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Pituitary LH and FSH and testosterone secretion in infants with undescended testes
Insights
Infants with undescended testes show reduced luteinizing hormone (LH) response to gonadotropin-releasing hormone (GnRH). This suggests an early pituitary-Leydig cell axis defect in cryptorchidism.
Area of Science:
- Pediatric Endocrinology
- Reproductive Medicine
- Developmental Biology
Background:
- Undescended testes (cryptorchidism) affect male infant reproductive health.
- The pituitary-gonadal axis development is crucial for testicular function.
- Early detection of hormonal imbalances is vital for timely intervention.
Purpose of the Study:
- To investigate the pituitary-Leydig cell axis function in male infants with undescended testes.
- To assess hormonal responses to stimulation tests in early cryptorchidism.
Main Methods:
- Studied twelve male infants (1 week to 11 months) with undescended testes.
- Administered Luteinizing Hormone-Releasing Hormone (LH-RH) and Human Chorionic Gonadotropin (HCG) stimulation tests.
- Measured plasma levels of gonadotropins (LH, FSH) and testosterone.
Main Results:
- Infants showed a significantly decreased LH response to LH-RH, similar to older cryptorchid boys.
- Basal gonadotropin levels and FSH response to LH-RH were normal.
- Plasma testosterone levels were normal, with Leydig cells responding to HCG stimulation.
- The LH peak after LH-RH correlated positively with the HCG-induced testosterone response.
Conclusions:
- An early defect in the pituitary-Leydig cell axis is associated with undescended testes in male infants.
- This hormonal dysfunction may contribute to the development of cryptorchidism.
- Findings highlight the importance of evaluating the pituitary-gonadal axis in infants with undescended testes.
Abstract:
Twelve male infants with undescended testes (5 bilaterally, 7 unilaterally) were studied between the ages of 1 week and 11 months. As in older pre-pubertal cryptorchid boys, a significant decrease of the LH response to LH-RH test was found, while basal plasma levels of gonadotrophins and FSH response to LH-RH were normal. Plasma testosterone levels were in the normal range, and Leydig cells responded to stimulation by HCG, the degree of this response being significantly and positively correlated to the LH peak elicited by LH-RH. It may be concluded that some early defect of the pituitary-Leydig cell axis is associated with undescended testis.