Background: Hepatitis B is an important infectious disease.  Since several years ago, mass vaccination against this viral infection has become as part of routine vaccination schedule of Iran.  However, some healthy neonates, children and adults fail to generate a protective antibody response after vaccination.Objectives: To investigate distribution of HLA class-I and class-II antigens in health...

HLA class I molecules are recognized by CTL that eliminate virally infected and malignantly transformed cells presenting foreign peptide-a process termed immunosurveillance. Many tumors have reduced levels of membrane HLA class I. Tumor cells with mutations that reduce HLA class I avoid immunosurveillance and continue to proliferate. As tobacco use can induce tumors, we examined the effect of t...

Background: The human leukocyte antigen (HLA) matching between organ donor and recipient is an acceptable strategy in clinical transplantation since 1964. However, in bone marrow transplantation, finding matched donors is often problematic. Thus new method for down regulation of HLA can be an alternative strategy to solve this problem. Objective: To examine the effect of serum starvation on HLA...

the association of hla and disease varies in different populations. we have . studied the association of hla class i in iranian psoriatic patients, in order to compare this association with other reports. fifty-one iranian patients with psoriasis were hla typed. the frequency of hla antigens in patients and patient subgroups, based on clinical patterns, age of onset, family history and provocat...

this study was performed to determine the genetic diversity of hla class i and ii alleles among two ethnic groups in southeastern iran. hla profiles were determined in 71 iranian populations (41 zaboli and 30 baloch). the frequencies of hla-a02 (p=0.017), -cw4 (p=0.003), and -dr8 (p=0.025) in the zaboli populations were significantly higher than that in baloch ethnic group. in contrast, the fre...

PURPOSE Lynch syndrome colorectal cancers often lose human leukocyte antigen (HLA) class I expression. The outgrowth of clones with immune evasive phenotypes is thought to be positively selected by the action of cytotoxic T cells that target HLA class I-positive cancer cells. To investigate this hypothesis, we related the type and density of tumor lymphocytic infiltrate in Lynch colorectal canc...

The human major histocompatibility complex (MHC) class II region is associated with genetic susceptibility to multiple sclerosis (MS). Roles for HLA class I loci have been supported in several case-control studies, but this methodology does not consider the known linkage disequilibrium (LD) between class I and II loci. In 1258 individuals from 294 MS families, we analysed class I and II interac...

HLA-B*13:01 is associated with dapsone (DDS)-induced hypersensitivity and it has been shown that CD4+ CD8+ T cells are activated by DDS its nitroso metabolite (DDS-NO). However, there a need to define the importance of HLA association in disease pathogenesis. Thus, DDS-NO-specific cell clones (TCC) were generated from hypersensitive patients expressing assessed for phenotype function, HLA-allel...

Purpose Antitumor T cells need expression of HLA class I molecules but can be inhibited by ligands such as programmed death ligand 1 (PD-L1). We determined expression and regulation of these molecules in human conjunctival melanoma (CM) samples, cell lines, and murine xenografts. Methods Immunofluorescence staining was performed to examine the expression of HLA-A, HLA-B/C, and β-2-microglobul...

The majority of >2000 HLA class I molecules can be clustered according to overlapping peptide binding specificities or motifs recognized by CD8(+) T cells. HLA class I motifs are classified based on the specificity of residues located in the P2 and the C-terminal positions of the peptide. However, it has been suggested that other positions might be relevant for peptide binding to HLA class I mo...