Search results for "MHC Class II Gene"

showing 3 items of 3 documents

Differential expression of alternative H2-M isoforms in B cells, dendritic cells and macrophages by proinflammatory cytokines.

1999

Major histocompatibility (MHC) class II heterodimers bind peptides generated by degradation of endocytosed antigens and display them on the surface of antigen presenting cells (APCs) for recognition by CD4+ T cells. Efficient loading of MHC class II molecules with peptides is catalyzed by the MHC class II-like molecule H2-M. The coordinate regulation of MHC class II and H2-M expression is a prerequisite for efficient MHC class II/peptide assembly in APCs determining both the generation of the T cell repertoire in the thymus and cellular immune responses in the periphery. Here we show that expression of H2-M and MHC class II genes is coordinately and cell type-specific regulated in splenic B…

CD74ImmunologyAntigen presentationGenes MHC Class IICD1Antigen-Presenting CellsGene ExpressionIn Vitro TechniquesMHC Class II GeneMiceMHC class IAnimalsProtein IsoformsMolecular BiologyDNA PrimersMHC class IIB-LymphocytesHLA-D AntigensMice Inbred BALB CbiologyBase SequenceAntigen processingHistocompatibility Antigens Class IIDendritic CellsMHC restrictionMolecular biologybiology.proteinMacrophages PeritonealCytokinesInflammation MediatorsMolecular immunology
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MHC class II genes influence the susceptibility to chronic active hepatitis C

1997

Chronic hepatitis C develops in more than 70% of hepatitis C virus infected subjects. Viral factors influence the disease course, but little is known about the importance of host factors.Frequencies of major histocompatibility complex (MHC) class I and class II antigens were analyzed in two groups of patients with chronic hepatitis C virus infection and in control subjects. MHC class I typing was done by standard microlymphocytotoxicity assays. DRB1 and DQA1 genotyping was done by PCR based typing methods.DRB1*0301 was found in 26 of 75 patients with chronic hepatitis C virus infection (34.7%) and in 12 of 101 control subjects (11.9%) (relative risk 3.9; p0.001). Homozygosity for this allel…

GenotypeHepatitis C virusGenes MHC Class IIBiologymedicine.disease_causePolymerase Chain ReactionHLA-DQ alpha-ChainsVirusMHC Class II GeneReference ValuesHLA-DQ AntigensMHC class ImedicineHumansGenetic Predisposition to DiseaseAllelesAntilymphocyte SerumHepatitis ChronicHepatitisMHC class IIHepatologyHistocompatibility Antigens Class IHomozygoteHistocompatibility Antigens Class IIHLA-DR AntigensHepatitis Cmedicine.diseaseHepatitis CVirologyHistocompatibilityImmunologyDisease Progressionbiology.proteinDisease SusceptibilityHLA-DRB1 ChainsJournal of Hepatology
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Toxoplasma gondii down-regulates MHC class II gene expression and antigen presentation by murine macrophages via interference with nuclear translocat…

2001

The obligate intracellular protozoan parasite Toxoplasma gondii is able to establish persistent infections within human and animal hosts. We have shown recently that T. gondii down-regulates IFN-γ-induced MHC class II expression in murine bone marrow-derived macrophages (BMMΦ). As shown in this study, the capacity of IFN-γ-activated murine BMMΦ to present ovalbumin to CD4+ T cell hybridomas was dose-dependently inhibited by T. gondii. IFN-γ-induced up-regulation of H2-Aa, H2-Ab, H2-Eb, H2-Ma, H2-Mb, H2-Oa and invariant chain transcripts was prominently down-regulated by T. gondii. Furthermore, mRNA levels of class II transactivator and interferon-regulatory factor-1 were significantly dimin…

MHC class IIbiologyT cellImmunologyAntigen presentationToxoplasma gondiibiology.organism_classificationMolecular biologyMHC Class II Genemedicine.anatomical_structureparasitic diseasesbiology.proteinSTAT proteinmedicineImmunology and AllergySTAT1Signal transductionEuropean Journal of Immunology
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