Has GnRH a direct role in AMH regulation?

Area of Science:

• Endocrinology
• Reproductive Biology
• Human Physiology

Background:

• Anti-Mullerian hormone (AMH), luteinizing hormone (LH), and follicle-stimulating hormone (FSH) are key regulators of gonadal function.
• The influence of gonadotropin-releasing hormone (GnRH) on AMH levels via the hypothalamic-pituitary-gonadal (HPG) axis is not well understood.

Purpose of the Study:

• To investigate the impact of GnRH stimulation on serum AMH levels in healthy individuals.
• To explore the relationship between AMH, FSH, and LH following GnRH administration.

Main Methods:

• A cohort of 31 prepubertal children and 78 adults (both sexes) were enrolled.
• Serum samples were collected at baseline and at 30-minute intervals for 120 minutes post-intravenous GnRH stimulation (2.5 μg/kg, max 100 μg/kg).
• Hormone levels (AMH, FSH, LH) were quantified using electrochemiluminometric assays.

Main Results:

• A significant decrease in AMH levels was observed within 30 minutes of GnRH injection across all participant groups (P < 0.001).
• This AMH reduction occurred concurrently with a parallel increase in FSH and LH levels.
• Hormone levels showed a reversal trend in the subsequent 30 minutes, and a moderate negative correlation was found between AMH and FSH (r = -0.430, P < 0.001).

Conclusions:

• GnRH administration effectively lowers serum AMH levels, demonstrating an inverse relationship with rising gonadotropins (FSH and LH).
• These findings establish GnRH as a significant regulator of AMH.
• This research opens new avenues for understanding AMH's role in reproductive health and dysfunction.