0000000000312031

AUTHOR

Sebastian Kubsch

showing 3 related works from this author

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…

ImmunoconjugatesRegulatory T cellT-LymphocytesImmunologyApoptosisCell Cycle ProteinsAbataceptCyclin-dependent kinaseAntigens CDmedicineImmunology and AllergyHumansCTLA-4 AntigenIL-2 receptorClonal AnergybiologyTumor Suppressor ProteinsRetinoblastoma proteinDendritic cellDendritic CellsCell cycleAntigens DifferentiationCell biologyInterleukin-10Interleukin 10medicine.anatomical_structurebiology.proteinInterleukin-2CDK inhibitorCell DivisionCyclin-Dependent Kinase Inhibitor p27European journal of immunology
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CD4(+) and CD8(+) anergic T cells induced by interleukin-10-treated human dendritic cells display antigen-specific suppressor activity.

2002

Interleukin-10 (IL-10)–treated dendritic cells (DCs) induce an alloantigen- or peptide-specific anergy in various CD4+ and CD8+ T-cell populations. In the present study, we analyzed whether these anergic T cells are able to regulate antigen-specific immunity. Coculture experiments revealed that alloantigen-specific anergic CD4+ and CD8+ T cells suppressed proliferation of syngeneic T cells in a dose-dependent manner. The same effect was observed when the hemagglutinin-specific CD4+T-cell clone HA1.7 or tyrosinase-specific CD8+ T cells were cocultured with anergic T cells of the same specificity. Anergic T cells did not induce an antigen-independent bystander inhibition. Suppression was depe…

CD4-Positive T-LymphocytesIsoantigensImmunoconjugatesImmunologyAntigen-Presenting Cellschemical and pharmacologic phenomenaBiologyCD8-Positive T-LymphocytesLymphocyte ActivationBiochemistryT-Lymphocytes RegulatoryAbataceptInterleukin 21Antigens CDAntigens NeoplasmCytotoxic T cellHumansCTLA-4 AntigenIL-2 receptorLeukapheresisAntigen-presenting cellMelanomaCells CulturedClonal AnergyImmunosuppression TherapyMonophenol MonooxygenaseCD28Cell BiologyHematologyDendritic cellT lymphocyteDendritic CellsNatural killer T cellAntigens DifferentiationCoculture TechniquesCell biologyInterleukin-10ImmunologyCD4 AntigensLeukocytes MononuclearCell DivisionBlood
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Activation of MAP kinase p38 is critical for the cell-cycle–controlled suppressor function of regulatory T cells

2007

AbstractRegulatory T cells play an essential role in the control of self-tolerance and processes of adaptive immunity. Tolerogenic IL-10–modulated human dendritic cells (IL-10DCs) induce anergic T cells with strong suppressive properties (iTregs) that inhibit the activation of effector T cells. In this study, we evaluated the interaction between cell-cycle regulation and intracellular signaling in these iTregs. Analysis of signal transduction events revealed a down-regulation of the mitogen-activated protein kinases (MAPKs) Jun N-terminal kinase (JNK) and a nonactivation of extracellular-signal–regulated kinase (ERK) in contrast to a marked activation of p38 MAPK and the p38 effector MAPK-a…

MAPK/ERK pathwayp38 mitogen-activated protein kinasesImmunologyIn Vitro TechniquesProtein Serine-Threonine KinasesBiologyT-Lymphocytes Regulatoryp38 Mitogen-Activated Protein KinasesBiochemistryAldesleukinHumansProtein kinase AMitogen-Activated Protein Kinase KinasesKinaseCell CycleIntracellular Signaling Peptides and ProteinsJNK Mitogen-Activated Protein KinasesCell BiologyHematologyAcquired immune systemInterleukin-10Cell biologyMitogen-activated protein kinasebiology.proteinSignal transductionCyclin-Dependent Kinase Inhibitor p27Blood
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