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• W1906739144 endingPage "2889" @default.
• W1906739144 startingPage "2881" @default.
• W1906739144 abstract "Chronic exposure of mature T cells with specificity for self-Ags can lead to the induction of a nonfunctional state which is referred to as T cell anergy. It is unclear whether anergic T cells are destined for cell death and thereby harmless or whether they can contribute to the induction of autoimmunity and/or regulation of anti-self reactivity. We have begun to address this issue. In a recent study, we showed that a population of mature CD4-CD8- T cells that express a transgenic TCR specific for the Ld MHC class I molecule are rendered anergic in Ld-expressing mice. In this study, we show that this population of anergic T cells possess a lower activation threshold for the induction of CD25 and CD69 in response to stimulation by antigenic ligands. Furthermore, these anergic T cells undergo extensive proliferation when stimulated with a low-affinity ligand in the presence of an exogenous source of IL-2. Biochemical analysis of the early intracellular signaling events of these in vivo anergized T cells showed that they have a signaling defect at the level of ZAP-70 and linker for the activation of T cell (LAT) phosphorylation. They also exhibit a defect in mobilization of intracellular calcium in response to TCR signaling. However, these anergic T cells demonstrate no defect in SLP-76 phosphorylation and extracellular signal-regulated kinase 1/2 activation. These biochemical characteristics of the anergic T cells were associated with an elevated level of Fyn, but not Lck expression. The potential contributions of these anergic T cells in the induction and/or regulation of autoimmune responses are discussed." @default.
• W1906739144 created "2016-06-24" @default.
• W1906739144 creator A5016702641 @default.
• W1906739144 creator A5021851766 @default.
• W1906739144 creator A5062839687 @default.
• W1906739144 date "2000-03-15" @default.
• W1906739144 modified "2023-10-04" @default.
• W1906739144 title "A Population of In Vivo Anergized T Cells with a Lower Activation Threshold for the Induction of CD25 Exhibit Differential Requirements in Mobilization of Intracellular Calcium and Mitogen-Activated Protein Kinase Activation" @default.
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• W1906739144 doi "https://doi.org/10.4049/jimmunol.164.6.2881" @default.
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