Abstract
Gamma-aminobutyric acid (GABA) is considered as a potential candidate substance that mediates the effects of intestinal bacteria on human mental health. In the present study, we evaluated the effect of water-soluble cellulose acetate (WSCA), a type of cellulose ester, on fermentation and microbial profiles, and GABA production in human stool cultures prepared from fresh feces from volunteers. In addition, the GABA-producing ability of Bacteroides uniformis, which can utilize WSCA, was evaluated in a pure-culture study. All incubations were conducted anaerobically. WSCA supplementation increased (P < 0.05) acetate and propionate production and decreased (P < 0.05) the pH in human fecal cultures. WSCA significantly altered the microbiota, selectively increasing the relative abundance of B. uniformis (P < 0.05). Pure-culture study results revealed that B. uniformis produces GABA, possibly via a glutamate-dependent acid resistance system under low pH conditions. In conclusion, WSCA could be a potential prebiotic material that is fermented by intestinal bacteria and increases short-chain fatty acid and GABA production in the human gut. Bacteroides uniformis might play an important role in both WSCA degradation and GABA production in the intestine.
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All data and material are available with corresponding author.
Code Availability
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Abbreviations
- CA:
-
Cellulose acetate
- CCS:
-
Circular consensus reads
- GABA:
-
Gamma-aminobutyric acid
- MM:
-
Minimal medium
- PCoA:
-
Principal coordinate analysis
- qPCR:
-
Quantitative real-time PCR
- SCFAs:
-
Short-chain fatty acids
- WSCA:
-
Water-soluble cellulose acetate
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HY and YK designed this study. HY performed the research, analyzed the data, and wrote the paper; HM assisted the data analysis. HM, YS, SK, SS and YK revised the manuscript.
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The present study was carried out according to the Hokkaido University Guidelines for Animal Experiments (2007) and the Act on Welfare and Management of Animals (2005). The study involving human stool cultures was approved by the Ethics Committee of the Research Faculty of Agriculture, Hokkaido University (approval number: H301210-No.2).
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Yamada, H., Miura, H., Suzuki, Y. et al. In vitro Effects of Cellulose Acetate on Fermentation Profiles, the Microbiome, and Gamma-aminobutyric Acid Production in Human Stool Cultures. Curr Microbiol 80, 284 (2023). https://doi.org/10.1007/s00284-023-03383-0
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DOI: https://doi.org/10.1007/s00284-023-03383-0