Modulation of Murine Hippocampal Synaptic Plasticity by Microbial Metabolites: Sex-Specific Effects of the Short-Chain Fatty Acid Butyrate.
Level 5 - mechanism / opinion, no new human data
Preclinical animal and ex vivo tissue experiment
PubMed 42163562 · doi:10.1111/jnc.70475
What was done
Researchers investigated the effects of physiologically relevant concentrations of the short-chain fatty acids (SCFAs) acetate, butyrate, and propionate on ex vivo hippocampal slice electrophysiology in male and female mice. They tested long-term potentiation (LTP), basic synaptic efficacy, and short-term plasticity. They also tested whether pharmacological inhibition of free fatty acid receptor 3 (FFAR3) with beta-hydroxybutyrate (BHB) modulated butyrate-induced effects, and measured cornu ammonis 1 (CA1) hippocampal mRNA expression of FFARs and SCFA transporters.
What was found
A 40-minute exposure to 3 uM butyrate enhanced LTP in hippocampal slices from both male and female mice. Inhibition of FFAR3 via BHB abolished the butyrate-enhanced LTP in slices from female mice, but not male mice; BHB alone had no effect on LTP in either sex. Acetate and propionate showed no significant effect on LTP, baseline synaptic transmission, or short-term plasticity. CA1 mRNA expression of FFARs and SCFA transporters showed no explanatory sex differences. The abstract reported no exact numerical values or effect sizes.
Why it matters
These findings provide direct evidence that microbial metabolites can modulate mammalian hippocampal synaptic plasticity and identify a sex-specific receptor pathway mediating butyrate's central nervous system actions.
Limits
The work is restricted to ex vivo mouse brain tissue, so direct human relevance and behavioral consequences remain unproven. Sample size (number of animals or slices) and quantitative effect sizes with statistical measures were not reported in the abstract.
Cited by
- supports Gut bacteria produce postbiotics like butyrate that directly support neuroplasticity.