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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The role of ADAM-TS4 (aggrecanase-1) and ADAM-TS5 (aggrecanase-2) in a model of cartilage degradation.

INTRODUCTION: Cleavage of aggrecan between residues Glu(373)-Ala(374), which is believed to be a key event in aggrecan destruction in arthritic diseases, has been attributed to an enzymatic activity, aggrecanase. Two cartilage aggrecanases have been identified, aggrecanase-1 (ADAM-TS4) and aggrecanase-2 (ADAM-TS5) and both enzymes have been shown very efficiently to cleave soluble aggrecan at the Glu(373)-Ala(374) site. OBJECTIVE: To determine whether ADAM-TS4 and/or ADAM-TS5 are the aggrecanases responsible for aggrecan catabolism following interleukin-1 ( IL-1) and tumor necrosis factor (TNF) treatment of bovine articular cartilage. RESULTS: (1) IL-1- and TNF- stimulated release of aggrecan was associated with cleavage of aggrecan within the C-terminus at the ADAM-TS4 and ADAM-TS5-sensitive sites, Glu(1480)-Gly(1481), Glu(1667)-Gly(1668), and Glu(1871)-Leu(1872). (2) The order of cleavage following IL-1 stimulation of cartilage explants was the same as when soluble aggrecan is digested with recombinant human ADAM-TS4 and ADAM-TS5. (3) Both constitutive and stimulated cleavage of aggrecan at the ADAM-TS4 and ADAM-TS5-sensitive sites in cartilage was blocked by a general metalloproteinase inhibitor but not by a MMP-specific inhibitor, and this inhibition correlated with inhibition of aggrecan release from cartilage. (4) PCR and Western blot analysis indicated that both ADAM-TS proteases are expressed in cartilage explants; ADAM-TS5 is constitutively expressed whereas ADAM-TS4 is induced following IL-1 and TNF treatment. (5) Immunodepletion of both ADAM-TS4 and ADAM-TS5 from bovine articular cartilage cultures following IL-1 stimulation resulted in a 90% reduction of aggrecanase activity in the culture medium.[1]


  1. The role of ADAM-TS4 (aggrecanase-1) and ADAM-TS5 (aggrecanase-2) in a model of cartilage degradation. Tortorella, M.D., Malfait, A.M., Deccico, C., Arner, E. Osteoarthr. Cartil. (2001) [Pubmed]
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