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A subset of Roux-en-Y Gastric Bypass bacterial consortium colonizes the gut of non-surgical rats without inducing host-microbial metabolic changes

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Title: A subset of Roux-en-Y Gastric Bypass bacterial consortium colonizes the gut of non-surgical rats without inducing host-microbial metabolic changes
Authors: Liu, Z
Coales, I
Penney, N
McDonald, J
Phetcharaburanin, J
Seyfried, F
Li, J
Item Type: Journal Article
Abstract: Roux-en-Y gastric bypass (RYGB) is an effective weight loss surgery, resulting in a characteristic increase of fecal Gammaproteobacteria. The contribution of this compositional change to metabolic benefits of RYGB is currently debatable. Therefore, this study employed 16S rRNA gene sequencing and metabolic profiling to monitor the dynamic colonization of the RYGB microbial consortium and their metabolic impact on the host. Eleven Wistar rats received vancomycin and enrofloxacin, followed by fecal microbiota transplantation (FMT) of cecal slurry obtained from either RYGB- or sham-operated rats. Urine and feces from the microbiota recipients (RYGB microbiota recipients [RYGBr], n = 6; sham microbiota recipients [SHAMr], n = 5) were collected pre- and post-antibiotics and 1, 3, 6, 9, and 16 days post-FMT. No significant differences in body weight and food intake were observed between RYGBr and SHAMr. While neither group reached the community richness of that of their donors, by day 6, both groups reached the richness and diversity of that prior to antibiotic treatment. However, the typical signature of RYGB microbiome—increased Enterobacteriaceae—was not replicated in these recipients after two consecutive FMT, suggesting that the environmental changes induced by the anatomical rearrangements of RYGB could be key for sustaining such a consortium. The transplanted bacteria did not induce the same metabolic signature of urine and feces as those previously reported in RYGB-operated rats. Future work is required to explore environmental factors that shape the RYGB microbiota in order to further investigate the metabolic functions of the RYGB microbiota, thereby teasing out the mechanisms of the RYGB surgery. IMPORTANCE Roux-en-Y gastric bypass (RYGB) surgery results in a long-term gut bacterial shift toward Gammaproteobacteria in both patients and rodents. The contribution of this compositional shift, or the RYGB bacterial consortium, to the metabolic benefit of the surgery remains debatable. It is unclear how well these bacteria colonize in an anatomically normal gut. This is a fundamental question in both defining the function of the RYGB microbiota and evaluating its potential as a nonsurgical treatment for obesity. We monitored the dynamic colonization of the RYGB bacterial consortium and observed that while approximately one-third of the bacterial taxa from the RYGB donor colonized in the gut of the nonoperated recipients, Gammaproteobacteria were unable to colonize for longer than 3 days. The study highlighted that a successful long-term colonization of Gammaproteobacteria-rich RYGB microbiota in nonsurgical animals requires key environmental factors that may be dictated by the intestinal anatomical modification by the surgery itself.
Issue Date: 8-Dec-2020
Date of Acceptance: 19-Nov-2020
URI: http://hdl.handle.net/10044/1/85870
DOI: 10.1128/mSystems.01047-20
ISSN: 2379-5077
Publisher: American Society for Microbiology
Journal / Book Title: mSystems
Volume: 5
Issue: 6
Copyright Statement: © 2020 Liu et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: Medical Research Council (MRC)
Commission of the European Communities
Funder's Grant Number: MR/P002536/1
Keywords: Science & Technology
Life Sciences & Biomedicine
Multidisciplinary Sciences
Life Sciences & Biomedicine - Other Topics
Science & Technology - Other Topics
Gut microbiome
gestational diabetes mellitus
metagenome-wide association
antibiotic effect
fecal microbiota transplantation
gut microbiota
weight loss surgery
Publication Status: Published
Open Access location: https://msystems.asm.org/content/5/6/e01047-20
Article Number: ARTN e01047
Online Publication Date: 2020-12-08
Appears in Collections:Department of Metabolism, Digestion and Reproduction
Department of Surgery and Cancer
Faculty of Medicine
Department of Brain Sciences
Faculty of Natural Sciences

This item is licensed under a Creative Commons License Creative Commons