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- W2172001037 abstract "Abstract Vitamin D and vitamin D receptor (VDR) deficiency results in severe symptoms of experimental inflammatory bowel disease in several different models. The intraepithelial lymphocytes of the small intestine contain large numbers of CD8αα+ T cells that have been shown to suppress the immune response to Ags found there. In this study, we determined the role of the VDR in the development of CD8αα+ T cells. There are fewer total numbers of TCRαβ+ T cells in the gut of VDR knockout (KO) mice, and that reduction was largely in the CD8αα+ TCRαβ+ cells. Conversely TCRγδ+ T cells were normal in the VDR KO mice. The thymic precursors of CD8αα+ TCRαβ+ cells (triple-positive for CD4, CD8αα, and CD8αβ) were reduced and less mature in VDR KO mice. In addition, VDR KO mice had a higher frequency of the CD8αα+ TCRαβ+ precursors (double-negative [DN] TCRαβ+ T cells) in the gut. The proliferation rates of the DN TCRαβ+ gut T cells were less in the VDR KO compared with those in wild type. Low proliferation of DN TCRαβ+ T cells was a result of the very low expression of the IL-15R in this population of cells in the absence of the VDR. Bone marrow transplantation showed that the defect in VDR KO CD8αα+ TCRαβ+ cells was cell intrinsic. Decreased maturation and proliferation of CD8αα+ TCRαβ+ cells in VDR KO mice results in fewer functional CD8αα+ TCRαβ+ T cells, which likely explains the increased inflammation in the gastrointestinal tract of VDR KO and vitamin D-deficient mice." @default.
- W2172001037 created "2016-06-24" @default.
- W2172001037 creator A5059431026 @default.
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- W2172001037 date "2011-03-01" @default.
- W2172001037 modified "2023-10-17" @default.
- W2172001037 title "Intrinsic Requirement for the Vitamin D Receptor in the Development of CD8αα-Expressing T Cells" @default.
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- W2172001037 doi "https://doi.org/10.4049/jimmunol.1003444" @default.
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