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ABSTRACT:
PROVIDER: PRJNA472839 | ENA |
REPOSITORIES: ENA
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Project description:To increase our knowledge of the effects of Fructo oligosaccharides (FOS) on the intestinal barrier function in rats, a controlled rat infection study was performed. Two groups of rats were adapted to a diet with or without FOS. mRNA was collected from the mucosa of the colon and changes in gene expression were assessed using an agilent rat whole genome microarray (G4131A Agilent Technologies). Results indicate that dietary FOS influences energy metabolism, which will most likely play a role in the effects of FOS on the intestinal barrier. Experiment Overall Design: In the present study, large-scale gene expression analysis was performed to reveal mechanistic details of FOS induced gene expression in vivo in the colon mucosa. Wistar rats were adapted to diets with or without FOS for 14 days. RNA was isolated from colonic mucosal scrapings. Agilent rat whole genome microarray containing 44290 60-mer spots, were used to study FOS induced gene expression changes in order to better understand the FOS induced effects on the intestinal barrier of rats.
2008-06-14 | E-GEOD-5943 | biostudies-arrayexpress
Project description:To increase our knowledge of the effects of Fructo oligosaccharides (FOS) on the intestinal barrier function in rats, a controlled rat infection study was performed. Two groups of rats (n=12 per group) were adapted to a diet with or without FOS. mRNA was collected from the mucosa of the cecum and changes in gene expression were assessed using an agilent rat whole genome microarray (G4131A Agilent Technologies). Results indicate that dietary FOS influences immune response and wound healing mechanisms, which will most likely affect the intestinal barrier. Experiment Overall Design: In the present study, large-scale gene expression analysis was performed to reveal mechanistic details of FOS induced gene expression in vivo in the cecum mucosa. Wistar rats were adapted to diets with (n=12) or without FOS (n=12) for 14 days. RNA was isolated from cecum mucosal scrapings, two RNA samples from the control group were ecluded based on poor quality of RNA. Agilent rat whole genome microarray containing 44290 60-mer spots, were used to study FOS induced gene expression changes in order to better understand the FOS induced effects on the intestinal barrier of rats.
2008-06-18 | E-GEOD-8587 | biostudies-arrayexpress
Project description:IBD is a complex autoimmune disease characterized by dysregulated interactions between host immune responses and microbiome at the intestinal epithelium interface. Here we identified shared protein alterations in intestinal epithelial differentiation and function between IBD and Citrobacter rodentium infected FVB mice. We discovered that prophylactic treatment with the mucosal healing therapy IL-22.Fc in the infected FVB mice reduced disease severity and rescued the mice from lethality. Notably, we observed an emergence of intermediate undifferentiated intestinal epithelial cells upon infection, with disrupted expression of the solute transporter machinery as well as components critical for intestinal barrier integrity. Multi-omics analyses revealed that with IL-22.Fc treatment several disease associated changes were prevented (including disruption of the solute transporter machinery), and proper physiological homeostatic functions of the intestine was restored. Taken together, we unveiled the disease relevance of the C. rodentium induced colitis model to IBD and demonstrated the protective role of the mucosal healing therapy IL-22.Fc in ameliorating the epithelial dysfunction.
2023-10-05 | PXD024688 | Pride
Project description:Background and Aims: We have shown in several controlled rat and human infection studies that dietary calcium improves intestinal resistance and strengthens the mucosal barrier. Reinforcement of gut barrier function is also relevant for inflammatory bowel disease (IBD). Therefore, we investigated the effect of supplemental calcium on spontaneous colitis development in HLA-B27 transgenic rats, an experimental animal model of IBD. Methods: HLA-B27 transgenic rats were fed a purified high-fat diet containing either a low or high calcium content (30 and 120 mmol CaHPO4/kg diet, respectively) for almost 7 weeks. Inert chromium ethylenediamine-tetraacetic acid (CrEDTA) was added to the diets to quantify intestinal permeability by measuring urinary CrEDTA excretion. Relative fecal dry-weight was determined to quantify diarrhea. Colonic inflammation was determined histologically, and by measuring mucosal interleukin-1β. In addition, colonic mucosal gene expression of individual rats was analyzed, using whole genome microarrays. Interesting results were verified by Q-PCR. Results: The high-calcium diet significantly prevented the increase in intestinal permeability and diarrhea with time in HLA-B27 rats developing colitis as compared to the low-calcium group. The histological colitis score and mucosal interleukin-1β levels were lower in high-calcium fed rats. Supplemental calcium prevented the colitis-induced increase in the expression of extracellular matrix remodeling genes (e.g. matrix metalloproteinases, procollagens and fibronectin), which was confirmed by Q-PCR. Conclusions: Dietary calcium inhibits colitis development in HLA-B27 transgenic rats. Calcium prevents the colitis-related increase in intestinal permeability, diminishes diarrhea, and lowers the inflammatory response in the mucosa, resulting in less extracellular matrix breakdown. Keywords: nutritional intervention
2009-07-17 | GSE11022 | GEO
Project description:Background and Aims: We have shown in several controlled rat and human infection studies that dietary calcium improves intestinal resistance and strengthens the mucosal barrier. Reinforcement of gut barrier function is also relevant for inflammatory bowel disease (IBD). Therefore, we investigated the effect of supplemental calcium on spontaneous colitis development in HLA-B27 transgenic rats, an experimental animal model of IBD. Methods: HLA-B27 transgenic rats were fed a purified high-fat diet containing either a low or high calcium content (30 and 120 mmol CaHPO4/kg diet, respectively) for almost 7 weeks. Inert chromium ethylenediamine-tetraacetic acid (CrEDTA) was added to the diets to quantify intestinal permeability by measuring urinary CrEDTA excretion. Relative fecal dry-weight was determined to quantify diarrhea. Colonic inflammation was determined histologically, and by measuring mucosal interleukin-1M-NM-2. In addition, colonic mucosal gene expression of individual rats was analyzed, using whole genome microarrays. Interesting results were verified by Q-PCR. Results: The high-calcium diet significantly prevented the increase in intestinal permeability and diarrhea with time in HLA-B27 rats developing colitis as compared to the low-calcium group. The histological colitis score and mucosal interleukin-1M-NM-2 levels were lower in high-calcium fed rats. Supplemental calcium prevented the colitis-induced increase in the expression of extracellular matrix remodeling genes (e.g. matrix metalloproteinases, procollagens and fibronectin), which was confirmed by Q-PCR. Conclusions: Dietary calcium inhibits colitis development in HLA-B27 transgenic rats. Calcium prevents the colitis-related increase in intestinal permeability, diminishes diarrhea, and lowers the inflammatory response in the mucosa, resulting in less extracellular matrix breakdown. Keywords: nutritional intervention Female HLA-B27/M-NM-22-microglobulin transgenic rats on an inbred Fisher 344 background (n=8 in experimental group and n=9 in control group) (Taconic Farms, Inc, Germantown, NY), 8-10 weeks old and with a mean body weight of 128 g at the start of the experiment, were housed individually in metabolic cages. Animals were kept in a temperature- and humidity-controlled environment and in a 12-h light-dark cycle. Rats were fed a purified M-bM-^@M-^XhumanizedM-bM-^@M-^Y Western diet which contained in the control situation (per kg): 200 g acid casein, 326 g corn starch, 174 g glucose, 160 g palm oil, 40 g corn oil, 50 g cellulose and 5.16 g CaHPO4.2H2O (corresponding to 30 mmol calcium/kg diet; Sigma-Aldrich, St Louis, MO). Vitamins and minerals (other than calcium) were added to all diets according to the recommendations of the American Institute of Nutrition 1993.17 The experimental diet contained more calcium (120 mmol calcium/kg diet) at the expense of glucose. All samples were individually labelled and hybridized (Cy5). Equal amounts of Cy3 cRNA of all animals were pooled to serve as standard reference pool.
2009-07-16 | E-GEOD-11022 | biostudies-arrayexpress
Project description:Endocannabinoid 2-arachidonoylglycerol (2-AG) is an anti-nociceptive lipid that is inactivated through cellular uptake and subsequent catabolism by monoacylglycerol lipase (MAGL). In this study, we investigated the effects of MAGL inhibition on intestinal permeability and explored the possible mechanism. A rat model of severe acute pancreatitis (SAP) was established. Rats were divided into three groups according to treatment. We analyzed intestinal permeability to fluorescein isothiocyanate-dextran and the levels of inflammatory factors interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) and 2-AG. Hematoxylin and eosin staining was used to assess histological tissue changes. In vivo intestinal permeability was evaluated by transmission electron microscopy. We obtained ileum tissues, extracted total RNA, and applied RNA-sequencing. Sequencing data were analyzed by bioinformatics. Inflammatory factor levels were higher, while 2-AG levels were lower in the SAP group compared with the control group. Administration of JZL184 to rats with SAP increased the levels of 2-AG and lowered the levels of IL-6 and TNF-α. Notably, intestinal permeability was improved by JZL184 as demonstrated by fluorescein isothiocyanate-dextran measurement, hematoxylin and eosin staining, and transmission electron microscopy. RNA-sequencing showed significant transcriptional differences in SAP and JZL184 groups compared with the control group. KEGG analysis showed that the up- or downregulated genes in multiple comparison groups were enriched in two pathways, focal adhesion and PI3K-Akt signaling pathways. Differential alternative splicing (AS) genes, such as Myo9b, Lsp1, and Git2, have major functions in intestinal diseases. A total of 132 RNA-binding proteins (RBPs) were screened by crossing the identified abnormally expressed genes with the reported RBP genes. Among them, Hnrnpdl coexpressed the most AS events as the main RBP. MAGL inhibition improved intestinal mucosal barrier injury in SAP rats and induced a large number of differentially expressed genes and alternative splicing events. Hnrnpdl might play an important role in improving intestinal mucosal barrier injury by affecting alternative splicing events.
2022-03-18 | GSE197930 | GEO
Project description:Although hepatocyte-nuclear-factor-1α (Hnf1α) is crucial for pancreas and liver functions, it is believed to play a limited functional role for intestinal epithelial functions. The aim of this study was to assess the consequences of abrogating Hnf1α on the maintenance of adult small intestinal epithelial functions. Methodology/Principal Findings An Hnf1α knockout mouse model was used. Assessment of histological abnormalities, crypt epithelial cell proliferation, epithelial barrier, glucose transport and signalling pathways were measured in these animals. Changes in global gene expression were also analyzed. Mice lacking Hnf1α displayed increased crypt proliferation and intestinalomegaly as well as a disturbance of intestinal epithelial cell lineages production during adult life. This phenotype was associated with a decrease of the mucosal barrier function and lumen-to-blood glucose delivery. The mammalian target of rapamycin (mTOR) signalling pathway was found to be overly activated in the small intestine of adult Hnf1α mutant mice. The intestinal epithelium of Hnf1α null mice displayed a reduction of the enteroendocrine cell population. An impact was also observed on proper Paneth cell differentiation with abnormalities in the granule exocytosis pathway. Conclusions/Significance Together, these results unravel a functional role for Hnf1α in regulating adult intestinal growth and sustaining the functions of intestinal epithelial cell lineages. HNF1alpha was knocked out. A total of 3 control and 3 mutant littermate individuals were sacrificed at 4 months of age. The jejunum was harvested and total RNA was isolated from each individual. Each RNA sample was independently used to generate probes to screen Affymetrix chips.
2011-01-01 | E-GEOD-23040 | biostudies-arrayexpress
Project description:Acute superior mesenteric vein thrombosis (ASMVT) decreases the expression of junction-associated proteins and the number of intestinal epithelial cells, which leads to intestinal epithelial barrier disruption. Thermoprotein deposition has also recently been identified as an important cause of mucosal barrier defects. However, the role and mechanism of thermoprotein deposition in asmvt is not fully understood. Differentially expressed microRNAs (miRNAs) in the intestinal tissues of ASMVT mice were detected by transcriptome sequencing (RNA-Seq). To identify miRNAs involved in intestinal barrier disruption, we performed RNA-Seq analysis of intestinal tissues from ASMVT mice . Sixty miRNAs were abnormally expressed in normal intestinal tissues compared with ASMVT-induced intestinal tissues.
2024-01-25 | GSE240523 | GEO
Project description:Ischemic damage to the intestinal epithelial barrier, such as in necrotizing enterocolitis or small intestinal volvulus, is associated with higher mortality rates in younger patients. We have recently reported a powerful pig model to investigate these age-dependent outcomes in which mucosal barrier restitution is strikingly absent in neonates but can be rescued by direct application of homogenized mucosa from older, juvenile pigs by a yet-undefined mechanism. Within the mucosa, a postnatally developing network of enteric glial cells (EGC) is gaining recognition as a key regulator of the mucosal barrier. Therefore, we hypothesized that the developing EGC network may play an important role in coordinating intestinal barrier repair in neonates. Neonatal and juvenile jejunal mucosa recovering from surgically induced intestinal ischemia was visualized by scanning electron microscopy and the transcriptomic phenotypes were assessed by bulk RNA sequencing. EGC network development was examined by gene set enrichment analysis, three-dimensional volume imaging and western blot and its function in regulating epithelial restitution assessed ex vivo in Ussing chamber using the glia-specific inhibitor fluoroacetate, and in vivo in co-culture assays. Here we refine and elaborate our translational model, confirming a neonatal phenotype characterized by a complete lack of coordinated reparative signaling in the mucosal microenvironment. Further, we report important evidence that the subepithelial EGC network changes significantly over the early postnatal period and demonstrate that EGC function in close proximity to wounded intestinal epithelium is critical to intestinal barrier restitution following ischemic injury.
2022-09-08 | GSE212533 | GEO
Project description:Interventions: Colorectal cancer control group:no;Colorectal cancer probiotics group:No
Primary outcome(s): Intestinal flora metabolomics;Intestinal mucosal barrier;Inflammatory factors;Observation of clinical efficacy indicators;Intestinal flora
Study Design: Parallel
| 2759602 | ecrin-mdr-crc