Impaired estrogen production by Leydig cells of the naturally retained testis in unilaterally cryptorchid boars and stallions.

This research focuses on the comparison of estrogen production in the Leydig cell of cryptorchid (undescended testes) and non-cryptorchid boars and stallions. The study found results indicating that undescended testes had impaired estrogen production when compared to the regular, descended testes.

Research Material and Methodology

• The research utilized boars and stallions with naturally occurring and experimentally induced cryptorchidism.
• Leydig cells, which are crucial for testosterone production, were isolated from the testes of mature animals. This was achieved through collagenase treatment and Percoll density gradients, methods common in cell separation processes.
• Cells were then incubated for 3 hours and the hormones present in the media – estrone sulfate, estrone, androstenedione, and testosterone – were measured using a direct radioimmunoassay, a test that measures the concentration of specific hormones.

Results and Conclusions

• The results showed that the Leydig cells from the undescended testis of unilaterally cryptorchid boars and stallions had impaired estrogen production compared to the Leydig cells from the regular, descended testis.
• The study also performed a surgical translocation wherein the scrotal testis was moved to the abdominal cavity in unilaterally cryptorchid boars. This experiment showed that the translocation did not reduce the ability of the Leydig cells to secrete estrogen after puberty.
• The retained testes in these four animals hardly produced any estrogen. However, in a stallion with bilateral cryptorchidism (both testes undescended), both testes had a high rate of estrogen secretion.
• The conclusion drawn from this research was that the descended testis in a unilaterally cryptorchid animal suppresses estrogen formation in the undescended testis. This potentially points towards the influence of environmental factors (such as temperature) on hormonal production.