Search results for "HLA-A Antigens"

showing 3 items of 23 documents

Antigen processing influences HIV-specific cytotoxic T lymphocyte immunodominance

2016

Udgivelsesdato: 2009-May-03 Although cytotoxic T lymphocytes (CTLs) in people infected with human immunodeficiency virus type 1 can potentially target multiple virus epitopes, the same few are recognized repeatedly. We show here that CTL immunodominance in regions of the human immunodeficiency virus type 1 group-associated antigen proteins p17 and p24 correlated with epitope abundance, which was strongly influenced by proteasomal digestion profiles, affinity for the transporter protein TAP, and trimming mediated by the endoplasmatic reticulum aminopeptidase ERAAP, and was moderately influenced by HLA affinity. Structural and functional analyses demonstrated that proteasomal cleavage 'prefer…

Models MolecularProteasome Endopeptidase ComplexHIV AntigensMolecular Sequence DataImmunologyAntigen presentationHIV Core Protein p24HIV InfectionsImmunodominanceMajor histocompatibility complexgag Gene Products Human Immunodeficiency VirusEpitopeEvolution MolecularMajor Histocompatibility ComplexLeucyl Aminopeptidase03 medical and health sciences0302 clinical medicineAntigenHumansImmunology and AllergyCytotoxic T cellAmino Acid Sequence030304 developmental biologyAntigen Presentation0303 health sciencesHLA-A AntigensbiologyImmunodominant EpitopesAntigen processingVirology3. Good healthCTL*MutationHIV-1biology.proteinATP-Binding Cassette TransportersProtein BindingT-Lymphocytes Cytotoxic030215 immunologyRETROVIROLOGY
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Features of TAP-independent MHC class I ligands revealed by quantitative mass spectrometry.

2008

TAP is responsible for transferring cytosolic peptides into the ER, where they can be loaded onto MHC molecules. Deletion of TAP results in a drastic reduction of MHC class I surface expression and alters the presented peptide pattern. This key molecule in antigen processing is tackled by several viruses and lost in some tumors, rendering the altered cells less vulnerable to T cell-based immune surveillance. Using the TAP-deficient cell line LCL721.174 and its TAP-expressing progenitor cell line LCL721.45, we identified and quantified more than 160 HLA ligands, 50 of which were presented TAP-independently. Peptides which were predominantly presented on the TAP-deficient LCL721.174 cell line…

Proteasome Endopeptidase ComplexImmunologyAntigen presentationEpitopes T-LymphocyteGene ExpressionHuman leukocyte antigenCysteine Proteinase InhibitorsProtein Sorting SignalsMajor histocompatibility complexCell LineAntigenATP Binding Cassette Transporter Subfamily B Member 3HLA AntigensTandem Mass SpectrometryMHC class IHLA-A2 AntigenImmunology and AllergyHumansAmino Acid SequenceATP Binding Cassette Transporter Subfamily B Member 2Antigen PresentationbiologyHLA-A AntigensAntigen processingHistocompatibility Antigens Class IProteinsTransporter associated with antigen processingMHC restrictionMolecular biologyPeptide FragmentsCell biologyHLA-B AntigensIsotope Labelingbiology.proteinATP-Binding Cassette TransportersProteasome InhibitorsGene DeletionProtein BindingEuropean journal of immunology
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Identification of HLA-A*0201-Restricted T Cell Epitopes Derived from the Novel Overexpressed Tumor Antigen Calcium-Activated Chloride Channel 2

2002

Abstract Vaccination against tumor Ags may become a promising treatment modality especially in cancer types where other therapeutic approaches fail. However, diversity of tumors requires that a multitude of Ags become available. Differential expression in normal vs cancerous tissues, both at the mRNA and the protein level, may identify Ag candidates. We have previously compared transcripts from squamous cell lung cancer and normal lung tissue using differential display analysis, and found a transcript that was overexpressed in malignant cells and was identical with the calcium-activated chloride channel 2 (CLCA2) gene. We have now selected HLA-A2-restricted peptides from CLCA2, and have gen…

T cellImmunologyAntigen presentationEpitopes T-LymphocyteStreptamerCD8-Positive T-LymphocytesBiologyEpitopeCell LineInterleukin 21AntigenAntigens NeoplasmChloride ChannelsHLA-A2 AntigenmedicineHumansImmunology and AllergyCytotoxic T cellAntigen-presenting cellAllelesAntigen PresentationHLA-A AntigensMolecular biologyCoculture TechniquesPeptide FragmentsPancreatic Neoplasmsmedicine.anatomical_structureCalciumOligopeptidesProtein BindingThe Journal of Immunology
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