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Lopes F, Wang A, Smyth D, Reyes JL, Doering A, Schenck LP, Beck P, Waterhouse C, McKay DM. The Src kinase Fyn is protective in acute chemical-induced colitis and promotes recovery from disease. J Leukoc Biol 2015; 97:1089-99. [PMID: 25877924 DOI: 10.1189/jlb.3a0814-405rr] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 03/07/2015] [Indexed: 01/08/2023] Open
Abstract
Despite progress in understanding enteric inflammation, current therapies, although effective in many patients with inflammatory bowel disease (IBD), have significant side-effects, and, in many patients, it is refractory to treatment. The Src kinase Fyn mediated IFN-γ-induced increased permeability in model epithelia, and so we hypothesized that inhibition of Fyn kinase would be anti-colitic. Mice [B6.129SF2/J wild-type (WT), Fyn KO, or chimeras] received 2.5% dextran sodium sulfate (DSS) or normal water for 10 d and were necropsied immediately or 3 d later. Gut permeability was assessed by FITC-dextran flux, colitis by macroscopic and histologic parameters, and immune cell status by cytokine production and CD4(+) T cell Foxp3 expression. Fyn KO mice consistently displayed significantly worse DSS-induced disease than WT, correlating with decreased IL-10 and increased IL-17 in splenocytes and the gut; Fyn KO mice failed to thrive after removal of the DSS water. Analysis of chimeric mice indicated that the increased sensitivity to DSS was due to the lack of Fyn kinase in hematopoietic, but not stromal, cells, in accordance with Fyn(+) T cell increases in WT mice exposed to DSS and Fyn KO mice having a reduced number of CD4(+)Foxp3(+) cells in baseline or colitic conditions and a reduced capacity to induce Foxp3 expression in vitro. Other experiments suggest that the colonic microbiota in Fyn KO mice is not preferentially colitogenic. Contrary to our expectation, the absence of Fyn kinase resulted in greater DSS-induced disease, and analysis of chimeric mice indicated that leukocyte Fyn kinase is beneficial in limiting colitis.
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Affiliation(s)
- Fernando Lopes
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Arthur Wang
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - David Smyth
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Jose-Luis Reyes
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Axinia Doering
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - L Patrick Schenck
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Paul Beck
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Christopher Waterhouse
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Derek M McKay
- *Gastrointestinal Research Group and Inflammation Research Network, Department of Physiology and Pharmacology, Department of Medicine, Department of Paediatrics, Calvin, Joan and Phoebe Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Alberta, Canada
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Song KD, Hwang S, Yun CH. T cell receptor signaling that regulates the development of intrathymic natural regulatory T cells. Immune Netw 2011; 11:336-41. [PMID: 22346772 PMCID: PMC3275701 DOI: 10.4110/in.2011.11.6.336] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2011] [Revised: 11/25/2011] [Accepted: 12/06/2011] [Indexed: 01/01/2023] Open
Abstract
T cell receptor (TCR) signaling plays a critical role in T cell development, survival and differentiation. In the thymus, quantitative and/or qualitative differences in TCR signaling determine the fate of developing thymocytes and lead to positive and negative selection. Recently, it has been suggested that self-reactive T cells, escape from negative selection, should be suppressed in the periphery by regulatory T cells (Tregs) expressing Foxp3 transcription factor. Foxp3 is a master factor that is critical for not only development and survival but also suppressive activity of Treg. However, signals that determine Treg fate are not completely understood. The availability of mutant mice which harbor mutations in TCR signaling mediators will certainly allow to delineate signaling events that control intrathymic (natural) Treg (nTreg) development. Thus, we summarize the recent progress on the role of TCR signaling cascade components in nTreg development from the studies with murine model.
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Affiliation(s)
- Ki-Duk Song
- Center for Agricultural Biomaterials, Seoul National University, Seoul 151-921, Korea
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