The Role of the Intestinal Luminal Environment in Colitis
27th ECVIM-CA Congress, 2017
Kenneth W. Simpson
College of Veterinary Medicine, Cornell University, Ithaca, NY, USA

Keynote Message

Inflammatory bowel disease (IBD) reflects a spectrum of intestinal disorders, across species that are characterized by a dysregulated immune response to environmental and microbial antigens in genetically susceptible individuals. The interplay between the intestinal environment (chemical and microbial) and the host that leads to chronic inflammation is only beginning to be unraveled. It is emerging that inflammation in the absence of genetic susceptibility to IBD can trigger alterations in the enteric microbiome that can promote and perpetuate chronic inflammation and immune dysregulation in a susceptible individual. Genetic susceptibility impacts the threshold and magnitude of dysbiosis and inflammation, and mucosal healing. Concordant analysis of the microbiome and the metabolome has helped to identify bacteria and metabolic pathways that are adapted to utilize inflammation-associated substrates and promote inflammation. These discoveries provide unique opportunities for therapeutic intervention in the dysbiotic, inflamed gut.

Key References

1.  Craven M, Egan CE, Dowd SE, McDonough SP, Dogan B, Denkers EY, Bowman D, Scherl EJ, Simpson KW. Inflammation drives dysbiosis and bacterial invasion in murine models of ileal Crohn's disease. PLoS One. 2012;7(7):e41594. doi: 10.1371/journal.pone.0041594. Epub 2012 Jul 25.PMID:22848538.

2.  Lewis JD, Chen EZ, Baldassano RN, Otley AR, Griffiths AM, Lee D, Bittinger K, Bailey A, Friedman ES, Hoffmann C, Albenberg L, Sinha R, Compher C, Gilroy E, Nessel L, Grant A, Chehoud C, Li H, Wu GD, Bushman FD. Inflammation, antibiotics, and diet as environmental stressors of the gut microbiome in pediatric Crohn's disease. Cell Host Microbe. 2015;18(4):489–500. doi: 10.1016/j.chom.2015.09.008.PMID:26468751.

3.  Dogan B, Suzuki H, Herlekar D, Sartor RB, Campbell BJ, Roberts CL, Stewart K, Scherl EJ, Araz Y, Bitar PP, Lefébure T, Chandler B, Schukken YH, Stanhope MJ, Simpson KW. Inflammation-associated adherent-invasive Escherichia coli are enriched in pathways for use of propanediol and iron and M-cell translocation. Inflamm Bowel Dis. 2014;20(11):1919–32. doi:10.1097/MIB.0000000000000183.PMID:25230163.

4.  Viladomiu M, Kivolowitz C, Abdulhamid A, Dogan B, Victorio D, Castellanos JG, Woo V, Teng F, Tran NL, Sczesnak A, Chai C, Kim M, Diehl GE, Ajami NJ, Petrosino JF, Zhou XK, Schwartzman S, Mandl LA, Abramowitz M, Jacob V, Bosworth B, Steinlauf A, Scherl EJ, Wu HJ, Simpson KW, Longman RS. IgA-coated E. coli enriched in Crohn's disease spondyloarthritis promote TH17-dependent inflammation. Sci Transl Med. 2017;9(376). pii: eaaf9655. doi: 10.1126/scitranslmed.aaf9655.PMID:28179509.

  

Speaker Information
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Kenneth W. Simpson
College of Veterinary Medicine
Cornell University
Ithaca, NY, USA


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