Subcortical brain atrophy in Gulf War Illness.

Area of Science:

• Neuroscience
• Toxicology
• Veterans Health

Background:

• Gulf War Illness (GWI) is a complex multisystem disorder affecting veterans of the 1990-1991 Gulf War.
• Neurological, cognitive, and mood symptoms are prominent in GWI, suggesting significant brain involvement.
• While brain dysfunction is documented, structural brain abnormalities in GWI remain debated.

Purpose of the Study:

• To investigate and quantify subcortical brain structural abnormalities in Gulf War Illness.
• To determine the specific brain regions affected by atrophy in GWI patients.
• To explore potential correlations between observed atrophy patterns and known environmental exposures of Gulf War veterans.

Main Methods:

• Utilized neuroimaging techniques to assess brain structure in Gulf War Illness veterans.
• Quantified subcortical gray matter volume, focusing on regions such as the brainstem, cerebellum, thalamus, basal ganglia, amygdala, and diencephalon.
• Compared atrophy patterns in GWI patients with known patterns of toxic encephalopathy.

Main Results:

• Identified substantial (~10%) subcortical brain atrophy in Gulf War Illness patients.
• The most significant atrophy was observed in the brainstem, followed by the cerebellum and thalamus.
• The distribution of atrophy suggests a pattern consistent with toxic encephalopathy, potentially linked to environmental exposures.

Conclusions:

• Gulf War Illness is associated with significant subcortical brain atrophy, particularly affecting interconnected regions via the brainstem.
• The observed atrophy patterns resemble those seen in toxic encephalopathy, suggesting an environmental toxicological etiology for GWI.
• Potential exposure to a range of chemical and biological agents during the Gulf War may underlie the observed neurodegeneration.