期刊
BIOMOLECULES
卷 11, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/biom11081091
关键词
gut-brain axis; neurotransmitters; LC-MS/MS; gut microbiome; Bifidobacteria; GABA
资金
- NIH [K01K12319501]
- National Institute of Diabetes and Digestive and Kidney Diseases [P30-DK-56338]
- BioGaia AB (Stockholm, Sweden)
The study revealed that Bifidobacterium dentium has the capacity to produce the important neurotransmitter gamma-aminobutyric acid (GABA) and can impact neurotransmitter concentrations in vivo, indicating a potential role of B. dentium in neurotransmitter regulation.
Background: Accumulating evidence indicates that the gut microbiota can synthesize neurotransmitters as well as impact host-derived neurotransmitter levels. In the past, it has been challenging to decipher which microbes influence neurotransmitters due to the complexity of the gut microbiota. Methods: To address whether a single microbe, Bifidobacterium dentium, could regulate important neurotransmitters, we examined Bifidobacteria genomes and explored neurotransmitter pathways in secreted cell-free supernatant using LC-MS/MS. To determine if B. dentium could impact neurotransmitters in vivo, we mono-associated germ-free mice with B. dentium ATCC 27678 and examined fecal and brain neurotransmitter concentrations. Results: We found that B. dentium possessed the enzymatic machinery to generate gamma-aminobutyric acid (GABA) from glutamate, glutamine, and succinate. Consistent with the genome analysis, we found that B. dentium secreted GABA in a fully defined microbial media and elevated fecal GABA in B. dentium mono-associated mice compared to germ-free controls. We also examined the tyrosine/dopamine pathway and found that B. dentium could synthesize tyrosine, but could not generate L-dopa, dopamine, norepinephrine, or epinephrine. In vivo, we found that B. dentium mono-associated mice had elevated levels of tyrosine in the feces and brain. Conclusions: These data indicate that B. dentium can contribute to in vivo neurotransmitter regulation.
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