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Correlation of pituitary and testicular responses to stimulation tests in cryptorchid children
Insights
Cryptorchidism, or undescended testes, may stem from delayed pituitary luteinizing hormone (LH) secretion. This study found lower LH levels and response in cryptorchid boys, impacting testosterone production.
Area of Science:
- Pediatric Endocrinology
- Reproductive Endocrinology
- Andrology
Background:
- Cryptorchidism is a common congenital condition in male infants.
- The hormonal regulation of testicular descent is not fully understood.
- Luteinizing hormone (LH) plays a crucial role in testicular development and function.
Purpose of the Study:
- To investigate the role of pituitary gonadotropin secretion in cryptorchidism.
- To assess the function of Leydig cells in response to human chorionic gonadotropin (HCG) stimulation in cryptorchid boys.
- To explore the correlation between LH secretion and testicular maldescent.
Main Methods:
- Hormone assays including LH-RH and HCG stimulation tests were performed.
- 154 boys aged 1 month to 15 years with cryptorchidism were studied.
- Basal and stimulated plasma levels of LH, FSH, and testosterone were measured.
Main Results:
- Boys with cryptorchidism showed significantly lower basal LH levels and LH response to LH-RH from infancy to early puberty compared to controls.
- FSH levels and response to LH-RH were normal in cryptorchid boys.
- Testosterone response to HCG stimulation was reduced until mid-puberty.
Conclusions:
- The findings suggest a potential early defect or delay in pituitary LH secretion contributes to testicular maldescent.
- Reduced Leydig cell responsiveness to HCG in cryptorchidism may be linked to impaired LH secretion.
- This highlights the importance of evaluating pituitary-gonadal axis function in cryptorchidism.
Abstract:
LH-RH test and HCG stimulation test were performed in 154 cryptorchid boys aged 1 month to 15 years (64 unilateral and 90 bilateral). Basal plasma LH levels and LH response to LH-RH were significantly lower from infancy to early puberty in cryptorchids compared with controls. Basal FSH levels and FSH response to LH-RH were normal. The post-HCG rise of plasma testosterone was reduced until mid-puberty. A significant positive correlation was found between post-HCG testosterone levels and pre- and post-LH-RH levels of LH. This correlation suggests that testicular maldescent and the decreased ability of Leydig cells to respond to a short course of HCG may result from an early defect or a delay of pituitary LH secretion.