Brain structure in autoimmune Addison's disease

Area of Science:

• Neuroimaging
• Endocrinology
• Autoimmune Diseases

Background:

• Long-term cortisol level disturbances may impact brain structure.
• Autoimmune Addison's disease (AAD) is characterized by adrenal insufficiency and potential hormonal imbalances.
• Understanding the neuroanatomical consequences of AAD is crucial for patient management.

Purpose of the Study:

• To investigate gray and white matter brain structure in young adults with AAD.
• To compare brain structure between individuals with AAD and healthy controls.
• To explore the relationship between glucocorticoid (GC) replacement dose and brain structure in AAD patients.

Main Methods:

• Magnetic resonance imaging (MRI) including T1- and diffusion-weighted sequences.
• Analysis of cortical thickness, surface area, gray matter volume (FreeSurfer), and white matter microstructure (FSL-TBSS).
• Comparison of 52 AAD patients (aged 19-43) with 70 healthy controls.

Main Results:

• Individuals with AAD exhibited 4.3% smaller total brain volume compared to controls.
• No significant regional structural differences were found after correcting for head size, except for reduced right superior parietal cortex volume in males with AAD.
• Higher GC replacement doses in AAD patients were associated with smaller total brain volume and reduced volumes in specific brain regions (left lingual gyrus, left rostral anterior cingulate cortex, right supramarginal gyrus).

Conclusions:

• Brain structure in young adults with AAD appears relatively unaffected, with the exception of smaller total brain volume and potential parietal cortex sensitivity in males.
• The association between GC replacement dose and reduced brain volume in AAD patients is a potential concern requiring further research.
• Long-term hormonal dysregulation and treatment in AAD may have subtle but significant effects on brain morphology.