Project description:Our previous work on the use of probiotics improved the clinical symptoms in irritable bowel syndrome with constipation-predominant. This study would like to explore further use of probiotics in the immune system of the patients with irritable bowel syndrome.
Project description:A role for immunoproteasome in the regulation of intestinal permeability has been previously suggested both in mice during water avoidance stress (WAS) and in patients with irritable bowel syndrome (IBS). We thus aimed (i) to evaluate the colonic proteome in wild-type (wt) and β2i immunoproteasome subunit knock-out (β2i-/-) mice during WAS and (ii) to investigate the colonic expression of 49 ubiquitinated-proteins in diarrhea-predominant IBS patients (IBS-D).
Project description:Opioid-dependent immune-mediated analgesic effects have been broadly reported upon inflammation. In preclinical mouse models of intestinal inflammatory diseases, the local release of enkephalins (endogenous opioids) by colitogenic T lymphocytes alleviate inflammationinduced pain by down-modulating gut-innervating nociceptor activation in periphery. In this study, we wondered whether this immune cell-derived enkephalin-mediated regulation of the nociceptor activity also operates under steady state conditions. Here, we show that chimeric mice engrafted with enkephalin-deficient bone marrow cells exhibit not only visceral hypersensitivity but also an increase in both epithelial paracellular and transcellular permeability, an alteration of the microbial topography resulting in increased bacteriaepithelium interactions and a higher frequency of IgA-producing plasma cells in Peyer’s patches. All these alterations of the intestinal homeostasis are associated with an anxiety-like behavior despite the absence of an overt inflammation as observed in patients with irritable bowel syndrome. Thus, our results show that immune cell-derived enkephalins play a pivotal role in maintaining gut homeostasis and normal behavior in mice. Because a defect in the mucosal opioid system remarkably mimics some major clinical symptoms of the irritable bowel syndrome, its identification might help to stratify subgroups of patients.
Project description:To explore the molecular mechanisms underlying Helicobacter pylori (Hp)-induced diarrhea-predominant irritable bowel syndrome (IBS-D), C57BL/6 mice were allocated into normal control (NC), Hp-infected, and succinate-treated (SA) groups. Alterations in colonic motility and visceral hypersensitivity were then assessed. Comparative RNA-sequencing (RNA-seq) of colonic tissues was performed to identify differentially expressed genes and elucidate the downstream molecular effectors mediating luminal succinate-driven dysmotility
2026-09-03 | GSE338699 | GEO
Project description:Gut microbiota in mice with damp-heat diarrhea-predominant irritable bowel syndrome
Project description:IBS: Patients who have undergone a diagnostic program for gastrointestinal symptoms and where the diagnosis irritable bowel syndrome was reached. UC: Patients with well-diagnosed ulcerative colitis
Project description:We have employed a single cell sequencing approach using 10x Genomics scRNAseq to study isolated endothelial cells, immune cells and stromal cells from the intestinal mucosa of the control group and diarrhea-predominant irritable bowel syndrome (IBS-D) rats. This study systematically deciphered the transcriptional landscape of the colonic mucosa in a rat model of IBS-D at single-cell resolution, revealing compositional shifts, transcriptional signatures, and potential regulatory networks among various cellular subpopulations, including epithelial, immune, and stromal cells.
Project description:Enterotoxigenic Escherichia coli (ETEC) is a major cause of diarrhoea in children in resource-limited countries and of travellers diarrhoea. The ileal proteomics change after ETEC challenge is less characterised. Here in this study changes of ileal proteins post ETEC challenge in weaned pigs are studied. In total, 5151 ileal proteins were successfully annotated and 9 proteins had significantly different abundance between the ETEC and CON pigs.
