Search results for "HLA-DR Antigens"

showing 10 items of 56 documents

Effect of colorectal cancer-derived extracellular vesicles on the immunophenotype and cytokine secretion profile of monocytes and macrophages.

2018

Abstract. Background Macrophages are one of the most important players in the tumor microenvironment. The polarization status of tumor associated macrophages into a pro-inflammatory type M1 or anti-inflammatory type M2 may influence cancer progression and patient survival. Extracellular vesicles (EVs) are membrane-bound vesicles containing different biomolecules that are involved in cell to cell signal transfer. Accumulating evidence suggests that cancer-derived EVs are taken up by macrophages and modulate their phenotype and cytokine profile. However, the interactions of cancer-derived EVs with monocytes and macrophages at various differentiation and polarization states are poorly understo…

0301 basic medicineDynaminsLipopolysaccharidesCell SurvivalCD14Macrophage polarizationLipopolysaccharide ReceptorsShort Reportlcsh:MedicineReceptors Cell Surfacecolorectal cancerBiochemistryMonocytesImmunophenotyping03 medical and health sciencesExtracellular VesiclesInterferon-gamma0302 clinical medicineCell Line TumormedicineCXCL10MacrophageHumansendocytosisSecretionLectins C-Typelcsh:QH573-671Molecular BiologyTumor microenvironmentlcsh:CytologyChemistryMonocyteMacrophageslcsh:RCell DifferentiationCell BiologyHLA-DR AntigenscytokinesCell biology030104 developmental biologymedicine.anatomical_structureMannose-Binding Lectins030220 oncology & carcinogenesisTetradecanoylphorbol AcetateCytokine secretionChemokinesColorectal NeoplasmsMannose ReceptorCell communication and signaling : CCS
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Increased PD-1 Expression and Altered T Cell Repertoire Diversity Predict Mortality in Patients with Septic Shock: A Preliminary Study

2017

Sepsis causes impairment of innate and adaptive immunity by multiple mechanisms, including depletion of immune effector cells and T cell exhaustion. Although lymphocyte dysfunction is associated with increased mortality and potential reactivation of latent viral infection in patients with septic shock, the relation between viral reactivation and lymphocyte dysfunction is obscure. The objectives of this study were 1) to determine the relation of lymphocyte dysfunction to viral reactivation and mortality, and 2) to evaluate recovery of lymphocyte function during septic shock, including T cell receptor (TCR) diversity and the expression of programmed death 1 (PD-1). In 18 patients with septic …

0301 basic medicineMaleLymphocyteReceptor expressionProgrammed Cell Death 1 Receptorlcsh:MedicineCytomegalovirusGene ExpressionArtificial Gene Amplification and ExtensionPathology and Laboratory MedicineImmune ReceptorsBiochemistryPolymerase Chain ReactionMonocytesWhite Blood Cells0302 clinical medicineSpectrum Analysis TechniquesAnimal CellsT-Lymphocyte SubsetsMedicine and Health SciencesLymphocyteslcsh:ScienceAged 80 and overMultidisciplinaryImmune System ProteinsT CellsMiddle AgedAcquired immune systemFlow CytometryPrognosisShock Septicmedicine.anatomical_structurePhenotypeSpectrophotometryShock (circulatory)Cytomegalovirus InfectionsFemaleCytophotometrymedicine.symptomCellular TypesResearch ArticleSignal TransductionT cellImmune CellsImmunologyReceptors Antigen T-CellBiologyResearch and Analysis MethodsMicrobiologyImmunophenotypingSepsis03 medical and health sciencesImmune systemSigns and SymptomsDiagnostic MedicineSepsisVirologymedicineHumansMolecular Biology TechniquesMolecular BiologyAgedBlood CellsSeptic shocklcsh:RBiology and Life SciencesProteins030208 emergency & critical care medicineCell BiologyHLA-DR Antigensmedicine.diseaseViral ReplicationT Cell Receptors030104 developmental biologyCase-Control StudiesImmunologylcsh:QBiomarkersPLoS ONE
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A double-negative (IgD−CD27−) B cell population is increased in the peripheral blood of elderly people

2009

The T cell branch of the immune system has been extensively studied in the elderly and it is known that the elderly have impaired immune function, mainly due to the chronic antigenic load that ultimately causes shrinkage of the T cell repertoire and filling of the immunologic space with memory T cells. In the present paper, we describe the IgD(-)CD27(-) double-negative B cell population which (as we have recently described) is higher in the elderly. Most of these cells were IgG(+). Evaluation of the telomere length and expression of the ABCB1 transporter and anti-apoptotic molecule, Bcl2, shows that they have the markers of memory B cells. We also show that these cells do not act as antigen…

AdultAgingATP Binding Cassette Transporter Subfamily BT cellAntigens CD19B-Lymphocyte Subsetschemical and pharmacologic phenomenaYoung AdultB lymphocyte Immunosenescence IgD CD27 Elderly Immunologic memorymedicineHumansCytotoxic T cellATP Binding Cassette Transporter Subfamily B Member 1IL-2 receptorCD40 AntigensCD154Antigen-presenting cellCells CulturedAgedAged 80 and overSettore MED/04 - Patologia Generalebusiness.industryAge FactorsHLA-DR AntigensImmunoglobulin DMiddle AgedTelomereFlow CytometryAcquired immune systemTumor Necrosis Factor Receptor Superfamily Member 7B-1 cellKi-67 Antigenmedicine.anatomical_structureProto-Oncogene Proteins c-bcl-2ImmunologyB7-1 AntigenbusinessImmunologic MemoryCD80Developmental BiologyMechanisms of Ageing and Development
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Study of T-cell activation in Type I diabetic patients and pre-Type I diabetic subjects by cytometric analysis: Antigen expression defectin vitro

1993

In Type I diabetes the observation of a decreased release of interleukin-2 (IL-2) and soluble IL-2 receptors by means of stimulated lymphocytes in vitro indicates that a primary immunoregulatory defect may be involved. To confirm this hypothesis we investigated the T-cell activation trend, evaluating the surface expression of IL-2 receptor (CD25), transferrin (CD71), HLA class II (DR), and CD69 phenotypes after in vitro stimulation with phytohemagglutinin (PHA; 1 and 10 micrograms/ml) and concanavalin A (12.5 micrograms/ml) in six newly diagnosed Type I diabetics and six islet cell- and insulin autoantibody-positive first-degree relatives. As controls were studied six long-standing Type I d…

AdultAntigens Differentiation T-LymphocyteCD4-Positive T-LymphocytesMaleInterleukin 2medicine.medical_specialtyTime FactorsAdolescentCD3 ComplexCD8 AntigensT-Lymphocytesmedicine.medical_treatmentT cellImmunologyTransferrin receptorBiologyLymphocyte ActivationAntigenAntigens CDInternal medicineDiabetes mellitusReceptors TransferrinmedicineHumansImmunology and AllergyLectins C-TypeIL-2 receptorPhytohemagglutininsReceptorInsulinReceptors Interleukin-2HLA-DR Antigensmedicine.diseaseAntigens Differentiation B-LymphocyteKineticsDiabetes Mellitus Type 1Endocrinologymedicine.anatomical_structureInterleukin-2Femalemedicine.drugJournal of Clinical Immunology
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The extent of HLA-DR expression on HLA-DR+Tregs allows the identification of patients with clinically relevant borderline rejection

2013

Regulatory T cells (Tregs) were shown to be involved into the pathogenesis of acute rejection after transplantation. The suppressive activity of the total regulatory T cell pool depends on its percentage of highly suppressive HLA-DR(+) -Treg cells. Therefore, both the suppressive activity of the total Treg pool and the extent of HLA-DR expression of HLA-DR(+) -Tregs (MFI HLA-DR) were estimated in non transplanted volunteers, patients with end-stage renal failure (ESRF), healthy renal transplant patients with suspicion on rejection, due to sole histological Bord-R or sole acute renal failure (ARF), and patients with clinically relevant borderline rejection (Bord-R and ARF). Compared to patie…

AdultGraft RejectionMaleRegulatory T cellRisk AssessmentSensitivity and SpecificityT-Lymphocytes RegulatoryFlow cytometryCohort StudiesPathogenesisYoung AdultPredictive Value of TestsReference ValuesBiopsymedicineHLA-DRHumansSurvival rateAgedSubclinical infectionTransplantationmedicine.diagnostic_testbusiness.industryBiopsy NeedleForkhead Transcription FactorsHLA-DR AntigensMiddle AgedFlow CytometryImmunohistochemistryKidney TransplantationSurvival RateTransplantationTreatment Outcomemedicine.anatomical_structureROC CurveCase-Control StudiesImmunologyLinear ModelsKidney Failure ChronicFemalebusinessBiomarkersTransplant International
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DR(high+)CD45RA(-)-Tregs potentially affect the suppressive activity of the total Treg pool in renal transplant patients.

2011

Recent studies show that regulatory T cells (Tregs) play an essential role in tolerance induction after organ transplantation. In order to examine whether there are differences in the composition of the total CD4(+)CD127(low+/-)FoxP3(+)- Treg cell pool between stable transplant patients and patients with biopsy proven rejection (BPR), we compared the percentages and the functional activity of the different Treg cell subsets (DR(high+)CD45RA(-)-Tregs, DR(low+)CD45RA(-)-Tregs, DR(-)CD45RA(-)-Tregs, DR(-)CD45RA(+)-Tregs). All parameters were determined during the three different periods of time after transplantation (0-30 days, 31-1,000 days, >1,000 days). Among 156 transplant patients, 37 pat…

AdultGraft Rejectionmedicine.medical_specialtymedicine.drug_classClinical Research DesignImmune Cellslcsh:Medicinechemical and pharmacologic phenomenaMonoclonal antibodyT-Lymphocytes RegulatoryOrgan transplantationInterleukin-7 Receptor alpha SubunitYoung AdultT-Lymphocyte SubsetsBiopsymedicineHumanslcsh:ScienceKidney transplantationAgedKidneyMultidisciplinarymedicine.diagnostic_testbusiness.industrylcsh:RInterleukin-2 Receptor alpha Subunithemic and immune systemsForkhead Transcription FactorsHLA-DR AntigensMiddle AgedImmunologic Subspecialtiesmedicine.diseaseKidney TransplantationTransplant rejectionTransplantationTolerance inductionmedicine.anatomical_structureNephrologyImmunologyLeukocyte Common AntigensMedicinelcsh:QClinical ImmunologySurgerybusinessResearch ArticlePloS one
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Hepatitis B surface antigen presentation and HLA-DRB1*– lessons from twins and peptide binding studies

2005

Summary The aim of this study was to investigate the underlying mechanisms of the genetic association between certain HLA-DRB1* alleles and the immune response to HBsAg vaccination. Therefore, HBsAg peptide binding to HLA-DR molecules was measured in vitro by peptide binding ELISAs. Additionally, HBsAg-specific T cell reaction and cytokine profile of immune response were analysed ex vivo in ELISPOT assays and DR-restriction of T-cell proliferative responses was investigated with HBsAg specific T cell clones. In addition, we compared HBsAg specific T cell responses of 24 monozygotic and 3 dizygotic twin pairs after HBsAg vaccination. Our results showed that the peptide binding assays did not…

AdultHBsAgAdolescentT cellDizygotic twinMolecular Sequence DataImmunologyAntigen presentationAntibody AffinityTwinsMonozygotic twinEnzyme-Linked Immunosorbent AssayPeptide bindingLymphocyte ActivationMajor histocompatibility complexBinding CompetitiveClinical StudiesmedicineHLA-DRHumansImmunology and AllergyHepatitis B VaccinesAmino Acid SequenceCells CulturedAgedAntigen PresentationHepatitis B Surface Antigensbiologyvirus diseasesDendritic CellsHLA-DR AntigensMiddle AgedTh1 CellsVirologydigestive system diseasesmedicine.anatomical_structureImmunologybiology.proteinCytokinesHLA-DRB1 ChainsClinical and Experimental Immunology
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The influence of major histocompatibility complex class II genes and T-cell Vbeta repertoire on response to immunization with HBsAg.

1998

Nonresponsiveness to HBsAg vaccination is observed in 5-10% of vaccine recipients and is possibly caused by a defect in the T helper cell compartment. The immune response to HBsAg is influenced by genes of the major histocompatibility complex. We have investigated MHC class I and class II antigens in 53 adult responders and 73 nonresponders. Results obtained in this first study were tested in a second study with 56 responders and 62 nonresponders from an infant vaccination trial. In addition, the peripheral Vbeta-chain T-cell receptor repertoire was investigated using monoclonal antibodies and flow-cytometry in 26 adult responders and 38 nonresponders. As previously reported, nonresponsiven…

AdultHBsAgT cellReceptors Antigen T-Cell alpha-betaImmunologyGenes MHC Class IIMajor histocompatibility complexCohort StudiesImmune systemGene FrequencyMHC class ImedicineImmunology and AllergyHumansHepatitis B VaccinesAllelesDiphtheria-Tetanus-Pertussis VaccineHepatitis B Surface AntigensbiologyT-cell receptorInfantGeneral MedicineT helper cellHLA-DR AntigensVirologyVaccinationmedicine.anatomical_structureImmunologybiology.proteinImmunizationHLA-DRB1 ChainsHuman immunology
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HLA-DRB1*1301 AND *1302 protect against chronic hepatitis B

1997

Abstract Background/Aims: The outcome of acute hepatitis B infection may be influenced by host factors like the major histocompatibility complex (MHC). We have investigated MHC class I and class II antigens in patients with chronic hepatitis B compared to a healthy control population. To confirm the findings of this first study we performed a second study in a group of subjects who had spontaneously recovered from acute hepatitis B infection. Methods: Frequencies of MHC class I and class II antigens were analyzed in patients with chronic hepatitis B virus infection and in control subjects. MHC class I typing was done by standard microlymphocytotoxicity assays. DRB1 and DQA1 genotypes were d…

AdultHepatitis B virusRemission SpontaneousPopulationEnzyme-Linked Immunosorbent AssayMajor histocompatibility complexmedicine.disease_causePolymerase Chain ReactionHLA-DQ alpha-ChainsVirusHLA-DQ AntigensMHC class ImedicineHumansSerologic TestsProspective StudiesHepatitis B AntibodieseducationHLA-DRB1AllelesHepatitis B viruseducation.field_of_studyMHC class IIHepatitis B Surface AntigensHepatologybiologyHLA-DR AntigensHepatitis BVirologyChronic infectionImmunoglobulin GChronic DiseaseDNA ViralImmunologybiology.proteinHLA-DRB1 ChainsJournal of Hepatology
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Correlation of Clinical and Immunologic Parameters of the Inflammatory Activity of Pulmonary Sarcoidosis

1991

The evaluation of activation markers such as T4/T8 ratio and HLA-DR expression of lymphocytes of bronchoalveolar lavage (L-BAL) is an important clinical approach for the staging of sarcoidosis. However, it is not known to what extent this is paralleled by an exaggerated lymphocyte function. We investigated the dependence of L-BAL activation markers on the production of interleukin-2 (IL-2) by L-BAL and on the soluble IL-2 receptor serum level (sIL-2R) in 116 patients with sarcoidosis. In none of the combinations tested was a correlation between the two groups of parameters found; r less than 0.5, upper 90% confidence limit of r less than 0.8. Interestingly, IL-2 production is independent of…

AdultLung DiseasesMalePulmonary and Respiratory MedicineSystemic diseaseSarcoidosisT-LymphocytesLymphocyteCD4-CD8 RatioCD4-CD8 RatioEnzyme-Linked Immunosorbent AssayInflammationLymphocyte ActivationHumansMedicineReceptormedicine.diagnostic_testbusiness.industryRespiratory diseaseReceptors Interleukin-2HLA-DR Antigensrespiratory systemmedicine.diseaserespiratory tract diseasesBronchoalveolar lavagemedicine.anatomical_structureImmunologyInterleukin-2FemaleSarcoidosismedicine.symptombusinessBronchoalveolar Lavage FluidAmerican Review of Respiratory Disease
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