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Open AccessJournal ArticleDOI

Identification of a monoclonal antibody specific for a murine T3 polypeptide

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TLDR
Results identify T3-epsilon as a cell surface protein involved in the transduction of activation signals and can both activate and inhibit T-cell function.
Abstract
A monoclonal antibody (145-2C11) specific for the murine T3 complex was derived by immunizing Armenian hamsters with a murine cytolytic T-cell clone. The antibody is specific for a 25-kDa protein component (T3-epsilon) of the antigen-specific T-cell receptor. It reacts with all mature T cells and can both activate and inhibit T-cell function. These results identify T3-epsilon as a cell surface protein involved in the transduction of activation signals.

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Citations
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Immunologic self-tolerance maintained by activated T cells expressing IL-2 receptor alpha-chains (CD25). Breakdown of a single mechanism of self-tolerance causes various autoimmune diseases.

TL;DR: The authors showed that CD4+CD25+ cells contribute to maintaining self-tolerance by downregulating immune response to self and non-self Ags in an Ag-nonspecific manner, presumably at the T cell activation stage.
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Interleukin-10-deficient mice develop chronic enterocolitis

TL;DR: The results indicate that the bowel inflammation in the mutants originates from uncontrolled immune responses stimulated by enteric antigens and that IL-10 is an essential immunoregulator in the intestinal tract.
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Induced expression of PD-1, a novel member of the immunoglobulin gene superfamily, upon programmed cell death.

TL;DR: The results suggest that activation of the PD‐1 gene may be involved in the classical type of programmed cell death.
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Immunosuppression by Glucocorticoids: Inhibition of NF-κB Activity Through Induction of IκB Synthesis

TL;DR: It is shown that glucocorticoids are potent inhibitors of nuclear factor kappa B activation in mice and cultured cells, mediated by induction of the IκBα inhibitory protein, which traps activated NF-κB in inactive cytoplasmic complexes.
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B7/CD28 costimulation is essential for the homeostasis of the CD4+CD25+ immunoregulatory T cells that control autoimmune diabetes.

TL;DR: The results suggest that the CD28/ B7 costimulatory pathway is essential for the development and homeostasis of regulatory T cells that control spontaneous autoimmune diseases.
References
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Journal ArticleDOI

Identification of a putative second T-cell receptor.

TL;DR: Chemical crosslinking experiments reveal that these lymphocytes express novel T3-associated polypeptides, one of which appears to be the product of the Tγ gene.
Journal ArticleDOI

The Molecular Genetics of the T-Cell Antigen Receptor and T-Cell Antigen Recognition

TL;DR: The genes encoding the alpha and beta chain of the T-cell receptor and the gamma gene have been cloned, and their structure, organization, ontogeny of expression, pattern of rearrangement, and diversification are now generally understood.
Journal ArticleDOI

Transmembrane signalling by the T cell antigen receptor. Perturbation of the T3-antigen receptor complex generates inositol phosphates and releases calcium ions from intracellular stores.

TL;DR: Data indicate that, during activation, perturbation of the T3-antigen receptor complex generates inositol trisphosphate, which functions as an intracellular signal to release Ca2+ from intrACEllular stores, leading to increases in [Ca2+]i.
Journal Article

OKT3: a monoclonal anti-human T lymphocyte antibody with potent mitogenic properties.

TL;DR: The cell membrane determinant recognized by OKT3 could be described as a "T cell stimulation receptor" as this interaction can trigger mitogenesis, the mitogenecity of the lymphocytes is not solely dependent on cross-linking of these receptors.
Journal ArticleDOI

Expression of interleukin-2 receptors as a differentiation marker on intrathymic stem cells.

TL;DR: It is shown that 50% of Lyt-2−/L3T4− cells in the adult thymus express receptors for the polypeptide growth hormone interleukin-2 (IL-2)6 whereas other cells in that organ do not, and immunohistochemical localization studies on frozen sections indicate a disperse distribution of IL-2 receptor-positive cells in both the cortex and medulla.
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