Apoptosis and proliferation in human undescended testes

Area of Science:

• Pediatric Endocrinology
• Reproductive Biology
• Cell Biology

Background:

• Undescended testes (cryptorchidism) are associated with reduced germ cell numbers and potential fertility issues.
• The role of apoptosis (programmed cell death) in the pathogenesis of undescended testes is debated.
• Previous studies suggest apoptosis may contribute to germ cell loss in cryptorchidism.

Purpose of the Study:

• To investigate the rates of apoptosis and cell proliferation in the testes of children with undescended testes.
• To determine if the location (inguinal vs. abdominal) or age of the child influences these cellular processes.
• To compare cellular apoptosis and proliferation in undescended testes with autopsy controls.

Main Methods:

• Testis biopsies were obtained during orchidopexy in children with undescended testes.
• Immunohistological techniques were employed to identify and quantify apoptotic and proliferating cells.
• Cell counts were standardized per 50 seminiferous tubules for comparison.

Main Results:

• Inguinal testes exhibited significantly less apoptosis than abdominal testes (P < 0.02).
• Children younger than 1 year had higher rates of apoptosis compared to older children (P < 0.03).
• Cell proliferation was minimal in all cryptorchid testes, while autopsy controls showed significantly higher apoptosis and proliferation.

Conclusions:

• Apoptosis and proliferation are not prevalent in human undescended testes from six months of age onwards.
• Increased apoptosis in abdominal testes and in infants under one year suggests this process may be more significant earlier in development.
• The findings contrast with animal studies and suggest that significant apoptosis in human cryptorchid testes likely occurs before six months of age.