Adrenergic dysfunction in hereditary adult-onset leukodystrophy

Area of Science:

• Neurology
• Autonomic Neuroscience
• Endocrinology

Background:

• Autosomal dominant adult-onset leukodystrophy (ADAL) is a rare genetic disorder affecting white matter in the brain.
• Autonomic dysfunction is increasingly recognized as a feature of various neurological disorders.
• Understanding the specific autonomic deficits in ADAL is crucial for patient management.

Purpose of the Study:

• To investigate the pressor response to norepinephrine infusion in ADAL patients.
• To evaluate cardiovascular and catecholamine responses during insulin-induced hypoglycemia in ADAL.
• To identify the nature and extent of autonomic nervous system involvement in ADAL.

Main Methods:

• Norepinephrine infusion and dose-response curve analysis.
• Assessment of cardiovascular parameters (e.g., blood pressure).
• Measurement of plasma catecholamine levels (norepinephrine and epinephrine) during hypoglycemia.

Main Results:

• A leftward shift in the norepinephrine dose-response curve and low baseline norepinephrine suggest denervation supersensitivity.
• This indicates a distal lesion affecting sympathetic noradrenergic neurons in ADAL patients.
• Absence of an epinephrine response to hypoglycemia points to severe adrenal medullary dysfunction alongside autonomic neuropathy.

Conclusions:

• Patients with autosomal dominant adult-onset leukodystrophy exhibit significant sympathetic noradrenergic denervation.
• Autonomic neuropathy in these patients is associated with impaired adrenal medullary function.
• These findings highlight the complex neurological and endocrine involvement in ADAL.