Ontology highlight
ABSTRACT:
PROVIDER: PRJNA588805 | ENA |
REPOSITORIES: ENA
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Project description:Obesity is associated with multiple diseases. Bariatric surgery is the most effective therapy for severe obesity that can reduce body weight and obesity-associated morbidity. The metabolic alterations associated with obesity and respective changes after bariatric surgery are incompletely understood.We comprehensively assessed metabolic alterations associated with severe obesity and distinct bariatric procedures. In our longitudinal observational study, we applied a (1)H-nuclear magnetic resonance-based global, untargeted metabolomics strategy on human serum samples that were collected before and repeatedly <=1 y after distinct bariatric procedures [i.e., a sleeve gastrectomy, proximal Roux-en Y gastric bypass (RYGB), and distal RYGB]. For comparison, we also analyzed serum samples from normal-weight and less-obese subjects who were matched for 1-y postoperative body mass index (BMI) values of the surgical groups. We identified a metabolomic fingerprint in obese subjects that was clearly discriminated from that of normal-weight subjects. Furthermore, we showed that bariatric surgery (sleeve gastrectomy and proximal and distal RYGB) dynamically affected this fingerprint in a procedure-dependent manner, thereby establishing new fingerprints that could be discriminated from those of BMI-matched and normal-weight control subjects. Metabolites that largely contributed to the metabolomic fingerprints of severe obesity were aromatic and branched-chain amino acids (elevated), metabolites related to energy metabolism (pyruvate and citrate; elevated), and metabolites suggested to be derived from gut microbiota (formate, methanol, and isopropanol; all elevated). Our data indicate that bariatric surgery, irrespective of the specific kind of procedure used, reverses most of the metabolic alterations associated with obesity and suggest profound changes in gut microbiome-host interactions after the surgery. This trial was registered at clinicaltrials.gov as NCT02480322.
2017-02-10 | MTBLS242 | MetaboLights
Project description:Projection of gut microbiome pre and post bariatric surgery to predict surgery outcome
| PRJEB39382 | ENA
Project description:The gut microbiome is significantly altered in inflammatory bowel diseases, but the basis of these changes is not well understood. We have combined metagenomic and metatranscriptomic profiling of the gut microbiome to assess changes to both bacterial community structure and transcriptional activity in a mouse model of colitis. Gene families involved in microbial resistance to oxidative stress, including Dps/ferritin, Fe-dependent peroxidase and glutathione S-transferase, were transcriptionally up-regulated in colitis, implicating a role for increased oxygen tension in gut microbiota modulation. Transcriptional profiling of the host gut tissue and host RNA in the gut lumen revealed a marked increase in the transcription of genes with an activated macrophage and granulocyte signature, suggesting the involvement of these cell types in influencing microbial gene expression. Down-regulation of host glycosylation genes further supports a role for inflammation-driven changes to the gut niche that may impact the microbiome. We propose that members of the bacterial community react to inflammation-associated increased oxygen tension by inducing genes involved in oxidative stress resistance. Furthermore, correlated transcriptional responses between host glycosylation and bacterial glycan utilisation support a role for altered usage of host-derived carbohydrates in colitis. Complementary transcription profiling data from the mouse hosts have also been deposited at ArrayExpress under accession number E-MTAB-3590 ( http://www.ebi.ac.uk/arrayexpress/experiments/E-MTAB-3590/ ).
2015-05-22 | E-MTAB-3562 | biostudies-arrayexpress
Project description:To investigate the effects of bariatric surgery on gene expression profile changes in whole blood in obese subjects with type 2 diabetes in a pilot study setting. Whole blood from eleven obese subjects with type 2 diabetes was collected in PAXgene tubes prior to and 6-12 months after bariatric surgery. Total RNA was isolated, amplified, labeled and hybridized to Illumina gene expression microarrays. Clinical and expression data were analyzed using a paired t-test, and correlations between changes in clinical trait and transcript levels were calculated. Pathways were identified using Ingenuity Pathway Analysis and DAVID gene ontology software. Bariatric surgery resulted in significant reduction of BMI, fasting plasma glucose and normalization of HbA1c levels. The expression levels of 204 transcripts, representing 200 unique genes, were significantly altered after bariatric surgery. Among the significantly regulated genes were GGT1, CAMP, DEFA1, LCN2, TP53, ZNF684, GPR50, PDSS1, OLR1, CNTNAP5, DHCR24, HHAT and SARDH, which have been previously implicated in lipid metabolism, obesity and/or type 2 diabetes. The changes in expression of seven transcripts, WDR35, FLF45244, DHCR24, TIGD7, TOPBP1, TSHZ1, and FAM8A1 were strongly correlated with the changes in body weight, fasting plasma glucose and HbA1c content. These preliminary data suggest that whole blood expression levels of specific transcripts may identify biomarkers associated with susceptibility for type 2 diabetes and/or therapeutic response. Trasncriptome profiling was performed on eleven obese subjects with type 2 diabetes, (5 females and 6 males) to compare expression changes before and 6 to 12 months after the subjects underwent bariatric surgery.
2011-01-06 | E-GEOD-19790 | biostudies-arrayexpress
Project description:Evaluate differences in gene methylation levels between offspring born after maternal bariatric surgery and their siblings born before surgery Offspring born after maternal bariatric surgery (AMS, N=25) vs. offspring born before maternal surgery (BMS, N=25)
2013-05-16 | E-GEOD-44798 | biostudies-arrayexpress
Project description:Evaluate differences in gene expression levels between offspring born after maternal bariatric surgery and their siblings born before surgery Offspring born after maternal bariatric surgery (AMS, N=23) vs. offspring born before maternal surgery (BMS, N=23)
2013-05-16 | E-GEOD-44407 | biostudies-arrayexpress
Project description:Transcriptional profiling of subcutaneous adipose tissue before and after 2 years of bariatric surgery. This type of surgery produce a masive weight loss in morbidly obese subjects, and improve the comorbidities associated to obesity. Goal was to determine the effects of bariatric surgery on the gene expression of subcutaneous adipose tissue.
2017-03-16 | GSE66921 | GEO