Adrenarche – Causes, Symptoms and Treatment
Adrenarche is a phase of childhood development in which the adrenal cortex begins to produce increasing amounts of androgens. It typically occurs between the ages of 6 and 8.
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Adrenarche is a phase of childhood development in which the adrenal cortex begins to produce increasing amounts of androgens. It typically occurs between the ages of 6 and 8.
What Is Adrenarche?
Adrenarche refers to the maturation of the adrenal cortex (zona reticularis), during which it begins to produce increasing amounts of androgens -- particularly DHEA (dehydroepiandrosterone) and DHEAS (dehydroepiandrosterone sulfate). This process typically begins between the ages of 6 and 8 and is independent of gonadal puberty, meaning it is separate from the maturation of the gonads (ovaries or testes).
Adrenarche is a normal part of childhood development and should not be confused with puberty itself, as it does not initiate sexual maturation in the classic sense but rather activates adrenal androgen production.
Causes and Triggers
The exact mechanisms triggering adrenarche are not yet fully understood. It is believed that maturation of the zona reticularis of the adrenal cortex and changes in the expression of certain steroidogenic enzymes play a central role. Unlike puberty, adrenarche is not primarily driven by gonadotropins (LH and FSH).
- Maturation of the zona reticularis of the adrenal cortex
- Increased expression of steroidogenic enzymes (e.g., CYP17A1)
- Possible influence of growth factors and insulin signaling pathways
- Genetic and metabolic factors
Symptoms and Physical Signs
The physical changes triggered by adrenarche are referred to as pubarche when they become clinically visible. Typical signs include:
- Appearance of pubic and axillary (underarm) hair
- Mild body odor (due to activation of apocrine sweat glands)
- Oily skin and occasionally mild acne
- Mildly accelerated bone maturation
These changes occur without simultaneous breast development or testicular enlargement -- the hallmark signs of gonadal puberty are therefore absent at this stage.
Premature Adrenarche
If the above signs appear before age 8 in girls or before age 9 in boys, the condition is referred to as premature adrenarche (also called premature pubarche). In most cases, this is a benign variant of normal development. However, medical evaluation is recommended to rule out more serious causes, such as:
- Congenital adrenal hyperplasia (CAH) -- a disorder of hormone synthesis in the adrenal glands
- Adrenal tumors
- Central precocious puberty
Children with premature adrenarche have a slightly increased risk of developing polycystic ovary syndrome (PCOS), insulin resistance, or metabolic syndrome later in life, particularly if they are overweight.
Diagnosis
The diagnosis of adrenarche or premature adrenarche is based on a combination of clinical examination and laboratory testing:
- Measurement of DHEAS, testosterone, and other androgens in the blood
- Measurement of 17-hydroxyprogesterone to rule out CAH
- Bone age assessment using an X-ray of the left hand
- Adrenal imaging if indicated (ultrasound or MRI)
- GnRH stimulation test to rule out central precocious puberty
Treatment
Normal adrenarche does not require any treatment. Premature adrenarche without a pathological finding also does not require therapy; however, regular follow-up examinations are recommended.
If an underlying condition requiring treatment is identified (e.g., CAH), specific therapy is initiated -- for example, glucocorticoids to suppress excessive androgen production. Management by a pediatric endocrinologist is essential in such cases.
References
- Auchus RJ, Rainey WE. Adrenarche -- physiology, biochemistry and human disease. Clinical Endocrinology. 2004;60(3):288-296.
- Ibáñez L et al. Early development of adiposity and insulin resistance after precocious pubarche in girls. Journal of Clinical Endocrinology and Metabolism. 1998;83(8):2631-2636.
- European Society for Paediatric Endocrinology (ESPE). Guidelines on the assessment and management of precocious puberty. 2016.
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