Abstract
Cultured tissue slices from normal immature rabbit articular cartilage released latent neutral metalloproteinases into serum-free medium. On activation with 4-aminophenylmercuric acetate, these metalloproteinases could degrade collagen, proteoglycan, and gelatin. Also produced were an acid proteinase with the properties of cathepsin D and an inhibitor of the neutral metalloproteinases. The appearance of both the proteinases and the inhibitor in the culture medium could be prevented by incubation of cultures with cycloheximide. The active and latent forms of the proteinases were characterized using Ultrogel AcA 54 chromatography.
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