0000000000069663

AUTHOR

Nina Ullrich

showing 4 related works from this author

miR-155 inhibition sensitizes CD4+ Th cells for TREG mediated suppression.

2009

BackgroundIn humans and mice naturally occurring CD4(+)CD25(+) regulatory T cells (nTregs) are a thymus-derived subset of T cells, crucial for the maintenance of peripheral tolerance by controlling not only potentially autoreactive T cells but virtually all cells of the adaptive and innate immune system. Recent work using Dicer-deficient mice irrevocably demonstrated the importance of miRNAs for nTreg cell-mediated tolerance.Principal findingsDNA-Microarray analyses of human as well as murine conventional CD4(+) Th cells and nTregs revealed a strong up-regulation of mature miR-155 (microRNA-155) upon activation in both populations. Studying miR-155 expression in FoxP3-deficient scurfy mice …

CD4-Positive T-LymphocytesScienceImmunology/ImmunomodulationBiologyModels BiologicalT-Lymphocytes RegulatoryImmune tolerancemiR-155MiceDownregulation and upregulationImmune ToleranceAnimalsHumansIL-2 receptorOligonucleotide Array Sequence AnalysisMultidisciplinaryInnate immune systemGenetics and Genomics/Functional GenomicsQInterleukin-2 Receptor alpha SubunitRPeripheral toleranceFOXP3Forkhead Transcription FactorsTransfectionImmunity InnateCell biologyUp-RegulationKineticsMicroRNAsImmunologyImmunology/Immune ResponseMedicineGenetics and Genomics/Genetics of the Immune SystemResearch ArticlePLoS ONE
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Characterizing the N-terminal processing motif of MHC class I ligands.

2008

Abstract Most peptide ligands presented by MHC class I molecules are the product of an intracellular pathway comprising protein breakdown in the cytosol, transport into the endoplasmic reticulum, and successive N-terminal trimming events. The efficiency of each of these processes depends on the amino acid sequence of the presented ligand and its precursors. Thus, relating the amino acid composition N-terminal of presented ligands to the sequence specificity of processes in the pathway gives insight into the usage of ligand precursors in vivo. Examining the amino acid composition upstream the true N terminus of MHC class I ligands, we demonstrate the existence of a distinct N-terminal proces…

Proteasome Endopeptidase ComplexImmunologyAmino Acid MotifsEndoplasmic ReticulumLigandsAminopeptidaseAminopeptidasesCell LineMiceCytosolCell Line TumorMHC class IImmunology and AllergyAnimalsHumansAmino Acid SequenceATP Binding Cassette Transporter Subfamily B Member 2Peptide sequenceAntigen PresentationbiologyLigandEndoplasmic reticulumHistocompatibility Antigens Class ITransporter associated with antigen processingPeptide FragmentsN-terminusBiochemistryProteasomebiology.proteinATP-Binding Cassette TransportersPeptidesHeLa CellsProtein BindingJournal of immunology (Baltimore, Md. : 1950)
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Inhibition of cAMP Degradation Improves Regulatory T Cell-Mediated Suppression

2009

Abstract Naturally occurring regulatory T cells (nTreg cells) are crucial for the maintenance of peripheral tolerance. We have previously shown that a key mechanism of their suppressive action is based on a contact-dependent transfer of cAMP from nTreg cells to responder T cells. Herein, we further elucidate the important role of cAMP for the suppressive properties of nTreg cells. Prevention of cAMP degradation by application of the phosphodiesterase 4 inhibitor rolipram led to strongly increased suppressive potency of nTreg cells for Th2 cells in vitro and in vivo. Detailed analyses revealed that rolipram caused, in the presence of nTreg cells, a synergistic increase of cAMP in responder T…

Lung DiseasesPhosphodiesterase InhibitorsRegulatory T cellImmunologyCellEnzyme-Linked Immunosorbent AssayMice TransgenicInflammationBiologyT-Lymphocytes RegulatoryFlow cytometryMiceTh2 CellsIn vivoCyclic AMPHypersensitivityImmune TolerancemedicineAnimalsImmunology and AllergyCells CulturedRoliprammedicine.diagnostic_testPeripheral toleranceFlow CytometryCoculture TechniquesIn vitroCyclic Nucleotide Phosphodiesterases Type 4Cell biologymedicine.anatomical_structureImmunologymedicine.symptomRoliprammedicine.drugThe Journal of Immunology
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Cyclic adenosine monophosphate and IL-10 coordinately contribute to nTreg cell-mediated suppression of dendritic cell activation

2010

In humans and mice naturally occurring regulatory T cells (nTregs) are crucial for the maintenance of peripheral tolerance by controlling not only potentially autoreactive T cells but virtually all cells of the adaptive and innate immune system. Here we show that co-culture of murine dendritic cells (DC) and nTregs results in an immediate increase of cAMP in DC, responsible for a rapid down-regulation of co-stimulatory molecules (CD80, CD86). In addition, the inhibitory surface molecule B7-H3 on DC is up-regulated. Subsequently, nTreg-derived IL-10 inhibits the cytokine production (IL-6, IL-12) of suppressed DC therewith preserving their silent phenotype. Hence, our data indicate that nTreg…

ImmunologyDown-RegulationCell CommunicationBiologyT-Lymphocytes RegulatoryImmune toleranceMiceImmune systemCyclic AMPImmune ToleranceAnimalsCD86Innate immune systemInterleukin-6Peripheral toleranceDendritic CellsDendritic cellInterleukin-12Coculture TechniquesInterleukin-10Cell biologyInterleukin 10B7-1 AntigenB7-2 AntigenCD80Signal TransductionCellular Immunology
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