Project description:C57BL/6 wild type mice were exposed to 12 Gy whole-body irradiation. Before irradiation (t=0) and at t=24, 48 and 96 hours after irradiation, mice (n=10 per time point) were euthanized. From n=5 mice per time point RNA was isolated from small-intestinal (jejunum) tissue, from n=5 mice per time point RNA was isolated from EDTA-isolated epithelial cells from small-intestinal tissue (jejunum).
Project description:Purpose: to investigate the effects of the cytokine Interluekin-22 (IL-22) on small intestinal epithelial cells, using organoids. Methods: WT or Apc(Min/Min) organoids (day 3) were stimulated with IL-22 (2ng/ml) for 3 hours, and submitted for transcriptomic profiling. Results: The main function of IL-22 in small intestinal epithelial cells is to activate an antimicrobial immune response and defence against infection and stress. Further, we found that loss of Apc lead to a complete loss of response to IL-22
Project description:The early interaction of Salmonella enterica serovar typhimurium DT104 with intact small intestinal mucosa was studied in a Small Intestinal Segment Perfusion (SISP) model. Intestinal segments were infected with or without Salmonella. Scrapings from jejunal segments were collected after perfusion for 0, 2, 4, or 8 hours. Details of the SISP experiment are described in: Niewold TA, Veldhuizen EJ, van der Meulen J, Haagsman HP, de Wit AA, Smits MA, Tersteeg MH, Hulst MM. Using the Operon 13K pig oligonucleotide array differences in host gene expression were recorded between infected and uninfected segments within a single pig (isogenic comparisons), and between identical treated segments collected from 3 individual SISP pigs, all responding markedly different to infection with Salmonella (inter-animal comparisons).
Project description:The intact intestinal epithelial barrier protects our body from a range of immune mediated diseases. The epithelial layer has an impressive ability to reconstitute and repair upon damage and this process of repair is increasingly seen as a therapeutic target. In vitro models to study this process in primary intestinal cells are lacking. Therefore we established and characterized an in vitro model of intestinal damage and repair by applying γ-radiation on small intestinal organoids. We then used this model to identify novel regulators of intestinal regeneration. Small intestinal single crypts were isolated from C57BL/6 mice and cultured in matrigel. We treated the organoid cultures, 3 days after seeding, with 6 Gy of gamma-irradiation. RNA was isolated at 24, 48 and 96 hours after irradiation. Non-irradiated controls were collected per time point.
Project description:Aeromonas caviae has been associated with human gastrointestinal disease. Strains of this species typically lack virulence factors (VFs) such as enterotoxins and hemolysins that are produced by other human pathogens of the Aeromonas genus. Microarray profiling of murine small intestinal extracts, 24 hours after oral infection with an A. caviae strain, provides evidence of a Th1 type immune response. A large number of gamma-interferon (γ-IFN) induced genes are up-regulated as well as several tumor necrosis factor-alpha (TNF-α) transcripts. A. caviae has always been considered an opportunistic pathogen because it lacks obvious virulence factors. This current effort suggests A. caviae colonizes murine intestinal tract and causes what has been described by others as a dysregulatory cytokine response leading to an irritable bowel-like syndrome. This response would explain why a number of diarrheal waterborne outbreaks have been attributed to A. caviae even though it lacks obvious enteropathogenic properties. Keywords: Aeromonas caviae, infection, disease mechanism, TH1 resposne
Project description:The intestinal epithelium is our first line of defense against infections of the gut and the plasticity in cellular differentiation of the intestinal epithelium is an important part of this response. Here we sequenced the small intestinal epithelium from mice infected with Nippostrongylus brasiliensis to determine how the intestinal epithelium adapts in the context of an infection. By comparing these data to small intestinal organoids treated with cytokines (see related accessions) we determine that the intestinal epithelial response to N. brasiliensis infection correspond to a type II infection driven by IL-13.
Project description:We sought to determine the transcriptomic impacts of artemisinin, Artemisia annua extract, and Artemisia afra extract on M. tuberculosis. Log phase cultures were treated with lethal doses for four hours or with inhibitory or sub-inhibitory doses for 24 hours. RNA was collected from untreated controls at the same timepoint.
Project description:To investigate the effect of stroke on the trasnscriptome of intestinal muscularis macrophages, mice underwent permanent middle cerebral artery occlusion (pMCAO) or sham surgery for 24 hours
Project description:To investigate the effect of stroke on the transcriptome of intestinal epithelial cells, mice underwent permanent middle cerebral artery occlusion (pMCAO) or sham surgery for 24 hours