Abstract
Sex-determining region Y box9 gene (SOX9) protein plays a pivotal role in male sexual development. It regulates the transcription of the anti-Müllerian hormone gene promoting development of testis cords, multiplication, and maturation of Sertoli cells (SCs) and maintenance of spermatogenesis in adult testis. The immunohistochemical expression of SOX9 in normal testes has been reported in humans, mice, and rats. The present study aimed to investigate the expression of SOX9 in canine SCs during testicular maturation and neoplastic transformation. Canine testicular samples derived from three fetuses, four newborns, four prepubertal puppies, five adult dogs, 31 Sertoli cell tumors (SCTs) (one metastasizing), and five Leydig cell tumors (LCTs) were selected from departmental archive and tested immunohistochemically with a polyclonal antibody against SOX9 (1:150). All SCs from fetal, neonatal, and adult testes had a strong and exclusively nuclear labeling for SOX9. In SCs from prepubertal testes, SOX9 staining was highly variable with one negative sample (one of four), two samples with exclusively nuclear staining (two of four), and one with both nuclear and cytoplasmic labeling (one of four). Leydig cells (LCs) and LCTs were always ...Continue Reading
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