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Matrix metalloproteinases: role in arthritis.
Peter S Burrage1, Kimberlee S Mix, Constance E Brinckerhoff
1Department of Biochemistry, Dartmouth Medical School, Dartmouth Hitchcock Medical Center, Lebanon, NH 03756, USA.
Frontiers in Bioscience : a Journal and Virtual Library
|September 9, 2005
Summary
Rheumatoid arthritis (RA) and osteoarthritis (OA) cause joint destruction by stimulating matrix metalloproteinases (MMPs). Targeting MMPs offers potential therapeutic strategies for arthritis, but effective inhibitors are still lacking.
Area of Science:
- Biochemistry
- Immunology
- Orthopedics
Background:
- Rheumatoid arthritis (RA) and osteoarthritis (OA) are debilitating joint diseases characterized by the irreversible destruction of cartilage, tendon, and bone.
- Both conditions involve the dysregulation of extracellular matrix components and inflammatory processes within the synovial joints.
Purpose of the Study:
- To elucidate the roles of matrix metalloproteinases (MMPs) in the pathogenesis of RA and OA.
- To explore potential therapeutic strategies targeting MMPs for the prevention of joint destruction in arthritis.
Main Methods:
- The study reviews the molecular mechanisms underlying cartilage, tendon, and bone degradation in arthritis.
- It focuses on the specific roles of collagenases (MMP-1 and MMP-13) and other MMPs in extracellular matrix breakdown.
- The research examines the signaling pathways controlling MMP gene expression.
Main Results:
- Matrix metalloproteinases (MMPs), particularly collagenases MMP-1 and MMP-13, are key enzymes driving connective tissue destruction in both RA and OA.
- MMP-13 exhibits a dual role by degrading both collagen and aggrecan, a proteoglycan.
- Elevated expression of other MMPs (MMP-2, MMP-3, MMP-9) further contributes to matrix degradation.
Conclusions:
- Despite significant efforts, effective clinical inhibitors for MMPs in arthritis remain elusive.
- Further understanding of MMP crystal structures, signal transduction, and gene regulation is crucial for developing novel therapeutics to combat joint destruction.