The microbiota-gut-brain axis in hippocampus-dependent learning and memory: current state and future challenges

Area of Science:

• Neuroscience
• Microbiology
• Gut-Brain Axis Research

Background:

• Emerging research highlights the bidirectional communication between gut microbiota and the brain.
• The microbiota-gut-brain axis is primarily studied in stress-related conditions like depression and anxiety.
• Gut microbiota's impact on hippocampal function, learning, and memory is suggested by rodent studies.

Purpose of the Study:

• To review current knowledge on gut microbiota-hippocampus interactions in rodents.
• To propose a unified approach for studying these mechanisms in health and disease.
• To facilitate the translation of preclinical findings to human applications for memory enhancement.

Main Methods:

• Review of four primary gut microbiota-hippocampus pathways in rodents: vagus nerve, HPA axis, neuroactive substance metabolism, and inflammation.
• Proposal for an evaluative framework to test these pathways.
• Assessment of gut microbiota composition's influence on hippocampal function.

Main Results:

• Identified four key routes connecting gut microbiota and the hippocampus in rodents.
• Highlighted the need for a standardized approach to bridge preclinical and clinical research.
• Emphasized the potential of microbiota-based strategies for cognitive function.

Conclusions:

• A structured approach is crucial for understanding microbiota-hippocampus interactions.
• This framework can advance the application of microbiota-based interventions for human cognitive health.
• Further research is needed to optimize microbiota strategies for memory (dys)function.