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Staining of rabbit eosinophil and pseudoeosinophil leukocytes
Abstract:
Air-dried rabbit blood was stained by HE, PAS and a modification of the Undritz II method. Eosin stained granules red in the eosinophil leukocytes. PAS was negative and the modified Undritz method failed to give consistent results. Cells with eosinophilic granules appeared in the corneal stroma 1 h after removing the corneal epithelium. They were stained red consistently by both eosin and the modified Undritz II method. Electron micrographs failed to demonstrate crystalloids in the granules. Because of the staining characteristics and the lack of crystalloids in their granules these cells were classified as pseudoeosinophil leukocytes. The electron micrographs showed some glycogen 12 h after denuding the cornea, however, glycogen was not well stained by PAS until 18 h after denuding.
Insights
Researchers identified pseudoeosinophil leukocytes in rabbit corneas after injury. These cells, distinct from typical eosinophils, appeared rapidly and stained with eosin, aiding in understanding corneal healing and immune responses.
Area of Science:
- Ophthalmology
- Immunology
- Cell Biology
Background:
- Eosinophils are key immune cells involved in inflammation and tissue repair.
- Understanding the cellular response in corneal injury is crucial for developing effective treatments.
Purpose of the Study:
- To characterize the cellular infiltrate in rabbit corneas following epithelial debridement.
- To identify and classify leukocytes with eosinophilic granules in the corneal stroma.
Main Methods:
- Rabbit corneas underwent epithelial abrasion.
- Tissue samples were stained using Hematoxylin-Eosin (HE), Periodic Acid-Schiff (PAS), and a modified Undritz II method.
- Electron microscopy was employed to examine cellular ultrastructure.
Main Results:
- Cells with eosinophilic granules appeared in the corneal stroma within 1 hour of epithelial removal.
- These cells stained red with eosin and a modified Undritz II method but lacked crystalloids, differentiating them from typical eosinophils.
- Glycogen was observed in corneal cells 12 hours post-injury, with optimal PAS staining at 18 hours.
Conclusions:
- The observed cells were classified as pseudoeosinophil leukocytes based on their staining properties and lack of crystalloids.
- Pseudoeosinophil leukocytes rapidly infiltrate injured corneal stroma.
- Glycogen presence suggests metabolic changes during corneal wound healing.