Abstract：
:Regulation of matrix metalloproteinase-13 (MMP-13) by collagen matrix in the synovial fibroblasts of rheumatoid arthritis (RA) is critical event in the progressive joint destruction. Our previous study indicated that a collagen receptor, discoidin receptor 2 (DDR2), was highly expressed in the synovial fibroblasts of RA. However, the functional role of DDR2 in the regulation of MMP-13 production in synovial fibroblasts has not been elucidated. In this study, we initially demonstrated that the DDR2 and MMP-13 proteins are both highly expressed in the synovial lining layer of RA. MMP-13 mRNA and protein in synovial fibroblasts of RA were preferentially induced by collagen type II compared with MMP-1. Furthermore, stable overexpression of wild type DDR2 in murine synoviocytes dramatically augments the production of MMP-13. The activation of DDR2 also mediates the up-regulation of MMP-13 promoter activity in 293T cells. Inhibitor specific for extracellular signal-regulated kinase mitogen-activated protein kinase (ERK MAPK) cascade was shown to decrease MMP-13 level induced by collagen II in RA synovial fibroblasts and DDR2-induced MMP-13 promoter activity. Runx2 and activator protein-1 (AP-1) binding sites in MMP-13 promoter region are required for DDR2-induced transcription. The data in this study suggest that DDR2-mediated MMP-13 induction by collagen matrix in synovial fibroblasts of RA contributed to articular cartilage destruction.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Su J,Yu J,Ren T,Zhang W,Zhang Y,Liu X,Sun T,Lu H,Miyazawa K,Yao Ldoi
10.1007/s11010-009-0127-0subject
Has Abstractpub_date
2009-10-01 00:00:00pages
141-52issue
1-2eissn
0300-8177issn
1573-4919journal_volume
330pub_type
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