IMR Press / FBL / Volume 4 / Issue 4 / DOI: 10.2741/A388

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article
Degradative enzymes in osteoarthritis
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1 Stanford University School of Medicine, Department of Functional Restoration, Stanford, California 94305-5341, USA
Academic Editor:Charles Malemud
Front. Biosci. (Landmark Ed) 1999, 4(4), 704–712; https://doi.org/10.2741/A388
Published: 15 October 1999
(This article belongs to the Special Issue Fundamental pathways in osteoarthritis)
Abstract

A central feature of the osteoarthritic disease process involves erosive destruction of the articular cartilage extracellular matrix (ECM) on the surfaces of diarthrotic joints. The resultant loss of joint function makes studies on mechanisms underlying ECM degradation critical for treatment of the disease and prevention of disability. Candidate pathways to account for the loss of cartilage involve expression of a combination of proteases that degrade the major cartilage matrix macromolecules, aggrecan and type II collagen. The specific types of enzymatic activities associated with the progressive removal of ECM and severity of joint disease include the matrix metalloproteinases, collagenase, gelatinase and aggrecanase(s). The degradative enzymes originate in synovial cells, cartilage cells, the chondrocytes, distributed within the ECM and leukocytes that actively invade the joint space. Specific enzymes arising from each of these tissues exhibit selective ECM degrading properties; the different categories of these tissue-derived enzymes will be discussed in this chapter. A perspective on the efficacy of existing agents and the potential for development of novel therapeutic agents is also included. While the degradative enzymes serve as a focal point for therapeutic intervention, a fundamental understanding of the mechanisms underlying degradative enzyme expression in osteoarthritis remains an important goal for prevention of disease.

Keywords
Articular cartilage
Osteoarthritis
Extracellular Matrix
Matrix Metalloproteinases
Proteinase Inhibitors
Review
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