J Korean Rheum Assoc.  2003 Jun;10(2):141-150.

Regulation of Matrix Metalloproteinases and Tissue Inhibitor of Metalloproteinase-1 Expression by Hypoxia in Rheumatoid and Osteoarthritis Fibroblast-Like Synoviocytes

• Cha HS
• Jeon CH
• Choi HJ
• Ahn KS
• Song YW
• Koh EM

Abstract

OBJECTIVE
The rheumatoid synovium is a hypoxic environment and hypoxia has been implicated to have a role in the pathogenesis of rheumatoid arthritis (RA). In this work, we tried to investigate the effect of hypoxia on the expression of matrix metalloproteinase (MMP)-1, -3 and tissue inhibitor of metalloproteinase (TIMP)-1 in rheumatoid and osteoarthritis (OA) fibroblast-like synoviocytes (FLS).
METHODS
FLS obtained from RA and OA patients were cultured under normoxic or hypoxic condition for 48 hours. Western blot analyses for MMP-1, -3 and TIMP-1 were performed. TIMP-1 mRNA levels were measured by Northern blot analysis.
RESULTS
Hypoxia increased MMP-1 expression in rheumatoid FLS compared with normoxia. TIMP-1 expression was decreased by hypoxia in rheumatoid FLS in both protein and mRNA levels. On the other hand, hypoxia did not significantly affect MMP-1, -3 and TIMP-1 expressions in OA FLS.
CONCLUSION
These results suggest that microenvironment such as hypoxia may directly contribute to joint destruction in RA by increasing the ratio of MMP-1 to TIMP-1 production in FLS.

Keyword

Hypoxia; Rheumatoid arthritis; Matrix metalloproteinase; Tissue inhibitor of metalloproteinase

MeSH Terms

Anoxia*
Arthritis, Rheumatoid
Blotting, Northern
Blotting, Western
Hand
Humans
Joints
Matrix Metalloproteinases*
Osteoarthritis*
RNA, Messenger
Synovial Membrane
Tissue Inhibitor of Metalloproteinase-1*
Matrix Metalloproteinases
RNA, Messenger
Tissue Inhibitor of Metalloproteinase-1