Interplay between bile acid metabolism and microbiota in irritable bowel syndrome - Université Paris Cité Accéder directement au contenu
Article Dans Une Revue Neurogastroenterology & Motility Année : 2016

Interplay between bile acid metabolism and microbiota in irritable bowel syndrome

Résumé

Background Irritable bowel syndrome (IBS) physiopathology is multifactorial and roles for both microbiota and bile acid (BA) modifications have been proposed. We investigated role of dysbiosis, transit pattern and BA metabolism in IBS. Methods Clinical data, serum, and stool samples were collected in 15 healthy subjects (HS), 16 diarrhea-predominant (IBSD) and 15 constipation-predominant IBS (IBS-C). Fecal microbiota composition was analyzed by real-time PCR. Sera and fecal BA profiles, 7 alpha-C4 levels, and in vitro BA transformation activity by fecal microbiota were measured by mass spectrometry. Serum Fibroblast Growth Factor 19 (FGF19) was assayed by ELISA. Keys Results Dysbiosis was present in IBS patients with an increase in Escherichia coli in IBS-D patients (p = 0.03), and an increase in Bacteroides (p = 0.01) and Bifidobacterium (p = 0.04) in IBS-C patients. Sera primary and amino-conjugated BA were increased in IBS-D (63.5 +/- 5.5%, p = 0.01 and 78.9 +/- 6.3%, p = 0.03) and IBS-C patients (55.9 +/- 5.5%, p = 0.04 and 65.3 +/- 6.5%, p = 0.005) compared to HS (37.0 +/- 5.8% and 56.7 +/- 8.1%). Serum 7a-C4 and FGF19 levels were not different among all three groups. Fecal primary BA were increased in IBS-D patients compared to HS, including chenodeoxycholic acid which has laxative properties (25.6 +/- 8.5% vs 3.5 +/- 0.6%, p = 0.005). Bile acid deconjugation activity was decreased in IBS-D (p = 0.0001) and IBS-C (p = 0.003) feces. Abdominal pain was positively correlated with serum (R = 0.635, p < 0.001) and fecal (R = 0.391, p = 0.024) primary BA. Conclusions & Inferences Different sera and fecal BA profiles in IBS patients could be secondary to dysbiosis and further differences between IBS-C and IBS-D could explain stool patterns. This study opens new fields in IBS physiopathology and suggests that modification of BA profiles could have therapeutic potential.

Domaines

Chimie organique
Fichier non déposé

Dates et versions

hal-01302531 , version 1 (14-04-2016)

Identifiants

Citer

M. Dior, H. Delagrèverie, H. Duboc, P. Jouet, B. Coffin, et al.. Interplay between bile acid metabolism and microbiota in irritable bowel syndrome. Neurogastroenterology & Motility, 2016, 28 (9), pp.1330-1340. ⟨10.1111/nmo.12829⟩. ⟨hal-01302531⟩
148 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More