Gut-Brain Axis and Bile Acid Signaling: Linking Microbial Metabolism to Brain Function and Metabolic Regulation

Area of Science:

• Neuroscience
• Microbiology
• Metabolism

Background:

• The gut-brain axis involves bidirectional communication between gut microbiota and the central nervous system (CNS).
• Bile acids are crucial metabolites produced by the gut microbiota that significantly impact CNS function.
• These metabolites modulate metabolic and neuroendocrine pathways, influencing neuronal activity and energy balance.

Purpose of the Study:

• To review the mechanisms by which bile acids mediate gut microbiota-CNS communication.
• To explore the role of bile acids in regulating metabolic and neuroendocrine functions.
• To highlight the therapeutic potential of targeting bile acid signaling in metabolic and neurodegenerative diseases.

Main Methods:

• Literature review integrating microbiological, metabolic, and neuroendocrine research.
• Analysis of bile acid modifications by gut microbiota.
• Examination of bile acid interactions with CNS receptors like FXR and TGR5.

Main Results:

• Microbiota-modified bile acids act as signaling molecules influencing neuronal activity, appetite, glucose metabolism, and energy balance.
• Bile acids impact the CNS directly and indirectly through endocrine and immune pathways.
• Receptor activation (FXR, TGR5) by bile acids is a key mechanism linking gut microbial activity to brain function.

Conclusions:

• Bile acids are critical messengers in the gut-brain axis, connecting microbial metabolism to CNS function.
• Understanding these interactions opens avenues for novel therapeutic strategies.
• Targeting bile acid pathways may offer new treatments for metabolic and neurodegenerative disorders.