期刊
BMC IMMUNOLOGY
卷 15, 期 -, 页码 -出版社
BMC
DOI: 10.1186/1471-2172-15-6
关键词
Vitamin D receptor; CD8(+) T cells; Proliferation; Inflammatory bowel disease
类别
资金
- National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Diseases [DK070781]
- National Institutes of Neurologic and Stroke [NS067563]
- National Center for Complementary and Alternative Medicine
- Office of Dietary Supplements [AT005378]
Background: Vitamin D receptor (VDR) deficiency contributes to the development of experimental inflammatory bowel disease (IBD) in several different models. T cells have been shown to express the VDR, and T cells are targets of vitamin D. In this article we determined the effects of VDR expression on CD8(+) T cells. Results: VDR KO CD8(+) T cells, but not WT CD8(+) T cells, induced colitis in Rag KO recipients. In addition, co-transfer of VDR KO CD8(+) T cells with naive CD4(+) T cells accelerated colitis development. The more severe colitis was associated with rapidly proliferating naive VDR KO CD8(+) T cells and increased IFN-gamma and IL-17 in the gut. VDR KO CD8(+) T cells proliferated in vitro without antigen stimulation and did not downregulate CD62L and upregulate CD44 markers following proliferation that normally occurred in WT CD8(+) T cells. The increased proliferation of VDR KO CD8(+) cells was due in part to the higher production and response of the VDR KO cells to IL-2. Conclusions: Our data indicate that expression of the VDR is required to prevent replication of quiescent CD8(+) T cells. The inability to signal through the VDR resulted in the generation of pathogenic CD8(+) T cells from rapidly proliferating cells that contributed to the development of IBD.
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