4.6 Article

Effect of Akkermansia muciniphila, Faecalibacterium prausnitzii, and Their Extracellular Vesicles on the Serotonin System in Intestinal Epithelial Cells

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PROBIOTICS AND ANTIMICROBIAL PROTEINS
卷 13, 期 6, 页码 1546-1556

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SPRINGER
DOI: 10.1007/s12602-021-09786-4

关键词

Gut microbiota; Akkermansia muciniphila; Faecalibacterium prausnitzii; Extracellular vesicles; Serotonin; Serotonergic system

资金

  1. Pasteur Institute of Iran [B-9325]

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Akkermansia muciniphila and Faecalibacterium prausnitzii along with their extracellular vesicles can increase serotonin levels in colorectal adenocarcinoma cells and significantly impact the expression of genes related to the serotonin system.
The gastrointestinal (GI) tract is an essential reservoir of serotonin or 5-hydroxytryptamine (5-HT), which possesses a set of bacterial species communities. Intestinal microbiota has the ability to modulate the host's serotonin system. In this regard, we evaluated the effect of Akkermansia muciniphila and Faecalibacterium prausnitzii along with their extracellular vesicles (EVs) on serotonin system-related genes in human epithelial colorectal adenocarcinoma (Caco-2) cells. The differentiated Caco-2 cells were treated with A. muciniphila and F. prausnitzii with the multiplicity of infection ratio of 1 and 10 and the EV concentration of 1 mu g/mL and 50 mu g/mL, respectively. After 24 h, the serotonin level was quantified using an ELISA kit and also the gene expression of serotonin system-related genes was examined using the quantitative real-time PCR method. According to the results, treatment with A. muciniphila and F. prausnitzii-derived EVs increased the serotonin level, while none of the bacteria could affect the serotonin level in the Caco-2 cells. Both bacteria had significant effects on the mRNA expression of serotonin system-related genes in the Caco-2 cells. Moreover, we observed that A. muciniphila and F. prausnitzii-derived EVs could impact the expression of major genes involved in the serotonin system. Our findings showed that A. muciniphila and F. prausnitzii along with their EVs could modulate serotonin system-related genes; hence, they may be useful in microbiota modulation therapies to maintain the homeostasis of the serotonin system.

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