title: Dendritic cells bearing HLA-G inhibit T-Cell activation in type 1 diabetes.
abstract: HLA-G is normally expressed on human trophoblast cells. It is a non-classical MHC molecule class I b. The role of HLA-G in diabetic type 1 is not known. We investigated the role of IFN-beta in induction HLA-G expression on the monocyte derived dendritic cells (DC) in diabetes type 1. Treatment of dendritic cell with IFN-beta in vitro from diabetic patients (n=20) and normal subjects (n=20) resulted to the production and expression of HLA-G on these cells from both groups. However, comparison of DC from the diabetic patients with DC from the controls revealed lower levels of HLA-G molecules in DC from diabetic patients. Using mixed lymphocyte reaction (MLR), it was found that DC expressing HLA-G mediated the inhibition of autologous T cell activation. It is concluded that IFN-beta can increase HLA-G in DC from diabetic patients; subsequently it may prevent the immune regularly pathway in the diabetic pathogenesis.
authors.affiliation: Department of Pathobiology, Division of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Saeid
authors.initials: S
authors.lastname: Abediankenari
authors.forename: Mohammad Bagher
authors.initials: MB
authors.lastname: Eslami
authors.forename: Abdolfattah
authors.initials: A
authors.lastname: Sarrafnejad
authors.forename: Mehrnosh
authors.initials: M
authors.lastname: Mohseni
authors.forename: Bagher
authors.initials: B
authors.lastname: Larijani
mesh_terms: D000293:Adolescent; D000328:Adult; D003713:Dendritic Cells / Q000276:immunology*; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology*; D005260:Female; D006680:HLA Antigens / Q000502:physiology*; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I / Q000502:physiology*; D006801:Humans; D016899:Interferon-beta / Q000494:pharmacology; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006680:HLA Antigens; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I; D016899:Interferon-beta