Greater Neuroimmune System Deficit in Women Than Men With Alcohol Use Disorder

Area of Science:

• Neuroscience
• Immunology
• Addiction Medicine

Background:

• Women exhibit heightened vulnerability to alcohol-related health issues, including neurodegeneration.
• Alcohol consumption activates neuroimmune cells like microglia, potentially leading to neuronal damage.
• Sex differences in neuroimmune responses to alcohol use disorder (AUD) require further investigation for effective treatments.

Purpose of the Study:

• To investigate sex differences in neuroimmune mechanisms underlying AUD.
• To examine the relationship between TSPO availability, AUD, and neurocognitive function in men and women.

Main Methods:

• Positron emission tomography (PET) imaging using [11C]PBR28 to measure translocator protein (TSPO) availability in brain regions.
• Study included 41 individuals with mild-to-moderate AUD (20 women) and 37 sex-matched controls.
• Neurocognitive function, particularly executive function, was assessed.

Main Results:

• Individuals with AUD had lower TSPO availability across all brain regions compared to controls.
• Women with AUD showed significantly lower TSPO availability (21% reduction) in all measured regions compared to female controls.
• Women with AUD performed worse on executive function tasks, with trends linking lower hippocampal and cerebellar TSPO to executive function deficits.

Conclusions:

• This study reveals significantly lower TSPO levels in women with AUD compared to men, indicating greater neuroinflammation.
• The findings suggest that women with AUD may particularly benefit from neuroimmune-modulating therapies.
• Understanding sex-specific neuroimmune changes is crucial for developing targeted AUD treatments.