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An inhibitor of the serine proteinases human leucocyte elastase (EC 3.4.21.37), of cathepsin G (EC 3.4.21.20) and of trypsin (EC 3.4.21.4) has been purified from human articular cartilage. The apparent Mr of the cationic (pI greater than 10) protein was determined to 15,000 by SDS/PAGE. It was shown to cross-react in Western blot with a specific antibody to a recombinant-derived serine-proteinase inhibitor of human mucous secretions. Identity of both inhibitors is indicated by the determination of the N-terminal amino acid sequence of the cartilage-derived serine-proteinase inhibitor. In all 24 residues the cartilage inhibitor was shown to be identical with the human secretory leucocyte proteinase inhibitor ('SLPI'). The inhibitor molecule may play a crucial role in the protection of cartilage matrix proteins against proteolytic attack.

Purification of a serine-proteinase inhibitor from human articular cartilage. Identity with the acid-stable proteinase inhibitor of mucous secretions