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Aggrecanases and cartilage matrix degradation
Hideaki Nagase1, Masahide Kashiwagi
1The Kennedy Institute of Rheumatology Division, Faculty of Medicine, Imperial College London, London, UK. h.nagase@imperial.ac.uk
Arthritis Research & Therapy
|April 30, 2003
Summary
Aggrecanases, like ADAMTS-4 and ADAMTS-5, are key enzymes in early arthritis that degrade cartilage. This review details their function and regulation compared to matrix metalloproteinases.
Area of Science:
- Biochemistry
- Molecular Biology
- Rheumatology
Background:
- Cartilage degradation impairs joint function, particularly in rheumatoid arthritis and osteoarthritis.
- Aggrecanases, a type of metalloproteinase, cleave the aggrecan core protein at the Glu373-Ala374 bond, initiating cartilage destruction.
- ADAMTS-1, ADAMTS-4, and ADAMTS-5 are identified aggrecanases involved in this process.
Purpose of the Study:
- To review the enzymatic properties of the three known aggrecanases.
- To discuss the regulation of aggrecanase activities.
- To examine the role of aggrecanases in cartilage matrix breakdown during arthritis, contrasting their action with matrix metalloproteinases.
Main Methods:
- Review of existing literature on aggrecanases and matrix metalloproteinases.
- Analysis of enzymatic properties and regulatory mechanisms.
- Comparison of cleavage sites and roles in arthritic conditions.
Main Results:
- ADAMTS-1, ADAMTS-4, and ADAMTS-5 are confirmed aggrecanases.
- Aggrecanases cleave aggrecan at the Glu373-Ala374 bond.
- Matrix metalloproteinases cleave aggrecan at a different site (Asn341-Phe342).
Conclusions:
- Aggrecanases play a critical role in the early stages of cartilage destruction in arthritis.
- Understanding aggrecanase regulation is crucial for developing therapeutic strategies.
- Differentiating aggrecanase and matrix metalloproteinase activity is important for comprehending cartilage breakdown in arthritic diseases.