The gut-brain axis in Alzheimer's disease: how gut microbiota modulate microglial function

Area of Science:

• Neuroscience
• Microbiology
• Immunology

Background:

• Alzheimer's disease (AD) pathogenesis involves amyloid-beta, Tau pathology, and neuroinflammation.
• Microglia, the CNS immune cells, play a crucial role in AD-related neuroinflammation and cognitive function.
• Emerging evidence links gut microbiota dysregulation to AD development.

Purpose of the Study:

• To review the direct and indirect effects of gut microbiota on microglia.
• To explore the role of gut microbiota in Alzheimer's disease pathogenesis.
• To discuss gut microbiota-based therapeutic strategies for AD.

Main Methods:

• Literature review of studies investigating the gut microbiota-microglia axis in AD.
• Analysis of mechanisms linking gut microbiota to microglial phenotype and function.
• Synthesis of current therapeutic approaches targeting gut microbiota for AD.

Main Results:

• Gut microbiota and its derivatives impact microglia through direct metabolite action and indirect immune/neurotransmitter regulation.
• Microglial dysregulation driven by gut microbiota contributes to neuroinflammation in AD.
• Therapeutic strategies include dietary interventions, probiotics, fecal microbiota transplantation, and traditional Chinese medicine.

Conclusions:

• The gut microbiota-microglia axis is a significant factor in Alzheimer's disease.
• Targeting gut microbiota presents promising therapeutic avenues for AD.
• Further research is essential to fully elucidate and optimize these interventions for AD treatment.