Related Experiment Videos
Ocular vascular and epithelial barriers to microperoxidase
Investigative Ophthalmology
|July 1, 1975
Summary
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.