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Effects of exercise training on skeletal muscle insulin sensitivity in obesity patients undergoing RYGB surgery: a randomized controlled trial

ABSTRACT: Effects of exercise training on skeletal muscle insulin sensitivity in obesity patients undergoing RYGB surgery: a randomized controlled trial

PROVIDER: PRJNA566111 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10136268.fastq.gz	Fastqsanger.gz
	SRR10136269.fastq.gz	Fastqsanger.gz
	SRR10136270.fastq.gz	Fastqsanger.gz
	SRR10136271.fastq.gz	Fastqsanger.gz
	SRR10136272.fastq.gz	Fastqsanger.gz

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Effects of exercise training on skeletal muscle insulin sensitivity in obesity patients undergoing RYGB surgery: a randomized controlled trial

Project description:We reported that skeletal muscle insulin sensitivity was restored to a lean phenotype with exercise training in patients undergoing RYGB surgery. For that, the goals of this study is to identify changes in the skeletal muscle transcriptome profiling (RNA-seq) that could explain the insulin sensitivity improvement of RYGB + exercise training group.

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Project description:Objective: Roux-Y gastric bypass (RYGB) surgery is a last treatment resort to induce substantial and sustained weight loss in severe obesity. The anatomical rearrangement affects the intestinal microbiota but so far, little information is available how it interferes with microbial functionality and microbial-host interaction independent from weight loss. Design: A RYGB rat model was utilized and compared to sham-operated controls which were kept at matched body weight as RYGB animals by food restriction. We assessed microbial taxonomy by 16S rRNA gene sequencing and functional activity by metaproteomics and metabolomics on microbiota samples collected separately from the ileum, the cecum as well as the colon and separately analysed the lumen and mucus associated microbiota. Results: Altered gut architecture in RYGB strongly affected the occurrence of Actinobacteria, especially Bifidobacteriaceae and Proteobacteria which were increased, whereas Firmicutes were decreased, although Streptococcaceae and Clostridium perfringens were observed at higher abundances. A decrease of conjugated as well as secondary bile acids was observed in the RYGB-gut lumen. In addition the arginine biosynthesis pathway in the microbiota was altered, indicated by the changes in abundance of upstream metabolites and enzymes, resulting in lower levels of arginine and higher levels of aspartate in the colon after RYGB. Conclusion: The anatomical rearrangement in RYGB affects microbiota composition and functionality by changes in amino acid and bile acid metabolism, independent of weight loss. The shift in microbiota taxonomic structure after RYGB may be mediated by the resulting change in composition of the bile acid pool in the gut lumen.

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Novel insights on remnant stomach following Roux-en-Y Gastric Bypass surgery based on histological evaluation and quantitative proteomics analysis

Project description:Background: Patients undergoing weight-reducing Roux-en-Y gastric bypass (RYGB) have immediate positive effects on metabolic health, including type 2 diabetes (T2D). Refeeding via the secluded stomach, either by a gastrotube or after gastro-gastric fistulation result in T2D relapse and weight regain. The stomach therefore seems to play an active role in metabolism. Objectives: To explore histological and protein expression changes in the gastric mucosa before compared to after RYGB. Methods: Perioperatively, biopsies were taken in a non-paired manner from the stomach (fundus, corpus, antrum) in patients undergoing Sleeve Gastrectomy (SG) and patients >8 months postoperatively after RYGB by balloon-enteroscopy. The included SG and RYGB patients did not display any obvious mucosal or luminal pathology during surgery or the balloon-enteroscopies. The gastric biopsies both at perioperatively and postoperatively were prepared för histological evaluation and for quantitative (comparative) non-targeted proteomics. The results were compared by Volcano plots, Principal Component Analysis and STRING functional protein association networks. Results: Histologically the gastric mucosa looked normal in biopsies from all the different parts of the postoperative bypassed stomach with no clear differences compared to the perioperative samples. The perioperative biopsies generally contained significantly higher amounts of proteins involved in fatty acid metabolism, oxidative phosphorylation and ATP metabolic processes, citric acid cycle and the respiratory chain. Postoperative biopsies instead showed overall increased quantities of proteins associated with ribosomes, RNA-metabolic processes, the mitotic cycle and pancreatic secretion. Conclusions: The results provide novel insights into the mucosal proteome-changes in the secluded stomach following RYGB.

2025-07-17 | PXD065508 | Pride

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