title: Constitutive expression of HLA class II mRNA in synovial fibroblast-like cells from patients with rheumatoid arthritis .
abstract: We describe the quantification of the absolute amounts of HLA class II mRNA and class II transactivator (CIITA) mRNA by competitive reverse transcription polymerase chain reaction in cultured synovial fibroblast-like cells (SFC) of patients with rheumatoid arthritis. High basal levels of transcription of class II mRNA (10(7)-10(9) molecules/microgram total RNA) and CIITA mRNA were detected in cultured SFC, with DPB < DRB = DQB, although SFC only express small amounts of MHC class II proteins. In contrast to SFC, we did not detect class II mRNA nor CIITA mRNA in skin fibroblasts. After treatment with IFN-gamma, we observed a 3- to 28-fold increase in class II mRNA in SFC and an increase of DRB and DPB in skin fibroblasts from undetectable levels to 10(8)-10(9) molecules/microgram total RNA.
authors.affiliation: Institute of Medical Immunology, Martin Luther University, Halle, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Navarrete Santos
authors.forename: D
authors.initials: D
authors.lastname: Riemann
authors.forename: K
authors.initials: K
authors.lastname: Thiele
authors.forename: A
authors.initials: A
authors.lastname: Kehlen
authors.forename: A
authors.initials: A
authors.lastname: Navarrete Santos
authors.forename: J
authors.initials: J
authors.lastname: Langner
mesh_terms: D001172:Arthritis, Rheumatoid / Q000235:genetics / Q000276:immunology*; D002478:Cells, Cultured; D016207:Cytokines / Q000494:pharmacology; D005347:Fibroblasts / Q000166:cytology / Q000276:immunology*; D015870:Gene Expression / Q000187:drug effects; D006682:HLA-DP Antigens / Q000096:biosynthesis / Q000235:genetics; D006683:HLA-DQ Antigens / Q000096:biosynthesis / Q000235:genetics; D059866:HLA-DQ beta-Chains; D006684:HLA-DR Antigens / Q000096:biosynthesis / Q000235:genetics; D000949:Histocompatibility Antigens Class II / Q000096:biosynthesis* / Q000235:genetics; D006801:Humans; D009687:Nuclear Proteins; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis; D013583:Synovial Membrane / Q000166:cytology / Q000276:immunology*; D015534:Trans-Activators / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D016207:Cytokines; D006682:HLA-DP Antigens; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C057615:HLA-DQbeta antigen; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; C083728:MHC class II transactivator protein; D009687:Nuclear Proteins; D012333:RNA, Messenger; D015534:Trans-Activators