Case Control Study
Copyright ©The Author(s) 2020. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Dec 7, 2020; 26(45): 7153-7172
Published online Dec 7, 2020. doi: 10.3748/wjg.v26.i45.7153
Altered metabolism of bile acids correlates with clinical parameters and the gut microbiota in patients with diarrhea-predominant irritable bowel syndrome
Wei Wei, Hui-Fen Wang, Yu Zhang, Yan-Li Zhang, Bing-Yu Niu, Shu-Kun Yao
Wei Wei, Yu Zhang, Graduate School, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100730, China
Wei Wei, Hui-Fen Wang, Yu Zhang, Yan-Li Zhang, Bing-Yu Niu, Shu-Kun Yao, Department of Gastroenterology, China-Japan Friendship Hospital, Beijing 100029, China
Bing-Yu Niu, Graduate School, Beijing University of Chinese Medicine, Beijing 100029, China
Author contributions: Wei W designed and performed the study, analyzed the data, and drafted the manuscript; Wei W, Wang HF, Zhang YL, and Niu BY collected the clinical data and fecal samples from subjects; Zhang Y gave guidance on experiment operation and data interpretation, and contributed to manuscript revision; Yao SK designed the study, supervised the study performance, revised the manuscript, and obtained the funding.
Supported by the National Key Technology Support Program during “12th Five-Year Plan” Period of China, No. 2014BAI08B00; the Leap-forward Development Program for Beijing Biopharmaceutical Industry (G20), No. Z171100001717008; and the Project “The role of the gut microbiota and metabolites in the pathogenesis of diarrhea-predominant irritable bowel syndrome” of China-Japan Friendship Hospital, No. 2019-64-K44.
Institutional review board statement: This study was approved by the Ethics Committee of China-Japan Friendship Hospital (No. 2019-64-K44).
Informed consent statement: All study participants provided written informed consent prior to study enrollment.
Conflict-of-interest statement: All authors report no conflicts of interest.
Data sharing statement: No additional data are available.
STROBE statement: The authors have read the STROBE Statement-checklist of items, and the manuscript was prepared and revised according to the STROBE Statement-checklist of items.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See:
Corresponding author: Shu-Kun Yao, MD, PhD, Professor, Department of Gastroenterology, China-Japan Friendship Hospital, No. 2 Yinghua East Street, Chaoyang District, Beijing 100029, China.
Received: August 17, 2020
Peer-review started: August 17, 2020
First decision: September 12, 2020
Revised: September 21, 2020
Accepted: October 13, 2020
Article in press: October 13, 2020
Published online: December 7, 2020
Core Tip

Core Tip: This study comprehensively investigated the fecal bile acid profile of irritable bowel syndrome with predominant diarrhea (IBS-D) patients and healthy controls, and the correlations between bile acids (BAs) and clinical characteristics as well as the gut microbiota of IBS-D patients. We found that the composition of fecal BAs in IBS-D patients is featured by increased primary BAs and decreased secondary BAs, which was associated with diarrhea and visceral hypersensitivity. The abnormality of BAs might be induced by dysbiosis in IBS-D patients, especially the reduction of genera in the Ruminococcaceae family, which contains the majority of bacteria that are capable of converting primary BAs into secondary BAs.