Brain-Gut-Microbiota Axis in Alzheimer's Disease

Area of Science:

• Neuroscience
• Microbiology
• Immunology

Background:

• The brain-gut-microbiota axis plays a crucial role in neurodegenerative disorders.
• Alzheimer's disease (AD) involves amyloid beta (Aβ) plaques and neurofibrillary tangles, leading to cognitive decline.
• Gut dysbiosis can increase gut permeability, trigger systemic inflammation, and impair the blood-brain barrier, promoting neuroinflammation.

Purpose of the Study:

• To explore the role of the brain-gut-microbiota axis in Alzheimer's disease pathogenesis.
• To investigate the mechanisms by which gut dysbiosis contributes to neurodegeneration.
• To identify potential preventive and therapeutic strategies for AD targeting the gut microbiota.

Main Methods:

• Review of experimental and clinical data on gut microbiota and neurodegeneration.
• Analysis of the interplay between gut dysbiosis, inflammation, and Aβ pathology.
• Examination of potential amyloid spreading mechanisms across the brain-gut-microbiota axis.

Main Results:

• Gut microbiota alterations are linked to increased inflammation and neurodegeneration in AD.
• Bacterial amyloids may contribute to Aβ misfolding and microglial activation via molecular mimicry.
• Amyloid seeding and propagation can occur across the brain-gut-microbiota axis through various pathways.

Conclusions:

• Gut dysbiosis and associated inflammation are key contributors to AD pathogenesis, especially in the elderly.
• Targeting gut microbiota composition through food-based interventions or probiotics presents promising therapeutic avenues for AD prevention and treatment.