Search results for "Tetramers"

showing 7 items of 7 documents

Human CD8 T lymphocytes recognize Mycobacterium tuberculosis antigens presented by HLA-E during active tuberculosis and express type 2 cytokines

2015

CD8 T cells contribute to protective immunity against Mycobacterium tuberculosis. In humans, M. tuberculosis reactive CD8 T cells typically recognize peptides associated to classical MHC class Ia molecules, but little information is available on CD8 T cells recognizing M. tuberculosis Ags presented by nonclassical MHC class Ib molecules. We show here that CD8 T cells from tuberculosis (TB) patients recognize HLA-E-binding M. tuberculosis peptides in a CD3/TCR αβ mediated and CD8-dependent manner, and represent an additional type of effector cells playing a role in immune response to M. tuberculosis during active infection. HLA-E-restricted recognition of M. tuberculosis peptides is detectab…

MaleTetramersCytotoxicHLA-EReceptors Antigen T-Cell alpha-betaT-LymphocytesEpitopes T-LymphocyteHIV InfectionsMycobacterium tuberculosiEpitopesHLA-EReceptorsImmunology and AllergyCells CulturedType 2 cytokinealpha-betaCulturedbiologyCoinfectionType 2 cytokinesMedicine (all)BacterialMiddle AgedAcquired immune systemAntibodies Bacterialmedicine.anatomical_structureTBAntigenCytokinesFemaleNK Cell Lectin-Like Receptor Subfamily CNK Cell Lectin-Like Receptor Subfamily DCD8 T lymphocyteProtein BindingAdultTuberculosisSettore MED/17 - Malattie InfettiveT cellCellsImmunologyAntibodiesMycobacterium tuberculosisImmune systemAntigenMHC class ImedicineHumansTuberculosisAntigensSettore MED/04 - Patologia GeneraleAntigens BacterialCD8 T lymphocytes; HLA-E; Mycobacterium tuberculosis; TB; Tetramers; Type 2 cytokines; Adult; Antibodies Bacterial; Antigens Bacterial; Cells Cultured; Coinfection; Cytokines; Epitopes T-Lymphocyte; Female; HIV Infections; Histocompatibility Antigens Class I; Humans; Male; Middle Aged; Mycobacterium tuberculosis; NK Cell Lectin-Like Receptor Subfamily C; NK Cell Lectin-Like Receptor Subfamily D; Protein Binding; Receptors Antigen T-Cell alpha-beta; T-Lymphocytes Cytotoxic; Tuberculosis; Immunology; Immunology and Allergy; Medicine (all)Histocompatibility Antigens Class IMycobacterium tuberculosismedicine.diseasebiology.organism_classificationT-CellVirologyCD8 T lymphocytesT-LymphocyteImmunologybiology.proteinTetramerT-Lymphocytes CytotoxicCD8 T lymphocytes; HLA-E; Mycobacterium tuberculosis; TB; Tetramers; Type 2 cytokines; Immunology; Immunology and Allergy
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HLA-E-restricted CD8+ T lymphocytes as a new player in the adaptive immune response to Mycobacterium tuberculosis

Mycobacterium tuberculosis HLA-E tetramers CD8 T cells
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HLA-E-Restricted CD8+ T Lymphocytes Efficiently Control Mycobacterium tuberculosis and HIV-1 Co-Infection

2020

We investigated the contribution of human leukocyte antigen A2 (HLA-A2) and HLA-E-restricted CD8+ T cells in patients with Mycobacterium tuberculosis and human immunodeficiency virus 1 (HIV-1) coinfection. HIV-1 downregulates HLA-A, -B, and -C molecules in infected cells, thus influencing recognition by HLA class I-restricted CD8+ T cells but not by HLA-E-restricted CD8+ T cells, owing to the inability of the virus to downmodulate their expression. Therefore, antigen-specific HLA-E-restricted CD8+ T cells could play a protective role in Mycobacterium tuberculosis and HIV-1 coinfection. HLA-E- and HLA-A2-restricted Mycobacterium tuberculosis-specific CD8+ T cells were tested in vitro for cyt…

0301 basic medicinePulmonary and Respiratory MedicineAdultMaleTetramersTuberculosisHLA-EClinical BiochemistryT lymphocytesDown-RegulationHIV InfectionsHuman leukocyte antigenCD8-Positive T-Lymphocytes+Lymphocyte ActivationMycobacterium tuberculosis03 medical and health sciences0302 clinical medicineAntigenHLA-A2 AntigenmedicineCytotoxic T cellHumansTuberculosisLymphocyte CountMolecular BiologyAntigens BacterialbiologyCoinfectionHistocompatibility Antigens Class ICD8 T lymphocytes HLA-E Mycobacterium tuberculosis HIV tetramersCell BiologyCD8Mycobacterium tuberculosisMiddle Agedbiology.organism_classificationmedicine.diseaseVirology030104 developmental biology030228 respiratory systemCoinfectionHIV-1FemaleCD8Mycobacterium
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Analysis of the global CD8 T cell response during Mycobacterium tuberculosis infection

2013

Mycobacterium tuberculosisMycobacterium tuberculosis HLA-E tetramers Cytokines TB patients CD8 T cellsImmunologyImmunology and AllergyCytotoxic T cellBiologybiology.organism_classificationVirology
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A tetranuclear cubane-like nickel(II) complex with a tridentate salicylideneimine Schiff base ligand: tetrakis[μ3-4-methyl-N-(2-oxidophenyl)salicylid…

2016

The tetranuclear title complex, [Ni4(C14H11NO2)4(CH3OH)4]·0.8CH3OH, has a distorted cubane topology shaped by four Schiff base ligands. The cubane [Ni4(μ3-O4)] core is formedviathe O atoms from the Schiff base ligands. The octahedrally coordinated NiIIions occupy alternating vertices of the cube. Each NiIIion is coordinated by oneO,N,O′-tridentate dianionic ligand, two O atoms of oxidophenyl groups from adjacent ligands and the O atom of a coordinating methanol molecule. The cubane core is stabilizedviaan intramolecular O—H...O hydrogen bond between the hydroxy group of the coordinating methanol molecules and the phenolate O atom of the aldehyde Schiff base fragment. Additional stabilizatio…

crystal structureImineCrystal structure010402 general chemistry010403 inorganic & nuclear chemistryPhotochemistry01 natural sciencesAldehydeMedicinal chemistrychemistry.chemical_compoundGeneral Materials Sciencechemistry.chemical_classificationSchiff baseCrystallographybiologyHydrogen bondLigandcrystal structure ; nickel cubane-like tetra­mers ; Schiff bases.General ChemistryCondensed Matter Physicsbiology.organism_classification0104 chemical sciencesnickel cubane-like tetramerschemistryCubaneQD901-999TetraSchiff basesActa Crystallographica Section E: Crystallographic Communications
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Optimized Protocol for the Detection of Multifunctional Epitope-Specific CD4+ T Cells Combining MHC-II Tetramer and Intracellular Cytokine Staining T…

2019

Analysis of multifunctional CD4+ T cells is fundamental for characterizing the immune responses to vaccination or infection. Major histocompatibility complex (MHC)/peptide tetramers represent a powerful technology for the detection of antigen-specific T cells by specific binding to their T-cell receptor, and their combination with functional assays is fundamental for characterizing the antigen-specific immune response. Here we optimized a protocol for the detection of multiple intracellular cytokines within epitope-specific CD4+ T cells identified by the MHC class II tetramer technology. The optimal procedure for assessing the functional activity of tetramer-binding CD4+ T cells was based o…

CD4-Positive T-Lymphocyteslcsh:Immunologic diseases. Allergymedicine.medical_treatmentImmunologyEpitopes T-LymphocyteMajor histocompatibility complexEpitopeimmune responseMice03 medical and health sciences0302 clinical medicineImmune systemMHC-II tetramersTetramerMethodsmedicineAnimalsImmunology and Allergy030304 developmental biology0303 health sciencesMHC class IIMHC-II tetramers ICS cytokines multifunctional T cells flow cytometry immune response vaccinationStaining and LabelingbiologyChemistryflow cytometryHistocompatibility Antigens Class IIvaccinationmultifunctional T cellscytokines3. Good healthCell biologyCytokineICSbiology.proteinFemaleAntibodyPeptideslcsh:RC581-607Intracellular030215 immunologyFrontiers in Immunology
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Detailed characterization of human Mycobacterium tuberculosis specific HLA-E restricted CD8+T cells

2018

HLA-E presented antigens are interesting targets for vaccination given HLA-Es’ essentially monomorphic nature. We have shown previously that Mycobacterium tuberculosis (Mtb) peptides are presented by HLA-E to CD8+effector T cells, but the precise phenotype and functional capacity of these cells remains poorly characterized. We have developed and utilized in this study a new protocol combining HLA-E tetramer with intracellular staining for cytokines, transcription factors and cytotoxic molecules to characterize these cells in depth. We confirm in this study the significantly increased ex vivo frequency of Mtb-peptide/HLA-E-TM+CD8+T cells in the circulation of patients with active tubercu…

Cytotoxicity Immunologic0301 basic medicineTetramersImmunologyHuman leukocyte antigenCD8-Positive T-LymphocytesLymphocyte ActivationCD8+TÂ&nbspArticleImmunophenotypingMycobacterium tuberculosis03 medical and health sciencesTh2Th2 CellsAntigenHLA-A2 AntigenmedicineHumansTuberculosisCytotoxic T cellImmunology and AllergyGranulysinTuberculosis VaccinesCytokineCells CulturedConserved SequenceCell ProliferationAntigens BacterialbiologyLatent tuberculosisHistocompatibility Antigens Class IMycobacterium tuberculosisActive TBcellCD8(+) TcellsFlow Cytometrybiology.organism_classificationmedicine.disease3. Good health030104 developmental biologyPerforinImmunologybiology.proteinCytokinesPeptidesCD8Tetramer
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