| Autor: |
Sheikh IA; Daniel Cracchiolo Institute for Pediatric Autoimmune Disease Research, Steele Children's Research Center, Department of Pediatrics, University of Arizona, Tucson, AZ, USA., Bianchi-Smak J; Department of Biological Sciences, Rutgers University, Newark, NJ, USA., Laubitz D; Daniel Cracchiolo Institute for Pediatric Autoimmune Disease Research, Steele Children's Research Center, Department of Pediatrics, University of Arizona, Tucson, AZ, USA., Schiro G; Daniel Cracchiolo Institute for Pediatric Autoimmune Disease Research, Steele Children's Research Center, Department of Pediatrics, University of Arizona, Tucson, AZ, USA., Midura-Kiela MT; Daniel Cracchiolo Institute for Pediatric Autoimmune Disease Research, Steele Children's Research Center, Department of Pediatrics, University of Arizona, Tucson, AZ, USA., Besselsen DG; Pediatrics, University Animal Care, University of Arizona, Tucson, AZ, USA., Vedantam G; School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, AZ, USA., Jarmakiewicz S; Institute of Health Sciences, Medical College of Rzeszow, Rzeszow University, Rzeszow, Poland., Filip R; Institute of Medicine, Medical College of Rzeszow University, Rzeszow, Poland.; Department of Gastroenterology with IBD Unit, Clinical Hospital, Rzeszow, Poland., Ghishan FK; Daniel Cracchiolo Institute for Pediatric Autoimmune Disease Research, Steele Children's Research Center, Department of Pediatrics, University of Arizona, Tucson, AZ, USA., Gao N; Department of Biological Sciences, Rutgers University, Newark, NJ, USA., Kiela PR; Daniel Cracchiolo Institute for Pediatric Autoimmune Disease Research, Steele Children's Research Center, Department of Pediatrics, University of Arizona, Tucson, AZ, USA.; Department of Immunobiology, University of Arizona, Tucson, AZ, USA. |
| Abstrakt: |
Although the role of the intestinal microbiota in the pathogenesis of inflammatory bowel disease (IBD) is beyond debate, attempts to verify the causative role of IBD-associated dysbiosis have been limited to reports of promoting the disease in genetically susceptible mice or in chemically induced colitis. We aimed to further test the host response to fecal microbiome transplantation (FMT) from Crohn's disease patients on mucosal homeostasis in ex-germ-free (xGF) mice. We characterized and transferred fecal microbiota from healthy patients and patients with defined Crohn's ileocolitis (CD_L3) to germ-free mice and analyzed the resulting microbial and mucosal homeostasis by 16S profiling, shotgun metagenomics, histology, immunofluorescence (IF) and RNAseq analysis. We observed a markedly reduced engraftment of CD_L3 microbiome compared to healthy control microbiota. FMT from CD_L3 patients did not lead to ileitis but resulted in colitis with features consistent with CD: a discontinued pattern of colitis, more proximal colonic localization, enlarged isolated lymphoid follicles and/or tertiary lymphoid organ neogenesis, and a transcriptomic pattern consistent with epithelial reprograming and promotion of the Paneth cell-like signature in the proximal colon and immune dysregulation characteristic of CD. The observed inflammatory response was associated with persistently increased abundance of Ruminococcus gnavus, Erysipelatoclostridium ramosum, Faecalimonas umbilicate, Blautia hominis , Clostridium butyricum , and C. paraputrificum and unexpected growth of toxigenic C. difficile , which was below the detection level in the community used for inoculation. Our study provides the first evidence that the transfer of a dysbiotic community from CD patients can lead to spontaneous inflammatory changes in the colon of xGF mice and identifies a signature microbial community capable of promoting colonization of pathogenic and conditionally pathogenic bacteria. |
