Increase in fecal primary bile acids and dysbiosis in patients with diarrhea‐predominant irritable bowel syndrome
H Duboc, D Rainteau, S Rajca… - …, 2012 - Wiley Online Library
H Duboc, D Rainteau, S Rajca, L Humbert, D Farabos, M Maubert, V Grondin, P Jouet…
Neurogastroenterology & Motility, 2012•Wiley Online LibraryBackground Irritable bowel syndrome (IBS) is a multifactorial disease for which a dysbiosis
of the gut microbiota has been described. Bile acids (BA) could play a role as they are
endogenous laxatives and are metabolized by gut microbiota. We compared fecal BA
profiles and microbiota in healthy subjects (HS) and patients with diarrhea‐predominant IBS
(IBS‐D), and we searched for an association with symptoms. Methods Clinical features and
stool samples were collected in IBS‐D patients and HS. Fecal BA profiles were generated …
of the gut microbiota has been described. Bile acids (BA) could play a role as they are
endogenous laxatives and are metabolized by gut microbiota. We compared fecal BA
profiles and microbiota in healthy subjects (HS) and patients with diarrhea‐predominant IBS
(IBS‐D), and we searched for an association with symptoms. Methods Clinical features and
stool samples were collected in IBS‐D patients and HS. Fecal BA profiles were generated …
Abstract
Background Irritable bowel syndrome (IBS) is a multifactorial disease for which a dysbiosis of the gut microbiota has been described. Bile acids (BA) could play a role as they are endogenous laxatives and are metabolized by gut microbiota. We compared fecal BA profiles and microbiota in healthy subjects (HS) and patients with diarrhea‐predominant IBS (IBS‐D), and we searched for an association with symptoms.
Methods Clinical features and stool samples were collected in IBS‐D patients and HS. Fecal BA profiles were generated using HPLC coupled to tandem mass spectrometry. The fecal microbiota composition was assessed by q‐PCR targeting dominant bacterial groups and species implicated in BA transformation.
Key Results Fourteen IBS‐D patients and 18 HS were included. The two groups were comparable in terms of age and sex. The percentage of fecal primary BA was significantly higher in IBS‐D patients than in HS, and it was significantly correlated with stool consistency and frequency. Fecal counts of all bacteria, lactobacillus, coccoides, leptum and Faecalibacterium prausnitzii were similar. There was a significant increase of Escherichia coli and a significant decrease of leptum and bifidobacterium in IBS‐D patients.
Conclusions & Inferences We report an increase of primary BA in the feces of IBS‐D patients compared to HS, correlated with stool consistency and frequency. A dysbiosis of different bacterial groups was detected, some of them involved in BA transformation. As the gut microbiota is the exclusive pathway to transform primary into secondary BA, this suggests a functional consequence of dysbiosis, leading to lower BA transformation.
Wiley Online Library