Reduction of colitis by prebiotics in HLA-B27 transgenic rats is associated with microflora changes and immunomodulation
Article first published online: 14 DEC 2006
Copyright © 2005 Crohn's & Colitis Foundation of America, Inc.
Inflammatory Bowel Diseases
Volume 11, Issue 11, pages 977–985, November 2005
How to Cite
Hoentjen, F., Welling, G. W., Harmsen, H. J. M., Zhang, X., Snart, J., Tannock, G. W., Lien, K., Churchill, T. A., Lupicki, M. and Dieleman, L. A. (2005), Reduction of colitis by prebiotics in HLA-B27 transgenic rats is associated with microflora changes and immunomodulation. Inflamm Bowel Dis, 11: 977–985. doi: 10.1097/01.MIB.0000183421.02316.d5
- Issue published online: 14 DEC 2006
- Article first published online: 14 DEC 2006
- Manuscript Accepted: 10 AUG 2005
- Manuscript Received: 1 AUG 2005
- commensal intestinal bacteria;
- HLA-B27 transgenic rats;
HLA-B27 transgenic rats develop spontaneous colitis under specific pathogen-free conditions (SPF) but germ-free rats remain disease-free, emphasizing a role for intestinal bacteria in the pathogenesis of chronic intestinal inflammation. Prebiotics are dietary substances that affect the host by stimulating growth and/or activity of potentially health promoting bacteria. The aims of this study were to investigate whether prebiotics can prevent colitis in SPF HLA-B27 rats, and secondly, to explore mechanisms of protection. SPF HLA-B27 transgenic rats received orally the prebiotic combination long-chain inulin and oligofructose (Synergy 1), or not, prior to the development of clinically detectable colitis. After seven weeks, cecal and colonic tissues were collected for gross cecal scores (GCS), histologic inflammatory scores (scale 0-4), and mucosal cytokine measurement. Cecal and colonic contents were collected for analysis of the gut microbiota by PCR-denaturing gradient gel electrophoresis (PCR-DGGE) and fluorescent in-situ hybridization (FISH), and analysis of short-chain fatty acid composition. Prebiotic treatment significantly decreased GCS and inflammatory histologic scores in the cecum and colon. Prebiotic treatment also decreased cecal IL-1β, but increased cecal TGF-β concentrations. Inulin/oligofructose altered the cecal and colonic PCR-DGGE profiles, and FISH analysis showed significant increases in cecal Lactobacillus and Bifidobacterium populations after prebiotic treatment compared with water-treated rats. In conclusion, the prebiotic combination Synergy 1 reduced colitis in HLA-B27 transgenic rats, which effect was associated with alterations to the gut microbiota, decreased tissue proinflammatory cytokines and increased immunomodulatory molecules. These results show promise for prebiotics as primary or adjuvant maintenance therapy for chronic inflammatory bowel diseases.