Understanding changes to the molecular features of intestinal epithelial progenitors (IEPs) and their resident niche that occur in response to a variey of environmental and genetic insults will greatly enhance our knowledge of gut disease pathogenesis. For instance, what mechanisms result in the alteration of the normal controls for IEP proliferation during normal, physiologic wound healing? The goal of this application is to build on our findings that during colonic epithelial injury, the indigenous population of microbes in the gastro-intestinal tract activates macrophages through toll-like receptors (TLR) that in turn interact with colonic mesenchymal stem cells (cMSCs) that together interact with the overlying IEPs and stimulate proliferation and wound repair. cMSCs are important as they are a prominent source of prostaglandin-endoperoxide synthase 2 (Ptgs2). Two functional alleles of Ptgs2 were necessary for repair as wounds from Ptgs2-/- and Ptgs2+/- mice showed defects in the underlying muscularis propria and crypt regeneration. Ptgs2 mRNA was significantly induced in the wound bed at days two and four post-injury. Maximal Ptgs2 expression was observed in cMSCs. Therefore, we functionally screened mRNA binding proteins enriched in cMSCs for effects on Ptgs2 mRNA expression. We found the shRNA knockdown of Igf2bp1, a VICKZ mRNA binding protein and zip-code factor, led to a 5-fold decrease in Ptgs2 mRNA expression. We found that Igf2bp1 physically interacted with Ptgs2 mRNA, and Igf2bp1 expression was induced in cMSCs during repair with a time course similar to Ptgs2 induction. The goals of this proposal are to determine the mechanism of Igf2bp1 mRNA binding and the zip code function to Ptgs2. We will also determine the fate and role of cMSCs in colonic wound repair. This study will establish a basic for the role of Ptgs2 in cMSCs that could have implications for therapy of diseases such as inflammatory bowel disease that demonstrate poor healing.
The goal of this project is to determine the role of mesenchymal stem cells in colonic injury. The findings from these studies should impact our understanding of the pathogenesis of human diseases such as inflammatory bowel disease where wound healing is abnormal. In the longer term, we propose that these studies will provide the basis to develop cell-based therapeutics (using mesenchymal stem cells) for these diseases.
|Kaiko, Gerard E; Ryu, Stacy H; Koues, Olivia I et al. (2016) The Colonic Crypt Protects Stem Cells from Microbiota-Derived Metabolites. Cell 165:1708-20|
|Liu, Ta-Chiang; Stappenbeck, Thaddeus S (2016) Genetics and Pathogenesis of Inflammatory Bowel Disease. Annu Rev Pathol 11:127-48|
|Sun, Lulu; Miyoshi, Hiroyuki; Origanti, Sofia et al. (2015) Type I interferons link viral infection to enhanced epithelial turnover and repair. Cell Host Microbe 17:85-97|
|Moon, Clara; Baldridge, Megan T; Wallace, Meghan A et al. (2015) Vertically transmitted faecal IgA levels determine extra-chromosomal phenotypic variation. Nature 521:90-3|
|VanDussen, Kelli L; Marinshaw, Jeffrey M; Shaikh, Nurmohammad et al. (2015) Development of an enhanced human gastrointestinal epithelial culture system to facilitate patient-based assays. Gut 64:911-20|
|Avetisyan, Marina; Wang, Hongtao; Schill, Ellen Merrick et al. (2015) Hepatocyte Growth Factor and MET Support Mouse Enteric Nervous System Development, the Peristaltic Response, and Intestinal Epithelial Proliferation in Response to Injury. J Neurosci 35:11543-58|
|Moon, C; VanDussen, K L; Miyoshi, H et al. (2014) Development of a primary mouse intestinal epithelial cell monolayer culture system to evaluate factors that modulate IgA transcytosis. Mucosal Immunol 7:818-28|
|Steed, Ashley L; Stappenbeck, Thaddeus S (2014) Role of viruses and bacteria-virus interactions in autoimmunity. Curr Opin Immunol 31:102-7|
|Kaiko, Gerard E; Stappenbeck, Thaddeus S (2014) Host-microbe interactions shaping the gastrointestinal environment. Trends Immunol 35:538-48|
|Kuhn, Kristine A; Manieri, Nicholas A; Liu, Ta-Chiang et al. (2014) IL-6 stimulates intestinal epithelial proliferation and repair after injury. PLoS One 9:e114195|
Showing the most recent 10 out of 24 publications