RORgamma-expressing Th17 cells induce murine chronic intestinal inflammation via redundant effects of IL-17A and IL-17F - PubMed (original) (raw)
. 2009 Jan;136(1):257-67.
doi: 10.1053/j.gastro.2008.10.018. Epub 2008 Oct 9.
Christoph Becker, Ivaylo I Ivanov, Sebastian Hirth, Stefan Wirtz, Clemens Neufert, Sandrine Pouly, Andrew J Murphy, David M Valenzuela, George D Yancopoulos, Burkhard Becher, Dan R Littman, Markus F Neurath
Affiliations
- PMID: 18992745
- DOI: 10.1053/j.gastro.2008.10.018
RORgamma-expressing Th17 cells induce murine chronic intestinal inflammation via redundant effects of IL-17A and IL-17F
Moritz Leppkes et al. Gastroenterology. 2009 Jan.
Abstract
Background and aims: IL-17-producing CD4(+) T-helper cells (Th17) contribute to chronic autoimmune inflammation in the brain, and levels of Th17-derived cytokines increase in patients with colitis, suggesting a role in pathogenesis. We analyzed the roles of Th17 cells and the transcription factor retinoic acid receptor-related organ receptor (ROR)gamma, which regulates Th17 differentiation, in chronic intestinal inflammation.
Methods: Using an adoptive transfer model of colitis, we compared the colitogenic potential of wild-type, interleukin-17A (IL-17A)-, IL-17F-, IL-22-, and RORgamma-deficient CD4(+)CD25(-) T cells in RAG1-null mice.
Results: Adoptive transfer of IL-17A-, IL-17F-, or IL-22-deficient T lymphocytes into RAG1-null mice caused severe colitis that was indistinguishable from that caused by wild-type cells. In contrast, transfer of RORgamma-null T cells failed to increase mucosal IL-17 cytokine levels and did not induce colitis. Treatment with IL-17A was able to restore colitis after transfer of RORgamma-null T cells, indicating a crucial role for Th17 cells in pathogenesis. Treatment of RAG1 mice that received IL-17F-null (but not wild-type) T cells with a neutralizing anti-IL-17A antibody significantly suppressed disease, indicating redundant biological effects of IL-17A and IL-17F.
Conclusions: We have identified a crucial role of RORgamma-expressing Th17 cells in chronic intestinal inflammation. RORgamma controls IL-17A and IL-17F production, and these cytokines have a redundant but highly pathogenic role in gut inflammation. Reagents that target RORgamma or a combination of anti-IL-17A and anti-IL-17F might be developed as therapeutics for chronic colitis.
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