Antibiotics unleash neuroinflammation.

Area of Science:

• Immunology
• Neuroscience
• Microbiology

Background:

• Acute graft-versus-host disease (aGVHD) can cause significant neuroinflammation and cognitive impairment.
• The gut microbiome's role in modulating systemic inflammation and its impact on the central nervous system is increasingly recognized.

Purpose of the Study:

• To investigate the mechanisms by which the gut microbiome influences neuroinflammation and neurocognitive outcomes in aGVHD.
• To identify specific microbial metabolites involved in this neuroprotective process.

Main Methods:

• Utilized aGVHD mouse models.
• Analyzed gut microbiome composition and metabolite profiles.
• Assessed microglial activation markers in the brain.
• Investigated the effects of specific microbial metabolites on neuroinflammation.

Main Results:

• The gut microbiome significantly limited neuroinflammation and preserved neurocognitive function in aGVHD.
• Microglial activation was modulated by gut microbial metabolites.
• The microbial metabolite 4-trimethylaminobutyric acid (TMAVA) was identified as a key mediator.

Conclusions:

• Gut microbiome metabolites, particularly TMAVA, play a crucial role in mitigating neuroinflammation and neurocognitive decline during aGVHD.
• Targeting the gut microbiome or its metabolites represents a potential therapeutic strategy for aGVHD-associated neurological complications.