Abstract
Background
The intestinal microbiome is involved in the pathogenesis of chronic kidney disease (CKD). Despite its importance, the microbiome of the small intestinal mucosa has been little studied due to sampling difficulties, and previous studies have mainly focused on fecal sources for microbiome studies. We aimed to characterize the small intestinal microbiome of CKD patients by studying the microbiome collected from duodenal and fecal samples of CKD patients and healthy controls.
Methods
Overall, 28 stage 5 CKD patients and 21 healthy participants were enrolled. Mucosal samples were collected from the deep duodenum during esophagogastroduodenoscopy and fecal samples were also collected. The 16S ribosomal RNA gene sequencing using Qiime2 was used to investigate and compare the microbial structure and metagenomic function of the duodenal and fecal microbiomes.
Results
The duodenal flora of CKD patients had decreased alpha diversity compared with the control group. On the basis of taxonomic composition, Veillonella and Prevotella were significantly reduced in the duodenal flora of CKD patients. The tyrosine and tryptophan metabolic pathways were enhanced in the urea toxin-related metabolic pathways based on the Kyoto Encyclopedia of Genes and Genomes database.
Conclusion
The small intestinal microbiome in CKD patients is significantly altered, indicating that increased intestinal permeability and production of uremic toxin may occur in the upper small intestine of CKD patients.
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Acknowledgements
We thank Wendy Hempstock, PhD, from Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript.
Funding
This study was supported by JSPS KAKENHI Grant Number JP21K06783, Grant-in-Aid for Scientific Research C.
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Conceptualization: MK, TT, TN, JU, KK, SF, YM, and TM contributed to the conception and design of this study. MK, TN, TT, and TK proofread this manuscript. H.S. was central to the acquisition of the sequence data. All the authors read and approved the final manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Bioethics Committee of the Kyushu University Medical School District Office (Permit No. 2020-332).
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Kondo, M., Torisu, T., Nagasue, T. et al. Duodenal microbiome in chronic kidney disease. Clin Exp Nephrol 28, 263–272 (2024). https://doi.org/10.1007/s10157-023-02434-x
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DOI: https://doi.org/10.1007/s10157-023-02434-x