Abstract

Roux-en-Y gastric bypass (RYGB) and laparoscopic adjustable gastric banding (LAGB) are anatomically different bariatric operations. RYGB achieves greater weight loss compared with LAGB. Changes in the gut microbiome have been documented after RYGB, but not LAGB, and the microbial contribution to sustainable surgical weight loss warrants further evaluation. We hypothesized that RYGB imposes greater changes on the microbiota and its metabolism than LAGB, and that the altered microbiota may contribute to greater weight loss. Using multi-omic approaches, we analyzed fecal microbial community structure and metabolites of pre-bariatric surgery morbidly obese (PreB-Ob), normal weight (NW), post-RYGB, and post-LAGB participants. RYGB microbiomes were significantly different from those from NW, LAGB and PreB-Ob. Microbiome differences between RYGB and PreB-Ob populations were mirrored in their metabolomes. Diversity was higher in RYGB compared with LAGB, possibly because of an increase in the abundance of facultative anaerobic, bile-tolerant and acid-sensible microorganisms in the former. Possibly because of lower gastric acid exposure, phylotypes from the oral cavity, such as Escherichia, Veillonella and Streptococcus, were in greater abundance in the RYGB group, and their abundances positively correlated with percent excess weight loss. Many of these post-RYGB microorganisms are capable of amino-acid fermentation. Amino-acid and carbohydrate fermentation products - isovalerate, isobutyrate, butyrate and propionate - were prevalent in RYGB participants, but not in LAGB participants. RYGB resulted in greater alteration of the gut microbiome and metabolome than LAGB, and RYGB group exhibited unique microbiome composed of many amino-acid fermenters, compared with nonsurgical controls.

Original languageEnglish (US)
Pages (from-to)2047-2058
Number of pages12
JournalISME Journal
Volume11
Issue number9
DOIs
StatePublished - Sep 1 2017

Fingerprint

bariatric surgery
Gastric Bypass
Microbiota
bypass
Weight Loss
metabolite
Stomach
stomach
weight loss
metabolites
Bariatric Surgery
Metabolome
amino acid
metabolome
Amino Acids
microbiome
loss
Fermentation
fermentation
amino acids

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Distinctive microbiomes and metabolites linked with weight loss after gastric bypass, but not gastric banding. / Ilhan, Zehra Esra; Dibaise, John K.; Isern, Nancy G.; Hoyt, David W.; Marcus, Andrew; Kang, Dae Wook; Crowell, Michael D.; Rittmann, Bruce; Krajmalnik-Brown, Rosa.

In: ISME Journal, Vol. 11, No. 9, 01.09.2017, p. 2047-2058.

Research output: Contribution to journalArticle

Ilhan, Zehra Esra ; Dibaise, John K. ; Isern, Nancy G. ; Hoyt, David W. ; Marcus, Andrew ; Kang, Dae Wook ; Crowell, Michael D. ; Rittmann, Bruce ; Krajmalnik-Brown, Rosa. / Distinctive microbiomes and metabolites linked with weight loss after gastric bypass, but not gastric banding. In: ISME Journal. 2017 ; Vol. 11, No. 9. pp. 2047-2058.
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abstract = "Roux-en-Y gastric bypass (RYGB) and laparoscopic adjustable gastric banding (LAGB) are anatomically different bariatric operations. RYGB achieves greater weight loss compared with LAGB. Changes in the gut microbiome have been documented after RYGB, but not LAGB, and the microbial contribution to sustainable surgical weight loss warrants further evaluation. We hypothesized that RYGB imposes greater changes on the microbiota and its metabolism than LAGB, and that the altered microbiota may contribute to greater weight loss. Using multi-omic approaches, we analyzed fecal microbial community structure and metabolites of pre-bariatric surgery morbidly obese (PreB-Ob), normal weight (NW), post-RYGB, and post-LAGB participants. RYGB microbiomes were significantly different from those from NW, LAGB and PreB-Ob. Microbiome differences between RYGB and PreB-Ob populations were mirrored in their metabolomes. Diversity was higher in RYGB compared with LAGB, possibly because of an increase in the abundance of facultative anaerobic, bile-tolerant and acid-sensible microorganisms in the former. Possibly because of lower gastric acid exposure, phylotypes from the oral cavity, such as Escherichia, Veillonella and Streptococcus, were in greater abundance in the RYGB group, and their abundances positively correlated with percent excess weight loss. Many of these post-RYGB microorganisms are capable of amino-acid fermentation. Amino-acid and carbohydrate fermentation products - isovalerate, isobutyrate, butyrate and propionate - were prevalent in RYGB participants, but not in LAGB participants. RYGB resulted in greater alteration of the gut microbiome and metabolome than LAGB, and RYGB group exhibited unique microbiome composed of many amino-acid fermenters, compared with nonsurgical controls.",
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