Hypothalamic-pituitary-gonadotropic function in girls with premature thelarche

Area of Science:

• Pediatric endocrinology
• Reproductive health
• Neuroendocrinology

Background:

• Premature thelarche is characterized by early breast development.
• Distinguishing it from true precocious puberty is crucial for appropriate management.
• Understanding the underlying hypothalamic-pituitary-gonadal (HPG) axis activity is key.

Purpose of the Study:

• To investigate hypothalamic-pituitary-gonadal activity in girls with premature thelarche.
• To compare this activity with healthy girls and those with true precocious puberty.
• To elucidate the specific hormonal responses in premature thelarche.

Main Methods:

• Utilized the gonadotropin stimulation test with luteinizing hormone-releasing hormone (LHRH).
• Assessed luteinizing hormone (LH) and follicle-stimulating hormone (FSH) responses.
• Compared hormonal profiles across three groups: premature thelarche, healthy controls, and true precocious puberty.

Main Results:

• Girls with premature thelarche exhibited LH responses similar to healthy controls.
• FSH responses in premature thelarche were comparable to those seen in true precocious puberty.
• This indicates a partial activation of the HPG axis, primarily impacting FSH.

Conclusions:

• Premature thelarche suggests a partial activation of the diencephalic-hypophyseal-gonadal axis.
• The observed FSH response points to an isolated effect on this specific gonadotropin.
• Altered sensitivity of hypothalamic receptors regulating sex maturation is a likely cause.