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논문 기본 정보

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학술저널
저자정보
Shigeki Bamba (Shiga University of Medical Science) Osamu Inatomi (Shiga University of Medical Science) Atsushi Nishida (Shiga University of Medical Science) Masashi Ohno (Shiga University of Medical Science) Takayuki Imai (Shiga University of Medical Science) Kenichiro Takahashi (Shiga University of Medical Science) Yuji Naito (Kyoto Prefectural University of Medicine) Junichi Iwamoto (Department of Gastroenterology and Hepatology Tokyo Medical University Ibaraki Medical Center) Akira Honda (Tokyo Medical University Ibaraki Medical Center) Naohiro Inohara (Department of Pathology University of Michigan Medical School) Akira Andoh (Shiga University of Medical Science)
저널정보
대한장연구학회 Intestinal research Intestinal research Vol.20 No.3
발행연도
2022.7
수록면
370 - 380 (11page)
DOI
10.5217/ir.2021.00054

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Background/Aims: Crosstalk between the gut microbiota and bile acid plays an important role in the pathogenesis of gastrointestinal disorders. We investigated the relationship between microbial structure and bile acid metabolism in the ileal mucosa of Crohn’s disease (CD).Methods: Twelve non-CD controls and 38 CD patients in clinical remission were enrolled. Samples were collected from the distal ileum under balloon-assisted enteroscopy. Bile acid composition was analyzed by liquid chromatography-mass spectrometry. The gut microbiota was analyzed by 16S rRNA gene sequencing.Results: The Shannon evenness index was significantly lower in endoscopically active lesions than in non-CD controls. β-Diversity, evaluated by the UniFrac metric, revealed a significant difference between the active lesions and non-CD controls (<i>P</i>=0.039). The relative abundance of <i>Escherichia</i> was significantly higher and that of <i>Faecalibacterium</i> and <i>Roseburia</i> was significantly lower in CD samples than in non-CD controls. The increased abundance of <i>Escherichia</i> was more prominent in active lesions than in inactive lesions. The proportion of conjugated bile acids was significantly higher in CD patients than in non-CD controls, but there was no difference in the proportion of primary or secondary bile acids. The genera <i>Escherichia</i> and <i>Lactobacillus</i> were positively correlated with the proportion of conjugated bile acids. On the other hand, <i>Roseburia</i>, <i>Intestinibacter</i>, and <i>Faecalibacterium</i> were negatively correlated with the proportion of conjugated bile acids.Conclusions: Mucosa-associated dysbiosis and the alteration of bile acid composition were identified in the ileum of CD patients. These may play a role in the pathophysiology of ileal lesions in CD patients.

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