Sox9 expression in canine epithelial skin tumors

Area of Science:

• Veterinary Dermatology
• Molecular Biology
• Oncology

Background:

• Sox9 is a key regulatory gene in development, stem cell maintenance, and tumorigenesis.
• Sox9 expression is observed in healthy skin and various canine skin neoplasms, often mimicking hair follicle development patterns.

Purpose of the Study:

• To investigate Sox9 expression in eleven types of canine skin neoplasms.
• To correlate tumor phenotype with molecular characteristics for improved diagnosis and management.
• To assess Sox9 as a potential stem cell marker in canine skin tumors.

Main Methods:

• Immunohistochemical staining of Sox9 in eleven distinct canine skin neoplasm types.
• Evaluation of Sox9 expression patterns and intensity.
• Correlation of Sox9 positivity with tumor phenotype and origin.

Main Results:

• All examined canine skin neoplasms, except keratoacanthoma, showed variable Sox9 positivity, particularly in basal layers.
• Neoplasms originating from the hair follicle bulge region, such as trichoblastoma, exhibited higher Sox9 intensity.
• Sox9 expression patterns suggest a role in the development of canine epidermal and follicular tumors.

Conclusions:

• Sox9 is a valuable marker in canine skin neoplasms, especially those of follicular origin.
• Sox9 can potentially serve as a stem cell marker to elucidate the role of stem cells in canine skin tumorigenesis.
• Understanding Sox9 expression aids in defining tumor development, diagnosis, and clinical management strategies.