Abstract
Post-confluent cultures of cloned rabbit odontoblast-like cells (RP: R abbit P ulp cells) produced latent collagenase, which was isolated from serum-containing culture media by heparin-Sepharose affinity chromatography. RP collagenase was purified 4,420-fold from serum-containing medium to a specific activity of 1,313 units/mg with a yield of 14% by heparin-Sepharose affinity chromatography, carboxymethyl-cellulose ion-exchange chromatography, and by immunoadsorption chromatography. The RP cell culture appears to be a suitable model to use for studying collagenase synthesis in mineralized tissue-forming cells and for elucidating the mechanism of collagen degradation in pulp tissue and dentin matrix.
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