Abstract
Background
Red chilli pepper (Capsicum annuum; RP) is a popular spice containing the active compound capsaicin. Indigenous gut bacteria and metabolism can affect host health. The functions of capsaicin, including the regulation of metabolic health and anti-oxidant properties, may be correlated with the gut microbiota.
Methods
To identify indigenous gut bacteria that are responsive to RP, Institute of Cancer Research mice fed a diet with no fibre or with 5% (w/w) RP for 14 days. Additionally, human stool samples collected from four healthy volunteers were incubated without (control) or with 2% (w/v) RP at 37 °C for 24 h. Microbiota in murine caecal samples and human faecal cultures were analysed using 16S rRNA (V4) amplicon sequencing.
Results
Compared with the microbiota in mice fed no-fibre diets, Lachnospiraceae spp.-, Muribaculaceae spp.-, and Phacaeicola vulgatus-like bacteria were defined as murine RP-responsive indigenous gut bacteria (RP-RIB). In the human faecal cultures, acetate and propionate levels were higher in RP cultures than in the control cultures. Subdoligranulum spp.-, Blautia spp.-, Faecalibacterium prausnitzii-, P. vulgatus-, and Prevotella copri-like bacteria were defined as human RP-RIB. Compared with control culture Fe-reducing power was increased in the culture with RP.
Conclusion
RP increases the amount of short-chain fatty acid–producing bacteria and beneficial gut bacteria in mouse and human faecal cultures. Overall, RP could have a positive effect on the host by altering the gut microbiota.
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Funding
This work was partially supported by the Yamazaki Spice Promotion Foundation, Tokyo, Japan.
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YX: Conceptualisation, Methodology, Validation, Formal analysis, Investigation, Resources, Data curation, Writing—original draft, Visualisation. GL: Investigation, Data curation, MY: Investigation, HT: Conceptualisation, Methodology, Supervision. TK: Conceptualisation, Methodology, Validation, Formal analysis, Resources, Data curation, Writing—review & editing, Visualisation, Supervision, Project administration.
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This study was approved by the Animal Experiment Committee of the Tokyo University of Marine Science and Technology (Approval No. H31-5), and the Committee for Research Involving Human Subjects of the Tokyo University of Marine Science and Technology approved the study protocol (Approval no. R03-001).
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Xia, Y., Lee, G., Yamamoto, M. et al. Detection of indigenous gut bacteria related to red chilli pepper (Capsicum annuum) in murine caecum and human faecal cultures. Mol Biol Rep 49, 10239–10250 (2022). https://doi.org/10.1007/s11033-022-07875-3
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DOI: https://doi.org/10.1007/s11033-022-07875-3