Bariatric/Metabolic Surgery Induces Noticeable Changes of Microbiota and Their Secreting Extracellular Vesicle Composition in the Gut
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Microbial ecology is reported to be an important regulator of energy homeostasis and glucose metabolism. Microbes secrete extracellular vesicles (EVs) during their proliferation and death to communicate with other cells. To investigate the roles of gut microbiota in glucose metabolism, we analyzed serial changes of gut microbe and microbial EV composition before and after bariatric/metabolic surgery (BMS).
Twenty-eight Wistar rats were fed on high-fat diet (HFD) to induce obesity and diabetes. Five of them compared with 5 rats fed on regular chow diet (RCD). Among the remaining 23 rats, Roux-en-Y gastric bypass (RYGB) (n = 10), sleeve gastrectomy (SG) (n = 10), or sham operation (n = 3) was randomly performed. Gut microbiota and EVs from fecal samples were analyzed by 16S rDNA amplicon sequencing.
The present study showed that microbial diversity was decreased in HFD-fed rats versus RCD-fed rats. In addition, BMS reversed glucose intolerance and microbial richness which were induced by HFD. In terms of microbiota and microbial EV composition, both RYGB and SG enhance the composition of phyla Proteobacteria, Verrucomicrobia, and their secreting EVs, but decrease phylum Firmicutes and its EVs. We tried to demonstrate specific genera showed a significant compositional difference in obesity/diabetes-induced rats compared with normal rats and then restored similarly toward normal rats’ level after BMS. At the genus level, Lactococcus, Ruminococcus, Dorea in Firmicutes(p), Psychrobacter in Proteobacteria(p), and Akkermansia in Verrucomicrobia(p) fit these conditions after BMS.
We suggest that these genera are the candidates contributing to obesity and diabetes improvement mechanism after BMS.
KeywordsGut microbiota Extracellular vesicle Obesity Diabetes Bariatric/metabolic surgery
This study was presented at the 22nd World Congress of international federation for the surgery of Obesity and Metabolic Disorders (IFSO 2017).
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016R1D1A1B03932360).
Compliance with Ethical Standards
The study protocol was reviewed and approved by the Institutional Animal Care and Use Committee of Ewha Womans University Mokdong Hospital (IACUC approval no. 15-0292).
Conflict of Interest
The authors declare that they have no conflict of interest.
The research followed all applicable institutional and/or national guidelines for the care and use of animals.
- 1.Obesity and overweight fact sheet 2018. Available at: http://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight. Accessed July 31, 2018.
- 2.Schauer PR, Burguera B, Ikramuddin S, et al. Effect of laparoscopic Roux-en Y gastric bypass on type 2 diabetes mellitus. Ann Surg. 2003;238:5.Google Scholar
- 3.American Society for Metabolic and Bariatric Surgery. Type 2 diabetes and obesity: twin epidemics: American Society for Metabolic and Bariatric Surgery; 2013. https://asmbs.org/resources/weight-and-type-2-diabetes-after-bariatric-surgery-fact-sheet.
- 13.Yanez-Mo M, Siljander PR, Andreu Z, et al. Biological properties of extracellular vesicles and their physiological functions. J Extracellular Vesicles 2015;4:UNSP 27066.Google Scholar
- 19.Guo Y, Liu CQ, Shan CX, et al. Gut microbiota after Roux-en-Y gastric bypass and sleeve gastrectomy in a diabetic rat model: increased diversity and associations of discriminant genera with metabolic changes. Diabetes Metab Res Rev. 2017;33 https://doi.org/10.1002/dmrr.2857.