HRP exclusion patterns.

    Main Results:

    • MP did not penetrate any ocular spaces from which HRP was already known to be excluded.
    • The study demonstrated that MP's penetration profile mirrored that of HRP in ocular tissues.
    • MP confirmed the integrity of specific ocular barrier systems.

    Conclusions:

    • MP serves as a valuable tracer for evaluating ocular barrier permeability.
    • The findings establish a new, lower threshold for permeability assessment in ocular barrier systems.
    • MP's behavior in ocular barriers is consistent with its known properties in the central nervous system regarding barrier exclusion.

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