IL-13R[alpha]1 Expression on [Beta]-Cell-Specific T Cells in NOD Mice

Immunotherapy using peptides from the [beta]-cell antigen GAD65 can preserve glucose homeostasis in diabetes-prone NOD mice; however, the precise mechanisms that arrest islet-reactive T cells remain unresolved. Our previous work revealed that a dominant GAD65 epitope contained two overlapping I-A(g7...

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Veröffentlicht in:Diabetes (New York, N.Y.) N.Y.), 2011-06, Vol.60 (6), p.1716
Hauptverfasser: Rasche, Sarah S, Phillips, Michele, McInerney, Marcia F, Sercarz, Eli E, Quinn, Anthony
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container_issue 6
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container_title Diabetes (New York, N.Y.)
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creator Rasche, Sarah S
Phillips, Michele
McInerney, Marcia F
Sercarz, Eli E
Quinn, Anthony
description Immunotherapy using peptides from the [beta]-cell antigen GAD65 can preserve glucose homeostasis in diabetes-prone NOD mice; however, the precise mechanisms that arrest islet-reactive T cells remain unresolved. Our previous work revealed that a dominant GAD65 epitope contained two overlapping I-A(g7)-restricted determinants, 524-538 and 530-543, with the former associated with amelioration of hyperglycemia. Here, we sought to discover whether p524-538-specific T cells could directly regulate islet-reactive T cells. Prediabetic NOD mice were used to determine the relationship between peptide p524-538-induced interleukin (IL)-13 and regulation of islet autoimmunity. Pancreatic lymph node (PLN) cells from mice at distinct stages of islet inflammation, peri-insulitis versus invasive insulitis, were harvested to establish the expression pattern of IL-13 receptor α1 (IL-13Rα1) on islet-associated T cells. Peptide p524-538 preferentially induced IL-13-producing T cells that antagonized the release of γ-interferon by spontaneously arising GAD65 autoimmunity, and recombinant human IL-13 inhibited proliferation of islet-reactive clonotypic T cells. A subset of CD4(+) T cells in NOD and NOD.BDC2.5 T cell receptor transgenic mice expressed functional IL-13Rα1, which induced phosphorylation of signal transducer and activator of transcription 6 in the presence of cognate cytokine. Notably, the number of IL-13Rα1(+) T cells was heightened in the PLN of young NOD mice when compared with older female counterparts with advanced insulitis. Immunization with p524-538 preserved IL-13Rα1 expression on PLN T cells. IL-13 may be important for regulating autoimmunity in the early stages of insulitis, and the loss of IL-13Rα1 on islet-reactive T cells may be a biomarker for fading regional immune regulation and progression to overt diabetes.
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subjects Cytokines
Diabetes
Enzymes
Flow cytometry
Hyperglycemia
Lymphatic system
Lymphocytes
Peptides
Research design
Spleen
T cell receptors
title IL-13R[alpha]1 Expression on [Beta]-Cell-Specific T Cells in NOD Mice
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