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Kohei Takahashi1, Kazuhiro Kurokawa1, Kazuya Miyagawa1
1Department of Pharmacology, School of Pharmacy, International University of Health and Welfare, 2600-1 Kitakanemaru, Ohtawara, Tochigi 324-8501, Japan.
Abstract:
The gut microbiota is associated with memory; however, the relationship between dysbiosis-induced memory deficits and hippocampal glutamatergic neurons remains unclear. In our study, a mouse dysbiosis model showed impaired memory-related behavior in the passive avoidance test; decreased expression levels of glutaminase, excitatory amino acid transporter (EAAT)1, EAAT2, vesicular glutamate transporter 2, synaptophysin, brain-derived neurotrophic factor, doublecortin, neuronal nuclear protein, glial fibrillary acidic protein, and S100β; and decreased phosphorylation of N-methyl-D-aspartate receptor subunit 1, calmodulin-dependent protein kinase II, α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor subunit 1, and cAMP response element-binding protein in the hippocampus. This suggests that dysbiosis-induced memory dysfunction is associated with the hippocampal glutamatergic nervous system.
Insights
Gut dysbiosis impairs memory function by affecting hippocampal glutamatergic neurons. This study reveals molecular changes in the hippocampus linked to memory deficits caused by an imbalanced gut microbiota.
Area of Science:
- Neuroscience
- Microbiology
- Gut-brain axis research
Background:
- The gut microbiota plays a role in cognitive functions, including memory.
- The specific mechanisms linking gut dysbiosis to memory impairment, particularly involving hippocampal glutamatergic neurons, are not well understood.
Purpose of the Study:
- To investigate the impact of gut dysbiosis on memory-related behaviors.
- To explore the alterations in hippocampal glutamatergic system components in a mouse model of dysbiosis.
Main Methods:
- Utilized a mouse model of gut dysbiosis.
- Assessed memory-related behavior using the passive avoidance test.
- Quantified the expression levels of key proteins in the glutamatergic system and neuronal markers in the hippocampus via Western blotting or similar techniques.
- Measured the phosphorylation status of critical signaling molecules involved in synaptic plasticity.
Main Results:
- Mice with gut dysbiosis exhibited impaired performance in the passive avoidance test, indicating memory deficits.
- Significant decreases were observed in the expression of glutaminase, excitatory amino acid transporters (EAAT1, EAAT2), vesicular glutamate transporter 2, synaptophysin, BDNF, doublecortin, NeuN, GFAP, and S100β in the hippocampus.
- Reduced phosphorylation levels of NMDA receptor subunit 1, CaMKII, AMPA receptor subunit 1, and CREB were detected in the hippocampus.
Conclusions:
- Gut dysbiosis is associated with significant memory dysfunction.
- These memory deficits are linked to alterations within the hippocampal glutamatergic system, affecting neurotransmitter synthesis, transport, synaptic structure, and signaling pathways crucial for memory formation and consolidation.
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