title: Increased expression of pro-inflammatory cytokines and metalloproteinase-1 by TGF-beta1 in synovial fibroblasts from rheumatoid arthritis and normal individuals.
abstract: Transforming growth factor (TGF)-beta1 is expressed abundantly in the rheumatoid synovium. In this study, the inflammatory effect of TGF-beta1 in rheumatoid arthritis (RA) was investigated using cultured fibroblast-like synoviocytes (FLS) from RA and osteoarthritis (OA) patients, as well as non-arthritic individuals. mRNA expressions of IL-1beta, tumour necrosis factor (TNF)-alpha, IL-8, macrophage inflammatory protein (MIP)-1alpha and metalloproteinase (MMP)-1 were increased in RA and OA FLS by TGF-beta1 treatment, but not in non-arthritic FLS. Enhanced protein expression of IL-1beta, IL-8 and MMP-1 was also observed in RA FLS. Moreover, TGF-beta1 showed a synergistic effect in increasing protein expression of IL-1beta and matrix metalloproteinase (MMP)-1 with TNFalpha and IL-1beta, respectively. Biological activity of IL-1 determined by mouse thymocyte proliferation assay was also enhanced by 50% in response to TGF-beta1 in the culture supernatant of RA FLS. DNA binding activities of nuclear factor (NF)-kappaB and activator protein (AP)-1 were shown to increase by TGF-beta1 as well. These results suggest that TGF-beta1 contributes for the progression of inflammation and joint destruction in RA, and this effect is specific for the arthritic synovial fibroblasts.
authors.affiliation: Department of Biochemistry, Korea University College of Medicine, Sungbuk-Gu, Seoul.
authors.forename: H
authors.initials: H
authors.lastname: Cheon
authors.forename: S-J
authors.initials: SJ
authors.lastname: Yu
authors.forename: D H
authors.initials: DH
authors.lastname: Yoo
authors.forename: I J
authors.initials: IJ
authors.lastname: Chae
authors.forename: G G
authors.initials: GG
authors.lastname: Song
authors.forename: J
authors.initials: J
authors.lastname: Sohn
mesh_terms: D001172:Arthritis, Rheumatoid / Q000201:enzymology / Q000276:immunology*; D002478:Cells, Cultured; D054405:Chemokine CCL3; D054407:Chemokine CCL4; D016207:Cytokines / Q000096:biosynthesis* / Q000235:genetics; D005347:Fibroblasts / Q000187:drug effects / Q000201:enzymology / Q000276:immunology*; D006801:Humans; D007375:Interleukin-1 / Q000096:biosynthesis / Q000235:genetics; D016209:Interleukin-8 / Q000096:biosynthesis / Q000235:genetics; D019402:Macrophage Inflammatory Proteins / Q000096:biosynthesis / Q000235:genetics; D020781:Matrix Metalloproteinase 1 / Q000096:biosynthesis* / Q000235:genetics; D016328:NF-kappa B / Q000378:metabolism; D010003:Osteoarthritis / Q000276:immunology; D012333:RNA, Messenger / Q000096:biosynthesis; D013583:Synovial Membrane / Q000166:cytology / Q000201:enzymology / Q000276:immunology*; D018808:Transcription Factor AP-1 / Q000378:metabolism; D015533:Transcriptional Activation; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D053773:Transforming Growth Factor beta1; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis / Q000235:genetics
chemical_list: D054405:Chemokine CCL3; D054407:Chemokine CCL4; D016207:Cytokines; D007375:Interleukin-1; D016209:Interleukin-8; D019402:Macrophage Inflammatory Proteins; D016328:NF-kappa B; D012333:RNA, Messenger; C508960:TGFB1 protein, human; C508961:Tgfb1 protein, mouse; D018808:Transcription Factor AP-1; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D014409:Tumor Necrosis Factor-alpha; D020781:Matrix Metalloproteinase 1