GDF-5 is suppressed by IL-1β and enhances TGF-β3-mediated chondrogenic differentiation in human rheumatoid fibroblast-like synoviocytes

被引:15
作者
Liu, Fei-Lan [2 ]
Lin, Li-Hsiang [1 ]
Sytwu, Huey-Kang [3 ]
Chang, Deh-Ming [1 ]
机构
[1] Natl Def Med Ctr, Triserv Gen Hosp, Taipei, Taiwan
[2] Natl Def Med Ctr, Grad Inst Med Sci, Taipei, Taiwan
[3] Natl Def Med Ctr, Grad Inst Life Sci, Taipei, Taiwan
关键词
Growth differentiation factor-5; Chondrocyte; Interleukin-1; Transforming growth factor-b; MESENCHYMAL STEM-CELLS; ACTIVATED PROTEIN-KINASE; SYNOVIAL FIBROBLASTS; MORPHOGENETIC PROTEIN-1; BONE-MARROW; IN-VITRO; GROWTH/DIFFERENTIATION FACTOR-5; OSTEOGENIC PROTEIN-1; SKELETAL DEVELOPMENT; ARTICULAR-CARTILAGE;
D O I
10.1016/j.yexmp.2009.09.019
中图分类号
R36 [病理学];
学科分类号
100104 ;
摘要
Objective: To investigate the expression of growth differentiation factor-5 (GDF-5) in chondrocytes (HC) and fibroblast-like synoviocytes (FLS) from humans with rheumatoid arthritis (RA) when stimulated with proinflammatory cytokines and to explore whether GDF-5 plays a role in regulating the differentiation of FLS-RA into chondrocytes. Methods: Expression of GDF-5 in synovium and cartilage in RA and osteoarthritis (OA) was assessed by immunohistochemistry. GDF-5 production in FLS-RA and HC-RA was examined through real-time quantitative RT-PCR (Q-PCR) and western blotting. Expressions of GDF-associated receptors on FLS-RA were determined by semiquantitative-PCR, and MTT assay was used to study the effects on FLS-RA proliferation. Effect of GDF-5 and TGF-beta 3 on in vitro chondrogenic ability of FLS-RA was investigated using pellet-culture system, Q-PCR and histological analysis. Results: Immunohistochemical analysis demonstrated that GDF-5 expression in the synovium and cartilage from joints of RA patients was much lower than that of OA patients. Addition of IL-1 beta or TNF-alpha appeared to downregulate the expression of GDF-5 in HC-RA and FLS-RA. Inhibition of GDF-5 expression by IL-1 beta in RA-FLS was attenuated by pretreatment with MEK1/2 inhibitor. GDF-5-associated receptors were expressed in FLS-RA, but GDF-5 had no effect on FLS-RA proliferation. GDF-5 had a strong chondrogenic-promoting effect on TGF-beta 3-induced chondrocyte differentiation in FLS-RA. Conclusions: GDF-5 is expressed in FLS-RA and HC-RA, and its expression is strongly downregulated by proinflammatory cytokines. MEK-ERK pathway is a negative regulator of GDF-5 expression in FLS-RA. In FLS-RA, synergy between GDF-5 and TGF-beta 3 enhances chondrogenesis. Anti-inflammatory drugs combined with GDF-5 might be a new therapeutic treatment for RA. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码:163 / 170
页数:8
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