Abstract
When human articular cartilage is extracted with 2M-guanidinium hydrochloride at pH 7.5, an inhibitor is obtained that blocks the activity of three metalloproteinases, including collagenase. Molecular-sieve chromatography of the inhibitor gives an Mr value for the inhibitor of 28 500. The inhibitor is stable to heat (60 degrees C, 1h) and acid (pH2, 24 degrees C, 10 min). It is destroyed by trypsin and by reduction and alkylation. It is slowly inactivated by aminophenylmercuric acetate. It binds to concanavalin A-Sepharose and is eluted with alpha-D-1-O-methyl glucopyranoside. Complexes of enzyme and inhibitor are not re-activated by aminophenylmercuric acetate and only partially so by high levels of trypsin. These properties indicate that this inhibitor is a member of the TIMP (tissue inhibitor of metalloproteinases) class. Such an inhibitor, previously found in tissue culture and amniotic fluid, is now shown to be directly extractable from tissue.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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