Immunohistochemical characteristics of normal canine eyes

Area of Science:

• Veterinary Pathology
• Ocular Immunology
• Canine Histology

Background:

• Immunohistochemistry (IHC) is vital for diagnosing canine neoplastic and nonneoplastic diseases.
• Understanding normal canine ocular tissue immunoreactivity is essential for accurate pathological interpretation.
• Existing IHC data for normal canine eyes is limited, hindering diagnostic accuracy.

Purpose of the Study:

• To establish a comprehensive immunohistochemical atlas of normal canine ocular tissues.
• To characterize the expression patterns of key diagnostic markers in healthy canine eyes.
• To provide a reference for interpreting IHC results in canine ocular pathology.

Main Methods:

• Immunohistochemistry was performed on four normal canine globes.
• A broad panel of diagnostically relevant antibodies was employed, including markers for vimentin, cytokeratins, muscle proteins, melanocytic markers, neural markers, and endothelial markers.
• Antibody staining patterns were systematically analyzed across different ocular structures.

Main Results:

• Cytokeratin expression was observed in the conjunctival, corneal, and retinal pigment epithelia.
• Distinct immunopositivity patterns were noted for muscle markers (α-smooth muscle actin, muscle-specific actin, desmin).
• Widespread immunoreactivity was found for vimentin and most neural/neuroendocrine markers (e.g., GFAP, neurofilaments, NSE, chromogranin A, synaptophysin).

Conclusions:

• This study provides a foundational dataset for canine ocular immunohistochemistry.
• The characterized normal tissue expression profiles aid in the differential diagnosis of canine ocular diseases.
• The findings serve as a critical reference for veterinary pathologists evaluating canine ocular tumors and other conditions.