RNAseq Analysis of Mouse Stomach and Intestines Following Vertical Sleeve Gastrectomy
ABSTRACT: Bariatric surgery, an effective treatment for obesity and diabetes, leads to profound remodeling of whole body energy homeostasis. We utilized a mouse model of vertical sleeve gastrectomy (VSG), a common bariatric surgery as a tool to identify novel secreted proteins and peptides that might act as important metabolic regulators. We analyzed gene expression in the stomach and intestines following VSG or sham surgery in diet-induced obese mice and sought to identify differentially regulated genes encoding secreted proteins/peptides. Overall design: Gene expression analysis of 5 different mouse intestinal tissues after VSG or sham surgery
Ghrelin, an appetite-stimulatory hormone secreted by the stomach, was discovered as a ligand for the growth hormone secretagogue receptor (GHSR). Through GHSR, ghrelin stimulates growth hormone (GH) secretion, a function that evolved to protect against starvation-induced hypoglycemia. Though the biology mediated by ghrelin has been described in great detail, regulation of ghrelin action is poorly understood. Here, we report the discovery of liver-expressed antimicrobial peptide 2 (LEAP2) as an e ...[more]
Project description:We report the expression profiles of ileal samples extracted from obese male C57Bl6 mice following vertical sleeve gastrectomy or sham surgery, focusing of gene signatures indicative of altered bile acid metabolism. We induced obesity in male C57bl6 mice through a high-fat diet. At 8 weeks, they were submitted to either a vertical sleeve gastrectomy (VSG) or a sham surgery; following surgery VSG mice were fed ad libitum while sham controls were pair-fed (SPF) to the experimental animals. During the four perioperative days, mice were fed a liquid Osmolite diet. Approximately 8 weeks after surgery mice were fasted overnight and gavaged with .5mL Osmolite; after one hour mice were sacrificed and the terminal ileum were extracted. RNA was extracted, quantified, and compared between VSG and SPF experimental groups.
Project description:We report here the transcriptome of sorted enteroendocrine cells from duodenum, ileum and colon from mice after vertical sleeve gastrectomy or sham operation, weight matched or not. We analyze the effect of region of origin and surgery and gene expression and found that only region of origin had an impact on EEC transcriptome Overall design: 3 conditions (VSG, sham-adlibitum and sham-weightmatched) from 3 regions (duodenum, ileum and colon) with 6 replicates for each
Project description:Vertical sleeve gastrectomy (VSG) produces sustainable weight loss, remission of type 2 diabetes (T2D), and improvement of nonalcoholic fatty liver disease (NAFLD). However, the molecular mechanisms underlying the metabolic benefits of VSG have remained elusive. We have previously demonstrated that diet-induced obesity leads to chromatin modifications in the liver of mice. We demonstrate here that VSG in C57BL/6J wild-type male mice can reverse these chromatin modifications and thereby impact the expression of key metabolic genes. Genes involved in lipid metabolism, especially omega-6 fatty acid metabolism, are up-regulated in livers of mice after VSG while genes in inflammatory pathways are down-regulated after VSG. Consistent with gene expression changes, regulatory regions near genes involved in inflammatory response displayed decreased chromatin accessibility after VSG. Our results indicate that VSG induces global regulatory changes that impact hepatic inflammatory and lipid metabolic pathways, providing new insight into the mechanisms underlying the beneficial metabolic effects induced by VSG. Overall design: Chromatin accessibility and transcriptome profiles of VSG, Sham and Control mice liver in duplicates.
Project description:In the present study, we sought to understand the impact of bariatric surgery [using vertical sleeve gastrectomy (VSG)] on transcriptome changes in the placenta . Female Adult, Long Evans were fed high fat diet (HFD, #D03082706, Research Diets) for 4 weeks, divided into sham-VSG or VSG groups, and following surgeries one group of sham-VSG and VSG were switched to normal diet (lean), while one sham-VSG group (obese) continued HFD. At gestdational day 18, placenta tissues harvested from pregnant female rats were processed for Affymetrix microarray and transcriptomic analysis performed. Overall design: Three groups of animals: lean sham-VSG (n=6), obese shame-VSG (n=6), and VSG (n=6)
Project description:Profiling of the murine peptidome along the gastrointestinal tract and pancreas in vertical sleeve gastrectomy and sham operated mice. The study compares the peptidome of various portions of the GI tract using intact mass spectrometry and database searching. These peptides included most gut hormones including proglucagon derived peptides, PYY, GIP, somatostatin, neurotensin amongst others.
Project description:We report here the transcriptome of a population enriched in enteroendocrine cells from human jejunum from patients before or after gastrectomy. We analyze the effect of surgery on gene expression and found very little effect on EEC transcriptome Overall design: 2 conditions: pre operative and post operative
Project description:We would like to examine the levels of amino acids in rats who have underwent bariatric (VSG, vertical sleeve gastrectomy) or sham (control) surgery. Plasma was collected after an overnight fast and once again after refeeding the rats for 2 hours.
Project description:The purpose of this study is to understand the effects of bariatric surgery on mammary carcinogenesis in C3 Tag (1) mouse model. My animals have gone through antibiotic treatments in drinking water vs. no abx in their water. Also animals have been though vertical sleeve gasteroctomy (VSG) vs sham surgery vs no surgery group. It is expected that these surgeries will affect the tumor proliferation and growth. One potential explanation can be the changes of SCFAs following the bariatric surgery.