Project description:Internal organs heal injuries with new connective tissue. However the cellular and molecular events, and the sources of this tissue, remain obscure. Here we tagged extracellular matrix around the mesothelium lining various mouse tissues: peritoneum, liver, and cecum, and applied various injury models. We discovered that preexisting matrix is transferred across organs into wounds. Using proteomics, genetic lineage-tracing and by selectively injuring juxtaposed organs, we demonstrate that the matrix tissue of origin likely dictates the final healing outcome: whether scarring or regeneration.
Project description:We investigated the effect of feeding mice a Total Western Diet formulated using the 50th percentile daily intake levels for macro and micronutrients from the National Health and Nutrition Examination Survey (NHANES) with 0, 2, 5, or 10% added raw potato starch on the cecal microbiome (16S) and cecum, proximal and distal colon gene expression by RNASeq analysis.
Project description:In the DSS-induced colitis model, the epithelial damage and resulting inflammation is restricted to the colon, with a potential influence on the microbial composition in the adjacent cecum. Several studies have reported changes of the gut microbiota in the DSS-induced colitis model and other mouse models of IBD. Furthermore, metaproteomics analysis of the gut microbiome in a mouse model of Crohn’s disease demonstrated that disease severity and location are microbiota-dependent, with clear evidence for the causal role of bacterial dysbiosis in the development of chronic ileal inflammation. We have developed a refined model of chronic DSS-induced colitis that reflects typical symptoms of human IBD without a risky body weight loss usually observed in DSS models [Hoffmann et al., submitted]. In this study, we used metaproteomics to characterize the disease-related changes in bacterial protein abundance and function in the refined model of DSS-induced colitis. To assess the structural and functional changes, we applied 16S rRNA gene sequencing and metaproteomics analysis of the intestinal microbiota in three different entities of the intestinal environment, i.e. colon mucus, colon content and cecum content.
Project description:SPF leghorn chickens were infected with C. jejuni. The cecum were collected at 8h post infection for total RNA isolation. The significantly expressed microRNAs between infected and non-infected chickens were identified through Solexa sequencing technology. Two libraries were made from each group, in total, four libraries were used for Solexa sequencing.
Project description:To understand the diversity of IELs in the gastrointestinal tract, CD45.2+ IELs from stomach, small intestine, cecum and colon of C57BL/6 mice were isolated for single cell RNA sequencing.
