Reduced morning cortisol secretion in patients with multiple system atrophy

Area of Science:

• Neuroendocrinology
• Neurology

Background:

• Multiple system atrophy (MSA) is a progressive neurodegenerative disorder.
• Cortisol secretion follows a diurnal rhythm, regulated by the hypothalamic-pituitary-adrenal (HPA) axis.
• Autonomic nervous system dysfunction is a key feature of MSA.

Purpose of the Study:

• To investigate diurnal cortisol secretion patterns in patients with MSA.
• To compare cortisol levels in MSA patients with healthy controls and patients with cerebral infarction.

Main Methods:

• Plasma cortisol concentrations were measured at 4-hour intervals over 24 hours in 20 MSA patients.
• Control groups included 10 age-matched healthy individuals and 20 patients with cerebral infarction without hypothalamic lesions.

Main Results:

• Patients with MSA exhibited significantly lower morning (8 A.M.) plasma cortisol concentrations compared to both control groups.
• The observed reduction in morning cortisol in MSA is strongly associated with autonomic nervous system dysfunction.

Conclusions:

• Morning cortisol secretion is aberrant in patients with multiple system atrophy.
• The HPA axis may be affected by the autonomic nervous system dysfunction characteristic of MSA.