Search results for "IL-2 receptor"

Anti-Inflammatory Action of Heterogeneous Nuclear Ribonucleoprotein A2/B1 in Patients with Autoimmune Endocrine Disorders

2019

Our previous studies documented that human fibroblast-limbal stem cells (f-LSCs) possess immunosuppressive capabilities, playing a role in regulating T-cell activity. This study highlights the molecular activities by which human f-LSCs can attenuate the inflammatory responses of self-reactive peripheral blood mononuclear cells (PBMCs) collected from patients with autoimmune endocrine diseases (AEDs). Anti-CD3 activated PBMCs from twenty healthy donors and fifty-two patients with AEDs were cocultured on f-LSC monolayer. 2D-DIGE proteomic experiments, mass spectrometry sequencing and functional in vitro assays were assessed in cocultured PBMCs. We identified the downmodulation of several huma…

From interleukin-9 to T helper 9 cells

2012

Abstract Interleukin-9 (IL-9), cloned more than 20 years ago, was initially thought to be a Th2-specific cytokine. This assumption was initially confirmed by functional analyses showing that both IL-9 and Th2 cells play an important role in the pathogenesis of asthma, IgE class switch recombination, and resolution of parasitic infections. However, recently it was shown that IL-9-producing CD4(+) T cells represent the discrete T helper subset Th9 cells. Herein, we will review the cytokines and transcription factors known to promote the development of Th9 cells and their potential functional properties in relation to the biological activities of IL-9. In addition, we will discuss how Th9 cell…

Constitutive and inducible protein/DNA interactions of the interferon-γ promoter inin vivo CD45RA and CD45RO T helper subsets

1997

Interferon-gamma (IFN-gamma) is a key cytokine of T lymphocytes with major regulatory functions in the immune system. To determine and compare protein/DNA interactions at the native IFN-gamma locus in T cells, we analyzed the human IFN-gamma promoter by ligation-mediated polymerase chain reaction (LM-PCR) techniques. Accordingly, Jurkat T cells and primary CD45RA and CD45R0 CD4+ T cell subsets isolated from peripheral blood using immunomagnetic beads were cultured and analyzed by LM-PCR. Constitutive and inducible protein/DNA interactions of the IFN-gamma promoter in vivo were detected in all T cells tested. Interestingly, an inducible footprint between -183 and -196 was consistently observ…

Cutting Edge: TGF-β Signaling Is Required for the In Vivo Expansion and Immunosuppressive Capacity of Regulatory CD4+CD25+ T Cells

2004

Abstract Data regarding the role of TGF-β for the in vivo function of regulatory CD4+CD25+ T cells (Treg) are controversial. A transgenic mouse model with impaired TGF-β signaling specifically in T cells was used to assess the role of endogenous TGF-β for the in vivo function of CD4+CD25+ Treg in a murine model of colitis induced by dextran sulfate. Transfer of wild-type, but not transgenic CD4+CD25+ Treg was found to suppress colitis in wild-type mice. In addition, by transferring CFSE-labeled CD4+CD25+ Treg we could demonstrate that endogenous TGF-β promotes the expansion of CD4+CD25+ Treg in vivo. Transgenic mice themselves developed reduced numbers of peripheral CD4+CD25+ Treg and were …

Hepatocellular expression of lymphocyte function—associated antigen 3 in chronic hepatitis

1991

T lymphocyte-mediated cytolytic immune reactions are considered a major cause of hepatocyte injury in chronic viral and autoimmune hepatitis. To further investigate local immune responses, we studied the expression of lymphocyte antigens and cell-cell interaction molecules known to be involved in effector-target cell interactions by light and electron microscopy in liver biopsy specimens from patients with chronic viral and autoimmune hepatitis. CD8+ lymphocytes were found to be the predominant population of cells in the inflammatory infiltrate in chronic hepatitis B and non-A, non-B hepatitis. In contrast, CD4+ cells constituted a comparably higher proportion of cells and were more numerou…

Human CD8+ memory and EBV-specific T cells show low alloreactivity in vitro and in CD34+ stem cell–engrafted NOD/SCID/IL-2Rγcnull mice

2013

Current strategies in cellular immunotherapy of cancer and viral infections include the adoptive transfer of T cell receptor (TCR) and chimeric antigen receptor engineered T cells. When using transient RNA expression systems in clinical studies, multiple infusions with receptor-redirected T cells appear necessary. However, in allogeneic hematopoietic stem-cell transplantation, repeated transfer of donor-derived T cells increases the risk of alloreactive graft-versus-host disease. We investigated naive-derived (T N ), memory-derived (T M ), and Epstein Barr virus-specific (T EBV ) CD8 + T cell subsets for alloreactivity upon redirection with RNA encoding a cytomegalovirus-specific model TCR.…

Allergen-specific immune deviation from a T H2 to a T H1 response induced by dendritic cells and collagen type I

1999

Background: Atopy and IgE production are associated with enhanced allergen-specific TH2 responses. Therefore a causative treatment may result from the deviation of this T H2dominated immune response toward a TH1 response. Objective: This study was carried out to analyze whether dendritic cells, the most potent antigen-presenting cells that are also known to induce antigen-specific T H1 responses, are suitable for therapy of atopic diseases by shifting the allergen-specific TH2 response toward a TH1 response. Methods: Monocyte-derived dendritic cells were used to present allergens in vitro to autologous CD4 + T cells of allergic persons. Because collagen type I activates dendritic cells and …

2004

Autoimmune inflammation, such as in rheumatoid arthritis, is characterized by activated Th1 cells without sufficient Th2 differentiation that might downmodulate the chronic immune response. Delineation of the mechanisms that control T-cell differentiation is therefore of major importance for the understanding of the pathogenesis of autoimmune diseases. The transcription factor GATA-3 has been implicated in regulating Th2 cell differentiation in murine T cells in vitro, but its role in vivo and, in particular, in human T-cell differentiation is currently unknown. To dissect the role of GATA-3 in human T-cell differentiation and T-cell-mediated effector functions, we used the unique opportuni…

Suppressor activity of anergic T cells induced by IL-10-treated human dendritic cells: association with IL-2- and CTLA-4-dependent G1 arrest of the c…

2003

We have previously shown that human IL-10-treated dendritic cells (DC) induce an antigen-specific anergy in CD4+ T lymphocytes. These anergic T cells are characterized by an inhibited proliferation, a reduced production of IL-2, and additionally display antigen-specific suppressor activity. In this study we investigated the mechanisms underlying the anergic state and regulatory function of these T cells. We did not observe enhanced rates of programmed cell death of anergic CD4+ suppressor T cells compared to T cells stimulated with mature DC. Cell cycle analysis by DNA staining and Western blot experiments revealed an arrest of anergic CD4+ T suppressor cells in the G1 phase. High levels of…

Tuning tumor-specific T-cell activation: a matter of costimulation?

2002

Abstract The stimulation of a specific antitumor immune response, involving the recruitment of T cells and induction of T-cell effector functions, is an attractive possibility for cancer immunotherapy. In the past few years, advances in our understanding of the mechanisms of T-cell activation and costimulation have provided the basis for strategies to enhance antitumor immunity and break tolerance. These strategies include the equipment of tumor cells with costimulatory molecules such as B7, blockade of inhibitory signals on T cells (e.g. through cytotoxic T-lymphocyte antigen 4) and grafting of T cells with antigen-triggered, recombinant costimulatory receptors. Combining antigen-triggered…