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Alpha 2-macroglobulin levels in normal human and keratoconus corneas
S Sawaguchi1, S S Twining, B Y Yue
1Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago College of Medicine.
Investigative Ophthalmology & Visual Science
|November 1, 1994
Summary
Keratoconus corneas show significantly lower levels of alpha 2-macroglobulin, a key proteinase inhibitor. This finding suggests abnormal degradation processes may contribute to keratoconus development.
Area of Science:
- Ophthalmology
- Biochemistry
- Proteinase Inhibition
Background:
- Alpha 2-macroglobulin is a major proteinase inhibitor found in human corneas.
- Understanding proteinase inhibitor levels is crucial for corneal disease research.
Purpose of the Study:
- To quantify alpha 2-macroglobulin levels in keratoconus corneas.
- To compare these levels with normal human corneas and those with other diseases.
Main Methods:
- Immunoperoxidase staining for alpha 2-macroglobulin visualization.
- Western blot and dot blot assays for quantitative analysis.
- Analysis of corneal tissues including epithelium, stroma, and endothelium.
Main Results:
- Alpha 2-macroglobulin was present in all corneal layers.
- Keratoconus corneas exhibited markedly reduced epithelial staining intensity.
- Lower alpha 2-macroglobulin levels were detected in epithelial and stromal extracts of keratoconus corneas compared to controls.
Conclusions:
- Keratoconus corneas have reduced levels of alpha 2-macroglobulin.
- This supports the hypothesis of aberrant degradation processes in keratoconus.
- Further research into proteinase inhibitor roles in corneal pathology is warranted.