EFFECTS OF LIPID PEROXIDE ON PRODUCTION OF MATRIX METALLOPROTEINASE-1 (TISSUE COLLAGENASE) AND METALLOPROTEINASE-3 (STROMELYSIN) AND TISSUE INHIBITOR METALLOPROTEINASE-1 BY HUMAN RHEUMATOID SYNOVIAL FIBROBLASTS

The effects of linoleic acid hydroperoxide on the production of matrix metalloproteinases (MMPs) including MMP-1 (tissue collagenase), -2 (''type IV collagenase''), and -3 (stromelysin) and of tissue inhibitor of metalloproteinase 1 (TIMP-1), as well as DNA synthesis were investigated in rheumatoid synovial fibroblasts. Our results demonstrated that the levels of proMMP-1 and -3 and TIMP-1 were extremely elevated when 0.5-2.0 nmole/ml of linoleic acid hydroperoxide was added to cultures of rheumatoid synovial fibroblasts. DNA synthesis, however, was inhibited by linoleic acid hydroperoxide. These results indicate that lipid peroxide causes the disruption of extracellular matrix macromolecules and the inhibition of cell repair in synovial tissue. Therefore, they also suggest that an elevated level of oxygen free radical and/or lipid peroxides in synovial fluid may play an important role in the process of rheumatoid arthritis, resulting in the disruption of the joint. (C) 1993 Academic Press, Inc.